CN215492825U - Guide rail type side pressure test fixture of metal honeycomb sandwich structure - Google Patents
Guide rail type side pressure test fixture of metal honeycomb sandwich structure Download PDFInfo
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- CN215492825U CN215492825U CN202120760939.3U CN202120760939U CN215492825U CN 215492825 U CN215492825 U CN 215492825U CN 202120760939 U CN202120760939 U CN 202120760939U CN 215492825 U CN215492825 U CN 215492825U
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- guide rail
- plates
- clamp groove
- fixed
- sandwich structure
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Abstract
The invention relates to a guide rail type lateral pressure test fixture of a metal honeycomb sandwich structure, which comprises an upper base, a lower base, an upper fixture groove, a lower fixture groove and a guide rail, wherein the upper base is provided with a plurality of guide rails; the upper base and the lower base are steel plates which are oppositely arranged in parallel, and the guide rail is a cylindrical steel bar which is arranged along the circumferential direction of the lower base; the upper clamp groove is formed by two first movable plates and two first fixed plates through bolts, and the lower clamp groove is formed by two second movable plates and two second fixed plates through bolts; the first movable plate and the second movable plate can move along the axial direction of the adjusting bolt, and test pieces with different thicknesses can be clamped. According to the invention, through the constraint of the guide rail, the upper base and the upper clamp groove of the clamp only move in the long edge direction of the test piece in the loading process, and do not move in other directions. Therefore, in the loading process, the additional bending moment can not influence the test piece, the test piece is in a pure compression state, and the measured result is accurate.
Description
Technical Field
The invention belongs to the field of aerospace, and particularly relates to a guide rail type side pressure test fixture of a metal honeycomb sandwich structure.
Background
In the aerospace field, weight reduction is one of the goals sought by structural designers. The metal honeycomb sandwich structure has high specific strength and high specific modulus, and can effectively absorb impact load, so that the metal honeycomb sandwich structure is one of important structural materials in the field of aerospace. The metal honeycomb sandwich structure is subjected to various complex loads in the using process, and the strength and stability problems under the complex loads are first considered problems. Before the metal honeycomb sandwich structure is actually applied to engineering, a series of tests must be carried out, and the problems of strength and stability of the structure under different boundary conditions and loading effects are researched through the tests, so that a reliable and effective basis is provided for the design and application of the structure. The side pressure test of the metal honeycomb sandwich structure is a test for researching the strength and the stability of the structure. In the lateral pressure test, if the long edge of a test piece is restrained, the strength of the structure is studied; if the long side of the test piece is not constrained, the stability of the structure is studied.
The metal honeycomb sandwich structure may have different thicknesses of the entire structure due to the difference in the thicknesses of the core and the panel, and the length and width of the test piece of the metal honeycomb sandwich structure may vary as needed. Therefore, in the lateral pressure test of the metal honeycomb sandwich structure, the lateral pressure clamp is required to be flexibly adjusted to meet test pieces with different sizes. When the mechanical properties of the metal honeycomb sandwich structure are researched, a side pressure test is rarely carried out to research the side pressure strength or stability of the metal honeycomb sandwich structure. Because the sizes of the test pieces are different, a side pressure test fixture which can be flexibly adjusted to meet the test pieces with different sizes is needed. Meanwhile, when a side pressure test is carried out, the load must always act on the central position of the test piece, otherwise, the eccentric distance is generated on the test piece, and the test piece is bent and unstable in advance, so that the measured limit load is smaller.
The following three patents are related to the side pressure test fixture at present:
an assembling clamp for a sandwich structure plate side pressure test. The inventor: high-dimensional, huazhou, etc. Application publication No.: CN 105241751A. The side pressure test fixture is used for side pressure tests of large-size asymmetric sandwich structure plates, and solves the problems of large deflection and difficult centering of a pressure center in the side pressure tests. However, this lateral pressure test jig is complicated in structure and is not easy to machine.
Marine composite material plate structure side pressure test fixture. The inventor: yanna, poplar waves, etc. Application publication No.: CN 106896023A. This side pressure test jig is used for the side pressure test of the composite sheet. The lateral pressure test fixture is simple in structure and high in practicability, but the long edge of the test piece is fixedly supported and restrained by the fixture, so that the boundary restraint is too strong.
