基于主 S-N 曲線法的板邊焊接接頭疲勞評估

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中圖分類號：TG407；TB115.1 文獻(xiàn)標(biāo)志碼：B

Fatigue evaluation of plate edge welded joints based on master S-N curve method

XU Jixin'，DOU Fei2，GUI Zhiyuan2，LI Mingjun2，NIE Chunge2

（1.CRRC.Dalian Co.，Ltd，Dalian 116022，Liaoning，China； 2.Schoolof Locomotive&Roling Stock Engineering，Dalian Jiaotong University，Dalian 116028，Liaoning，China）

Abstract： The conventional calculation process based on the master S ？ N curve has the problem that it is difficult to calculate the fatigue control stress when evaluating the welded joints at the plate edge，and three possible calculation schemes are proposed and compared and analyzed. Scheme I calculates the structural stress of the weld toe by defining the virtual weld wire，butthe stress value is very sensitive to the mesh size due to the excessive stress gradient in the weld toe area. The calculated results of schemes I and II are not sensitive to mesh，and at the same time，they are in good agreement with the fatigue test data，which proves the applicability. Based on schemes II and ，the fatigue cracking problem of the plate side joint of a certain type of locomotive chassis is analyzed.The results show that scheme II only uses the grid in the range of 2 times the plate thickness near the weld toe for calculation，which is more suitable for engineering structures with complex geometric features and stress states.

Key words： plate edge welded joints； fatigue life；structural stress；master S N curve；finite element

0引言

焊接接頭往往是焊接結(jié)構(gòu)中的薄弱位置，對焊接接頭進(jìn)行疲勞評估是結(jié)構(gòu)設(shè)計的關(guān)鍵環(huán)節(jié)之_[1-2]。（剩余6030字）