CN115508205A - Composite material cap type stringer pull-off test device and test method - Google Patents
Composite material cap type stringer pull-off test device and test method Download PDFInfo
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- CN115508205A CN115508205A CN202211225746.3A CN202211225746A CN115508205A CN 115508205 A CN115508205 A CN 115508205A CN 202211225746 A CN202211225746 A CN 202211225746A CN 115508205 A CN115508205 A CN 115508205A
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- 238000007585 pull-off test Methods 0.000 title claims abstract description 72
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- 238000007586 pull-out test Methods 0.000 claims description 4
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- 238000010892 electric spark Methods 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention belongs to the field of airplane composite material structural strength tests, and particularly relates to a composite material hat type stringer pull-off test device and a test method. The pull-off test device comprises: a fixed base; the two test piece clamping blocks are arranged on the fixed base and are respectively used for fixing two ends of the bottom plate part of the hat-shaped stringer; the tension loading assembly is arranged above the fixed base and used for fixing the cap top of the cap type stringer so as to provide a force far away from the fixed base for the cap top, and the direction of the force is perpendicular to the upper surface of the fixed base. According to the pull-off test method, the hat type stringer is arranged on the pull-off test device, and then a pull-off test is carried out on a pull-off test machine. The invention can realize the pull-off test of the out-of-plane tensile load of the closed hat type stringer structure and can realize the uniform transmission of the load to the cementing areas of the hat bottoms on the two sides.
Description
Technical Field
The invention belongs to the field of airplane composite material structural strength tests, and particularly relates to a composite material hat type stringer pull-off test device and a test method.
Background
Carbon fiber composite materials are widely used in aerospace structures due to their high specific stiffness and specific strength. The composite hat stringer is a closed cross section, so the torsional stiffness and bending stability are much higher than those of the commonly used T-shaped and L-shaped profile stringers. And the closed section of the hat-shaped stringer can avoid the defect that the T-shaped stringer and the L-shaped stringer are easy to generate impact damage at the edge of the structure after being impacted, and the hat-shaped stringer is widely applied to the field of modern aircraft panel structure design. The hat stringers and skin are typically manufactured as composite stringer stiffened panels by a co-cementing or co-curing molding process. In aircraft construction, the panel structure formed by the hat stringers and skin is subjected primarily to tensile, bending, shear or combination loads. Because of the characteristics of the bond between the hat stringer and the skin, the structure has a relatively weak ability to resist out-of-plane tensile loads, and therefore pull-off failure is one of the primary failure modes for hat stringers.
Due to the characteristic of the closed section of the composite hat-shaped stringer, the load of the pull-off load cannot be loaded like a T-shaped stringer or an L-shaped stringer through a bolt or a direct clamping mode. It is difficult to apply tensile loading to a hat stringer having a closed cross-section.
Disclosure of Invention
The invention aims to provide a device for realizing a pull-out test of a composite hat type stringer wallboard structure, which aims to solve the problem that the existing pull-out test device cannot carry out the pull-out test on a hat type stringer with a closed cross section.
The purpose of the invention is realized by the following technical scheme.
By a composite hat stringer pull-off test apparatus, comprising:
a fixed base;
the two test piece clamping blocks are arranged on the fixed base and are respectively used for fixing two ends of the bottom plate part of the hat-shaped stringer;
the tension loading assembly is arranged above the fixed base and used for fixing the cap top of the cap type stringer so as to provide a force far away from the fixed base for the cap top, and the direction of the force is perpendicular to the upper surface of the fixed base.
In the above-mentioned long purlin of combined material hat type pulls off test device, the tensile force loading subassembly includes:
the pulling block part is in a strip shape, the pulling block penetrates through the inner cavity of the hat-shaped stringer, and two ends of the pulling block part extend out of two sides of the inner cavity;
the two ends of the pull hook part comprise two clamping grooves which are connected through a connecting strip, the connecting strip is provided with a threaded hole, and the two ends of the pull block part are respectively detachably clamped into the two clamping grooves;
one end of the spherical hinge part is provided with a threaded rod, the other end of the spherical hinge part is provided with a spherical hinge, and the threaded rod is screwed into the threaded hole of the pull hook part to complete the connection of the spherical hinge part and the pull hook part; a threaded rod with a certain length is arranged on the lower side of the pull rod and is screwed into a threaded hole in the drag hook to realize connection;
the pull lug part is connected with the spherical hinge of the spherical hinge part through a pin shaft, so that the pull hook part is in universal connection with the pull lug part;
the pull rod part is arranged on the pull lug part and is used for being connected with a pull-off test piece;
when the tension loading assembly provides tension to the hat type stringer, the direction of the force is the direction of the central shaft of the pull rod part, and the direction of the clamping groove is perpendicular to the direction of the force.
