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首页> 外文期刊>International Journal of Mechanical Sciences >Fracture criteria identification using an inverse technique method and blanking experiment
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Fracture criteria identification using an inverse technique method and blanking experiment

机译：使用逆向技术方法和消隐实验确定断裂标准

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摘要

In order to optimize the blanking processes, it is important to identify the conditions within the deforming workpiece which may lead to fracture initiation and propagation. Within this framework, numerical simulations are widely used in industries to optimize sheet metal forming processes. However, in order to have a confidence in the results of such simulations, an accurate material model is required. The accuracy of a material model is affected by the constitutive equations and the values of the material parameters. In order to reduce the danger of fracture of metal parts during manufacturing processes, advanced optimal design requires knowledge of critical values of some fracture criteria of the material used. Experimental identification of fracture criteria are currently obtained by performing several complicated tests and long duration of experiments. This study presents a computation methodology allowing for the identification of critical values of fracture criteria in order to simulate crack initiation and propagation generated by shearing mechanisms, which are needed for metal blanking processes simulation. The approach is based on inverse technique using circular blanking experiments and finite element calibration model. The critical values of fracture criteria are obtained in such a way that the finite element force-penetration predicted curve fit the experimental plot deduced from blanking tests. The numerical results obtained by the simulation were compared with experimental ones to verify the validity of the proposed technique for fracture criteria identification.
机译：为了优化下料工艺，重要的是要确定变形工件内可能导致断裂开始和扩展的条件。在此框架内，数值模拟已广泛用于工业中以优化钣金成形工艺。但是，为了对这种模拟的结果有信心，需要精确的材料模型。材料模型的准确性受本构方程和材料参数值的影响。为了减少制造过程中金属零件断裂的危险，先进的最佳设计需要了解所用材料的某些断裂准则的临界值。当前，通过执行一些复杂的测试和长时间的实验可以获得对断裂标准的实验识别。这项研究提出了一种计算方法，可以识别断裂准则的临界值，以便模拟金属冲裁过程模拟所需的剪切机制产生的裂纹萌生和扩展。该方法基于使用圆形消隐实验和有限元校准模型的逆技术。以这样的方式获得断裂标准的临界值，使得有限元力穿透预测曲线适合从下料试验推导的实验曲线。通过仿真获得的数值结果与实验结果进行了比较，以验证所提出的技术用于断裂准则识别的有效性。

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