【摘要】 为了探究消音管内高压成形过程中的开裂原因,利用MARC有限元分析软件,模拟了无缝管和焊接管在焊接及内高压成形过程中焊缝附近的温度、应力及壁厚分布情况.结果表明,无缝管在胀形区会产生560 MPa的周向拉伸残余应力且该区域壁厚减薄率为4%,焊接管在过渡区产生了271 MPa的轴向拉伸残余应力.轴向拉伸焊接残余应力是内高压成形过程中的不利因素,使焊接管在内高压成形后的轴向压缩残余应力变成轴向拉伸残余应力,导致焊接管容易胀裂.对焊接热循环曲线和焊接残余应力进行了测量,模拟结果与试验结果吻合良好,验证了模拟结果的正确性.更多还原

【Abstract】 In order to explore the reason of cracking of silencer tube in the internal high pressure forming process,the distributions of temperature,stress and wall thickness near the weld zone of welded tube and seamless pipe in the internal high pressure forming process were simulated by using MARC finite element analysis software. The experiments show that there is 560 MPa circumferential tensile residual stress in bulged zone of seamless tube and its wall thickness will be reduced by 4%.There is 271 MPa axial tensile residual stress in the transition zone of welded pipe. The axial welding tensile residual stress isthe unfavorable factors in the internal high pressure forming process. The axial compressed residual stress will changed into axial tensile residual stress after internal high pressure forming,which caused welding pipe was easy to burst. Welding thermal cycle curve and residual stress were measured. The simulation results are in good agreement with the tested results,which prove the validity of the simulation results.更多还原