GLARE层板液压胀形成形极限研究

Research on Forming Limits of GLARE Based on Hydro-bulging Test

纤维增强金属层板(FMLs)凭借其卓越的力学性能在众多领域中得到了广泛应用,成为当今研究的焦点。为解决未固化层板成形性及破裂形式不清晰的问题,本研究采用液压胀形试验,探讨了在不同边界条件下GLARE层板的成形极限。首先,借助理论方法建立了胀形顶点区域各组分材料受力表达式,并讨论了层间摩擦对成形极限的影响。其次,通过液压胀形试验分析了流体压力作用下纤维增强金属层板的失效形式,并建立了典型成形极限曲线图。最后,借助有限元仿真对上述试验进行了复现,研究结果表明,层间摩擦的增加显著降低了纤维增强金属层板的成形性,与理论分析及实验数据一致。该成形极限图不仅可以对成形效果进行评估,也为工艺参数优化提供参考依据。

Owing to their superior mechanical properties,Fiber Metal Laminates(FMLs)have garnered widespread application across various domains,emerging as a focal point in current research.To quantitatively the formability of FMLs,the hydro-bulging test under varied boundary conditions was employed.Firstly,a theoretical analysis of the stress status in the polar regions was conducted,delving into the influence of inter-layer friction on formability.Subsequently,the failure model of GLARE after the hydro-bulging test was identified and the typical Forming Limit Curve(FLC)was established by measuring the major strain and strain ratio.Finally,the finite element simulation method was used to reproduce the above test,and the results showed that the inter-layer friction significantly negatively influenced the FLC,which was consistent with the theoretical and experimental results.The derived FLC for GLARE not only assessed formability but also served as a crucial reference for optimizing process parameters.