Combined Cycle Fatigue Testing with Ultrasonic FrequencyComponent of S350 Steel Welded Joint  

作　　者：Liu Yang Wang Dongpo Deng Caiyan Wu Liangchen Yin Danqing Gong Baoming 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]Tianjin Key Laboratory of Advanced Joining Technology,Tianjin 300072,China [3]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China

出　　处：《Transactions of Tianjin University》2014年第6期435-438,共4页天津大学学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.51305295,No.51375331 and No.51105133)

摘　　要：A combined cycle fatigue （CCF） testing system with ultrasonic frequency component was developed toevaluate the CCF properties of S350 steel welded joints in this study. The fatigue testing results indicated that the S-Ncurves of CCF did not have fatigue limit, which agreed with those of pure high frequency fatigue of welded joints. TheS-N curves showed that the CCF strength of welded joints dropped greatly with the increasing interaction between highand low frequency fatigue loading. An approximation design method of CCF was presented using amplitude envelopeas the stress range.A combined cycle fatigue(CCF) testing system with ultrasonic frequency component was developed to evaluate the CCF properties of S350 steel welded joints in this study. The fatigue testing results indicated that the S-N curves of CCF did not have fatigue limit, which agreed with those of pure high frequency fatigue of welded joints. The S-N curves showed that the CCF strength of welded joints dropped greatly with the increasing interaction between high and low frequency fatigue loading. An approximation design method of CCF was presented using amplitude envelope as the stress range.

关 键 词：FATIGUE WELDED joint combined CYCLE FATIGUE ULTRASONIC frequency 

分 类 号：G4[文化科学—教育学]