使用数字图像关联技术研究离轴CFRP复合材料的疲劳损伤行为
Zhendong Zhong1, Fusheng Wang1, Fanqi Kong1
1Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, 300300, China.
Heliyon
|February 15, 2024
概括
这项研究揭示了离轴碳纤维增强聚合物 (CFRP) 复合材料中明显的疲劳失败机制. 了解拉力-拉力与压缩-压缩负荷之间的这些差异对于材料设计至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 聚合物复合材料 聚合物复合材料
背景情况:
- 脱轴碳纤维增强聚合物 (CFRP) 复合材料在循环负荷下容易受到疲劳损伤.
- 了解不同负载模式下的疲劳行为 (拉伸式-拉伸式与压缩式-压缩式) 对结构完整性至关重要.
- 以前的研究还没有完全阐明这些复合材料中独特的损伤机制和故障途径.
研究的目的:
- 为了研究和比较离轴CFRP复合材料在拉伸-拉伸和压缩-压缩负荷下的疲劳行为.
- 分析能量消耗,刚性降解和故障机制.
- 确定影响疲劳寿命和故障模式的关键参数.
主要方法:
- 在受控应力水平下对离轴CFRP复合材料进行实验性疲劳测试.
- 利用数字图像相关性 (DIC) 在现场监测裂传播和变形.
- 分析了整个疲劳寿命的能量消耗和刚度变化.
主要成果:
- 拉力-拉力疲劳:其特点是层间剪切裂,纤维/树脂解和纤维拉出.
- 压力-压力疲劳:主要由中央内膜剪切裂,纤维曲和渐进的边缘传播.
- 确定了关键的压力应变值作为压力疲劳失败的关键指标.
结论:
- 离轴CFRP复合材料在拉伸和压力负荷下表现出根本不同的疲劳损伤机制.
- 纤维屈曲在拉力-拉力疲劳性质的恢复中起着重要作用.
- 识别的临界压力应变值为预测这些材料的压力疲劳故障提供了有价值的指标.
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