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首页> 外文期刊>International Journal of Fracture >Indirect measuring of crack growth by means of a key-curve-method in pre-cracked Charpy specimens made of nodular cast iron
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Indirect measuring of crack growth by means of a key-curve-method in pre-cracked Charpy specimens made of nodular cast iron

机译：通过关键曲线方法间接测量球墨铸铁制成的预裂纹夏比试样中的裂纹扩展

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摘要

The determination of dynamic crack resistance curves from single specimen fracture tests requires information about the crack advance during the experiment. Here, attention is focused on crack resistance curves for nodular cast iron based on experimental data from instrumented Charpy tests. In order to estimate the actual crack length a key curve method (KCM) is employed. On the other hand, the Charpy impact tests were realized numerically using finite element calculations in conjunction with a continuum damage model (CDM) to simulate ductile crack growth. The parameters of the CDM model were determined from the experimental data of single specimen fracture tests. Equivalence between the experimental and the numerical realization of a fracture test was ensured by validating the predictions of the numerical simulations by means of low blow fracture tests. Comparison between the crack advance predicted by the numerical simulations and the results obtained using the proposed KCM shows a sufficiently well agreement with the actual crack length. Furthermore, crack resistance curves obtained from single specimen tests using either standard estimation schemes in conjunction with the KCM or numerical simulations are compared with the predictions based on low blow fracture tests.
机译：从单个试样断裂试验确定动态抗裂曲线需要有关试验过程中裂纹进展的信息。在此，基于仪表化夏比试验的实验数据，球墨铸铁的抗裂性曲线集中在研究上。为了估计实际裂纹长度，采用了关键曲线法（KCM）。另一方面，使用有限元计算结合连续损伤模型（CDM）来模拟延性裂纹扩展，以数值方式实现了夏比冲击试验。 CDM模型的参数由单试样断裂试验的实验数据确定。通过低吹断试验验证数值模拟的预测，可以确保断裂试验的实验实现与数值实现之间的等效性。通过数值模拟预测的裂纹扩展与使用建议的KCM获得的结果之间的比较表明，裂纹扩展与实际裂纹长度具有足够好的一致性。此外，将使用标准估计方案结合KCM或数值模拟从单个试样测试中获得的抗裂曲线与基于低吹破裂试验的预测结果进行比较。

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