在易碎材料中的热力学断裂中对周动力学损伤的新定义
1Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China.
Materials (Basel, Switzerland)
|January 28, 2026
概括
本研究介绍了一种先进的热力学断裂模型,将经典连续力学 (CCM) 和周动力学 (PD) 结合起来,用于准确的热故障分析. 增强的周动力学损伤定义捕捉了定向键断裂,改进了热断裂模拟.
科学领域:
- 计算力学是计算力学.
- 材料科学是一种材料科学.
- 热传递是一种传递热量的过程.
背景情况:
- 热失效是工程应用中的一个关键问题.
- 经典连续力学 (CCM) 与不连续性作斗争,而周动力学 (PD) 提供了一个强大的替代方案.
- 现有的PD模型缺乏详细的损伤分布分析,限制了骨折模拟的准确性.
研究的目的:
- 为分析热失效而开发一个合CCM/PD的热力学断裂模型.
- 提出一种新的PD损害定义,其中包括债券分配,以提高准确性.
- 为了验证模型的有效性,并证明其在模拟复杂的热裂折的能力.
主要方法:
- 一种混合CCM/PD方法,使用有限元离散用于合的热和机械分析.
- 开发一种新的周动力学损害度量,考虑断裂键数和它们的空间分布.
- 在热传导的CCM和不连续变形的PD之间替代解决方案策略.
主要成果:
- 拟议的模型准确地捕捉了热断裂的启动和传播.
- 增强的PD损害定义成功解释了定向债券断裂.
- 对分析解决方案进行验证的数值示例证实了模型的有效性.
- 对热冲击场景的模拟证明了该模型能够分析复杂的断裂机制.
结论:
- 结合CCM/PD模型为模拟热力学断裂提供了一个强大的工具.
- 精细的PD损伤定义提高了热裂模拟的现实性和准确性.
- 这种方法有助于更深入地了解工程材料中的热失效现象.
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