一个相场有限元素研究和评估硫化物应力裂变在DCB样品测试中的硫化物应力裂变
Alok Negi1, Mohamed Elkhodbia1, Imad Barsoum1,2
1Department of Mechanical and Nuclear Engineering, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates.
Heliyon
|December 6, 2024
概括
本研究以数值模拟NACE双杆束 (DCB) 测试,以了解硫化 (H2S) 如何导致金属裂变. 它揭示了影响石油和天然气设备安全的断裂性预测的关键测试参数.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 断裂力学 断裂力学 断裂力学
背景情况:
- 含硫化 (H2S) 的酸性环境对石油和天然气勘探中使用的材料构成重大挑战.
- 下孔设备中的金属和合金容易受到环境辅助裂解 (EAC),特别是硫化物应力裂解 (SSC).
- 通过测量H2S环境中的断裂性,NACE双杆束 (DCB) 测试对于评估EAC电阻至关重要.
研究的目的:
- 在DCB测试中数值调查各种测试参数对断裂性预测的影响.
- 在DCB标本中模拟硫化物应力裂变 (SSC),使用合变形-扩散相场框架.
- 为了更深入地了解影响裂生长和DCB测试期间逮捕的因素.
主要方法:
- 一个合变形-扩散相场框架被用来模拟SSC.
- 进行了DCB测试的数值模拟,改变了关键参数,如臂位移和初始口.
- 该研究的重点是材料变形,扩散和断裂之间的复杂相互作用.
主要成果:
- 数字结果与现有实验数据有很好的一致性.
- 模拟提供了有关不同测试参数如何影响断裂性 () 预测的详细见解.
- 在DCB测试中确定了影响裂纹生长和逮捕的关键因素.
结论:
- 数值模型准确地捕捉了SSC现象在DCB标本.
- 了解测试参数的影响对于可靠的断裂性评估至关重要.
- 这项研究提高了材料在H2S丰富环境中的结构完整性评估,这对石油和天然气安全至关重要.
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