| 复合材料层板低速倾斜冲击损伤分析 |
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| 引用本文： | 张超,刘建春,方鑫.复合材料层板低速倾斜冲击损伤分析[J].北京航空航天大学学报,2022,48(12):2388-2397. |
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| 作者姓名： | 张超 刘建春 方鑫 |
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| 作者单位： | 江苏大学 机械工程学院, 镇江 212013 |
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| 基金项目： | 江苏省自然科学基金BK20180855机械结构力学及控制国家重点实验室开放课题MCMS-E-0219Y01 |
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| 摘 要： | 纤维增强复合材料层板对低速冲击事件敏感，冲击产生的损伤会导致材料结构承载性能及使用寿命大幅下降。基于此，提出了一种基于连续介质损伤力学的有限元模型，研究了复合材料层板低速倾斜冲击力学行为。采用Hashin准则结合渐进退化模型预测层内损伤起始和演化；采用界面单元结合双线性Traction-Separation本构关系模拟层间分层；编写用户材料VUMAT子程序，实现基于ABAQUS/Explicit软件平台的数值求解。数值计算结果与现有正冲击下实验数据吻合较好，验证了模型的有效性。探讨了冲击角度、冲击能量对复合材料层板倾斜冲击力学性能的影响，分析倾斜冲击下层板损伤模式及失效机理，为复合材料结构倾斜冲击问题数值分析提供参考。
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| 关 键 词： | 复合材料层板 低速冲击 倾斜冲击 损伤 数值模拟 |
| 收稿时间： | 2021-03-29 |
Damage analysis in composite laminates under low velocity oblique impact |
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| Affiliation: | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | Fiber reinforced composite laminates are sensitive to low velocity impact events, and the induced damage extensively reduces the load-bearing capacity and service life of composite structures. A continuum damage mechanics based finite element model is proposed to investigate the mechanical behavior of composite laminates under low velocity oblique impact. The Hashin criteria and a gradual degradation model are employed to predict the intra-laminar damage initiation and evolution; cohesive elements ruled by the bilinear Traction-Separation constitutive relation are applied to simulate delamination. A user material subroutine VUMAT is then developed and implemented to obtain the numerical solution based on ABAQUS/Explicit solver. The numerical results are largely consistent with the available experimental data under normal impact, thus validating the effectiveness of the proposed model. The effects of the impact angle and impact energy on the oblique impact properties of composite laminates are discussed and the damage mode and failure mechanism are analyzed in detail, providing insight into the numerical study on general oblique impact problems in composite structures. |
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