A test device for simulating axial compression stiffened plates. The inventor: yangshao, Yangyi, etc. Application publication No.: CN 109297821A. The side pressure test fixture is used for side pressure test of the thin-wall reinforced structure. The lateral pressure test fixture is suitable for lateral pressure tests of stiffened plates with different sizes, simple support constraint is carried out on the long edge of a test piece, and the long edge simple support boundary condition of an axially compressed stiffened plate can be well simulated. However, this jig needs to be fixed to the ground, and therefore requires a special test site, and is not highly applicable.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides a guide rail type side pressure test fixture of a metal honeycomb sandwich structure, which can be flexibly adjusted to meet the requirements of test pieces with different sizes and enable loads to be always acted on the center position of the test piece.
The technical scheme of the invention is as follows: the utility model provides a guide tracked side pressure test fixture of metal honeycomb sandwich structure which characterized in that: comprises an upper base, a lower base, an upper clamp groove, a lower clamp groove and a guide rail; the lower base is positioned at the bottom and used as a support of the whole device, and the upper base is fixed above the lower base in parallel through a guide rail arranged along the circumferential direction; the guide rail is a cylindrical steel bar, one end of the guide rail is vertically fixed on the upper end surface of the lower base, the other end of the guide rail penetrates through a guide rail hole formed in the circumferential direction of the upper base, and the cylindrical steel bar and the guide rail hole are in clearance fit, so that the upper base can be guaranteed to move along the height direction of the test piece in the loading process;
the upper clamp groove comprises two first movable plates and two first fixed plates, the two first fixed plates are parallel to each other and are vertically fixed at two ends of the lower surface of the upper base, and the two first movable plates are respectively fixed at the outer sides of the two first fixed plates in parallel through fixing bolts, so that the clamp groove is formed between the first movable plates and the first fixed plates at two ends; threaded holes are formed in the two first movable plates, and an adjusting bolt penetrates through the threaded holes to clamp the test piece in the upper clamp groove;
the lower clamp groove comprises two second movable plates and two second fixed plates, the two second fixed plates are parallel to each other and are vertically fixed at two ends of the upper surface of the lower base, and the two second movable plates are respectively fixed at the outer sides of the two second fixed plates in parallel through fixing bolts, so that a clamp groove is formed between the two second movable plates at two ends and the first fixed plate; threaded holes are formed in the two second movable plates, and an adjusting bolt penetrates through the threaded holes to clamp the test piece in the lower clamp groove;
the first movable plate and the second movable plate can move along the axial direction of the adjusting bolt, and test pieces with different thicknesses can be clamped.
The further technical scheme of the invention is as follows: the upper base and the lower base are both rectangular steel plates.
The further technical scheme of the invention is as follows: the movable plate and the fixed plate are both strip-shaped steel plates.
The further technical scheme of the invention is as follows: the number of the guide rails is 4, and the guide rails are respectively positioned at four top corners of the rectangular steel plate.
The further technical scheme of the invention is as follows: the assembly clearance between the cylindrical steel bar and the guide rail hole is 0.1 mm.
The further technical scheme of the invention is as follows: the two first fixing plates are symmetrical relative to the central line of the upper base.
The further technical scheme of the invention is as follows: the lower clamp groove and the upper clamp groove are oppositely arranged.
The further technical scheme of the invention is as follows: the first movable plate and the second movable plate are respectively provided with two through holes and two threaded holes, the two through holes are positioned at two ends of the movable plate in the length direction, and the two threaded holes are positioned at the inner sides of the two through holes; a fixing bolt is arranged in each through hole, the fixing bolt is in clearance fit with the through holes, and the tail end of the fixing bolt is connected with the fixing plate through external threads; and an adjusting bolt is arranged in each threaded hole, the middle part of the adjusting bolt is matched with the threaded hole through threads to realize axial displacement, and the tail end of the adjusting bolt is of a smooth structure and is used for compressing a test piece.
Advantageous effects
The invention has the beneficial effects that:
1. the invention restrains the long edge of the test piece of the metal honeycomb sandwich structure and is used for measuring the stability of the metal honeycomb sandwich structure.
2. According to the invention, through the constraint of the guide rail, the upper base and the upper clamp groove of the clamp only move in the long edge direction of the test piece in the loading process, and do not move in other directions. Therefore, in the loading process, the additional bending moment can not influence the test piece, the test piece is in a pure compression state, and the measured result is accurate.
