Hybrid experimental-numerical strategy for efficiently and accurately identifying post-necking hardening and ductility diagram parameters
Hybrid experimental-numerical strategy for efficiently and accurately identifying post-necking hardening and ductility diagram parameters
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DOI：
10.1016/j.ijmecsci.2022.107074
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发表时间：
2022-01
影响因子：
7.3
通讯作者：
Shengwen Tu;Shota Suzuki;Zhuochen Yu;Kazuki Shibanuma
中科院分区：
文献类型：
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作者：
Shengwen Tu;Shota Suzuki;Zhuochen Yu;Kazuki Shibanuma
虽然已经建立了各种有效的模型来模拟金属材料的延性断裂，但确定所需参数的方法还很少被阐明。延性断裂模型参数识别的困难是延性断裂数值模拟中准确数值预测的实际瓶颈。本文提出了一种通过实验-数值混合方法有效识别后颈缩应变行为和延性图参数的策略。在所提出的策略中，只需要两种类型的实验：常规拉伸测试和裂纹扩展测试。通过使用两个试验的载荷-位移曲线进行数值优化，可以唯一地识别模拟颈缩后应变硬化行为和延性断裂的所有参数。将所提出的策略应用于A2024T3铝合金，并通过平面拉伸试验和Arcan试验确定了后颈缩硬化和塑性图参数。然后使用两种类型的带孔板试件来验证所提出的策略。实验结果和数值预测的良好一致性清楚地表明了所提出的策略的可行性和准确性。结果表明，所提出的策略简单有效。因此，它可以作为表征各种金属材料力学性能的一般依据。
Although various effective models for simulating ductile fracture in metallic materials have been established, the methods to identify the required parameters have scarcely been clarified. The difficulty for parameters identification of ductile fracture models is the actual bottleneck for accurate numerical predictions in ductile fracture simulation. In this paper, a strategy to efficiently identify the post-necking strain behaviour and the ductility diagram parameters is proposed by a hybrid experimental-numerical procedure. In the proposed strategy, only two types of experiments are required: a conventional tensile test and a crack growth test. All the parameters to simulate the post-necking strain hardening behaviour and the ductile fracture can be uniquely identified via numerical optimisations using load-displacement curves of the two tests. The proposed strategy was applied to an A2024T3 aluminium alloy and the post-necking hardening and ductility diagram parameters were identified by a flat tensile test and an Arcan test. Two types of plate specimens with a hole were then used to validate the proposed strategy. Good agreements between the experimental results and the numerical predictions clearly show the feasibility and accuracy of the proposed strategy. The results demonstrated that the proposed strategy is simple but effective. Therefore, it can be a general basis for characterising mechanical properties of various metallic materials.