Explosion-loading reflection-type caustic experimental method

An experimental method and caustics technology, applied in measuring devices, instruments, scientific instruments, etc., to achieve the effects of simple operation, easy observation and recording, and easy adjustment of the optical path

Inactive Publication Date: 2012-11-28
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in actual engineering, more non-transparent materials, such as rocks, etc., have not yet been reported in the relevant literature on the caustic line experimental method for the expansion of explosive cracks in non-transparent materials.

Method used

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  • Explosion-loading reflection-type caustic experimental method
  • Explosion-loading reflection-type caustic experimental method
  • Explosion-loading reflection-type caustic experimental method

Examples

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Embodiment 1

[0037] Taking PVC board as an example, the caustic experiment of explosive loading was carried out to test and study the propagation behavior of explosive cracks in PVC board and the stress intensity factor at the crack tip. The specific steps and process are as follows:

[0038] (a) First select a 5mm thick PVC board, cut it into a flat specimen of 200mm*200mm, use a drill to process a blasthole in the center of the cut PVC flat panel, the diameter of the blasthole is 8mm, and use a triangular file to process all groove depths A triangular groove with a grooving angle of 2mm and a grooving angle of 60°.

[0039] (b) Mirror surface transplantation is carried out above the direction of the groove, 4mm away from the center of the blast hole. The size of the holographic dry plate for transplantation is 60mm*60mm, and the thickness of the glass plate for separation is 12mm, the length is 20mm, and the width is 6mm. In the process of mirror surface transplantation, in order to pre...

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Abstract

The invention discloses an explosion-loading reflection-type caustic experimental method. Through mirror processing and grooving blasting hole design of a non-transparent material, the explosion-loading reflection-type caustic experimental method realizes accurate control of extension directions of cracks produced by explosion and then provides convenience for observation and recording of crack extension routes. Through a frame for explosive loading in a reflection-type caustic experiment, explosive loading and fixing of a test piece are stable; light path adjustment is convenient; and multi-angle and multi-direction adjustment on the test piece is realized. Under an explosion load, the explosion-loading reflection-type caustic experimental method for a non-transparent solid medium can record directly information of a stress concentration area of tips of cracks produced by explosion, and behavioral parameters of crack extension. Therefore, the explosion-loading reflection-type causticexperimental method provides favorable basis for tests of an explosion cracking mechanism and dynamic mechanical property parameters of a material.

Description

technical field [0001] The invention relates to an optical measurement mechanics experiment method in the field of dynamic fracture mechanics, in particular to an explosion-loaded reflective caustics experiment method. Background technique [0002] Dynamic fracture mechanics is a subject that studies the crack growth and fracture laws of solids under high-speed loading or high-speed crack growth conditions by using the method of continuum mechanics on the basis of considering the inertia of the loaded object. The fracture and destruction of solid materials under impact loads, especially the law of crack propagation in solid materials under ultra-dynamic loads such as explosions, belong to the research category of dynamic fracture mechanics. [0003] Blasting technology is an important construction technique in the civil construction industry. Under the action of blast loads, the dynamic fracture of objects to be blasted (rock, concrete, metal, etc.) is also the most importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/313G01N3/06
Inventor 杨仁树李清杨立云孙强岳中文
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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