【摘要】 基于固有应变方法的弹性有限元方法是适用于大型复杂焊接结构件变形预测的有效方法,但这一方法得以运用的必要条件是必须已知存在于焊缝附近的固有变形.文中利用物理试验和数值模拟技术相结合的研究手段开发了典型焊接接头固有变形的逆解析数值计算方法.利用逆解析得到的固有变形值,采用固有应变弹性有限元方法对T形焊接接头的焊接变形进行了预测.通过比较数值模拟结果和试验测量值,验证了基于数值模拟技术的逆解析方法的求解精度.结果表明,T形焊接接头固有变形的逆解析算法是正确有效的.更多还原

【Abstract】 The prediction method based on inherent strain theory has been regarded as an effective way to estimate welding deformation for large and complex structures. However,when this method is used to simulate welding deformation in a large or complex structure,the values of inherent deformations in each typical joint must be known beforehand. In the present study,based on the combination of experiental mensurement and numerical simulation,a new inverse analysis method was proposed to obtain the inherent deformations for T-fillet welded joints. By using the inherent deformation obtained by the proposed method,the welding distortion in a low carbon steel T-joint was predicted by means of a forward elastic finite analysis based on inherent strain theory. Through comparing the simulated results and the measured data,the prediction accuray and effectiveness of the inverse analysis method were verifed.更多还原