In the composite material hat type stringer pull-off test device, two ends of the pull block part extend out of two sides of the top of the hat by at least one centimeter;
in the composite material hat type stringer pull-off test device, the edge angle of the first surface of the pull block part is in a chamfer shape or an arc shape, and the first surface is a contact surface with the hat top plane of the hat type stringer;
in the composite material hat type stringer pull-off test device, the width of the pull block is consistent with that of a hat top plane.
In the composite material hat type stringer pulling-out test device, the clamping groove is in a long strip shape, and the thickness of the long strip-shaped clamping groove is the same as that of the pulling block part; or
In the composite material hat-shaped stringer pull-off test device, the clamping groove is provided with a groove, and the pull block part is arranged in the groove.
In the composite material hat-shaped stringer pull-off test device, the pull lug part is a U-shaped pull lug, the lower side of the U-shaped pull lug is assembled with the loading pin, and the upper side of the U-shaped pull lug is connected with the pull rod part.
In the composite material hat type stringer pull-off test device, the fixed base is provided with a slide rail, and the two test piece clamping blocks can slide on the slide rail;
in the composite material hat-shaped stringer pull-off testing device, the fixing base is provided with the bolt hole, the bolt hole is in threaded connection with the bottom connecting rod, and the bottom connecting rod is fixedly connected with the pull-off testing machine.
Among the foretell long purlin of combined material cap type draws and takes off test device, the test piece grip block includes grip block, lower grip block and bolt, the grip block sets up down on the unable adjustment base, it has the recess to open on the upper surface of grip block down, the tip of the long purlin of cap type is arranged in the recess, go up the grip block with the grip block is used for the centre gripping down the tip of the long purlin of cap type, go up the grip block with the grip block provides the clamping-force through the bolt tightening down.
In the composite material hat-shaped stringer pull-off test device, the bottom of the groove of the lower clamping block is a frosted surface, the bottom surface of the upper clamping block is a frosted surface, and the frosted surface can provide friction force to prevent the test piece from sliding when being loaded.
The object of the present invention can be achieved by the following means.
The composite hat stringer pull-off test method was performed by mounting the hat stringer on the composite hat stringer pull-off test apparatus of the previous examples and then performing the pull-off test on a pull-off test machine.
The pull-off test method comprises the following steps:
step 3, clamping two ends of the pulling block part into clamping grooves of the pulling hook part;
and 5, carrying out a pull-off test with the displacement speed of the cross beam being 1-2 mm/min.
By the technical scheme, the invention at least has the following advantages:
1) The composite hat stringer pull-off test device provided by the specific embodiment of the invention can realize the pull-off test of the out-of-plane tensile load of the closed hat stringer structure;
2) According to the composite material hat type stringer pull-off test device provided by the embodiment of the invention, the load can be uniformly transmitted to the cementing areas of the hat bottoms on the two sides by using the spherical hinge, so that the pull-off test result is more reliable.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a composite hat stringer pull-off test apparatus of the present invention;
fig. 2 is a schematic structural view of the hat type long honing of the present invention;
FIG. 3 is a schematic view of the construction of the pull block portion of the present invention;
fig. 4 is a schematic structural view after the cap type long honing and pulling block part of the invention is assembled;
FIG. 5 is a schematic view of the assembled pulling block and pulling hook of the present invention;
FIG. 6 is a schematic structural view of the test piece after the test piece is assembled with the test piece clamping block and the tension loading assembly;
FIG. 7 is a schematic view of the construction of the pull-off tester of the present invention;
FIG. 8 is a photograph of an example of a composite hat stringer pull-off test method of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Example of a composite Cap stringer Pull-off test apparatus
The composite hat stringer pull-off test apparatus shown in fig. 1 to 5 includes: a fixed base 1; the two test piece clamping blocks 2 are arranged on the fixed base 1, and the two test piece clamping blocks 2 are respectively used for fixing two ends of a bottom plate part 41 of a hat-shaped stringer 4 (namely a test piece to be tested in the test); a tension loading assembly disposed above the fixing base 1, the tension loading assembly being configured to fix the cap top 42 of the cap stringer 4 to provide a force to the cap top 42 away from the fixing base 1, the direction of the force being perpendicular to the upper surface of the fixing base 1 (i.e., the bottom plate portion 41 of the cap stringer 4).
