预压缩量对裂尖蠕变特性的影响
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摘要
针对核电管道在高温高压环境下工作会产生残余应力和发生蠕变,并造成裂尖力学场的变化,最终对裂纹扩展产生影响。利用ABAQUS有限元分析软件采用预压缩的方法将残余应力引入裂尖区域,在不同的预压缩量下对裂尖处蠕变应力、应变场和蠕变率进行分析。结果表明:随预压缩量增大,裂尖区域的应力、应变、蠕变率都增大,高蠕变区主要集中在裂纹扩展方向上。本文的研究结果可对核电结构材料安全评价和寿命预测提供新思路与依据。
Aiming at the change of crack tip mechanical field induced by residual stress and creep which happens in nuclear power pipeline serving at high temperature and high pressure, at last, the propagation of the crack was affected. The residual stress was introduced to crack tip field by pre-compression method using finite element analysis software ABAQUS.The creep stress, strain field and creep rate in crack tip were analyzed at different amounts of pre-compression. The results show that the stress, strain and creep rate at the crack tip increase with pre-compression increasing. High creep zone mainly locates in the crack growth direction. The research results in the paper can provide new ideas and basis for the safety evaluation and life prediction of nuclear structural materials.
Aiming at the change of crack tip mechanical field induced by residual stress and creep which happens in nuclear power pipeline serving at high temperature and high pressure, at last, the propagation of the crack was affected. The residual stress was introduced to crack tip field by pre-compression method using finite element analysis software ABAQUS.The creep stress, strain field and creep rate in crack tip were analyzed at different amounts of pre-compression. The results show that the stress, strain and creep rate at the crack tip increase with pre-compression increasing. High creep zone mainly locates in the crack growth direction. The research results in the paper can provide new ideas and basis for the safety evaluation and life prediction of nuclear structural materials.
引文
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[2]蒋文春,巩建鸣,陈虎,等.不锈钢板翘结构蠕变的有限元分析[J].金属学报,2007,43(5):539-545.
[3]张星,荆洪阳.残余应力作用下P92钢蠕变裂纹扩展研究[D].天津:天津大学,2010.
[4]张国栋.复杂载荷下焊接构件蠕变损伤与寿命预测研究[D].南京:南京工业大学,2008.
[5]付学义,刘莉.残余应力的危害和对策[J].包钢科技,2006,32(21):82-83.
[6]涂善东.高温工程学的兴起及其紧迫技术的研究,走向二十一世纪的中国力学[M].北京:清华大学出版社,1996:199-212.
[7]涂善东.高温结构完整性原理[M].北京:科学出版社,2003.
[8] Turski M, Bouchard P, Steuwer A, et al.Residual stress driven creep cracking in AISI Type 316 strainless steel[J].Acta Materialia,2008,56:3598-3612.
[9] Aninsworth R A.Assessment procedure for high temperature response of structures gloucester[M].UK:Nuclear Electric Ltd,1996.
[10] Standard test method for plane-atrain fracture toughness of metallic materials:E399-90[S].USA:ASTM International,2002.
[11]陈政.核电异种金属焊接接头应力腐蚀裂尖蠕变特性研究[D].西安:西安科技大学,2016.