混合钢U肋加劲板焊接残余应力影响因素分析

发布时间：2018-03-17 08:31

本文选题：钢桥　切入点：焊接残余应力　出处：《福州大学学报(自然科学版)》2015年06期 　论文类型：期刊论文

【摘要】：建立三维热弹塑性有限元模型,对混合钢U肋加劲板的焊接温度场和应力场进行模拟,并应用盲孔法残余应力测试试验验证了该数值模拟方法的正确性.应用经验证的焊接残余应力数值模拟方法,研究散热系数、焊接有效功率、熔池面积大小、焊接速度变化对混合钢U肋加劲板焊接残余应力分布与大小的影响.结果显示,焊接有效功率对混合钢U肋加劲板的残余应力分布的影响最大,其次为熔池面积及焊接速度,散热系数影响很小;母板和U肋的残余拉应力和残余压应力大小、残余拉应力区分布宽度、母板残余拉应力合力和残余压应力合力,与焊接有效功率和熔池面积大小成正比变化,与焊接速度成反比变化;而U肋残余拉应力合力和残余压应力合力,与焊接有效功率成正比变化,与熔池面积大小和焊接速度成反比变化.
[Abstract]:Three-dimensional thermoelastic-plastic finite element model is established to simulate the welding temperature field and stress field of U-rib stiffened plate of mixed steel. The validity of the numerical simulation method is verified by the blind hole residual stress test. The heat dissipation coefficient, welding effective power and weld pool area are studied by using the verified welding residual stress numerical simulation method. The effect of welding speed on the distribution and size of welding residual stress of U-ribbed stiffened plate of mixed steel is studied. The results show that the effective power of welding has the most influence on the distribution of residual stress of U-rib stiffener of mixed steel, followed by weld pool area and welding speed. The magnitude of residual tensile stress and residual compressive stress, the distribution width of residual tensile stress zone, the resultant force of residual tensile stress and residual compressive stress of motherboard, The change is proportional to the welding effective power and weld pool area, and inversely proportional to the welding speed, while the U-rib residual tensile stress and residual compressive stress force are proportional to the welding effective power. It is inversely proportional to the weld pool area and welding speed.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金项目(51478120;51108087)
【分类号】：U441.5;U445.583

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