CN115808366A - A device for locating the impact point and measuring the depth of damage in the R zone of composite materials - Google Patents

Abstract

The invention belongs to the field of impact damage introduction and test of composite material structures of airplanes, and particularly relates to an R region impact damage introduction test and damage depth measuring device. A groove is arranged on a base of the impact point positioning and damage depth measuring device, at least one threaded hole is arranged on the side wall of the groove, and an adjusting bolt is arranged in the threaded hole; a bracket is arranged on the base; the support is provided with a support arm which can move up and down along the support, and the support arm is provided with a dial indicator; the supporting plate is arranged in the groove, and the free end of the screw rod of the adjusting bolt is abutted against the supporting plate so as to fix the supporting plate; the test piece fixing part is used for fixing two ends of the test piece, the test piece fixing part is arranged on the supporting plate, and the dial indicator is over against the R area of the test piece. The invention determines the position of the impact point and measures the impact damage pit through the dial indicator, has very simple structure and very convenient operation.

Description

A device for locating the impact point and measuring the depth of damage in the R zone of composite materials

technical field

The invention belongs to the field of impact damage introduction and testing of aircraft composite material structures, and in particular relates to an R-zone impact damage introduction test and damage depth measuring device.

Background technique

The R zone is a typical structural feature of beams and ribs in composite material structures. When the R zone structure is subjected to out-of-plane compression and bending, a large interlayer stress will be generated between layers, and the interlayer strength of composite laminates is very low. Low, resulting in easy delamination damage in the R zone. Due to the brittleness of the polymer resin, the structure will be damaged by delamination or fiber breakage under the action of heavy objects falling or knocking in the actual use environment. Therefore, the determination of damage resistance is often required in the performance evaluation of composite structures. For composite R-zone structures, impact damage will seriously affect the remaining load-carrying capacity of the R-zone.

At present, for the impact damage introduction test of composite laminates, the main test standards at home and abroad are only applicable to the impact damage introduction test of straight composite laminates, and there is no impact test standard for curved surfaces including the R zone. At the same time, since the inner and outer surfaces of the R zone are arc surfaces, the measurement method of the flat test piece cannot be used to measure the depth of the damage pit after impact. Therefore, it is urgent to design the R-zone impact damage introduction method flow and damage depth measurement method to solve the increasing test requirements for R-zone structural test pieces in engineering design applications.

Contents of the invention

The object of the present invention is to provide a device for locating the impact point and measuring the damage depth in the R zone of composite materials, so as to solve the technical requirements of the R zone impact test process and the measurement problem of the damage depth.

The purpose of the present invention is achieved through the following technical solutions.

A device for locating the impact point and measuring the depth of damage in the R zone of composite materials, including a base, a bracket, a support arm, a support plate and a test piece fixture, a groove is arranged on the base, and a side wall of the groove is provided At least one threaded hole is provided on the top, and an adjusting bolt is provided in the threaded hole; a bracket is provided on the base; an arm is provided on the support, and the support arm can move up and down along the support. A dial indicator is provided on the support arm; the support plate is arranged in the groove, and the free end of the screw rod of the adjusting bolt abuts against the support plate, so as to fix the support plate; The test piece fixing part is used to fix the two ends of the test piece, the test piece fixing part is arranged on the support plate, and the dial gauge is facing the R zone of the test piece; and it is configured to: In the first state, the dial gauge is facing the first area of the R zone of the test piece; in the second state, the dial gauge is facing the second area of the R zone of the test piece; The dial indicator and the test piece can be displaced along the X-axis direction and the Y-axis direction, the X-axis direction and the X-axis direction are directions perpendicular to the longitudinal axis direction of the R zone, and the Y-axis direction is A direction parallel to the direction of the longitudinal axis of the R zone.

In the above-mentioned device for locating the impact point and measuring the depth of damage in the R zone of the composite material, a first track is provided on the bracket, and the support arm can move along the first track to realize that the dial gauge is moved along the X-axis. directional movement;

In the above-mentioned device for locating the impact point and measuring the depth of damage in the R zone of the composite material, a second track is provided on the base, and the lower end of the bracket can move on the second track to realize that the dial gauge moves along the Movement in the Y-axis direction.

