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用HJ-Ⅲ型超声冲击枪对转向架用SMA490BW钢十字焊接接头焊趾表面进行超声冲击处理;根据不同冲击参数获得的几何形貌建立相应的三维模型,再通过有限元软件Ansys计算不同冲击参数下的应力集中系数Kt;应用Origin软件拟合过渡圆弧半径、凹陷深度和应力集中系数与冲击时间的数据关系。结果表明:应力主要集中在十字焊接接头的焊趾凹陷处;应力集中系数Kt随焊趾过渡圆弧半径增大而减小,随凹陷深度的增加而增大;过渡圆弧半径、凹陷深度随冲击时间的增加先增大后趋于平缓;应力集中系数Kt随冲击时间的增加在0~5 min阶段下降较快后维持在1.85左右。
HJ-Ⅲ ultrasonic impact gun on the bogie SMA490BW steel cross weld toe surface ultrasonic impact treatment; according to different impact parameters obtained geometry to establish the corresponding three-dimensional model, and then through the finite element software Ansys different impact parameters Under the stress concentration factor Kt; Origin software fitting transition arc radius, depression depth and stress concentration factor and impact time data. The results show that the stress is mainly concentrated in the weld toe depression of the cross welded joint. The stress concentration factor Kt decreases with the increase of the radius of the toe transitional arc and increases with the increase of the depression depth. The radius of the transitional arc and the depth of depression The impact time increases first and then tends to be gentle. The stress concentration factor Kt decreases rapidly at 0-5 min with the increase of impact time, and remains at 1.85.