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总览 评价 白晓明 ， 果立成 * ， 沈日麟 （ 哈尔滨工业大学航天学院航天科学与力学系，哈尔滨 150001； ） 摘要： 含能颗粒填充非均匀材料在国防、航天等领域有重要的应用价值。在这类材料中，"热点"的形成以及其导致的意外起爆一直是一个难点问题。因为该
白晓明， 果立成*， 沈日麟
（
哈尔滨工业大学航天学院航天科学与力学系，哈尔滨 150001； ）
摘要：
含能颗粒填充非均匀材料在国防、航天等领域有重要的应用价值。在这类材料中，"热点"的形成以及其导致的意外起爆一直是一个难点问题。因为该类材料的细观结构复杂，传统的简化模型很难在细观尺度上真实的模拟出材料的损伤演化与热点的形成过程。而热点的形成主要是因为材料的非均匀性导致的能量分布非均匀而引起的。因此在细观尺度上建立真实模型来模拟损伤演化过程将是分析热点产生的基础研究。本文提出了一种基于数字图像滤波与边界光滑算法的有限元建模方法，在模型中内嵌的不同类型的内聚力单元可以从细观尺度上反映出材料的损伤过程。利用上述模型，以PBX炸药为例研究了在拉伸载荷作用下材料内部的不同损伤形式。
关键词：
固体力学；颗粒填充材料；损伤演化；内聚力模型；PBX
BAI Xiaoming， GUO Licheng*， SHEN Rilin
（
Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001； ）
Abstract：
As particle reinforced composites are increasingly used in engineering during the past decades and these composites contain extremely arbitrary microstructure, how to build a flexible model to analyze the damage and failure of these materials and which are principal factors to reflect macro-performance in micro scale become major issues.
This paper describes a simple modeling method and a potential-based cohesive finite element method for the analysis of these particle reinforced composites under complicated impact loading. The microstructures of this model can be modified easily to characterize different microstructures in the composites without the remesh of existing elements. Potential-based cohesive elements are implemented to describe variety of damage and fracture in the composite (i.e., matrix/particle debonding, crack in particles, failure of the matrix). Also, an effective multiscale model is used to connect the macro impact process and the micro damage process. Consequently, a numerical example is given with polymer matrix, which is described by a viscoelastic constitutive formulation, and elastic particles with arbitrary initial microcracks.
The model is sufficiently flexible in terms of building different microstructures, describing varietal damage and importing out-calculated impact loading. Furthermore, the study is useful for the design and assessing the performance of particle reinforced composites.
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