The device for locating the impact point and measuring the depth of damage in the R zone of the composite material also includes a first motor and a second motor, the first motor is used to drive the arm to move along the X-axis direction; the first motor is used to drive The support moves along the Y-axis direction.

In the above device for locating the impact point and measuring the depth of damage in the R zone of the composite material, when the adjusting bolt is in a loose state, the support plate can move along the X-axis direction;

In the above-mentioned device for locating the impact point and measuring the depth of damage in the R zone of the composite material, a slide groove is provided on the support plate, the direction of the slide groove is the Y-axis direction, and a through-hole is provided on the test piece fixture. A hole is provided in the through hole, and a fixing bolt is arranged in the through hole, and the fixing bolt passes through the through hole and the sliding groove, so as to realize adjusting and fixing the position of the fixing part of the test piece.

In the above-mentioned device for locating the impact point and measuring the depth of damage in the R zone of the composite material, the fixture of the test piece includes a first fixture and a second fixture, and the first fixture is used to fix the first side of the test piece , the second fixing member is used to fix the second side of the test piece, wherein: the first fixing member includes two oppositely arranged plates, and a connecting portion connecting the two plates, and the first side is set Between the two plates, at least one threaded hole is provided on one of the plates, and a bolt is provided in the threaded hole, and the bolt can abut against the first edge in a tightened state to realize the second Fixing on one side; the second fixing member includes two opposite plates, and a connecting portion connecting the two plates, the second side is arranged between the two plates, and at least one plate is provided on one of the plates A threaded hole, in which a bolt is arranged, and the bolt can abut against the second side in a tightened state, so as to realize the fixing of the second side.

In the above device for locating the impact point and measuring the depth of damage in the R zone of the composite material, the test piece includes a first side and a second side, the connection between the first side and the second side is the R zone, and the first side The angle formed by one side and the second side is 60°-120°, the angle of the first fixing part matches the angle of the first side, and the angle of the second fixing part matches the angle of the first side. The angles of the two sides match.

Preferably, the angle formed by the first side and the second side is 90°±2°.

In the above device for locating the impact point and measuring the depth of damage in the R zone of the composite material, the fixture for the test piece further includes a first constraint and a second constraint, and the first constraint is perpendicular to the first edge of the test piece , the second constraint is perpendicular to the second edge, the first constraint provides vertical pressure to the first edge when it abuts against the first edge, and the second constraint is at When abutting against the second side, a vertical pressure is provided to the second side.

In the above device for locating the impact point and measuring the depth of damage in the R zone of the composite material, the first restraint includes a handle and a rubber indenter, and the rubber indenter of the first restraint is against the first side;

In the above device for locating the impact point and measuring the damage depth in the R zone of the composite material, the second restraint includes a handle and a rubber indenter, and the rubber indenter of the second restraint is against the second edge.

In the above device for locating the impact point and measuring the damage depth of the R zone of the composite material, the length of the R zone of the test piece is L, and the first area of the R zone is 1/10L to 1/4L from the first edge of the R zone distance, the second area of the R zone is an area 1/10L to 1/4L away from the second edge of the R zone.

The above-mentioned device for locating the impact point and measuring the depth of damage in the R zone of the composite material includes two methods for locating the impact point and measuring the depth of damage, wherein the method for locating the use state of the impact point includes the following steps:

Step 1.1, contacting the first area of the R zone of the test piece with the dial gauge;

In step 1.2, the test piece and the dial indicator are displaced in the X-axis direction, the X-axis direction is perpendicular to the longitudinal axis of the R zone, and the point with the smallest reading of the dial gauge during the movement is marked as A point;

Step 1.3, displacing the test piece and the dial gauge in the Y-axis direction, the Y-axis direction being parallel to the longitudinal axis of the R zone, making the second zone of the R zone contact the dial gauge, The test piece is moved in the direction opposite to the X-axis direction, and the point with the smallest reading of the dial gauge during the movement is marked as point B;

