Method for testing type-II fracture energy of bonded interface
A test method and fracture energy technology, applied in the direction of using stable tension/pressure to test the strength of materials, etc., can solve the problems of unavoidable geometric structure, difficulty in eliminating energy dissipation, lack of effective methods, etc.
Active Publication Date: 2014-12-03
GUANGSHA CONSTR GROUP +1
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Problems solved by technology
Existing methods have been able to accurately measure the fracture energy of mode I fracture at the bonded interface, but there is still a lack of effective methods for the determination of the fracture energy of pure mode II fracture at the bonded interface
The reason is mainly that the geometric structure and corresponding loading conditions of the existing test methods are difficult to avoid the additional type I component in the test, and it is difficult to rule out the energy dissipation caused by other reasons in the test
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Embodiment Construction
[0022] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments.
[0023] Measure the type II fracture energy of the bonding interface between material A and material B, where the tensile-compression strength ratio of material A on the side where the load is applied is greater than 1.
[0024] 1) Use material A and material B to make the first test piece and the second test piece, such as figure 1 Shown.
[0025] The length of the cuboid of material A in the first specimen is c 1 , The thickness is b, the height is h; the length of the cuboid of material B is c 2 , The thickness is b, the height is h; the bonding interface length is b, and the width is h. Among them, the length of the cuboid block of material A (c 1 ) And the length of the cuboid block of material B (c 2 ) Satisfy relation: E 1 c 1 = E 2 c 2 , E 1 And E 2 These are the tensile modulus of material A and materi...
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The invention provides a method for testing type-II fracture energy of a bonded interface. The method comprises the following steps: respectively preparing a first test piece with a bonded interface and a second test piece with the same bonded interface and a prefabricated crack on the interface, performing semi-side stretching test or semi-side compression test respectively on the first test piece and the second test piece to acquire a load-displacement curve, and calculating according to the acquired curve to obtain the type-II fracture energy of the bonded interface. According to the test method, other type fracture components of the bonded interface which can occur in the test process can be effectively avoided; moreover, the influence of the energy dissipation caused by other reasons on the test result can be eliminated, and the pure type-II fracture energy of the bonded interface can be precisely tested.
Description
Technical field [0001] The present invention relates to the technical field of material detection, in particular to a method for testing type II fracture energy of different material interfaces. Background technique [0002] The bonding interface of the material has a very important influence on the mechanical behavior of the material or the structure as a whole. Due to defects or stress concentration near the interface, the material is likely to be damaged first at or near the bonding interface. With the increasing application of advanced materials such as composite materials and functional materials, the mechanical behavior of interfaces composed of different materials, especially the fracture properties, has attracted more and more attention. [0003] Similar to homogeneous materials, bonding interface fractures are also divided into three types, namely, open type (Type I), slip type (Type II) and tear type (Type III). Fracture energy is defined as the work done by the externa...
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IPC IPC(8): G01N3/08
Inventor 李庆华卢振华徐世烺尹友成李智慧黄博滔
Owner GUANGSHA CONSTR GROUP