镍基合金材料塑性对应力腐蚀裂纹尖端应力应变场影响的研究

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材料工程 ›› 2011, Vol. 0 ›› Issue (5) : 17-20,25.

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镍基合金材料塑性对应力腐蚀裂纹尖端应力应变场影响的研究

薛河¹, 赵丹¹, 彭群家², 唐伟¹, 方秀荣¹, 龚晓燕¹

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Effects of Material Plasticity of Nickel Base Alloy on Stress-strain Field at Tip of Stress Corrosion Cracking

XUE He¹, ZHAO Dan¹, PENG Qun-jia², TANG Wei¹, FANG Xiu-rong¹, GONG Xiao-yan¹

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摘要

为了解材料塑性对高温水环境下核电关键结构材料应力腐蚀裂纹扩展的影响,利用大型非线性有限元软件,对镍基合金中由氧化膜和基体金属构成的应力腐蚀裂纹尖端应力应变场进行了分析,得出了材料屈服应力对应力腐蚀裂纹尖端应力应变场的影响规律。结果表明:在同样的外载条件下,随着材料屈服应力的增大,裂尖基体金属的应力增大而塑性应变减小;而氧化膜区的应力和塑性应变却同时减小。

Abstract

To understand the effect of material plasticity on stress corrosion cracking(SCC) growth in structural materials at high temperature water environments of nuclear power plants,the stress-strain field at the tip of a SCC constituted by base metal and oxide film in nickel base alloy was analyzed by elastic plastic finite element method(EPFEM) in a commercial FEM code.The effects of yield stress on the stress-strain field at the tip of the SCC were obtained.The results show that the stress in the base metal zone increases as the material yield stress increases and the plastic strain in base metal zone decreases as the material yield stress increases at the crack tip,and show that both the stress and the plastic strain in the oxide film decreases as the material yield stress increases at the crack tip.

导出引用

薛河, 赵丹, 彭群家, 唐伟, 方秀荣, 龚晓燕. 镍基合金材料塑性对应力腐蚀裂纹尖端应力应变场影响的研究[J]. 材料工程, 2011, 0(5): 17-20,25

XUE He, ZHAO Dan, PENG Qun-jia, TANG Wei, FANG Xiu-rong, GONG Xiao-yan. Effects of Material Plasticity of Nickel Base Alloy on Stress-strain Field at Tip of Stress Corrosion Cracking[J]. Journal of Materials Engineering, 2011, 0(5): 17-20,25

中图分类号： O346.1

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