Step 1.4, after connecting the points A and B, extend to a line segment formed by the entire length of the R area, and the midpoint of the line segment is the impact point;

The method for measuring the depth of damage comprises the steps of:

Step 2.1, directing the dial gauge to point A of the test piece;

Step 2.2, the test piece and the dial gauge are displaced so that the dial gauge is from point A to point B, and the maximum value of the dial gauge during this process is recorded as S1;

Step 2.3, displacing the test piece and the dial gauge in the opposite direction, so that the dial gauge moves from facing point B to facing point A, and recording the maximum value of the dial gauge during this process as S2;

Step 2.4, the impact damage depth value is the average value of S1 and S2

By virtue of the above technical solutions, the present invention has at least the following advantages:

1) The present invention provides a kind of impact point positioning and damage depth measuring device in the composite material R zone aimed at the structural characteristics of the test piece in the R zone of the composite material. Measurement of damage pit depth;

2) The present invention uses a dial indicator to determine the position of the impact point and measure the impact damage pit, which has a very simple structure and is also very convenient to operate;

3) The test piece fixing part of the present invention can realize the fixing of the test piece through the joint action of the first fixing part and the second fixing part, and satisfies the requirement of the restraint method for the impact test piece.

4) The test piece fixture of the present invention can prevent the test piece from moving along the vertical direction of the straight edge during the impact process through the first constraint piece and the second constraint piece.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention and accompanying drawings are described in detail below.

Description of drawings

Fig. 1 is the structural representation of the location of the impact point and the damage depth measuring device in the composite material R zone of the present invention;

Fig. 2 is the structural representation of test piece of the present invention;

Fig. 3 is the structural representation of the first track of the present invention;

Figure 4 is a partial sectional view of the first track of the present invention;

Fig. 5 is another structural representation of the first track of the present invention;

Fig. 6 is the structural representation of the second track of the present invention;

Fig. 7 is a physical diagram of the installation of the test piece and the test piece fixture of the present invention.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the application according to the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. .

The device for locating the impact point and measuring the damage depth of the composite material R zone as shown in Figure 1-6 includes a base 1, a bracket 2, an arm 3, a support plate 4 and a test piece fixing part, and a concave hole is arranged on the base 1. Groove 10, be provided with at least one threaded hole on the side wall of described groove 10, be provided with adjusting bolt 100 in described threaded hole; Be provided with a support 2 on described base 1; An arm 3 is arranged, and the arm 3 can move up and down along the support 2, and a dial indicator 6 is arranged on the arm 3; the support plate 4 is arranged in the groove 10, and the adjustment The free end of the screw of the bolt 100 leans against the support plate 4 to fix the support plate 4; the test piece fixture is used to fix both ends of the test piece, and the test piece fixture is arranged on the On the support plate 4, the dial gauge 6 is facing the R zone of the test piece; and configured to: in the first state, the dial gauge 6 is facing the first part of the R zone of the test piece Area; when in the second state, the dial gauge 6 is facing the second area of the R zone of the test piece; the dial gauge 6 and the test piece can occur along the X-axis direction and the Y-axis direction Displacement, the X-axis direction and the X-axis direction is a direction perpendicular to the longitudinal axis direction of the R zone, and the Y-axis direction is a direction parallel to the longitudinal axis direction of the R zone.

The present invention determines the impact position of the test piece in the R zone through the dial gauge 6. Since the impact in the R zone needs to be impacted at the apex of the arc in the R zone, the present invention selects the midpoint of the double vertices as the impact point. The present invention first is to select the weakest position of the test piece as the impact point, because the weakest position is more prone to damages such as delamination or fiber breakage, the test piece that meets the requirements of the damage depth value also needs to carry out follow-up mechanical performance tests (such as residual strength test), so the impact damage depth value obtained by the method of the present invention meets the requirements of the aviation field for impact damage. Due to the characteristics of the test piece in the R zone, the apex of the test piece in the R zone is the weakest position of the test piece. The midpoint of the double vertex is used as the impact point, so that the most vertex of the R zone of the conforming material can be found, and the impact point is determined by the midpoint of the double vertex, which is a secondary confirmation of the vertex of the R zone. The apex confirmation error caused by the test piece itself (such as local protrusion or depression), on the other hand, is to avoid the influence of delamination damage when measuring the depth of the pit.

