形变强化的测试及其工程应用

Measuroment of Strain Hardening and It's Engineering Application

用英制 Ｉｎｓｔｒｏｎ １１９５试验机，以工业纯铁制试样测试常规力学性能和真实应力应变。通过真实应力应变曲线与形变强化率ｄｓ／ｄｅ～ｅ曲线求出形变强化指数ｎ，ｅｆ及建立颈缩判据，找出与断裂韧性Ｋ１ｃ、ＣＯＤ（δ）的相关性。

With the aid of Instron 1195 Test Machine made in England, speci- mens of industry pure ferrite are measured for their normal mechanical properties and ture stress-strain, From the true stress-strain curve and the strain hardening rate ds/de-e curve, we derive the strain hardening exponents n and true strain, ef, The necking criterion is set up to find out the interrelation of fracture toughness K_(1c), COD (δ).