【摘要】 按照ASTM E399—81通用试验标准,并考虑到结构钢棒材由于形变加工等原因造成的力学性能上的各向异性,设计和加工了高强结构钢30CrMnSiNi2A棒材C—R向拱形三点弯曲试样和L—C向直形三点弯曲试样,按工厂现行最终热处理工艺处理后,进行对比试验,分别测定了它们的断裂韧性。结果表明,C—R向的K_IC值比L—C向的约低1/3。这为实际构件的设计和断裂失效分析提供了必要的参考。更多还原

【Abstract】 According to ASTM E399-81 test standard and the consideration of the anisotropy in mechanical properties of structural steel bar caused by deformation process, a set of arc-shaped three-point bend specimens with C-R orientation and standard bend specimens with L-C orientation in the high-strength structural steel 30CrMnSiNi2A bars was designed and manufactured, and these specimens were heat-treated with current processes in the workshop. Then their fractrue toughnesses were determined separately by three-point bending method. The results showed that the fracture toughness KIC in C-R orientation is almost 1 / 3 less than KIC in L-C orientation. This case can be used as the necessary reference in the design and failure analysis of the actual structural components.更多还原