中低强度钢超声冲击处理焊接接头热点应力设计曲线
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摘要
用ANSYS计算了对接接头、横向非承载十字接头和纵向非承载角接板的热点应力集中系数Khs,根据Q235B和Q345B的超声冲击处理焊接接头的相关疲劳试验数据得出经过应力比、板厚和几何不平度修正后的超声冲击处理焊接接头的热点应力设计S-N曲线.结果表明,经过超声冲击处理后,中低强钢(Rm≤355 MPa)对接接头、横向非承载十字接头和纵向非承载角接板的热点应力S-N曲线的分散性降低,与接头形式无关,可以用一条热点应力设计S-N曲线表达.在采用热点应力法进行疲劳设计时,选取m=10.0,上述三种类型焊接接头在2×106次疲劳强度级别可统一采用FAT135来表示.
First,the hot spot stress concentration factor( Khs) of butt joints,transverse non-load-carrying cruciform joints and non-load-carrying longitudinal fillet plate joints are calculated using ANSYS. Then,according to the relevant fatigue tests results of ultrasonic impact treated welded joints of Q235 B and Q345 B,the corrected hot spot stress design S-N curve by stress ratio,thickness and geometric irregularities of ultrasonic impact treated welded joints is obtained. Analysis shows that the dispersion of data points of the hot spot stress design S-N curve of ultrasonic impact treated butt welds,transverse non-load-carrying cruciform joints and non-load-carrying longitudinal fillet welds of medium and low strength steel reduced and can be expressed with one design S-N curve independent of the form of joint. The recommended m = 10. 0 is also applied for hot spot stress fatigue design and the fatigue strength level of the three types of welded joint above-mentioned can uniformly applied to FAT135 at 2 ×106 times.
First,the hot spot stress concentration factor( Khs) of butt joints,transverse non-load-carrying cruciform joints and non-load-carrying longitudinal fillet plate joints are calculated using ANSYS. Then,according to the relevant fatigue tests results of ultrasonic impact treated welded joints of Q235 B and Q345 B,the corrected hot spot stress design S-N curve by stress ratio,thickness and geometric irregularities of ultrasonic impact treated welded joints is obtained. Analysis shows that the dispersion of data points of the hot spot stress design S-N curve of ultrasonic impact treated butt welds,transverse non-load-carrying cruciform joints and non-load-carrying longitudinal fillet welds of medium and low strength steel reduced and can be expressed with one design S-N curve independent of the form of joint. The recommended m = 10. 0 is also applied for hot spot stress fatigue design and the fatigue strength level of the three types of welded joint above-mentioned can uniformly applied to FAT135 at 2 ×106 times.
引文
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[2]王东坡,王婷,霍立兴,等.超声冲击处理管接头疲劳设计曲线[J].焊接学报,2006,27(3):34-38.Wang Dongpo,Wang Ting,Huo Lixing,et al.Fatigue design curve of ultrasonic impact treated welded tubular joints[J].Transactions of the China Welding Institution,2006,27(3):34-38.
[3]王东坡,田瑞莹,霍立兴,等.超声冲击处理焊接接头疲劳设计若干问题的探讨[J].机械工程学报,2006,42(11):173-178.Wang Dongpo,Tian Ruiying,Huo Lixing,et al.Discussion about improving fatigue performance of welded joint by ultrasonic peening[J].Chinese Journal of Mechanical Engineering,2006,42(11):173-178.
[4]王东坡,霍立兴,张玉凤,等.变幅载荷下超声冲击处理焊接接头的疲劳行为[J].机械工程学报,2006,11(11):173-178.Wang Dongpo,Huo Lixing,Zhang Yufeng,et al.Fatigue behavior of the welded joints treated by ultrasonic peening under variable amplitude load[J].Chinese Journal of Mechanical Engineering,2006,11(11):173-178.
[5]王东坡,霍立兴,张玉凤,等.焊接残余应力对超声冲击处理焊接接头疲劳性能的影响[J].机械工程学报,2004,40(5):150-154.Wang Dongpo,Huo Lixing,Zhang Yufeng,et al.Effect of welding residual stress on fatigue performance of the welded joints treated by ultrasonic peening[J].Chinese Journal of Mechanical Engineering,2004,40(5):150-154.
[6]吴良晨,王东坡,邓彩艳,等.超长寿命区间16Mn钢焊接接头疲劳性能[J].焊接学报,2008,29(3):117-120.Wu Liangchen,Wang Dongpo,Deng Caiyan,et al.Fatigue properties of welded joints of 16Mn steel in super long liferegin[J].Transactions of the China Welding Institution,2008,29(3):117-120.
[7]张彦华.焊接强度分析[M].西安:西北工业大学出版社,2011.
[8]Hobbacher A F.Recommendations for fatigue design of welded joints and components[C]∥IIW Document IIW-xxxx-13ex XIII-2460-13/XV-1440-13.Update Sep,2013:26-34.