孔径对轴向压缩CFRP层材中故障负荷和变形模式的影响
1Department Machine Design and Mechatronics, Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel, Switzerland)
|August 14, 2025
概括
碳纤维增强聚合物 (CFRP) 复合板中的孔在轴向压缩下显著改变了行为. 孔的存在导致局部变形,并将承载能力降低高达30%,影响结构设计.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 结构分析 结构分析
背景情况:
- 碳纤维增强聚合物 (CFRP) 复合材料是用于各种结构应用的先进材料.
- 了解带有切片的复合板的机械行为对于结构完整性至关重要.
- 轴向压缩是薄壁结构的常见负载场景.
研究的目的:
- 为了研究中心孔存在和尺寸在轴向压缩下对CFRP复合板的影响.
- 分析故障机制和负载能力与孔的几何关系.
- 为设计具有技术开口的复合材料组件提供数据,并验证数值模型.
主要方法:
- 八层对称层状CFRP板的自闭体制造.
- 测试具有0毫米,2毫米,4毫米和8毫米直径的中心孔的板.
- 使用通用测试机和数字图像相关性 (DIC) 进行非接触式变形测量.
- 双重测量方法 (基于机器和基于DIC) 来评估边界条件效应.
主要成果:
- 孔的存在会在切出的周围引起局部变形.
- 故障模式因中心孔的存在和大小而改变.
- 观察到负载能力的非线性降低,最大孔的负载能力降低了约30%,最大孔的负载能力降低了约30%.
- 负载偏移和负载缩短曲线显示,由于漏洞造成的显著变化.
结论:
- 洞对CFRP板块的轴向压缩行为产生重大影响.
- 这些发现为设计带有切片的复合结构提供了宝贵的见解.
- 实验数据作为一个可靠的参考验证复合行为计算模型的有效性.
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