Aimed at the deficiency of tube hydro plasticity technology, effect of stress ratio on tension destabilization was analyzed by plasticity mechanic.

• 摘要针对目前管材内液塑性成形中缺陷对工艺的影响，借助塑性力学分析手段，对轴向和环向的应力比对拉伸失稳极限应变的影响进行了分析。