By two areas (i.e. the first area and the second area) in the width direction of the R area, use the dial gauge 6 to move around the R area to find the lowest point of value, and locate the apex position of the R area as the impact position point; the present invention Considering the structural characteristics of the test piece in the R area, since the R area is a coherent arc-shaped area, by finding the vertices of the first area and the second area, the range of the area where the vertices are located can basically be determined. The device for determining the impact point through the dial gauge 6 of the present invention has a very simple structure and is very convenient to operate.

The dial gauge 6 is arranged perpendicular to the R zone, the length of the R zone is L (generally 80-150 mm), and the first area of the R zone is 1/10-1 mm away from the first edge of the R zone. The area with a distance of /4L, the second area of the R zone is an area with a distance of 1/10 to 1/4L from the second edge of the R zone.

If the width of the test piece is 150 mm (that is, the length of the R zone is 150 mm) as an example, the specific positions of the first area and the second area will be further described. The first area is 15 mm to 37.5 mm away from the first edge of the test piece, and the second area is 15 mm to 37.5 mm away from the second edge of the test piece.

Since the depth of the pit at the point of impact is a relative concept, that is, the value of the pit with the initial undamaged vertex as the reference. According to the test data that has been carried out, in addition to pits at the impact point, there will also be delamination damage, and the delamination damage will expand along the width of the test piece. The extended range will reach 1/4L from the edge at the farthest. Due to the layered expansion, the initial state of the vertex of the test piece is changed, which is not suitable as a reference point for the measurement of the pit, and the edge of the test piece is also not suitable as a reference point, so the first area of the R area is the first distance from the R area. An area at a distance of 1/10 to 1/4L from the edge, the second area of the R zone is an area at a distance of 1/10 to 1/4L from the second edge of the R zone.

When the present invention specifically realizes the specific scheme that "the dial indicator 6 and the test piece can be displaced along the X-axis direction and the Y-axis direction", two implementation schemes are specifically designed:

The first option:

The movement of the support 2 and the support arm 3 drives the dial indicator 6 to move, so that the displacement of the dial indicator 6 and the test piece along the X-axis direction and the Y-axis direction can be realized. Specifically, a first rail 7 is provided on the support 2, and the support arm 3 can move along the first rail 7 to realize the direction of the dial gauge 6 along the X-axis direction and the opposite direction of the X-axis direction. Movement; the base 1 is provided with a second rail 8, and the lower end of the bracket 2 can move on the second rail 8, so as to realize the reverse movement of the dial gauge 6 along the Y-axis direction and the Y-axis direction. direction movement.

In this embodiment, as shown in FIG. 3 and FIG. 4 , the specific form of the first track 7 can be in the form of a limit ring 70 , in this way the support arm 3 is arranged on the limit ring 70 Among them, a threaded through hole is provided on the limit ring 70, and a limit bolt 71 is arranged in the threaded through hole, and the limit bolt 71 vertically abuts against the side of the support arm 3. When the limit bolt 71 abuts on the support arm 3, the position of the support arm 3 is fixed; when the limit bolt 71 does not abut on the support arm 3, the support arm 3 3 can move back and forth. In order to realize the movement of the dial indicator 6 in the first area of the test piece to find the first vertex during the process of finding the vertex, and the movement of the dial indicator 6 in the second area of the test piece movement to find the second vertex.

