Explosion loading electric measurement-dynamic photoelasticity hybrid experiment system and method

Abstract

The invention discloses an explosion loading electric measurement-dynamic photoelasticity hybrid experiment system and method. The system comprises a laser light source (1), a beam expanding mirror (2), a convex lens A (3), a polaroid A (4), a quarter-wave plate A (5), a quarter-wave plate B (6), a polaroid B (7), a convex lens B (8), a high-speed camera (9), a computer (10), an experiment loadingplatform(11), a delay and controller (12), a multi-channel pulse igniter (13), a super-dynamic strain gauge (14), a data acquisition instrument (15), a test piece (33), explosive cartridges(34), a bridge box, a signal line, a shield line and a strain gauge. The system combines the advantages of two experiment methods, can measure various mechanical parameters, such as moving crack spreading speed, crack tip region strain, dynamic stress intensity factor and dynamic fracture toughness, and can also obtain information of test piece total stress field dynamic photoelastic fringes and focal speckle series images and the like; and by comprehensively comparing and analyzing the data obtained by the two methods simultaneously, a propagation mechanism of explosion-induced moving cracks and interaction of the moving cracks during the propagation process can be studied more accurately, scientifically and quantitatively.

Description

technical field [0001] The invention relates to an experimental research method of dynamic fracture mechanics in the field of experimental mechanics research, in particular to an experimental system and method for studying the crack propagation mechanism of explosive motion. Background technique [0002] Drilling blasting, smooth blasting, and directional fracture controlled blasting techniques are widely used in open-pit mines and deep mines, road construction, tunnel and shaft excavation. However, the specific process of rock breaking by blasting has not yet been fully understood. It is generally believed that the initial cracks formed in the rock mass are caused by the explosion stress wave, and then the explosive gas penetrates into the cracks and further expands the cracks caused by the stress wave under the action of static pressure. Explosion is an extremely complicated process. The transient and destructive nature of the blasting process makes the observed blasting ...

AI Technical Summary

Problems solved by technology

[0003] At present, scholars at home and abroad have made certain research results on the change law of the stress field at the tip of the moving crack, but the research on the simultaneous analysis of the change law of the stress field at the tip of the moving crack by using the strain gauge electrical measurement method and the dynamic photoelastic method has not yet been carried out.

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