The utility model provides a long purlin of combined material hat type draws takes off test device, simple structure exerts the perpendicular to cap top 42 through pulling force loading subassembly the glued district at the bottom of the cap can be realized evenly transmitting of load to the power of unable adjustment base 1's upper surface, realizes even loading, has avoided the production of yawing force. The testing device for realizing the pull-off loading of the hat-shaped stringer 4 and realizing the uniform load distribution achieves the purposes of verifying the pull-off strength and the failure mode of the hat-shaped stringer 4.
In order to further realize uniform load transmission to the gluing area of the two side cap bottoms, the embodiment further designs the tension loading assembly. Specifically, the tension loading assembly comprises: the device comprises a pulling block part 31, a pulling hook part 32, a spherical hinge part 33, a pulling lug part 34 and a pulling rod part 35, wherein the pulling block part 31 is in a strip shape, the pulling block penetrates through the inner cavity of the hat-shaped stringer 4, and two ends of the pulling block part 31 extend out of two sides of the inner cavity; the two ends of the pulling hook part 32 comprise two clamping grooves, the two clamping grooves are connected through a connecting strip 320, a threaded hole is formed in the connecting strip 320, and the two ends of the pulling block part 31 are respectively clamped into the two clamping grooves; one end of the spherical hinge part 33 is provided with a threaded rod 332, the other end of the spherical hinge part is provided with a spherical hinge 331, and the threaded rod is screwed into the threaded hole of the hook part 32 to complete the connection with the hook part 32; the lower side of the pull rod part 35 is provided with an external threaded rod with a certain length, and the threaded rod is used for being screwed into a threaded hole in the pull hook part 32 to realize the connection of the pull rod part 35 and the pull hook part 32; the pull lug part 34 is connected with the spherical hinge 331 of the spherical hinge part 33 through a pin 36, so that the pull hook part 32 is connected with the pull lug part 34 in a universal mode; the pull rod part 35 is arranged on the pull lug part 34, and the pull rod part 35 is used for being connected with a pull-off test piece; when the tension loading assembly provides tension to the hat stringer 4, the direction of the force is the central axis direction of the pull rod part 35, and the direction of the slot is perpendicular to the direction of the force.
In practical implementation, the hook portion 32 is used for hooking the pull block portion 31 and transferring an upward tensile load to the pull block portion 31. Ball pivot portion 33 includes threaded rod 332 and ball pivot 331 two parts, the mode of the threaded connection of draw-bar portion 35 and drag hook portion 32 is convenient for dismantle firstly, still is convenient for realize in addition that the screw hole sets up in the intermediate position to further realize that pulling force evenly distributed to the testpieces both sides.
The spherical hinge part 33 is assembled with the pull rod part 35 and the pull lug part 34, so that universal rotation can be realized. The lower side of the pull lug part 34 is assembled with a loading pin 36, and the upper side of the pull lug part is connected with an upper chuck of the pull-off testing machine through the pull rod part 35. The loading pin 36 passes through a round hole in the middle of the ball joint to connect the pull lug part 34 and the ball joint part 33. The pull lug part 34 and the loading pin 36 are assembled, and the pull-off load is applied through an upper chuck of the pull-off testing machine, so that the pull-off test is completed.
Through the ball pivot of ball pivot portion 33 realized drag hook portion 32 with draw ear 34 universal connection, that is to say in the long purlin of combined material hat type draws takes off test device test process, always can realize pulling force loading subassembly perpendicular to unable adjustment base 1, that is to say can guarantee pulling force loading subassembly evenly transmits load to the cap top both sides of test piece.
In this embodiment, the composite material hat type stringer pull-off test device can realize uniform load transfer to the glue joint area of the hat bottoms on two sides by using the spherical hinge, and the pull-off test of the out-of-plane tensile load of the closed hat type stringer 4 structure (the out-of-plane tensile load can generate pull-off damage of the glue interface) is realized by the detachable assembly of the pull block part 31 and the pull hook part 32.
