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華中科技大學學報(自然科學版) 2020, Vol. 48 Issue (10): 81-85 DOI10.13245/j.hust.201014

欄目:船舶與海洋工程
基于結構應力法的薄板對接焊縫疲勞性能
譚潤澤 , 李曉彬 , 樂京霞
武漢理工大學交通學院,湖北 武漢 430063
摘要 針對薄板焊接結構的使用受到諸多限制的問題,通過三維激光掃描技術獲取薄板焊接結構的整體焊接變形數據,采用高階多項式分段函數的擬合方法優化焊接變形,提高模擬焊接變形的準確性.基于等效結構應力法,計算計及焊接變形的結構焊趾和焊根位置處的疲勞結構應力,驗證了結構應力法網格不敏感性,獲取了考慮焊接變形下沿焊縫的等效結構應力分布規律,并與焊縫處的熱點應力進行對比,結果表明:結構應力法計算的焊縫處最大結構應力為319.98 MPa,其疲勞危險點位于焊縫方向318 mm處,相較于熱點應力法,結構應力法計算的應力水平更高且疲勞危險點的位置更接近實際焊縫的初始裂紋位置.
關鍵詞 薄板焊接 ;焊接變形 ;結構應力法 ;疲勞壽命 ;有限元分析
Fatigue property of the thin-plate butt-weld joint based on structural stress method
TAN Runze , LI Xiaobin , LE Jingxia
School of Transportation,Wuhan University of Technology,Wuhan 430063,China
Abstract Aiming at the problem that the use of the thin welded structure was subject to many restrictions,the whole welding deformation data of the thin-plate welded structure was obtained by using the three-dimensional laser scanning technology.To improve the accuracy of simulated welding deformation,a piecewise-function higher order polynomial fitting method was performed to optimize welding distortion.On the basis of equivalent structural stress method,the fatigue structural stress of the weld toe and the weld root considering welding deformation was calculated.The mesh insensitivity of structural stress method was verified.The equivalent structural stress distribution along the welded joint considering welding deformation was given,and the results of the stress were compared with the hot-spot stress at the welded joint.The results show that the maximum structural stress calculated by the structural stress method at the weld is 319.98 MPa,and the fatigue risk point is located at 318 mm in the weld direction.Compared with the hot-spot stress method,the calculated result of stress level of the structural stress method is higher and the position of the fatigue risk point is closer to the initial crack position of the actual weld.
Keywords thin-plate weld ; welding deformation ; structural stress method ; fatigue life ; finite element analysis
基金資助國家自然科學基金資助項目(51679177)

中圖分類號TG405
文獻標志碼A
文章編號1671-4512(2020)10-0081-05
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文獻來源
譚潤澤, 李曉彬, 樂京霞. 基于結構應力法的薄板對接焊縫疲勞性能[J]. 華中科技大學學報(自然科學版), 2020, 48(10): 81-85
DOI:10.13245/j.hust.201014
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