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首页> 美国卫生研究院文献>Materials >On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets
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On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets

机译：关于应变路径独立度量和临界距离规则的使用以预测AA7075-O拉伸弯曲纸张的故障

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摘要

The strain-based forming limit curve is the traditional tool to assess the formability of metal sheets. However, its application should be restricted to proportional loading processes under uniform strain conditions. Several works have focused on overcoming this limitation to characterize the safe process windows in industrial stretch-bend forming processes. In this paper, the use of critical distance rule and two path-independent stress-based metrics are explored to numerically predict failure of AA7075-O stretch-bend sheets with 1.6 mm thickness. Formability limits of the material were experimentally obtained by means of a series of Nakazima and stretch-bending tests at different thickness-over-radius ratios for inducing controlled non-uniform strain distributions across the sheet thickness. By using a 3D calibrated finite element model, the strain-based forming limit curve was numerically transformed into the path-independent stress and equivalent plastic strain polar spaces. The numerical predictions of necking strains in the stretch-bending simulations using the above approaches were successfully compared and critically discussed with the experimental results for different values of the critical distance. It was found that failure was triggered by a critical material volume of around the half thickness, measured from the inner surface, for the both path-independent metrics analyzed.
机译：基于应变的成形极限曲线是评估金属板的可成形性的传统工具。然而，其应用应该仅限于均匀应变条件下的比例加载过程。有几项作品专注于克服这种限制，以表征工业拉伸弯曲成型工艺中的安全工艺窗口。在本文中，探讨了临界距离规则和两个独立的基于应力的度量的使用，以便在数值上预测具有1.6mm厚度的AA7075-O拉伸弯曲板的失效。通过在不同厚度过度半径比下通过一系列Nakazima和拉伸弯曲试验进行实验地获得材料的可成形性限制，用于诱导穿过片材厚度的受控的非均匀应变分布。通过使用3D校准有限元模型，基于应变的成形限制曲线在数量上变换到无线的应力和等效塑料应变极性空间中。使用上述方法的拉伸弯曲模拟中的颈菌菌株的数值预测被成功地进行了比较和批判性地讨论了临界距离的不同值的实验结果。发现，对于从内表面测量的两种独立的度量，通过围绕半厚度的临界材料体积触发失败，用于分析的这两个路径无关的度量。

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