In order to further ensure that the load is uniformly distributed on the plane of the top of the test piece, the width of the pull block is consistent with that of the plane of the top of the cap, so that the concentration of the load can be reduced to the maximum extent, uniform tensile force is generated at the glue joint areas on the two sides of the bottom of the cap, and the condition that the glue joint interface is unevenly stressed is avoided.
Further, in order to facilitate the installation of the hook portion 32, both ends of the pull block portion 31 protrude from both sides of the cap top by at least one centimeter.
As shown in fig. 2, the bottom plate portion and the crown portion were fixed together by gluing to form a test piece (i.e., a cap stringer 4 and a skin constructed by co-cementing in the field of simulation of aviation). The test piece shown is a hat stringer 4 panel structure made of carbon fiber composite material, and in the field of aviation, the hat stringer 4 and the skin are made through a co-cementing process.
In order to prevent the corners of the pull block portion 31 from damaging the test piece during the mounting process and the testing process, the corners of the first surface of the pull block portion 31 are chamfered 310 or rounded (see fig. 3 and 4 in particular), and the first surface is a contact surface with the hat top plane of the hat-shaped stringer 4.
The pulling block part 31 passes through the inner cavity of the hat type stringer 4 and is in plane contact with the hat top. The width of the pull block part 31 is consistent with that of the hat top plane, and the contact surface between the pull block part 31 and the hat-shaped stringer 4 is chamfered 310, so that the test piece is prevented from being damaged by sharp corners.
The length of the pull block part 31 is longer than that of the hat stringer 4, and is used for installing the pull hook part 32.
Further, as shown in fig. 5 and 6, in order to facilitate the assembly of the pull block portion 31 and the pull hook portion 32, the slot on the pull hook portion 32 is long, and the thickness of the long slot is the same as that of the pull block portion 31. In this embodiment, the pull block portion 31 is installed from one side of the card slot, and when a force is applied to the tab portion 34, the pull rod portion 35 is transmitted to the pull hook portion 32 and then to the pull block portion 31, and the force is perpendicular to the pull block portion 31, so that the pull block portion 31 is not separated from the card slot.
Of course, as a variable embodiment, in order to realize the positioning of the pull block portion 31 and avoid the sliding of the pull block portion 31, a groove (not shown in the drawings) may be further provided in the slot, and the pull block portion 31 is placed in the groove.
Specifically, the pull tab is a U-shaped pull tab (see the drawings specifically), the lower side of the U-shaped pull tab is assembled with the loading pin 36, and the pull rod part 35 on the upper side is connected.
Further, in order to adapt the composite hat stringer pull-off test device to test pieces with different sizes, another embodiment of the present embodiment further designs the fixing base 1. Specifically, be equipped with slide rail 10 on unable adjustment base 1, two test piece grip blocks 2 can slide on the slide rail 10 be equipped with U type groove down on the grip block 22, the shape in U type groove with the shape phase-match of slide rail 10 is in order to satisfy grip block 22 is in slide on the slide rail 10 down, unable adjustment base 1 can require the slip grip block according to test piece length or centre gripping length, realizes the adjustment of different support spans.
Still be equipped with bottom connecting rod 101 on unable adjustment base 1, specifically be equipped with bolt hole 100 on unable adjustment base 1, bolt hole 100 with bottom connecting rod 101 threaded connection, bottom connecting rod 101 with draw and take off testing machine fixed connection. Bolt hole 100 is central screw hole, central screw hole and bottom connecting rod 101 (have the external screw thread on the connecting rod 101 of bottom) are connected, realize connecting and centering through the screw hole of twisting unable adjustment base 1 center, the connecting rod is used for with draw off the testing machine centre gripping fixed, draw off the chuck of testing machine and press from both sides tight bottom connecting rod 101 and realize that fixing support is fixed on drawing off the testing machine. Through the connection mode, the axis of the pull-off testing machine and the pull rod part 32 of the clamp can be coaxial.
