Numerical and experimental investigations on the formability of three-dimensional aluminum alloy sandwich panels with egg-box-like cores
Numerical and experimental investigations on the formability of three-dimensional aluminum alloy sandwich panels with egg-box-like cores
复制标题
蛋盒型芯三维铝合金夹芯板成形性能的数值与实验研究
DOI：
10.1007/s00170-018-2499-3
复制
发表时间：
2018-10-01
影响因子：
3.4
通讯作者：
Zhang, Xi
中科院分区：
文献类型：
--
作者：
Cai, Zhong-Yi;Liang, Xiao-Bo;Zhang, Xi
轻质夹芯板是各行业常用的提高结构刚度、减轻结构重量的材料。对于许多应用，夹层板需要作为三维壳体而不是平板。然而，具有弯曲中间平面的夹层结构目前难以制造。研究了蛋盒型芯铝合金夹层板的塑性成形工艺，探讨了由初始平板夹层板成形三维板的可能性。通过数值模拟，研究了成形过程中的变形特点和成形缺陷。分析了EBL芯夹层板的成形性，得出了球形板成形的极限曲线。进行了多点成形实验，成功地获得了具有正负高斯曲率的双曲板，且无任何成形缺陷，成形产品外形质量良好，验证了采用塑性成形技术成形EBL夹芯复合板的可行性。
Light-weight sandwich panels are commonly used in various industries to improve the stiffness and reduce the weight of structure component. For many applications, sandwich panels are required as three-dimensional shells rather than flat plates. However, sandwich structures with curved mid-planes are difficult to make at the present time. This paper was focused on the plastic forming operation of aluminum alloy sandwich plate with egg-box-like (EBL) cores and the possibility to produce a three-dimensional panel from an initially flat sandwich plate was investigated. Detailed numerical simulations have been carried out and the deformation characteristics and the forming defects in the plastic forming process were investigated. The formability of EBL-cored sandwich panel was analyzed, and the limit curve for forming spherical panel was obtained. Multi-point forming experiments were carried out and doubly curved panels with positive and negative Gaussian curvatures were successfully achieved without any forming defect; the satisfactory forming quality of the formed product shapes demonstrated the feasibility of using plastic forming technique to form EBL-cored sandwich panels.