3. The side pressure test fixture is composed of 10 steel plates, 4 steel columns and 8 bolts, and is simple to produce. In addition, the clamp does not need to be connected with a testing machine, can be used on most of test pieces, and is high in applicability.
Drawings
FIG. 1 is a front view of a side pressure test fixture of the present invention;
FIG. 2 is a top view of the side pressure test fixture of the present invention;
FIG. 3 is a side view of the side pressure test fixture of the present invention;
description of reference numerals: 1. the movable type base comprises an upper base, 2, a lower base, 3, a first movable plate, 4, a second movable plate, 5, a first fixed plate, 6, a second fixed plate, 7, a fixed bolt, 8, an adjusting bolt, 9, a fixed bolt, 10, an adjusting bolt, 11, a guide rail, 12 and a guide rail hole.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
With reference to fig. 1 to 3, the test fixture is composed of five parts: the device comprises an upper base 1, a lower base 2, an upper clamp groove, a lower clamp groove and a guide rail 11. The upper clamp groove is composed of two first fixed plates 5 and two first movable plates 3, and the lower clamp groove is composed of two second fixed plates 6 and two second movable plates 4. The guide rail 11 is composed of four cylindrical steel bars.
The upper clamp groove consists of two fixed plates and two movable plates. The two fixed plates are fixed on the same side of the upper base through welding and are symmetrical about a central line, and each fixed plate is provided with a row of hole structures. The hole structure includes two threaded holes and two through holes, the two through holes being on the outside and the two threaded holes being on the inside. A fixing bolt is placed in each through hole, the tail end of each fixing bolt is provided with an external thread, the assembling clearance between each fixing bolt and the through hole is small, and the fixing bolts can slide in the through holes. An adjusting bolt is arranged in each threaded hole, the tail end of each adjusting bolt is smooth, and the adjusting bolts can be moved in the threaded holes through screwing. The two movable plates are used for clamping and fixing the test piece, and the movable plates can only move in the thickness direction of the test piece so as to adapt to test pieces with different thicknesses. The ends of the fixing bolts in the two through holes are screwed into the movable plate to restrict the freedom degrees of the movable plate in other two directions. The tail ends of the adjusting bolts in the two threaded holes are in contact with the movable plate, and the adjusting bolts are screwed to enable the movable plate to move in the thickness direction of the test piece.
The lower clamp groove is located on the same side of the lower base in the same manner. Four right angle accessories of the upper base are respectively provided with a round hole which is respectively assembled with four cylindrical guide rails, and the assembling clearance is 0.1mm, so that the upper base can only move in the height direction of a test piece in the loading process. Four right-angle accessories of the lower base are fixedly provided with four cylindrical guide rails through welding, and the positions of the four right-angle accessories are consistent with the positions of the four round holes of the upper base.
The fixing plate of the upper clamp groove and the fixing plate of the lower clamp groove are symmetrical about two horizontal and vertical central lines of the base, and the guide rail hole and the guide rail are also symmetrical about two central lines of the base.
1. When installing the test piece, the test piece is firstly placed on the lower base 2 and positioned between the two movable plates 4 of the lower clamp groove. Two fixing plates 6 of the lower clamp groove are fixed on the lower base 2 through welding, and two through holes and two threaded holes are respectively drilled in the two fixing plates 6. Two screw holes are used for assembling the bolt 7, the bolt 7 is tapped, and the position of the movable plate 4 in the thickness direction of the test piece is adjusted by rotating the bolt 7. Two through holes are used for assembling the bolt 8, the bolt 8 is only tapped at the end, and the bolt 8 is screwed into the movable plate 4 at the end for restraining the movable plate from moving in the other two directions.
2. The position of the movable plate 4 is adjusted by rotating the bolt 7 so that the left and right movable plates are symmetrical about the center line of the lower base 2, and then the bolt 7 is tightened, so that the lower end of the test piece can be fixed.
3. The upper base 1 is placed, and four guide rails 11 fixed to the lower base 2 by welding are passed through four guide rail holes 12 of the upper base 1. Two fixing plates 5 of the upper clamp groove are fixed on the upper base 1 through welding, and two through holes and two threaded holes are respectively drilled in the two fixing plates 5. Two screw holes are used for assembling the bolt 9, the bolt 9 is tapped, and the movement of the movable plate 3 in the thickness direction of the test piece is adjusted by rotating the bolt 9. Two through holes are used for assembling the bolt 10, the bolt 10 is only tapped at the end, and the bolt 10 is screwed into the movable plate 3 at the end for restraining the displacement of the movable plate in the other two directions.