Further, in order to facilitate the fixing of the test piece, the test piece clamping block 2 includes an upper clamping block 21, a lower clamping block 22, a first bolt and a second bolt, the upper clamping block 21 and the lower clamping block 22 are fixed by the first bolt 23, the lower clamping block 22 is fixed on the fixing base 1 by the second bolt, a groove is formed on the upper surface of the lower clamping block 22, the end of the hat-shaped stringer 4 is placed in the groove, the upper clamping block 21 and the lower clamping block 22 clamp the end of the hat-shaped stringer 4 through the groove, and the upper clamping block 21 and the lower clamping block 22 provide clamping force by screwing the first bolt 23.
In this embodiment, the lower clamping block 22 is fixed on the fixed base 1 by four second bolts, and the two test piece clamping blocks 2 can be moved along the slide rail 10 in a loose state of the second bolts, so as to realize a required test piece supporting span. During installation, the position of the lower clamping block 22 is adjusted according to the length of a test piece, then the lower clamping blocks 22 on two sides are fixed on the fixed base 1 through four second bolts, finally the test piece is placed into the groove, the upper clamping block 21 and the lower clamping block 22 are fixed, and the positioning of the test piece 4 is achieved. Specifically, the upper clamping block 21 and the lower clamping block 22 on the left and right sides of the fixing base 1 are screwed together using four first bolts 23, respectively, to complete the clamping of the test piece 4.
Further, in order to improve the fixing capacity of the clamping block 2 to the test piece 4, the bottom of the groove of the lower clamping block 22 is a frosted surface, the bottom surface of the upper clamping block 21 is a frosted surface, and the frosted surface can provide friction force to prevent the test piece 4 from sliding during loading. Specifically, the bottom of the groove is provided with a frosted surface through electric sparks. The bottom surface of the upper clamping block 21 is provided with a frosted surface through electric sparks, the test piece is clamped by the upper and lower clamping blocks 22, and the frosted surface can provide friction force to prevent the test piece from sliding during loading.
Example of composite Cap stringer Pull-off test method
As shown in fig. 7, the present embodiment provides a composite hat stringer pull-off test method, specifically, a hat stringer 4 test piece is mounted on the composite hat stringer pull-off test apparatus in the above embodiments, and then a pull-off test is performed on a pull-off tester, where the pull-off test method includes the following steps:
step 3, clamping two ends of the pulling block part 31 into clamping grooves of the pulling hook part 32;
and 5, performing a pull-off test with the displacement speed of the cross beam being 1-2 mm/min.
The pull-off test is a test for the pull-off strength and failure mode of the test piece. The maximum range of the pull-off test piece is selected to be controlled as far as possible within the range of estimating the maximum range of the equipment with the pull-off damage load of 10% -90%. A specific example of the pull-off test of the hat stringer using the composite hat stringer pull-off test method of this embodiment is shown in fig. 8.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a long purlin of combined material hat type draws and takes off test device which characterized in that includes:
a fixed base;
the two test piece clamping blocks are arranged on the fixed base and are respectively used for fixing two ends of the bottom plate part of the hat-shaped stringer;
the tension loading assembly is arranged above the fixed base and used for fixing the cap top of the cap type stringer so as to provide force far away from the fixed base for the cap top, and the direction of the force is perpendicular to the upper surface of the fixed base.
2. The composite hat stringer pull-off test apparatus of claim 1, wherein said tension loading assembly comprises:
the pulling block part is in a strip shape, the pulling block penetrates through the inner cavity of the hat-shaped stringer, and two ends of the pulling block part extend out of two sides of the inner cavity;
the two ends of the pull hook part comprise two clamping grooves which are connected through a connecting strip, the connecting strip is provided with a threaded hole, and the two ends of the pull block part are respectively detachably clamped into the two clamping grooves;
the spherical hinge part is provided with a threaded rod at one end and a spherical hinge at the other end, and the threaded rod is screwed into the threaded hole of the pull hook part to complete the connection of the spherical hinge part and the pull hook part;
the pull lug part is connected with the spherical hinge of the spherical hinge part through a pin shaft, so that the universal connection between the pull hook part and the pull lug part is realized;
the pull rod part is arranged on the pull lug part and is used for being connected with a pull-out test piece;
when the tension loading assembly provides tension to the hat-shaped stringer, the direction of the force is the direction of the central shaft of the pull rod part, and the direction of the clamping groove is perpendicular to the direction of the force.
