利用临界空穴扩张比参数V_（GC）表征材料的延性断裂韧度

The Critical Void Growth Ratio V_(GC) a New Ductile Fracture Toughness

本文介绍一个新断裂韧度Ｖ_（ＧＣ）——临界空穴扩张比参数的测试原理和方法。建立了用圆柱切口拉伸试样测定Ｖ_（ＧＣ）的误差估算方程，论证了工程测试Ｖ_（ＧＣ）的可行性。文中还总结给出了十多种常见材料的Ｖ_（ＧＣ）实测结果，并分析讨论了Ｖ_（ＧＣ）与常规力学性能及断裂韧度Ｊ_（ＩＣ）的关系。

n the present poper,the eperimental principle and metnod for determining the new fracture toughness-the crtiical void growth ratio V_(GC) is recommend summarilyt.The equation to estimate the meaurement error of fracture toughness V_(GC) is derived and empolyed to analyse the maximum relative error of V_(GC) in ac-tual test.The V_(GC) data for more than ten states of materials are presented,and then the correlations of the new fracture toughness V_(GC) with the conventional mechanical properties and the toughness J_(IC) are also dis-cussed.