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焊接残余应力对Invar钢疲劳寿命影响分析

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Indexed by:期刊论文

Date of Publication:2013-04-25

Journal:焊接学报

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:34

Issue:4

Page Number:93-95,108

ISSN No.:0253-360X

Key Words:Invar钢;焊接残余应力;晃荡;疲劳寿命

Abstract:利用有限元软件MSC.Marc计算了液化石油天然气船液舱Invar钢薄膜的焊接温度场和残余应力场,并计算了焊接残余应力与液体晃荡压力耦合条件下焊缝处的疲劳寿命.结果表明,焊缝表面中心线上的节点的纵向残余应力可达298.1 MPa左右,焊缝纵向残余应力的峰值可达328.3 MPa左右,高于Invar钢的室温屈服强度280.1 MPa.由于焊接残余应力的存在,Invar钢薄膜焊缝的疲劳寿命约由2.1×106降低到1.7×105.

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