As a variable embodiment, as shown in FIG. 5 , the specific form of the first track 7 can also be in the form of a threaded stop ring 72, and the threaded stop ring 72 includes an internal thread portion 722 and an assembly base 721 , the internal thread part 722 can rotate on the assembly base 721, and a bar-shaped groove is provided on the base 1, and the internal thread part 722 is rotatably matched with one end of the support arm 3. There is a protrusion on the arm 3, and the protrusion slides in the bar-shaped groove, so that when the internal thread part 722 rotates, the front and rear movement of the internal thread part 722 can push the support arm 3 moves back and forth (due to the action of the strip-shaped groove and the protrusion, the support arm 3 only moves in a straight line), in this way, in order to realize the impact point positioning and damage of the R zone of the composite material shown The electric operation mode of the depth measuring device, the impact point positioning and damage depth measuring device of the composite material R zone also includes a first motor, the first motor is electrically connected to the internal thread part 722, and the first motor is used for The inner threaded part 722 is driven to rotate, so that the support arm 3 moves along the X-axis direction (linear movement).

In this embodiment, the second track 8 is a linear track, and the second track 8 is specifically a groove 10 track. The cross section of the track on the base 1 is shown in FIG. 6 . The lower end of the bracket 2 is provided with a sliding protrusion 80 matching the track of the groove 10 , the sliding protrusion 80 can slide in the track of the groove 10 and can keep the bracket 2 in a vertical state all the time. When the support 2 slides, the dial gauge 6 can be moved from the first area of the test piece to the second area, or from the second area to the first area. In order to realize the electric operation mode of the device for locating the impact point and measuring the depth of damage in the R zone of the composite material, the device for locating the impact point and measuring the depth of damage in the R zone of the composite material also includes a second motor, and the first motor is used to drive the device. The support 2 moves along the Y-axis direction.

The second option:

Through the movement of the support plate 4 , the dial indicator 6 and the test piece can be displaced along the X-axis direction and the Y-axis direction. The groove 10 on the base 1 is used as the sliding groove 40 of the support plate 4. When the adjusting bolt 100 is in a loose state, the support plate 4 can move along the X in the groove 10 on the base 1. Axial direction (comprising X direction and opposite direction of X direction two directions); On described support plate 4, be provided with sliding groove 40, the direction that described sliding groove 40 lays is Y axis direction, fixed on the described test piece A through hole is provided on the test piece, and a fixing bolt is arranged in the through hole, and the fixing bolt passes through the through hole and the sliding groove 40, so as to adjust and fix the position of the fixing piece of the test piece. When the fixing bolts are in a loose state, the test piece fixture drives the test piece to move in the Y-axis direction (including the Y direction and the opposite direction to the Y direction).

The fixed part of the test piece is fixed with the base 1 by fixing bolts, which can facilitate the movement of the test piece on the one hand, and facilitate the replacement of the fixed part of the test piece on the other hand.

In the above-mentioned specific embodiments, regardless of the first scheme or the second scheme, the relative displacement between the dial gauge 6 and the test piece can be realized, so that the dial gauge 6 can be used to measure the apex of the R zone. The use state method for locating the impact point comprises the following steps: step 1.1, contacting the first area of the R zone of the test piece with the dial gauge 6; direction, the X-axis direction is perpendicular to the longitudinal axis of the R zone, and the point where the dial gauge 6 readings are the smallest in the moving process is marked as point A; step 1.3, make the test piece and the dial gauge 6 Displacement in the direction of the Y axis, the direction of the Y axis being parallel to the longitudinal axis of the R zone, making the second zone of the R zone contact the dial gauge 6, and the test piece is reversed along the X axis direction In the moving process, the point with the smallest reading of the dial gauge 6 is marked as point B; step 1.4, after connecting the point A and point B, extend to the line segment formed by the length of the entire R area, so The midpoint of the line segment is the point of impact. In specific implementation, the test piece can be moved to one side close to the side position under the dial gauge 6 by manually moving the support plate 4, and the dial gauge 6 is in contact with the R zone, and adjusted by rotating the R zone. The bolt 100 moves the test piece back and forth, so that the constantly changing value is displayed on the dial gauge 6, and the apex of the R area is found to be marked as point A; the other side of the test piece is manually moved to the lower side of the dial gauge 6, and the Dial gauge 6 is in contact with area R, and the test piece is moved back and forth by turning the positioning adjustment bolt 100 of area R, so that the constantly changing value is displayed on dial indicator 6, and the apex of area R is found to be marked as point A; The line connecting the two points extends to the entire width of the test piece, and the point in the middle of the width on the line AB is the impact point. The impact point can also be found by driving the first motor and the second motor through a computer program so that the support 2 and the support arm 3 move, thereby driving the movement of the dial indicator 6 .

