在模式I和混合模式 (I+II) 负载下的紧型张力样本上的数值疲劳裂纹生长
Rui F Martins1,2, José Xavier1,2, João Caldeira1
1UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
Materials (Basel, Switzerland)
|September 28, 2024
概括
这项研究验证了在各种负载模式下对紧张紧张 (CT) 标本的数值应力强度因子计算. 扩展有限元法 (XFEM) 有效地模拟了AISI 316L钢的疲劳裂生长.
科学领域:
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
- 计算力学 计算力学 计算力学
背景情况:
- 紧张型 (CT) 样本对于断裂力学测试至关重要.
- 准确的应力强度因子 (K) 计算对于预测材料故障至关重要.
- 了解混合模式加载效应 (模式I和II) 对现实应用至关重要.
研究的目的:
- 在纯模式I和混合模式 (I+II) 负载下对CT样本进行数值分析应力强度因子 (K).
- 为了对纯模式I加载的分析解决方案进行数值结果的验证.
- 在模式I加载下使用扩展有限元法 (XFEM) 调查疲劳裂生长.
主要方法:
- 使用Abaqus® 2022进行数值分析,以计算压力强度因子 (K).
- 将数值K值与纯模式I加载的分析解决方案进行比较.
- 使用扩展有限元法 (XFEM) 和巴黎法对AISI 316L不钢的疲劳裂生长模拟.
主要成果:
- 在纯模式I加载下,在数值和分析压力强度因子 (KI) 之间观察到出色的一致性.
- 在混合模式负载中成功获得了数值应力强度因子 (KI,KII,KIII).
- 扩展有限元法 (XFEM) 在预测裂传播方向和增长方面表现出有效性.
结论:
- 数值方法,特别是Abaqus®,为CT标本提供准确的应力强度因子计算.
- XFEM是模拟疲劳裂生长的可靠工具,取决于适当的网格精炼.
- 该研究证实了这些方法用于分析AISI 316L不钢等材料的裂纹行为.
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