Method for observing crack propagation path of titanium alloy under plane strain state

A technology of plane strain and crack propagation, which is used in the preparation of test samples, material analysis using measurement of secondary emissions, etc. It can solve problems such as difficulty in meeting the plane strain state, and achieve the effect of simple form and preventing instantaneous fracture.

Active Publication Date: 2013-05-15
GRIMAT ENG INST CO LTD
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Problems solved by technology

However, the thickness of the da / dN sample is thinner, and the titanium alloy has a more obvious shear deformation tendency than the steel material, and the stress state of the plane where the entire pre-crack is located is difficult to meet the plane strain state.

Method used

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  • Method for observing crack propagation path of titanium alloy under plane strain state
  • Method for observing crack propagation path of titanium alloy under plane strain state
  • Method for observing crack propagation path of titanium alloy under plane strain state

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Embodiment Construction

[0032] The invention provides a method for observing the crack propagation path of a titanium alloy under a plane strain state, and the invention will be further described below in conjunction with the accompanying drawings.

[0033] At present, the microscopic observation and analysis of the mode I crack propagation path under the plane strain condition of titanium alloy, if the plane strain fracture toughness (K IC) test specimens used in the fracture toughness test, when the loaded load reaches the maximum value, the rapid crack propagation in the titanium alloy material breaks instantly, because only the material on one side of the crack propagation path can be sampled observe, observe the effect as figure 1 As shown, it is difficult to judge whether the crack propagates in a transgranular or intergranular manner.

[0034] According to the method provided by the present invention, a new type of damage tolerance type two-phase titanium alloy Ti-62A is subjected to sample p...

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Abstract

The invention relates to a method for observing the crack propagation path of a titanium alloy under a plane strain state. The method comprises the steps of: (1) preparation of a three-point bending sample; (2) prefabrication of a cut and a fatigue crack; (3) control of plane strain condition I type crack initiation, propagation and arrest; and (4) preparation and observation of a crack propagation path micro-sample. By the method provided in the invention, the crack propagation path of the titanium alloy under a plane strain state can be observed, and simultaneously, microstructure characteristics and other information of two sides of the crack propagation path and the material around a crack tip can be acquired, so that transgranular or intergranular propagation mode of the crack can be judged accurately.

Description

technical field [0001] The invention relates to a material crack observation method, in particular to a method for observing the crack propagation path of titanium alloy under the condition of plane strain state. , slowly apply the load until the crack propagates and then unload it, cut it along the vertical direction at the centerline of the plane where the crack is located, and observe the crack propagation path on the section. Background technique [0002] Fracture is the most dangerous form of failure in engineering, which is sudden and unpredictable. The problem of material fracture, including crack initiation, propagation, and crack arrest, has always been widely concerned in engineering and academic fields. The applied load acting on the tip of the crack will result in two different stress conditions, namely, the plane strain state and the plane stress state. The theory of fracture mechanics uses the stress field intensity factor to describe the stress field at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N1/32
Inventor 刘睿惠松骁叶文君于洋付艳艳宋晓云米绪军
Owner GRIMAT ENG INST CO LTD
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