在prepreg中使用多余的树脂来实现在合并混合材料时的良好性能
Nawres J Al-Ramahi1,2, Safaa M Hassoni2, Janis Varna1,3
1Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden.
Polymers
|June 27, 2025
概括
选择合适的粘合剂和层厚度对于强大的碳纤维增强聚合物复合材料 (CFRP) 对于钢接头至关重要. 较厚的硬化环氧显著提高了与薄型预树脂相比的断裂性.
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:
- 复合金属结构的粘合粘合对于轻量化设计至关重要.
- 了解混合关节的断裂性对于性能和安全至关重要.
- 优化碳纤维增强聚合物复合材料 (CFRP) 和钢材之间的接口是一个持续的挑战.
研究的目的:
- 在模式I和II负载下评估CFRP-钢粘合剂接头的断裂性.
- 为了比较两个不同的粘合剂系统的性能:prepreg过剩树脂和结构性环氧.
- 为了研究粘合剂层厚度和钢材表面处理对关节完整性的影响.
主要方法:
- 使用了线性弹性断裂力学 (LEFM) 的原理.
- 采用了经过修改的双悬臂梁 (DCB) 和末端纹曲 (ENF) 样品配置.
- 在未涂层和Al-Si涂层钢上测试的连接用薄的预制材料树脂层和厚厚的Sika Power-533结构环氧层.
主要成果:
- 厚厚的Sika Power-533粘合剂增加了临界能量释放率高达30倍,与薄型 prepreg树脂相比.
- 使用厚厚的Sika粘合剂的关节显示出一致的性能,在复合材料/粘合剂接口上失败.
- 薄的预制材料树脂层对未涂层钢的粘附性很差,在树脂/钢接口上失败.
结论:
- 粘合剂的选择和层厚度对于实现强大的CFRP-钢粘合剂接头至关重要.
- 结构性环氧体具有显著增强的断裂性,特别是在更厚的层.
- 接口的最弱环节决定了关节的故障,强调了需要量身定制的粘合剂策略.
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