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A high-temperature tensile test device and method for a three-dimensional braided composite material

A composite material, tensile test technology, applied in the direction of measuring device, analyzing material, using stable tension/pressure test material strength, etc., can solve problems such as crushing, test piece fracture, test failure, etc. The effect of increased contact area and simple body structure

Inactive Publication Date: 2021-03-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the tensile test of three-dimensional woven carbon / carbon composite materials, plate test pieces are mostly used. Due to the poor transverse stiffness and strength of carbon / carbon composite materials, it is necessary to attach a reinforcement sheet at the clamping end, and the glue used for bonding the reinforcement sheet The working temperature is within 300°C. When the temperature rises, the glue softens and the bonding strength decreases. When performing a tensile test, it is very easy to produce "degumming" at the clamping end, and the clamping force at the clamping end is not easy to control. , during the tensile test, it is very easy to cause local damage or "crushing" of the clamping end, which will cause the root of the test piece to break and lead to the failure of the test
However, the tensile strength and modulus of three-dimensional braided composites require high fiber integrity
[0006] Due to the limitation of the clamping scheme, the current domestic and foreign methods for testing the mechanical properties of high-temperature braided composite materials are to process the clamping end of the test piece into a dovetail shape, and connect the test piece to the testing machine through a special fixture. This method can ensure During the stretching process of the test piece, the clamping end did not slip or fail, but at the same time, the integrity of the material fibers was also destroyed, and the damage mode of the material changed from the original fiber tensile and shear failure to fiber pull-out damage, causing the mechanical properties of the material to be significantly lower than the true value of the material

Method used

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  • A high-temperature tensile test device and method for a three-dimensional braided composite material
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  • A high-temperature tensile test device and method for a three-dimensional braided composite material

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[0031] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0032] A high-temperature tensile test device for three-dimensional braided composite materials, used for high-temperature tensile tests on test pieces 1 of three-dimensional braided composite materials, including a specific test piece and supporting special fixtures, such as figure 1 As shown, the special test piece is a plate test piece, and the test piece 1 consists of a dovetail-shaped clamping section 11 , a transition section 12 and a middle test section 13 from...

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Abstract

The invention discloses a three-dimensional braided composite material high-temperature tensile test device and method, a special test piece and a special fixture, the special test piece includes a dovetail-shaped clamping end and a middle arc test section; Blocks, outer blocks, ring retaining rings and fastening bolts, etc. Among them, the special test piece is installed on the fixture chuck, and then the middle pad of appropriate thickness is attached to the clamping end of the test piece, and then the middle pad is pressed tightly with the outer stopper, and finally the whole is fastened by the ring retaining ring and the bolt . The invention has a simple overall structure and is easy to process, and is applicable to tensile tests of various high-temperature-resistant composite materials such as carbon base, ceramic base and metal base.

Description

technical field [0001] The invention relates to a high-temperature tensile test method for a three-dimensional braided composite material, in particular to a tensile test method for a three-dimensional braided carbon / carbon composite material in an ultra-high temperature environment. Background technique [0002] Carbon / carbon composite material is a new type of high-temperature material with excellent mechanical properties. It has high strength, can maintain high strength in an ultra-high temperature environment, and has good ablation performance. Therefore, it is widely used in aerospace, medical, automobile, ship and other fields. get important applications. The three-dimensional weaving process has the characteristics of multi-directional fiber orientation and overall continuous distribution, so that the composite material synthesized by the three-dimensional fabric has excellent impact damage resistance, mechanical properties and ablation resistance. It overcomes many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/18G01N3/04
Inventor 温卫东陈波吴福仙翁晶萌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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