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An analytical investigation on the wrinkling of aluminium alloys during stamping using macro-scale structural tooling surfaces

机译:用宏观结构工具表面冲压铝合金皱折的分析研究

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摘要

Structural surface texturing is believed to be a promising approach to modify tribological and thermal performances of tooling for sheet-stamping processes. However, a fundamental study on the surface-texturing design and resulting material deformation is currently lacking. In this paper, an advanced analytical buckling model specifically for the utilisation of textured tools at macro-scale, comprising dislocation-driven material model, isotropic yield criteria, bifurcation theory and Donnell-Mushtari-Vlasov (DMV) shell structure theory, was established. The developed analytical buckling model was validated by cylindrical deep-drawing experiments. Further finite element (FE) simulations with the implementation of material model via user-defined subroutine were also used to validate the bucking model for large surface texture designs. Effects of theoretical assumptions, such as yield criterion, boundary condition and test-piece geometry, on the accuracy of model prediction for wrinkling were investigated. It was found that the von Mises yield criterion and hinged boundary condition exhibited more accurate predictions. In addition, the DMV shell theory made this model most representative for large structural texturing designs. Furthermore, the implementation of induced shear strain component has an important effect on precisely predicting the wrinkling occurrence. The advanced analytical models developed in this study combine various classical mechanics, structure stability and material modelling together, which provides a useful tool for tooling engineers to analyse structural designs.
机译:人们认为,结构表面纹理化是一种改进的工具,以改善板材冲压过程中工具的摩擦学性能和热学性能。但是,目前尚缺乏对表面纹理设计和所导致的材料变形的基础研究。在本文中,建立了一个专门用于宏观尺度的高级屈曲分析模型,包括位错驱动的材料模型,各向同性屈服准则,分叉理论和Donnell-Mushtari-Vlasov(DMV)壳结构理论。通过圆柱拉深实验验证了所建立的分析屈曲模型。通过用户定义的子例程实现材料模型的其他有限元(FE)仿真也用于验证大型表面纹理设计的屈曲模型。研究了屈服准则,边界条件和试件几何形状等理论假设对起皱模型预测准确性的影响。发现冯·米塞斯屈服准则和铰接边界条件显示出更准确的预测。此外,DMV壳理论使该模型最适合大型结构纹理设计。此外,诱发剪切应变分量的实施对于精确预测起皱的发生具有重要作用。本研究中开发的高级分析模型将各种经典力学,结构稳定性和材料建模结合在一起,为工具工程师分析结构设计提供了有用的工具。

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