System and method for synchronous experiment of caustics-digital image correlation method

Abstract

The invention discloses a system and a method for synchronous experiment of a caustics-digital image correlation method. The system comprises a first LED (Light Emitting Diode) flashlight light source(1), a second LED flashlight light source (2), a capacitance charger (3), a first ultra-high speed camera (4), a second ultra-speed camera (5), a digital speckle image computing module (6), a causticspeckle computing module (7), an impact head (8), a drop hammer (9), a test loading platform (10), a laser light source (11), a delayed signal controller (15) of a caustics light path system and a test piece (26). The system integrates the advantages of two experiment methods, and various mechanical parameters such as the propagation length, the propagation speed and the propagation accelerationof propagating cracks can be measured; by comprehensively comparing and analyzing data measured by the two experiment methods, the propagation mechanism of the propagating cracks can be more accurately, scientifically and quantitatively researched.

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 experiment and a method for studying the mechanism of moving crack extension in the fracture process of rock materials. Background technique [0002] Rock is one of the most common materials in nature, and it is also the most commonly used material for human construction projects. Therefore, it is of great significance to study and understand the physical and mechanical properties of rock materials under different external conditions for the safety design of engineering structures. Among them, the dynamic fracture of rock has always been a research hotspot in this field. The dynamic fracture phenomenon of rock widely exists in mining engineering, environmental engineering and civil engineering construction, and is one of the causes of most geological disasters (such as earthquakes, landslides and r...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign scholars have adopted different test methods to extensively study the mechanical mechanism of crack initiation and propagation process in the process of dynamic fracture of rock materials, and have achieved certain research results, but the use of caustics method and digital image correlation Method Simultaneous study and analysis of fracture mechanics mechanism during the initiation and propagation of moving cracks in rock materials

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