4. The position of the movable plate 3 is adjusted by rotating the bolt 9 so that the left and right movable plates are symmetrical about the center line of the upper base 1, and then the bolt 9 is tightened, so that the upper end of the test piece can be fixed.
5. After the upper end and the lower end of the test piece are fixed, the test piece is installed.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. The utility model provides a guide tracked side pressure test fixture of metal honeycomb sandwich structure which characterized in that: comprises an upper base, a lower base, an upper clamp groove, a lower clamp groove and a guide rail; the lower base is positioned at the bottom and used as a support of the whole device, and the upper base is fixed above the lower base in parallel through a guide rail arranged along the circumferential direction; the guide rail is a cylindrical steel bar, one end of the guide rail is vertically fixed on the upper end surface of the lower base, the other end of the guide rail penetrates through a guide rail hole formed in the circumferential direction of the upper base, and the cylindrical steel bar and the guide rail hole are in clearance fit, so that the upper base can be guaranteed to move along the height direction of the test piece in the loading process;
the upper clamp groove comprises two first movable plates and two first fixed plates, the two first fixed plates are parallel to each other and are vertically fixed at two ends of the lower surface of the upper base, and the two first movable plates are respectively fixed at the outer sides of the two first fixed plates in parallel through fixing bolts, so that the clamp groove is formed between the first movable plates and the first fixed plates at two ends; threaded holes are formed in the two first movable plates, and an adjusting bolt penetrates through the threaded holes to clamp the test piece in the upper clamp groove;
the lower clamp groove comprises two second movable plates and two second fixed plates, the two second fixed plates are parallel to each other and are vertically fixed at two ends of the upper surface of the lower base, and the two second movable plates are respectively fixed at the outer sides of the two second fixed plates in parallel through fixing bolts, so that a clamp groove is formed between the two second movable plates at two ends and the first fixed plate; threaded holes are formed in the two second movable plates, and an adjusting bolt penetrates through the threaded holes to clamp the test piece in the lower clamp groove;
the first movable plate and the second movable plate can move along the axial direction of the adjusting bolt, and test pieces with different thicknesses can be clamped.
2. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the upper base and the lower base are both rectangular steel plates.
3. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the movable plate and the fixed plate are both strip-shaped steel plates.
4. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the number of the guide rails is 4, and the guide rails are respectively positioned at four top corners of the rectangular steel plate.
5. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the assembly clearance between the cylindrical steel bar and the guide rail hole is 0.1 mm.
6. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the two first fixing plates are symmetrical relative to the central line of the upper base.
7. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the lower clamp groove and the upper clamp groove are oppositely arranged.
8. The metal honeycomb sandwich structure guide rail type lateral pressure test fixture according to claim 1, which is characterized in that: the first movable plate and the second movable plate are respectively provided with two through holes and two threaded holes, the two through holes are positioned at two ends of the movable plate in the length direction, and the two threaded holes are positioned at the inner sides of the two through holes; a fixing bolt is arranged in each through hole, the fixing bolt is in clearance fit with the through holes, and the tail end of the fixing bolt is connected with the fixing plate through external threads; and an adjusting bolt is arranged in each threaded hole, the middle part of the adjusting bolt is matched with the threaded hole through threads to realize axial displacement, and the tail end of the adjusting bolt is of a smooth structure and is used for compressing a test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120760939.3U CN215492825U (en) | 2021-04-14 | 2021-04-14 | Guide rail type side pressure test fixture of metal honeycomb sandwich structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120760939.3U CN215492825U (en) | 2021-04-14 | 2021-04-14 | Guide rail type side pressure test fixture of metal honeycomb sandwich structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215492825U true CN215492825U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120760939.3U Expired - Fee Related CN215492825U (en) | 2021-04-14 | 2021-04-14 | Guide rail type side pressure test fixture of metal honeycomb sandwich structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215492825U (en) |
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2021
- 2021-04-14 CN CN202120760939.3U patent/CN215492825U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220111 |