Experimental study on the regularity of reverse arc crack propagation under explosive loading
In order to study the dynamic fracture characteristics of the prefabricated reverse arc crack under the blast load,a digital laser dynamic caustics line real image-virtual image integrated experimental system is used to analyze the characteristics of real and virtual image caustics spot changes at the tip of the prefabricated arc crack under the action of blast stress wave and oblique incidence blast-generated kinematic crack,the characteristics of stress intensity factor changes at the tip of the prefabricated arc crack,and the characteristics of blast-generated crack and wing crack kinematic extension.The results show that the dynamic processes of tensile-shear stress and compressive-shear stress at the crack tip can be quantitatively analyzed by the real and imaginary optical paths,and the whole process of the explosion load acting with the prefabricated arc crack can be obtained.The burst primary and secondary crack energy has a size difference,and its dynamic stress intensity factor change trend is consistent.Directional burst motion crack and prefabricated arc crack penetration position is the main reason for the variability of stress intensity factor at the upper and lower end points of the prefabricated arc crack.
万方数据
维普
