CAJ | 학술논문

本文讨论了在强动载荷作用下的颗粒增强高聚物中的损伤演化规律.文中首先介绍了由本文作者最近提出来的关于粒子填充高聚物的本构关系.然后研究了在平板撞击下的一维应变波的传播和衰减特性.本文基于细观力学方法研究了介质中微损伤的演化.拉应力波的作用将可能导致由于界面脱粘引起的微损伤成核,已经成核的微损伤(微孔洞)的长大与汇合将最终造成材料的动态失效.研究表明,影响微损伤演化的因素有:粒径分散度,平均粒径和界面粘结能等.然而,与准静态加载不同,在动态条件下,以上这些因素对损伤演化的影响并不十分明显.理论分析的结果是:材料的层裂破坏强烈地依赖于飞片对靶板的撞击速度.最后,本文还根据损伤演化的特征建议了一个关于粒子填充高聚物的层裂准则.
본문토론료재강동재하작용하적과립증강고취물중적손상연화규률.문중수선개소료유본문작자최근제출래적관우입자전충고취물적본구관계.연후연구료재평판당격하적일유응변파적전파화쇠감특성.본문기우세관역학방법연구료개질중미손상적연화.랍응력파적작용장가능도치유우계면탈점인기적미손상성핵,이경성핵적미손상(미공동)적장대여회합장최종조성재료적동태실효.연구표명,영향미손상연화적인소유:립경분산도,평균립경화계면점결능등.연이,여준정태가재불동,재동태조건하,이상저사인소대손상연화적영향병불십분명현.이론분석적결과시:재료적층렬파배강렬지의뢰우비편대파판적당격속도.최후,본문환근거손상연화적특정건의료일개관우입자전충고취물적층렬준칙.
The microdamage evolution in a particle-filled polymer under dynamic loading is studied in this paper.Firstly, the constitutive relation of this particle filled polymer recently proposed by the present authors is introduced. Then, the propagation of one-dimensional strain wave caused by the plate impact is investigated, and the attenuation of stress wave is evaluated. Thirdly, the evolution of the microdamage is theoretically studied by using a micromechanical method. When the tensile wave appears in the material, the microdamage nucleation may take place due to the debonding of the interface between the second phase particles and the matrix. The growth and coalescence of these microvoids lead to the dynamic failure of the material. It is shown that the microdamage evolution is influenced by several factors, such as the particle size-dispersity, the average radius of particles, and the adhesive energy of the interface. However, different from static conditions, the effect of these factors on the microvoids evolution under dynamic conditions is not remarkable. The theoretical analysis indicates that the spallation of the material is strongly influenced by the impact velocity of the projectile. Finally, according to the characteristics of the damage evolution, a spallation criterion for a particle-filled polymeric material is proposed.