DAMAGE AND FRACTURE PROCESS OF COMPOSITE LAMINATES IMPACTED BY PROJECTILE(Ⅰ)——NUMERICAL ANALYSIS
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摘要: 基于连续损伤力学,对弹丸冲击复合材料多层板靶的变形-损伤过程给出了必要的基本方程,进行了三维有限元分析.将靶板处理为具有材料各向异性和结构非均匀性;冲击引起的微损伤是各向异性的,造成材料的非线性;冲击造成的局部大变形,构成几何非线性.宏观损伤(包括层内基体开裂、纤维断裂和层间分层)在有限元分析中用节点分裂法处理.钢质弹丸假设是线弹性的,不考虑它在冲击过程中的损伤.计算结果表明,采用本文中提出的方法,能较好地模拟复合材料层合板受弹丸冲击时的损伤、变形过程.Abstract: Based on continuum damage mechanics, the deformation and damage process of composite laminates impacted by projectile were studied theoretically. The basic equations for this simulation were then derived. The composites are of anisotropy and nonhomogeneity, the micro-damage induced by impact is anisotropic and results in nonlinearity of materials, and the local large-deformations of target construct geomet rical nonlinearity. The macro-damages which include cracking of matrix, fibers fracture within lamina and inter face debonded as well are treated by the nodal division for finite element analysis. The projectile made of steel is assumed to be linear elastic and its damage in the impact process is not taken into account. The theory used in this paper can simulate the process of damage and deformation of composite laminates impacted by projectile.
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Keywords:
- composite laminates /
- continuum damage mechanics /
- impact /
- numerical analysis
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