短纤维增强聚合物结构在低速冲击下的机械行为和反应机制
Xinke Xiao1, Penglei Wang2, Anxiao Guo2
1Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures, Nanyang Institute of Technology, Nanyang 473004, China.
Materials (Basel, Switzerland)
|August 14, 2025
概括
这项研究介绍了短纤维增强聚合物 (SFRP) 在冲击下的3D模型. 它揭示了纤维含量如何影响动态响应和故障模式,这对于设计坚固结构至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算力学 计算力学 计算力学
背景情况:
- 短纤维增强聚合物 (SFRP) 由于其高强度与重量比在结构工程中至关重要.
- 了解SFRP在中等拉伸率下的机械行为对于高级应用至关重要.
- 现有的模型往往缺乏微观结构特征的详细整合,如接口和孔隙.
研究的目的:
- 开发和验证SFRP创新的3D多尺度构成模型.
- 研究3D打印SFRP多孔结构在冲击下的动态反应和损伤演变.
- 阐明纤维体积分数和拉伸率对机械性能和故障机制的影响.
主要方法:
- 开发一个包含光纤矩阵接口和孔隙效应的3D多尺度构成模型.
- 实验测试3D打印的SFRP多孔结构 (25%,35%,45%体积分数) 使用落撞击.
- 多尺度数值模拟分析动态响应,损伤演变和故障模式.
主要成果:
- 延展率的增强是低纤维含量 (25%) 的关键,而较高的含量 (45%) 显示了复杂的相互作用.
- 对于25%的SFRP,特定能量吸收率 (SEA) 随着应变率的增加而增加,但对于较高的分数,能量吸收效率 (EAE) 不单调地变化.
- 主要的故障模式是剪切主导的压缩,损坏复杂性和故障模式随纤维含量而演变.
结论:
- 拟议的3D多尺度模型准确地预测了SFRP在冲击下的行为.
- 纤维体积分数显著影响拉伸率效应和损伤演变之间的相互作用.
- 了解剪带启动和传播对于SFRP的结构不稳定性至关重要,为抗冲击设计提供了信息.
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