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本文报导了２０＃低碳钢薄壁圆管试件在比例加载时Ｐ－ｐ复杂应力状态的实验结果．主要研究了：（１）初始屈服面；（２）经简单拉伸预加载和比例预加载情况下的强化规律，（３）折线预加载情况下的强化规律；（４）预施塑性变形量相等路径不同时的强化规律．
This paper reports the experimental results of P-p complex stress state of 20 # mild steel thin-walled tube specimens under proportional loading. The main research work is as follows: (1) initial yield surface; (2) strengthening law under simple prestressed and proportional preloading; (3) strengthening law under the condition of polyline preloading; (4) The same rules are not different at the same time.