就分 nalysis of stress-state and strain-state四 §7-1应力状态概述 (Introduction of stress-state) 、应力状态的概念( Concepts of stresses-state) 请看下面几段动画 1.低碳钢和铸铁的拉伸实验 (A tensile test of low-carbon steel and cast iron) 2低碳钢和铸铁的扭转实验 (A torsional test of low-carbon steel and cast iron)