As a functional composite material in aerospace engineering,the reliability of polymer bonded explosives(PBX)is related to the stability of equipment performance and safety in use,and its failure often leads to serious accidents,resulting in ca-sualties and property losses.In this paper,a two-phase composite material model composed of brittle particles-viscoelastic binder is established by the Voronoi method,which simulates the distribution of internal particles and the stochasticity of morphology,and establishes a single-particle and Voronoi representative unit(RVE)with the determined ontological parameters of each phase,and investigates the changes of acoustic characteristic parameters of ultrasonic waves in the Voronoi unit and the binder,and at a larger frequency the attenuation coefficient and sound velocity of the experimental materials were effectively predicted,and the ultrasonic nonlinear characteristics of the crack-containing model were simulated and tested to provide a theoretical basis for the subsequent ultrasonic nondestructive testing methods for PBX-like composites.
关键词
超声无损检测/高聚物粘接炸药/Voronoi方法/超声传播特性模拟
Key words
Ultrasonic nondestructive testing/Polymer bonded explosives/Voronoi method/Simulation of ultrasonic propa-gation characteristic
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