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首页> 外文期刊>Journal of Materials Engineering and Performance >Characterization of Tensile Properties, Limiting Strains, and Deep Drawing Behavior of AA5754-H22 Sheet at Elevated Temperature
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Characterization of Tensile Properties, Limiting Strains, and Deep Drawing Behavior of AA5754-H22 Sheet at Elevated Temperature

机译：高温下AA5754-H22板材的拉伸性能，极限应变和深冲行为的表征

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摘要

Automotive industries are very much interested in characterization of formability improvement of aluminum alloys at elevated temperatures before designing tools, heating systems, and processing sequences for fabrication of auto-body panels by warm forming technology. In this study, tensile tests of AA5754-H22 aluminum alloy were carried out at five different temperatures and three different strain rates to investigate the deformation behavior correlating with Cowper-Symonds constitutive equation. Laboratory scale warm forming facilities were designed and fabricated to perform limiting dome height and deep drawing tests to evaluate forming limit strains and drawability of sheet metal at different tool temperatures. The forming limit strain and dome height improved significantly when both the die and punch were heated to 200 degrees C. Remarkable improvement in deep drawn cup depth was observed when die and punch temperatures were maintained at 200 and 30 degrees C, respectively, producing a non-isothermal temperature gradient of approximately 93 degrees C across the blank from flange to center. The forming behavior at different isothermal and non-isothermal conditions were predicted successfully using a thermo-mechanical FE model incorporating temperature-dependent properties in Barlat-89 yield criterion coupled with Cowper-Symonds hardening model, and the thinning/failure location in deformed cups were validated implementing the experimental limiting strains as damage model.
机译：在设计工具，加热系统以及通过热成型技术制造车身面板的加工顺序之前，汽车行业对表征高温下铝合金的可成形性改进非常感兴趣。在这项研究中，AA5754-H22铝合金在五个不同的温度和三个不同的应变速率下进行了拉伸试验，以研究与Cowper-Symonds本构方程相关的变形行为。设计和制造实验室规模的热成型设备，以执行极限拱顶高度和深冲测试，以评估在不同工具温度下的成型极限应变和钣金的可拉伸性。当模具和冲头都加热到200摄氏度时，成形极限应变和拱顶高度显着提高。当模具和冲头温度分别保持在200摄氏度和30摄氏度时，深冲杯深度得到了显着改善，产生了不合格现象。 -从法兰到中心的整个毛坯的等温温度梯度约为93摄氏度。利用结合Barlat-89屈服准则中温度相关特性的热机械有限元模型和Cowper-Symonds硬化模型，成功地预测了在不同等温和非等温条件下的成形行为。验证了将实验极限应变作为损伤模型的实现。

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