几何拘束对镍基合金裂纹扩展速率影响的有限元分析
Finite Element Analysis on Effects of Geometric Constraints on Crack Growth Rate in Nickel-based Alloys
摘 要
裂尖拘束效应对镍基合金应力腐蚀裂纹（SCC）扩展速率有很大影响。为提高在役核电焊接接头SCC裂纹扩展速率（CGR）的预测精度，对不同拘束状态下的裂纹尖端微观力学场和表征SCC裂纹扩展速率的主要参量进行了研究，分析了试样厚度和裂纹长度这两种几何拘束条件对CGR的影响。结果表明：厚试样的SCC裂纹扩展速率更大，低载荷水平条件下，试样厚度引起的裂尖拘束效应对CGR的影响较明显；而高载荷水平条件下，不同厚度试样的裂尖拘束度趋于一致；对于两种不同的拘束条件，试样厚度引起的拘束效应对CGR的影响大于裂纹长度对其的影响。
镍基合金
裂纹扩展速率
载荷水平
constraint effect
nickel-based alloy
crack growth rate
load level
Abstract
The crack growth rate of stress corrosion cracking (SCC) in nickel-based alloys is greatly affected by the crack tip constraint effect. In order to improve the prediction accuracy of SCC crack growth rate (CGR) at the crack tip of the welded joints in service of nuclear power plants, the micro-mechanic field at the crack tip and the descriptive parameter of SCC crack growth rate under different restraint conditions were studied, the effects of geometric constraints such as specimen thickness and crack length on the crack growth rate were also analyzed. The results show that the SCC crack growth rate of thicker specimens is greater. The restraint effect on CGR at the crack tip caused by specimen thickness is more obvious with lower load level. However, the restraint intensities at crack tips of specimens with different thickness tend to be uniform with higher load level. In view of these two different constraints, the restraint effect on CGR caused by specimen thickness is greater than that caused by crack length.
中图分类号 TG174.3 DOI 10.11973/fsyfh-201809011
所属栏目 应用技术
基金项目 国家自然科学基金项目（11502195）；西安科技大学博士启动金项目（2015QDJ041）
收稿日期 2017/4/21
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引用该论文: ZHAO Lingyan,CUI Yinghao,TANG Wei. Finite Element Analysis on Effects of Geometric Constraints on Crack Growth Rate in Nickel-based Alloys[J]. Corrosion & Protection, 2018, 39(9): 704
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【5】DODDS JR R H,SHIH C F,ANDERSON T L. Continuum and micromechanics treatment of constraint in fracture[J]. International Journal of Fracture,1993,64(2):101-133.
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【8】何滨,刘军,陈建恩,等. 不同拘束条件下P92钢高温蠕变裂纹扩展速率的有限元模拟[J]. 材料导报,2016,30(16):145-149.
【9】谈建平,王国珍,轩福贞,等. 紧凑拉伸试样厚度对25Cr2NiMo1V钢高温蠕变裂纹扩展速率的影响[J]. 机械工程材料,2012,36(10):42-46.
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【12】ANDRESEN P L,PETER FORD F. Life prediction by mechanistic modeling and system monitoring of environmental cracking of iron and nickel alloys in aqueous systems[J]. Materials Science and Engineering:A,1988,103(1):167-184.
【13】PENG Q J,KWON J,SHOJI T. Development of a fundamental crack tip strain rate equation and its application to quantitative prediction of stress corrosion cracking of stainless steels in high temperature oxygenated water[J]. Journal of Nuclear Materials,2004,324(1):52-61.
【14】SHOJI T,LU Z,MURAKAMI H. Formulating stress corrosion cracking growth rates by combination of crack tip mechanics and crack tip oxidation kinetics[J]. Corrosion Science,2010,52(3):769-779.
【15】JR M M H. An alternative to the SHOJI crack tip strain rate equation[J]. Corrosion Science,2008,50(10):2902-2905.
【16】LU Z,SHOJI T,TAKEDA Y,et al. Transient and steady state crack growth kinetics for stress corrosion cracking of a cold worked 316L stainless steel in oxygenated pure water at different temperatures[J]. Corrosion Science,2008,50(2):561-575.
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