Influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip in particulate-reinforced composites
Influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip in particulate-reinforced composites
复制标题
颗粒尺寸和脱粘损伤对颗粒增强复合材料裂纹尖端周围弹塑性奇异场的影响
DOI：
10.1007/s00707-013-1052-6
复制
发表时间：
2014
期刊：
影响因子：
2.7
通讯作者：
Y. Shimamura
中科院分区：
文献类型：
--
作者：
K. Tohgo;T. Fujii;D. Kato;Y. Shimamura
本文研究了颗粒增强复合材料中颗粒尺寸和脱粘损伤对裂纹尖端弹塑性奇异场的影响。对含不同尺寸颗粒、脱粘损伤的钢筋混凝土裂纹尖端场进行了有限元分析。有限元方法是在Tohgo等人建立的混凝土细观力学模型基础上发展起来的。(Compos Part A 41：313-321,2010)，它可以描述颗粒与基质的脱粘损伤以及颗粒尺寸对变形和损伤的影响。基于数值结果，讨论了颗粒尺寸和脱粘损伤对裂纹尖端弹塑性奇异场的影响。在复合材料中，裂纹尖端的应力分布随着颗粒尺寸的减小而向上移动，除非发生脱粘损伤。在有损伤的复合材料中，脱粘损伤发生在裂纹尖端，并在裂纹尖端之前进行。应力分布在损伤区向下移动。结果表明，裂纹尖端场受颗粒尺寸和脱粘损伤的影响较大。
This paper deals with the influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip in particulate-reinforced composites (PRCs). Finite element analysis has been carried out on a crack-tip field in PRCs with debonding damage and containing various sized particles. The finite element method is developed based on a micromechanics model of PRCs by Tohgo et al. (Compos Part A 41:313–321, 2010) which can describe the debonding damage of particles from matrix and the particle size effect on deformation and damage. The influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip is discussed based on the numerical results. The stress distribution ahead of a crack-tip in the composites shifts upward with decreasing particle size unless the debonding damage develops. In the composites with damage, the debonding damage occurs from a crack-tip and progresses ahead of a crack-tip. The stress distribution shifts downward in the damage zone. It is concluded that the crack-tip field is strongly affected by the particle size and debonding damage.