DAMAGE AND FRACTURE PROCESS OF COMPOSITE LAMINATES IMPACTED BY PROJECTILE (Ⅱ)-DAMAGE AND FRACTURE CRITERIA
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摘要: 本文对层合复合材料在冲击载荷作用下的细观损伤和宏观损伤(分层、基体开裂、纤维断裂)的破坏机理提出了一种分析模型.该模型假设材料的非线性是由于冲击过程中的细观损伤引起的,在单元本构方程中处理;采用最大应变分量准则,处理材料的宏观损伤,并考虑了相邻层(或单元)材料状态的影响,采用节点分裂的方法模拟上述宏观损伤机理.Abstract: A model is developed to express the meso-damage,macro-damages(including debond,matrix crack and fiber break) and fracture process of composite laminates impacted by a projectile.It is assumed that the nonlinearity of composites is induced by the meso-damage produced in impact process,and is considered in constitutive equations.A maximum strain criterion is presented by the authors,and can be used to analyze the maoro-damages of composites.The process of the macro-damage is simulated by the nodal separate technique.
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Key words:
- composite laminates /
- impact /
- failure criteria /
- damage mechanism /
- numerical simulation
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