基于C/SiC复合材料大型混合型关节结构的-紧固件模型的高效强度评估方法
Maoqing Fu1, Jiapeng Chen1, Ben Wang1
1School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China.
Materials (Basel, Switzerland)
|December 17, 2024
概括
这项研究引入了一个碎形接触刚度模型,用于分析碳纤维增强碳化 (C/SiC) 复合材料中的混合关节. 新方法准确预测大规模结构的故障模式和强度,改进了航空航天设计.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 航空航天工程 航空航天工程
背景情况:
- 碳纤维增强的碳化 (C/SiC) 复合材料对于航空航天热结构至关重要.
- 由于制造复杂性和成本,混合接头是必要的,但复杂的接触行为阻碍了损坏分析.
- 现有的固体和外紧固件模型对这些关节的计算效率和应力场精度有局限性.
研究的目的:
- 开发一种计算效率高,准确的方法,用于分析C/SiC复合材料混合接头的损坏和故障.
- 建立一个碎形接触刚度模型,该模型包含结合行为,用于复杂的关节分析.
- 验证一种用于预测多行混合关节结构的故障模式和强度的新方法.
主要方法:
- 建立一个碎形接触刚度模型,考虑基于结构特征的结合行为.
- 介绍了强度外方法,以准确地描述外紧固件模型中的复杂应力场.
- 实验验证将预测结果与多行混合关节结构的实际故障模式和强度进行比较.
主要成果:
- 碎形接触刚度模型表明,结合层会影响接口强度,但在螺栓/结合混合连接中没有承载强度.
- 强度外方法有效地克服了复杂应力分析中的传统外紧固件模型的局限性.
- 经过验证的方法准确地预测了多行混合连接的故障模式和强度,错误率为5.4%,包括螺栓剪切故障.
结论:
- 开发的碎形接触刚度模型和强度外方法为设计大型C/SiC复合结构提供了坚实的基础.
- 这种综合方法提高了复杂的混合关节行为的计算效率和预测准确性.
- 这些发现对于推进C/SiC复合材料在苛刻的航空航天环境中的应用至关重要.
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