绪言为了定量地评定广泛使用于一般焊接结构的中低强度钢的脆性破坏发生特性,必需求出其断裂韧性值(临界应力强度因子K_c;临界裂纹张口位移δ_c;临界塑性区尺寸ρ_c)。但是,对2毫米V 形恰贝试验来说,因其试验方法简便,作为了解钢材韧性程度的一种质量鉴定标准的手段,有很大的实用 INTRODUCTION In order to quantitatively assess the brittle failure behavior of low and medium strength steels commonly used in welded structures, the fracture toughness (critical stress strength factor K_c; critical crack opening displacement δ_c; critical plastic zone size ρ_c) must be determined. However, for the 2 mm V-shaped Chaba test, because of its simple test method, it is very useful as a means of quality assessment to understand the degree of toughness of steel