提出了铝合金板材磁脉冲冲击弹性介质成形技术,克服了传统板材磁脉冲成形中存在的板材导电性、贴模和线圈局限等问题。成形中耦合了磁脉冲成形的高应变速率效应和弹性介质的柔性作用,无需针对不同成形件形状频繁更换线圈,容易实现多次...提出了铝合金板材磁脉冲冲击弹性介质成形技术,克服了传统板材磁脉冲成形中存在的板材导电性、贴模和线圈局限等问题。成形中耦合了磁脉冲成形的高应变速率效应和弹性介质的柔性作用,无需针对不同成形件形状频繁更换线圈,容易实现多次冲击成形。针对5052铝合金板材,进行了磁脉冲冲击弹性介质成形试验研究。研究了放电能量和成形温度对变形的影响,分析了胀形高度、壁厚和减薄率的变化规律。结果表明,7 k J/200℃下,板材产生较显著变形,峰值胀形高度为18.1 mm,壁厚减薄率为41%。7 k J/200℃下二次冲击可进一步提高板材的变形程度,极限应变分布明显高于准静态。通过微观组织分析发现,200℃下成形晶粒发生长大,150℃下二次冲击后的晶粒出现细化趋势。调节优化放电能量、成形温度与冲击次数可实现5052铝合金板材成形性的大幅提高。展开更多
The electromagnetic free bulging experiment and the coupled-field numerical simulation of the EMF process were carried out to determine the possibility to improve the formability of magnesium alloy AZ31 sheets(1 mm th...The electromagnetic free bulging experiment and the coupled-field numerical simulation of the EMF process were carried out to determine the possibility to improve the formability of magnesium alloy AZ31 sheets(1 mm thick)at room temperature.Formability data were examined using strain measurements.The numerical simulation for the electromagnetic sheet free bulging is performed by means of ANSYS FEA software.Compared with quasi-static FLD results,increase in the major and minor principal strains of approximately 87%and 39%were achieved,respectively.The effects of various process parameters on electromagnetic bulging of AZ31 magnesium alloy sheets were evaluated. Three-dimensional(3D)FE model is established to predict the electromagnetic bulging of the sheet.The simulation results agreed well with experimental observations.展开更多
文摘提出了铝合金板材磁脉冲冲击弹性介质成形技术,克服了传统板材磁脉冲成形中存在的板材导电性、贴模和线圈局限等问题。成形中耦合了磁脉冲成形的高应变速率效应和弹性介质的柔性作用,无需针对不同成形件形状频繁更换线圈,容易实现多次冲击成形。针对5052铝合金板材,进行了磁脉冲冲击弹性介质成形试验研究。研究了放电能量和成形温度对变形的影响,分析了胀形高度、壁厚和减薄率的变化规律。结果表明,7 k J/200℃下,板材产生较显著变形,峰值胀形高度为18.1 mm,壁厚减薄率为41%。7 k J/200℃下二次冲击可进一步提高板材的变形程度,极限应变分布明显高于准静态。通过微观组织分析发现,200℃下成形晶粒发生长大,150℃下二次冲击后的晶粒出现细化趋势。调节优化放电能量、成形温度与冲击次数可实现5052铝合金板材成形性的大幅提高。
基金Item Sponsored by National Basic Research Program of China[973 Program][2011CB012805]
文摘The electromagnetic free bulging experiment and the coupled-field numerical simulation of the EMF process were carried out to determine the possibility to improve the formability of magnesium alloy AZ31 sheets(1 mm thick)at room temperature.Formability data were examined using strain measurements.The numerical simulation for the electromagnetic sheet free bulging is performed by means of ANSYS FEA software.Compared with quasi-static FLD results,increase in the major and minor principal strains of approximately 87%and 39%were achieved,respectively.The effects of various process parameters on electromagnetic bulging of AZ31 magnesium alloy sheets were evaluated. Three-dimensional(3D)FE model is established to predict the electromagnetic bulging of the sheet.The simulation results agreed well with experimental observations.