After the impact point of the test piece is found, an impact test machine can be used to perform the impact test. The support base of the present invention is very convenient to disassemble, so when performing the impact test, the support base and the test piece can be put into the impact testing machine together. In the present invention, the test piece is installed to the support base through the test piece fixing piece, and the deformation of the test piece along the straight edge direction during impact is constrained by the test piece fixing piece. Further, the base 1 can also be provided with There is a groove 10 matching the external dimensions of the test piece, and the bottom plane of the groove 10 is in contact with the test piece to abut against the test piece, further providing a constraint force on the test piece. Put the test piece, the test piece fixture and the support base together into a standard impact testing machine, place the testing machine at the point of impact just below the punch of the standard drop weight impact testing machine, and the support base is fixed on the standard impact test machine. On the base 1 of the machine, release the drop hammer to impact the test piece to complete the damage introduction of the test piece.

After performing the impact test, the device for positioning the impact point and measuring the depth of damage in the R zone of the composite material of the present invention can also measure the depth of damage to the test piece, and the specific steps of the depth of damage measurement are: step 2.1, the thousandth Table 6 is facing the point A of the test piece; step 2.2, the test piece and the dial gauge 6 are displaced so that the dial gauge 6 is from facing the point A to facing the B point, record the maximum value of the dial indicator 6 in this process as S1; Step 2.3, the test piece and the dial indicator 6 are displaced in the opposite direction, so that the dial indicator 6 is from facing point B to Facing point A, record the maximum value of the dial indicator 6 during this process as S2; step 2.4, the impact damage depth value is the average value of S1 and S2. During specific implementation, the test piece after the impact test, the test piece fixture, and the support seat are taken out together, and then the test piece, the test piece fixture, and the support seat are put into the impact point of the composite material R zone for positioning and In the damage depth measuring device, the support seat is placed in the groove 10 of the base 1, and the support seat can be manually pushed so that the thimble of the dial indicator 6 is on the test piece along the path that coincides with the line AB Move, move from point A to point B, record the maximum value S1 of dial gauge 6 during the movement process; then push the support seat to make the thimble of dial gauge 6 move on the test piece along the path that coincides with the line connecting point AB , move from point B to point A, and record the maximum value S2 of dial indicator 6 during the movement process. The average value of S1 and S2 is the impact damage depth value. Certainly, it is also possible to drive the first motor and the second motor to run through a computer program, so that the support 2 and the support arm 3 are moved, thereby driving the movement of the dial gauge 6 to measure the damage depth of the test piece .

Furthermore, in order to realize the restraint capability of the test piece, this embodiment further designs the test piece fixing piece. The test piece fixture includes a first fixture 51 and a second fixture 52, the first fixture 51 is used to fix the first side of the test piece, and the second fixture 52 is used to fix the The second side of the test piece, wherein: the first fixing part 51 includes two oppositely arranged plates, and a connecting portion connecting the two plates, the first side is arranged between the two plates, and one of the plates At least one threaded hole is provided on the threaded hole, and a bolt (in this embodiment, the bolt is perpendicular to the first side) is arranged in the threaded hole, and the bolt can abut against the first side in a tightened state. edge, to realize the fixation of the first edge; the second fixing member 52 includes two oppositely arranged plates, and a connecting portion connecting the two plates, the second edge is arranged between the two plates, and One of the plates is provided with at least one threaded hole, and a bolt (in this embodiment, the bolt is perpendicular to the second side) is arranged in the threaded hole, and the bolt can lean against the The second side is pressed against the test piece by tightening the bolts, so that the test piece is pressed against the second fixing member 52 . At the same time, the pressing force provides friction to ensure that the test piece will not move. In order to realize the fixation of the second side. In this way, it is not only convenient to install the test piece, but also can provide reliable fastening force, and more importantly, the test piece will not be damaged. The drawings of this embodiment show that the first fixing member 51 is provided with 6 threaded holes and 6 bolts, and the number of threaded holes (bolts) can also be 1, 2 1, 3, 4, 5 or more than 6, as long as the bolts can be used to fix the test piece.

