采用有限元方法研究分析了φ1 219 mm×33 mm规格X80高钢级厚壁直缝埋弧焊管JCO成型过程中的应力和应变分布。结果表明：在该过程中，应力和应变均以钢板与上模具下压点为中心呈左右对称分布，最大等效应变和最大等效应力均位于弯曲处内外表面；随着位移载荷绝对值的增加，最大等效应变和最大等效应力也随之增加，当位移载荷h=18 mm时，模型最大等效应变达到屈服状态。采用理论计算方法得到该规格钢管的理论成型下压量h=17.8 mm，与有限元模拟计算结果非常接近。

The stress and strain distribution of φ1 219 mm×33 mm X80 high grade heavy-wall longitudinal submerged arc welded (LSAW) pipes during JCO forming process was simulated by finite element methods (FEM). The results show that both the stress and strain distributed symmetrically from the middle of the up die, and both the maximum equivalent stress and the maximum equivalent strain located at inner and outer surface crossing to the middle line of the pressed plate. With the increase of absolute value of displacement loads, the equivalent stress and strain also increased, and when the displacement load h=18 mm, the maximum equivalent strain of the section of the pressed plate had been yielded. And the deforming displacement of the forming process was calculated as h=17.8 mm theoretically which was very close to the results of FEM simulation.