3. The composite hat stringer pull-off test apparatus of claim 2,
two ends of the pulling block part extend out of two sides of the top of the cap by at least one centimeter;
the edge angle of the first surface of the pulling block part is in an inverted angle shape or an arc shape, and the first surface is a contact surface with the hat top plane of the hat-shaped stringer;
the width of the pull block is consistent with that of the plane of the top of the hat.
4. The composite hat stringer pull-off test apparatus of claim 2,
the clamping groove is in a long strip shape, and the thickness of the long strip-shaped clamping groove is the same as that of the pulling block part; or
A groove is formed in the clamping groove, and the pulling block portion is arranged in the groove.
5. The composite hat stringer pull-off test apparatus of claim 2,
draw the ear to draw the ear for the U type, the U type draw the downside of ear with the loading pin assembly, the upside with pull rod portion connects.
6. The composite hat stringer pull-off test apparatus of claim 1,
a slide rail is arranged on the fixed base, and the two test piece clamping blocks can slide on the slide rail;
the fixing base is provided with a bolt hole, the bolt hole is in threaded connection with the bottom connecting rod, and the bottom connecting rod is fixedly connected with the pull-off testing machine.
7. The composite hat stringer pull-off test apparatus of claim 1,
the test piece grip block includes grip block, lower grip block and bolt, the grip block sets up down on the unable adjustment base, it has the recess to open on the upper surface of grip block down, the tip of hat type stringer is arranged in the recess, go up the grip block with the grip block is used for the centre gripping down the tip of hat type stringer, go up the grip block with the grip block provides clamping-force through bolt tightening down.
8. The composite hat stringer pull-off test apparatus of claim 7,
the bottom of the groove of the lower clamping block is a frosted surface, the bottom surface of the upper clamping block is a frosted surface, and the frosted surface can provide friction force to prevent the test piece from sliding during loading.
9. A composite hat stringer pull-off test method is characterized in that,
mounting the hat stringer on the composite hat stringer pull-off test apparatus of any one of claims 1 to 8, and then performing a pull-off test on a pull-off tester.
10. The composite hat stringer pull-off test method of claim 9, wherein said pull-off test method comprises the steps of:
step 1, fixing two ends of a bottom plate part of the hat-shaped stringer on a fixed base through two test piece clamping blocks respectively;
step 2, inserting the pulling block part into the inner cavity of the hat-shaped stringer;
step 3, clamping two ends of the pulling block part into clamping grooves of the pulling hook part;
step 4, connecting a pull rod part of the tension loading assembly with an upper chuck end of the pull-off test piece, fixing the upper chuck on an upper cross beam of the pull-off test machine, connecting the fixed base with a lower chuck of the pull-off test machine through a bottom connecting rod, and moving the upper cross beam upwards to generate a tensile load;
and 5, performing a pull-off test with the displacement speed of the cross beam being 1-2 mm/min.
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| CN107271268A (en) * | 2017-07-08 | 2017-10-20 | 中铁十六局集团置业投资有限公司 | A kind of cement base thin plate axis pulling experiment device and its test method |
| CN108918256A (en) * | 2018-05-24 | 2018-11-30 | 郑州大学 | High-hardness stainless steel fringe enhances ECC direct tensile test fixture and test method |
| CN211955007U (en) * | 2020-04-17 | 2020-11-17 | 聊城大学 | Novel concrete axial tension test device |
| CN214566237U (en) * | 2020-12-31 | 2021-11-02 | 上海航空材料结构检测股份有限公司 | Fixing device for cap-shaped straight plate wall plate structure pull-off test |
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Patent Citations (4)
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|---|---|---|---|---|
| CN107271268A (en) * | 2017-07-08 | 2017-10-20 | 中铁十六局集团置业投资有限公司 | A kind of cement base thin plate axis pulling experiment device and its test method |
| CN108918256A (en) * | 2018-05-24 | 2018-11-30 | 郑州大学 | High-hardness stainless steel fringe enhances ECC direct tensile test fixture and test method |
| CN211955007U (en) * | 2020-04-17 | 2020-11-17 | 聊城大学 | Novel concrete axial tension test device |
| CN214566237U (en) * | 2020-12-31 | 2021-11-02 | 上海航空材料结构检测股份有限公司 | Fixing device for cap-shaped straight plate wall plate structure pull-off test |
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