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介绍了示波冲击试验技术及其用于评价材料的动态断裂韧性方面的试验研究结果。采用了对变形速率不敏感的铝合金试样的静弯曲曲线与动态的示波冲击曲线的对比,较准确地标定了示波冲击曲线图中的载荷坐标,并且对14MnMONbB,12CrNi3MoV和12CrNi5MoV等三个低合金高强度钢进行了系统的示波冲击试验,研究不同缺口形状的冲击试样、试验温度对示波图形的影响。结果表明:用预裂纹试样能够比较直观地反映材料的断裂韧性;随着试验温度的降低其裂纹扩展功不断下降。
Introduced the oscillometric impact test technology and its experimental results for evaluating the dynamic fracture toughness of the material. The static bending curve and the dynamic oscillometric impact curve of the aluminum alloy specimens which are not sensitive to the deformation rate are compared, and the load coordinates in the oscillometric impact curve are more accurately calibrated. The influence of 14MnMONbB, 12CrNi3MoV and 12CrNi5MoV A low-alloy high-strength steel was subjected to a systematic oscillometric impact test to study impacting effects of different notched shapes and test temperatures on oscillographic patterns. The results show that the fracture toughness of the material can be directly reflected by the pre-cracked specimen, and the crack extension work decreases with the decrease of the test temperature.