对受热疲劳负荷影响的聚合物材料的损坏和故障进行数值模拟
Jun Koyanagi1, Takumu Sugiyama2, M J Mohammad Fikry3
1Department of Materials Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Polymers
|May 14, 2025
概括
这项研究提出了一种新的数值方法来模拟由热疲劳引起的聚合物故障. 该方法准确地模拟了损伤的进展,减少了对材料设计进行广泛实验的需求.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算力学 计算力学 计算力学
背景情况:
- 热疲劳对聚合物材料的耐用性构成重大挑战.
- 现有的研究主要依赖于实验方法,由于复杂性,可用的数值模拟有限.
- 建模热疲劳需要考虑合的热力学现象和材料降解.
研究的目的:
- 开发和验证一种新的数值方法来模拟受热疲劳影响的聚合物中的损坏积累和故障.
- 建立基于的损坏标准,用于预测循环热负荷下材料故障.
- 提供一个计算框架,补充实验研究和助力聚合物设计.
主要方法:
- 采用合模拟方法,模拟来自热膨胀不匹配和温度梯度的热力和机械应力.
- 在ABAQUS中实现了一个粘弹性构成方程,使用用户定义的子程序来捕捉损伤进展.
- 模拟包括通过降低粘度的表面和内部导热,热变形和时间-温度叠加.
主要成果:
- 由温度梯度驱动的局部热应力被证明会导致聚合物材料的逐渐损坏和最终故障.
- 数字框架成功模拟了热疲劳引起的损伤,证明了其预测材料行为的能力.
- 该研究强调了温度梯度在启动和传播损害方面发挥的关键作用.
结论:
- 这项工作首次成功地对聚合物中热疲劳引起的损伤进行了数值模拟.
- 开发的框架为聚合物残余应力预测和耐久性评估提供了宝贵的见解.
- 这种方法可以显著减少对广泛实验测试的依赖,加速高性能应用的聚合物设计.
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