结构生物尼克CFRP-Sinker螺栓组件的最终强度研究,在三点曲下进行预负荷
Zhengqi Qin1, Ying He2, Shengwu Wang1
1School of Mechanical Engineering College, Dalian Jiaotong University, Dalian 116028, China.
Biomimetics (Basel, Switzerland)
|June 27, 2023
概括
这项研究模拟了碳纤维增强塑料 (CFRP) 螺栓接头,揭示了螺栓预加载如何影响曲下的故障模式. 最佳预装载可以提高这些关键复合材料接头的最终负载能力.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 复合材料 复合材料 复合材料
背景情况:
- 反沉头螺栓接头对于连接碳纤维增强塑料 (CFRP) 是必不可少的.
- 了解曲负载下这些接头的故障模式和损伤演变对于结构完整性至关重要.
- 迟级动物的独特适应能力激发了研究物质行为的新方法.
研究的目的:
- 调查CFRP反沉螺栓接头的故障机制和损伤进展,这些接头承受曲负荷.
- 开发和验证3D有限元模型,用于预测这些组件的故障.
- 分析螺栓预负荷对应力分布和最终负载能力的影响.
主要方法:
- 开发一个3D有限元故障预测模型用于CFRP反沉螺栓组件,使用哈辛故障标准.
- 将有限元素分析 (FEA) 模型与实验数据进行比较,以确保准确性.
- 进行了参数研究,以检查应力分布和螺栓预负荷对曲极限负载的影响.
主要成果:
- FEA模拟结果与实验结果有很好的相关性,准确地反映了三点曲失败和断裂.
- 在反沉孔周围的应力分布被发现取决于层状板的方向.
- 增加螺栓预负载减少了初始损坏负载,但适当的预负载增加了最终负载能力.
结论:
- 经过验证的FEA模型有效地预测了CFRP反沉螺栓连接在曲时的故障行为.
- 螺栓预负荷显著影响CFRP接头的承载能力和故障启动.
- 优化螺栓预装是提高CFRP螺栓结构性能和耐久性的关键策略.
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