Experimental and numerical study on shear-punch test of 6060 T6 extruded aluminum profile

Experimental and numerical study on shear-punch test of 6060 T6 extruded aluminum profile
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6060 T6挤压铝型材剪冲试验试验与数值研究

DOI:
10.1016/j.ijmecsci.2016.09.008
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发表时间:
2016-11
影响因子:
7.3
通讯作者:
Fang G
Fang G
中科院分区:
工程技术1区
文献类型:
--
作者:
Qain L;Paredesa M;Wierzbickia T;Sparrerc T;Feuersteind M;Zeng P;Fang G

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在目前的工作中,一个全面的实验/数值研究的6060 T6保险杠的轮廓进行组合剪切压缩(剪切冲压试验)负载。需要一组关键的塑性和断裂参数来正确预测结构部件的机械响应。实验室规模的试样上的断裂起始试验提供了足够的数据需要校准新扩展的非二次屈服函数Yld 2000 -3d和各向同性修正莫尔-库仑(MMC)断裂模型。然后在盘形试件上对标定的塑性和断裂本构模型进行了验证。此外,试验结果报告的全尺寸挤压铝保险杠受到剪切冲压载荷。建立了保险杠及其支撑结构的详细有限元模型。数值模拟结果表明,校准的材料模型不仅正确预测的整体力-位移响应,而且在多个起始点的局部断裂行为。结果表明,挤压型材多胞截面的不同部位经历了不同的加载历史。因此,在一个单一的测试中,广泛的应力三轴度发展,这需要引入一个非常完整的塑性和断裂模型。
In the present work a comprehensive experimental/numerical study on a 6060 T6 bumper profile subjected to combined shear-compression (shear-punch test) load is carried out. A set of key plasticity and fracture parameters to predict correctly the mechanical response of the structural component is required. Fracture initiation tests on lab scale specimens provide the sufficient data needed to calibrate the newly extended non-quadratic yield function Yld2000-3d and the isotropic Modified Mohr-Coulomb (MMC) fracture model. The calibrated plasticity and fracture constitutive model is then validated upon disk-shaped specimen. Moreover, test results are reported on full-scale extruded aluminum bumper subjected to shear-punch load. A detailed FE model of the bumper and the supporting structure was built. The numerical simulation outcomes demonstrate that the calibrated material model predicts correctly not only the global force-displacement response but also the local fracture behavior at multiple initiation points. It was shown that various part of the multi-cell cross-section of the extruded profile underwent different loading histories. Thus, in one single test a wide range of stress triaxialities develop which requires to introduce a very complete plasticity and fracture model.
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