The test piece includes a first side and a second side, the junction of the first side and the second side is the R zone, and the angle formed by the first side and the second side is generally 90° °±2°.

As a variable implementation manner, the angle formed by the first side and the second side may also be any value between 30° and 120°. In this embodiment, it is only necessary to match the angles of the first fixing part 51 and the second fixing part 52 with the test piece, so that the first side and the second side of the test piece can be fixed. Specifically, the first fixing part 51 matches the angle of the first side, and the second fixing part 52 matches the angle of the second side.

The device of the present invention can adjust the positions of the support arm 3 and the dial gauge 6 according to the size of the test piece and the angle formed by the first side and the second side.

In order to further improve the constraint ability of the test piece fixture to the test piece, the test piece fixture also includes a first constraint piece and a second constraint piece, the first constraint piece is perpendicular to the second constraint piece of the test piece On one side, the second constraint is perpendicular to the second edge, the first constraint provides vertical pressure to the first edge when it abuts against the first edge, and the second constraint A member provides vertical pressure to the second side when abutting against the second side. Specifically, the first constraint includes a handle and a rubber pressure head, and the rubber pressure head of the first constraint is against the first side; the second constraint includes a handle and a rubber pressure head, so The rubber pressure head of the second restraint is against the second edge. Since the test piece needs to restrain out-of-plane deformation and translation along the straight edge during the impact process, the test piece is pressed along the vertical direction of the straight edge by a handle with a rubber head to prevent the test piece from being vertically along the straight edge during the impact process. direction to complete the fixation of the test piece.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the present invention. within the scope of the technical solution of the invention.

Claims (10)

