Method and device for measuring dynamic fracture property of laser shock loading material

A technology of laser shock and measurement method, which is applied in the direction of measuring devices, analyzing materials, strength characteristics, etc., can solve the problems of large size, insufficient height, and more material waste, and achieve the effect of improving loading rate and reliable fracture characteristics
CN101975703AInactive Publication Date: 2011-02-16JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2011-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for testing mechanical property of a material under the action of stress wave, in particular to a method and a device for measuring dynamic fracture property of a laser shock loading material. The method comprises the following steps of: loading a three-point bent sample (4) with preformed crackles (1) by using shock wave induced by nanosecond-scale laser pulse (8), and detecting the propagation property of the stress wave (17) in the three-point bent sample (4) and the expansion property of the crackles by adopting a method of combining photo-elasticity and moire. The device acquires a high-speed transient photo-elastic image of interaction of the material and the stress wave under the condition of a high loading rate by using a multi-spark camera optical system (13), can clearly observe the propagation of the laser-induced short pulse stress wave (17), and can accurately and reliably acquire the fracture property of the material by processing.
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Description

technical field

[0001] The invention relates to a test method for the mechanical properties of a material under the action of a stress wave, in particular to a method and a device for measuring the dynamic fracture properties of a laser shock loaded material. Background technique

[0002] The dynamic fracture toughness (dynamic crack initiation toughness) of the material is an important parameter of the dynamic characteristics of the material, which is the limit value of the dynamic stress intensity factor of the cracked body under the action of dynamic load, and is the toughness parameter of the material. As a material parameter in modern damage tolerance design, it can make up for the basic material parameters (K IC , J IC ) does not consider the effects of inertia and loading rate, and cannot predict the safety of materials and structures under dynamic loads.

[0003] The two most important aspects of testing for the measurement of dynamic fracture properties are loadin...

Claims

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