CAJ | 학술논문

为了定量评定残余应力对疲劳损伤的影响，运用ANSYS有限元软件进行了焊接温度场和焊接应力场的模拟，并通过改变加载顺序、预热等方法得到了不同消残比例的焊接残余应力，用基于临界面法进行了考虑不同消残比例的拉耳子结构风致疲劳累积损伤分析。结果发现在同一消除焊接残余应力的比例下，疲劳损伤以180°风向角呈对称变化，在90°风向角时，疲劳累积损伤最小，在0°风向角时，疲劳累积损伤值最大；随着焊接残余应力消除比例的增大，所对应的疲劳累积损伤越小。研究表明，在基于临界面法的桅杆拉耳子结构焊接节点的疲劳累积损伤计算中，引进平均应力这一参数可以很好地定量评估不同消残比例、不同风向、不同风速等级下的损伤程度。
위료정량평정잔여응력대피로손상적영향，운용ANSYS유한원연건진행료한접온도장화한접응력장적모의，병통과개변가재순서、예열등방법득도료불동소잔비례적한접잔여응력，용기우림계면법진행료고필불동소잔비례적랍이자결구풍치피로루적손상분석。결과발현재동일소제한접잔여응력적비례하，피로손상이180°풍향각정대칭변화，재90°풍향각시，피로루적손상최소，재0°풍향각시，피로루적손상치최대；수착한접잔여응력소제비례적증대，소대응적피로루적손상월소。연구표명，재기우림계면법적외간랍이자결구한접절점적피로루적손상계산중，인진평균응력저일삼수가이흔호지정량평고불동소잔비례、불동풍향、불동풍속등급하적손상정도。
For quantitatively exploring the impact of welding residual stress on fatigue damage, we carry out a numerical simu-lation on welding temperature field and stress field by ANSYS, and the welding residual stress under different residual stress elim-ination ratio is obtained by changing loading order and preheating method. Wind-induced cumulative fatigue of ear-plate under different residual stress elimination ratio is analyzed by critical plane method. The results show that under the same residual stress elimination ratio, the fatigue damage shows a symmetrical variation by axis of the 180° wind angle, namely the minimum cumula-tive fatigue damage is found at the 90° wind angle, and the maximum damage occurs at the 0° wind angle. The cumulative fatigue damage decreases with increase of residual stress elimination ratio. It is demonstrated that by introducing a parameter of average stress into the fatigue damage calculation of ear-plate structure based on critical plane method, we can access the damage level of ear-plate that is subject to different residual stress elimination ration, various wind direction and wind speed with satisfied ac-curacy.