| Abstract Scope |
Analyzing the deformation and damage processes of high particle volume fraction composites (HPVFCs) through meso-structure modeling is crucial for understanding their service life and functional reliability. The mesoscopic structural models reported typically assume ideal conditions without initial damage and are applicable to composites with a particle volume fraction of less than 80%. This study provides a new mesoscopic structure model called aggregate settlement-merging model to simulate the mechanical behavior and damage mechanism of the polymer-bonded explosive (PBX) under quasi-static loads, The macroscopic response is accurately predicted by the cohesive finite element method. The simulation accurately predicts failure modes such as interface debonding, binder filament rupture, and grain failure, consistent with observations from micromechanical experiments. A quantitative multi-scale relationship between macroscopic mechanical properties and microscopic initial interface damage is established using an exponential function. This study elucidates the relationship between meso-structures and performance, offering insights for designing next-generation high-performance HPVFCs. |