Method for evaluating tearing toughness of ductile metal materials

A metal material and toughness technology, applied in the field of mechanical performance evaluation and characterization of materials, to achieve the effect of improving the evaluation test method
CN102374951BInactive Publication Date: 2013-07-24INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Publication Date
2013-07-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of mechanical property evaluation and characterization of materials, and in particular relates to a method for evaluating the tearing toughness of ductile metal materials. The method is characterized in that through carrying out a tearing test on ductile metal materials by using three-leg trouser-shaped samples, a characteristic that applied loadings in the process of tearing are unchanged is obtained, thereby providing a powerful test basis for the proposition of a tearing toughness concept, thereby obtaining a defined tearing toughness which is shown in a formula as follows: Gamma = FS / 2 t, and used for evaluating the toughness or crack propagation resistance of ductile materials. The tearing test method and the tearing toughness concept provide an effective thought for knowing an inversion relation between the strength and plasticity (toughness) of a material, therefore, a new reference criterion is provided for selecting materials (the strength and plasticity are fitted better) for actual engineering. As for ductile sheet metals, a crack propagation process and a fracture process can be described more accurately by using the tearing toughness, which has a vital significance to the evaluation and characterization of engineering applications and mechanical properties of materials.
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Description

technical field

[0001] The invention relates to the field of evaluation and characterization of mechanical properties of materials, and specifically relates to a method for evaluating the tear toughness of ductile metal materials. The tear toughness is defined by using the three-legged trousers tearing method to characterize the resistance of the material to crack propagation resistance. Background technique

[0002] The mechanical properties of ductile metal materials are mostly measured by unidirectional loading tensile tests. However, the material has high strength and is accompanied by a lack of plasticity. This inverted relationship between strength and plasticity has caused huge problems in engineering material selection. How to better achieve strong and tough cooperation has become the key to the problem, which puts forward more comprehensive requirements for the evaluation of the mechanical properties of materials. On the other hand, fracture toughness (K IC ) to ch...

Claims

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