Photoelastic-electrical measurement-DIC synchronous experiment system and method

Abstract

The invention provides a synchronous experiment system and method capable of synchronously utilizing a dynamic photoelastic method, a strain gauge electrical measurement method and a digital image correlation (DIC) method. The system comprises a flash lamp source A (1), a flash light source B (2), capacitor charger (3), polarizer A (4), a quarter-wave plate A (5), a quarter-wave plate B (6), polarizer B (7), a convex lens (8), an ultra-high-speed camera (9), an experiment loading table (10), a drop hammer (11), an impact head (12), a delay signal controller (13), strain gauges (14-15), a super-dynamic strain gauge (16), a data acquisition instrument (17), a data processing center (18), bridge boxes (19-20), ground (21), shielded wires (22-23), signal lines (24-35), a test piece (36) and aspeckle (37). According to the system, the dynamic photoelastic method, the electrical measurement method and the digital image correlation method (DIC) are effectively combined together, the dynamicfracture mechanical property of the rock material can be analyzed more comprehensively from multiple angles, multiple mechanical parameters such as a stress-strain field of crack initiation and a stress field and a displacement field of a crack tip are analyzed, and the dynamic failure rule of the rock material is summarized.

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 initiation and propagation mechanism of rock materials. Background technique [0002] In the field of civil engineering, rock is one of the more common engineering materials, and the study of the physical and mechanical properties of rock is of great significance to guide the design and construction of projects. Among them, the dynamic fracture of rock has always been a hot issue in the field of engineering design. The dynamic failure of rock materials is a variable and complex process under various conditions. Studying the failure mechanism of rock under dynamic conditions, analyzing the stress-strain field of crack initiation, the stress field and displacement field of crack tip and other mechanical parameters, and summarizing the dynamic fail...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on the dynamic fracture characteristics of rock materials at home and abroad has achieved certain results, but the dynamic fracture mechanism of rock materials before damage to complete destruction has not been fully understood.

On the one hand, rocks are affected by natural geological structures, filled with impurities, defects, joints, etc., making the fracture behavior of rock materials different from other homogeneous materials; on the other hand, using a certain experimental method alone to study the fracture damage of rock materials It is one-sided and cannot analyze the dynamic fracture mechanical properties of rock materials from multiple angles and more comprehensively

Images