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Test piece and method for testing fracture toughness of hybrid mode of double-material interface

A fracture toughness and hybrid mold technology, applied in the direction of applying a stable bending force to test the strength of materials, can solve the problems of difficulty in making brittle materials, unsuitable for fracture toughness, etc., and achieve the effect of simple geometry

Active Publication Date: 2014-03-05
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Asymmetrical three-point bending specimens and unilateral notched four-point bending specimens have simple geometric shapes, but they can only measure fracture toughness in a small range of mixed modes; the fabrication of asymmetric four-point bending specimens is also relatively simple, but requires Special loading device; Brazilian disk specimens are widely used, but it is difficult to make some brittle materials; edge cracked strip specimens are not suitable for some brittle materials with low fracture toughness

Method used

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  • Test piece and method for testing fracture toughness of hybrid mode of double-material interface

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Embodiment

[0048] Material 1 and material 2 are two different ceramic materials combined by sintering. The Young's modulus of material 1 is 210GPa and Poisson's ratio is 0.31, and the Young's modulus of material 2 is 70GPa and Poisson's ratio is 0.27.

[0049] 1) Refer to the national standard and the nature of the specimen to select the span l =20mm, l 2 =2mm. Then, a trial calculation is carried out by displacement extrapolation method, l / w When taking different values, ψ with θ The value changes as figure 2 shown, seen, l / w The larger the value, the minimum required to achieve a 90° phase angle θ The smaller the value; a / w When taking different values, ψ with θ The value changes as image 3 as shown, a / w The larger the value, the minimum required to achieve a 90° phase angle θ The larger the value. because θ The specimen with larger value is easier to process, so it is selected by comparison l / w =1, a / w =0.5, that is w =20mm, a =10mm, and ch...

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Abstract

The invention discloses a test piece for testing the fracture toughness of a double-material interface in a hybrid mode. The test piece comprises a cuboid, wherein the cuboid consists of two first material blocks and a second material block which are combined closely in common; the two first material blocks are respectively and closely arranged at the two sides of the second material block, the closely-combined surface between one first material block and the second material block is vertical to the horizontal surface, and an included angle is formed between the closely-combined surface of the other first material block and the second material block and the horizontal surface; the combined surface forming the included angle with the horizontal surface is provided with prefabricated cracks. The invention also discloses a manufacturing method of the test piece and a test method simultaneously. The test piece and the manufacturing and testing methods disclosed by the invention have the advantages that the three-point bending test piece with a double-material inclined notch is used for testing the fracture toughness of the hybrid-mode interface, the geometrical shape of the test piece is simple, and a fracture toughness value in the range of 0-90 degrees can be obtained by adopting a three-point bending method on a common material testing machine, so that the test piece is especially suitable for fragile materials.

Description

[0001] technical field [0002] The invention relates to a test piece and a test method, in particular to a test piece and a test method for testing the mixed-mode fracture toughness of a double-material interface. Background technique [0003] With the increasing industrial application of various functional materials, composite materials, bonding materials and other advanced materials, the mechanical behavior of interfaces composed of different materials has attracted more and more attention. The joints of various materials and structures, such as metal / ceramic joint interfaces, dissimilar metal joint interfaces, and joint interfaces between functional devices and load-bearing components, have a very important impact on the overall mechanical behavior of materials or structures. Since defects or stress concentration are likely to exist near the interface, the bonded material is prone to failure first at or near the bond. Therefore, the strength and lifetime of bonded mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 张松王高琦张庆闫续范赵斌陈艳
Owner SHANDONG UNIV
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