Cross-shaped sample for biaxial mechanical test as well as preparation method and application of cross-shaped sample

A biaxial mechanics and cross-shaped technology, which is applied in the preparation of test samples and the use of stable tension/compression to test the strength of materials, etc., can solve the problem that the cross-shaped sample and its production and test methods have not made good progress. Development, the problem of biaxial loading has not been researched much, and the results of biaxial testing are not ideal, etc., to achieve the effect of simple and easy molding process, stable test performance and simple structure

Inactive Publication Date: 2014-12-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, due to the anisotropy of the structure of the composite material itself and its weak machining characteristics, the biaxial test results are not ideal
[0005] Due to the limitation of experimental conditions in China, there has not been much research o

Method used

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  • Cross-shaped sample for biaxial mechanical test as well as preparation method and application of cross-shaped sample
  • Cross-shaped sample for biaxial mechanical test as well as preparation method and application of cross-shaped sample
  • Cross-shaped sample for biaxial mechanical test as well as preparation method and application of cross-shaped sample

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, by way of embodiment, the present invention is described in detail:

[0029] A cross-shaped sample for biaxial mechanical testing, characterized in that the sample is in the shape of a cross as a whole and has four loading arms, each loading arm is provided with a loading arm hollow area 2, and the end of the loading arm is a loading arm The arm clamping end 1 is provided with a transition area between the roots of adjacent loading arms, and the transition area is composed of a tapered transition area 3 and a circular arc transition chamfer 4;

[0030] Between the roots of the four loading arms is the central area of ​​the sample, the middle area of ​​the central area of ​​the sample is the central test area 6, and a thinning transition area 5 is provided between the central test area 6 and the root of the loading arm.

[0031] There are four loading arms, which form a cross-shaped symmetrical structure, including the clam...

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Abstract

The invention relates to a cross-shaped sample for a biaxial mechanical test as well as a preparation method and an application of the cross-shaped sample and belongs to the technical field of composite material biaxial loading tests. The whole sample is cross-shaped and comprises four loading arms, wherein each loading arm is provided with a loading arm hollow area (2), the tail end of each loading arm is a loading arm clamping end (1), and a transition area is arranged between roots of every two adjacent loading arms; a sample center area is arranged among the roots of the four loading arms, the middle area of the sample center area is a central test area (6), and a thinned transition area (5) is arranged between the central test area (6) and the roots of the loading arms. The cross-shaped sample is simple in structure and convenient to realize, stress concentration phenomena in arc transition chamfered positions of the cross-shaped sample are weaker while the central test area is higher and uniform in stress level, the biaxial stress state of the central test area is easier to realize, and initial damage occurs in the central test area.

Description

technical field [0001] The invention relates to a cross-shaped sample for biaxial mechanical testing and a preparation method thereof, belonging to the field of complex load testing of composite materials. Background technique [0002] As the most widely used composite material in engineering, fiber-reinforced composite materials are becoming more and more popular in the aerospace field. With the development and application of various advanced composite materials, the application proportion of fiber reinforced composite materials in load-bearing structures is increasing, which makes the stress state of composite materials more and more complex. Therefore, it is more and more necessary to study the strength characteristics of fiber reinforced composite materials, especially the failure characteristics under biaxial stress or multiaxial stress state, so as to ensure the safety of fiber reinforced composite material structures in use. [0003] At present, the uniaxial performa...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/08
Inventor 蔡登安周光明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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