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分别用光滑和轴对称切口两种圆柱形拉伸试样对６ｍｍ厚热轧Ｊ５５钢进行了Ｖ_（ＧＣ）参数测试，结果表明：Ｖ_（ＧＣ）参数因试样取向不同而存在较大差异，但与试样形式无关。这一结果和试验材料在板面上存在各向异性是一致的，本试验为采用小试样评价材料断裂特性提供了尝试。
V-GC parameters of 6mm thick hot-rolled J55 steel were tested by using two kinds of cylindrical tensile specimens with smooth and axisymmetric incision respectively. The results show that there are great differences in V GC parameters due to the different orientation of specimens, But has nothing to do with the sample form. This result is in agreement with the anisotropy of the test material on the plate surface. This test provides an attempt to evaluate the fracture characteristics of materials using small samples.