1. A composite material R zone impact point location and damage depth measurement device, is characterized in that, comprising: The base is provided with a groove on the base, at least one threaded hole is provided on the side wall of the groove, and an adjusting bolt is arranged in the threaded hole; a bracket, a bracket is provided on the base; A support arm, an arm is provided on the support, the support arm can move up and down along the support, and a dial gauge is provided on the support arm; a support plate, the support plate is arranged in the groove, and the free end of the screw rod of the adjusting bolt abuts against the support plate, so as to fix the support plate; A test piece fixture, the test piece fixture is used to fix the two ends of the test piece, the test piece fixture is arranged on the support plate, and the dial gauge is facing the R zone of the test piece; and configured as: In the first state, the dial indicator is facing the first area of the R area of the test piece; In the second state, the dial indicator is facing the second area of the R area of the test piece; The dial indicator and the test piece can be displaced in the X-axis direction and the Y-axis direction, the X-axis direction is a direction perpendicular to the longitudinal axis direction of the R zone, and the Y-axis direction is a direction perpendicular to the longitudinal axis direction of the R zone. The direction of the longitudinal axis of the R zone is parallel to the direction, the X-axis direction is the X direction and the opposite direction of the X direction, and the Y-axis direction is the Y direction and the opposite direction of the Y direction. 2. composite material R zone impact point positioning and damage depth measuring device according to claim 1, is characterized in that, A first track is provided on the support, and the support arm can move along the first track to realize the movement of the dial indicator along the X-axis direction; A second rail is provided on the base, and the lower end of the bracket can move on the second rail to realize the movement of the dial gauge along the Y-axis direction. 3. The impact point location and damage depth measuring device in the R zone of composite material according to claim 2, is characterized in that, also comprises a first motor and a second motor, The first motor is used to drive the support arm to move along the X-axis direction; The first motor is used to drive the bracket to move along the Y-axis direction. 4. composite material R zone impact point positioning and damage depth measuring device according to claim 1, is characterized in that, When the adjusting bolt is in a loose state, the support plate can move along the X-axis direction; A sliding groove is arranged on the support plate, and the direction of the sliding groove laying is the Y-axis direction, and a through hole is arranged on the fixing part of the test piece, and a fixing bolt is arranged in the through hole, and the fixing bolt is arranged in the through hole. Bolts pass through the through holes and the sliding slots to adjust and fix the position of the test piece fixture. 5. composite material R zone impact point positioning and damage depth measuring device according to claim 1, is characterized in that, The test piece fixture includes a first fixture and a second fixture, the first fixture is used to fix the first side of the test piece, and the second fixture is used to fix the first side of the test piece two sides, of which: The first fixing member includes two opposite plates, and a connection portion connecting the two plates, the first side is arranged between the two plates, and at least one threaded hole is provided on one of the plates, and the Bolts are provided in the threaded holes, and the bolts can lean against the first side in a tightened state to realize the fixing of the first side; The second fixing member includes two opposite plates, and a connecting portion connecting the two plates, the second edge is arranged between the two plates, and at least one threaded hole is provided on one of the plates, and the Bolts are provided in the threaded holes, and the bolts can abut against the second side in a tightened state, so as to realize the fixing of the second side. 6. composite material R zone impact point positioning and damage depth measuring device according to claim 5, is characterized in that, The test piece includes a first side and a second side, the junction of the first side and the second side is the R zone, and the angle formed by the first side and the second side is 60°～ 120°, the angle of the first fixing part matches the angle of the first side, and the angle of the second fixing part matches the angle of the second side. 7. composite material R zone impact point positioning and damage depth measuring device according to claim 5, is characterized in that, The test piece fixture also includes a first constraint and a second constraint, the first constraint is perpendicular to the first side of the test piece, the second constraint is perpendicular to the second side, the The first constraint provides vertical pressure to the first edge when it abuts on the first edge, and the second constraint applies vertical pressure to the second edge when it abuts on the second edge. The sides provide vertical pressure. 8. composite material R zone impact point positioning and damage depth measuring device according to claim 7, is characterized in that, The first restraint part includes a handle and a rubber pressure head, and the rubber pressure head of the first restraint part leans against the first side; The second constraint includes a handle and a rubber pressure head, and the rubber pressure head of the second constraint abuts against the second edge. 9. Composite material R zone impact point positioning and damage depth measuring device according to claim 1, is characterized in that, The length of the R zone of the test piece is L, the first zone of the R zone is a zone 1/10L to 1/4L away from the first edge of the R zone, and the second zone of the R zone is a distance from the R zone The area with a distance of 1/10L to 1/4L from the second edge. 10. The device for locating the impact point and measuring the depth of damage in the R zone of composite material according to claim 1, characterized in that it comprises two methods of use for locating the impact point and measuring the depth of damage, The use state method of described impact point location comprises the steps: Step 1.1, contacting the first area of the R zone of the test piece with the dial gauge; In step 1.2, the test piece and the dial indicator are displaced in the X-axis direction, the X-axis direction is perpendicular to the longitudinal axis of the R zone, and the point with the smallest reading of the dial gauge during the movement is marked as A point; Step 1.3, displacing the test piece and the dial gauge in the Y-axis direction, the Y-axis direction being parallel to the longitudinal axis of the R zone, making the second zone of the R zone contact the dial gauge, The test piece is moved in the direction opposite to the X-axis direction, and the point with the smallest reading of the dial gauge during the movement is marked as point B; Step 1.4, after connecting the points A and B, extend to a line segment formed by the entire length of the R area, and the midpoint of the line segment is the impact point; The method for measuring the depth of damage comprises the steps of: Step 2.1, directing the dial gauge to point A of the test piece; Step 2.2, the test piece and the dial gauge are displaced so that the dial gauge is from point A to point B, and the maximum value of the dial gauge during this process is recorded as S1; Step 2.3, displacing the test piece and the dial gauge in the opposite direction, so that the dial gauge moves from facing point B to facing point A, and recording the maximum value of the dial gauge during this process as S2; Step 2.4, the impact damage depth value is the average value of S1 and S2.

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