Reddy P Praveen Kumar, Padhy Chinmaya Prasad, Janaki Ramulu P
Department of Mechanical Engineering, School of Technology, GITAM Deemed to Be University, Hyderabad, India.
Department of Mechanical Engineering, Adama Science and Technology University, Adama 1888, Ethiopia.
ScientificWorldJournal. 2024 Mar 8;2024:5117746. doi: 10.1155/2024/5117746. eCollection 2024.
Sheet metal forming is one of the key processes for the automotive sector to be considered. Sheet metal formability is being tested as received, joining them with different welding/joining processes (i.e., tailored blanks) and making them as sandwich forms to reduce the total weight of the body. These sandwich formations of sheets are an advanced method by incorporating PVC/polymer sheets in between metal sheets with a suitable binder. The present work has investigated the formability of AA5052-PVC-AA5052 (Al-PVC-Al) sandwich sheets by considering the sheet rolling direction as a parameter. The mechanical properties of base metal and sandwich sheets were evaluated by conducting the uniaxial tensile tests. For forming behaviour of Al-PVC-Al sandwich sheets, in-plane plane stretching tests were performed on the universal tensile testing machine. From the results, it has been observed that 0-degree and 90-degree rolling direction of AA5052 sheets provided almost similar forming behaviour where the 45-degree rolling direction showed less formability. The limit strains (by which the forming limit curve has been developed and the safe and failure zones are separated) are 0.043, 0.038, and 0.043 of 0°, 45°, and 90°, respectively. Considering 0°-P-90°, 90°-P-90, 0°-P-45°, 0°-P-90°, and 45°-P-45° sandwich sheets with their corresponding limit strains of 0.060, 0.058,0.057, 0.052, and 0.050, a better formability is seen in 0°-P-90° sandwich, followed by 90°-P-90, 0°-P-45°, 0°-P-90°, and 45°-P-45°. The improvement in the formability is calculated as 28.33%, 25.86%, and 24.0% in comparison with the base metal in 0-degree, 90-degree, and 45-degree rolling directions and 0°-P-90°, 90°-P-90, and 45°-P-45° sandwich sheets.
钣金成型是汽车行业需要考虑的关键工艺之一。钣金可成型性在材料接收时就进行测试，通过不同的焊接/连接工艺（即拼焊板）将它们连接起来，并制成夹层形式以减轻车身总重量。这些板材的夹层结构是一种先进的方法，即在金属板之间加入PVC/聚合物板材，并使用合适的粘合剂。本研究以板材轧制方向为参数，研究了AA5052-PVC-AA5052（铝-PVC-铝）夹层板的可成型性。通过进行单轴拉伸试验评估了母材和夹层板的力学性能。对于铝-PVC-铝夹层板的成型行为，在万能拉伸试验机上进行了平面内拉伸试验。从结果可以看出，AA5052板材0°和90°的轧制方向具有几乎相似的成型行为，而45°轧制方向的可成型性较差。极限应变（据此绘制成型极限曲线并区分安全区和失效区）在0°、45°和90°时分别为0.043、0.038和0.043。对于0°-P-90°、90°-P-90、0°-P-45°、0°-P-90°和45°-P-45°夹层板，其相应的极限应变分别为0.060、0.058、0.057、0.052和0.050，其中0°-P-90°夹层板的可成型性最好，其次是90°-P-90、0°-P-45°、0°-P-90°和45°-P-45°。与0°、90°和45°轧制方向的母材以及0°-P-90°、90°-P-90和45°-P-45°夹层板相比，可成型性的提高分别为28.33%、25.86%和24.0%。
