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借助于示波冲击实验 ,建立加载速率 KⅠ ≈ 10 5MPa·m/s条件下 ,测定材料动态弹塑性断裂韧度JⅠd的方法。通过计算得到三点弯曲试样的动态裂纹尖端张开位移COD以及动态裂纹扩展量Δa ,在此基础上得到裂纹动态起裂点。在动态弹塑性断裂韧度JⅠd的计算中 ,考虑了材料动态应力—应变行为的影响。船用 945钢的测试结果表明 ,文中建立的方法简单、方便 ,适合于工程应用
With the aid of the oscillometric impact experiment, the method of determining the dynamic elasto-plastic fracture toughness J Id of the material under the condition of loading rate K Ⅰ ≈ 105MPa · m / s was established. The dynamic crack tip open displacement (COD) and dynamic crack growth (Δa) of three-point bending specimen were obtained by calculation, and the dynamic crack initiation point was obtained. In the calculation of dynamic elasto-plastic fracture toughness JId, the effect of dynamic stress-strain behavior of the material is taken into account. The test results of marine 945 steel show that the method established in this paper is simple and convenient and suitable for engineering application