Laser forming of sandwich panels with metal foam cores
Laser forming of sandwich panels with metal foam cores
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DOI：
10.1115/1.4040959
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发表时间：
2018-07
影响因子：
2.1
通讯作者：
Tizian Bucher;S. Cardenas;Ravikant Verma;Wayne Li;Y. Yao
中科院分区：
文献类型：
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作者：
Tizian Bucher;S. Cardenas;Ravikant Verma;Wayne Li;Y. Yao
在过去的十年中，激光成形已被有效地用于弯曲各种金属泡沫，打开了在新的工程应用中应用这些独特材料的可能性。该研究的目的是将激光成形扩展到由金属面板连接到金属泡沫芯组成的弯曲夹芯板。金属泡沫夹层板将优异的减震性能和低重量的金属泡沫与金属面板的耐磨性和强度相结合，使其成为航空航天，汽车工业和太阳能发电厂等领域的许多应用的理想选择。为了更好地了解金属泡沫夹芯板的弯曲行为，以及激光成形对材料性能的影响，分析了激光成形过程中弯曲变形的基本机理。研究发现，分别支配固体金属和金属泡沫激光成形的成熟的弯曲机理仍然适用于夹芯板激光成形。然而，两种机制串联起作用，一个单独的机制负责固体面板和泡沫芯的变形。通过对弯曲机理的分析，得出了不同工艺条件下激光成形的最大可实现弯曲角和整体效率。在整个分析过程中，实验结果与采用不同几何方法的两种有限元模型获得的数值模拟相辅相成。
Over the past decade, laser forming has been effectively used to bend various metal foams, opening the possibility of applying these unique materials in new engineering applications. The purpose of the study was to extend laser forming to bend sandwich panels consisting of metallic facesheets joined to a metal foam core. Metal foam sandwich panels combine the excellent shock-absorption properties and low weight of metal foam with the wear resistance and strength of metallic facesheets, making them desirable for many applications in fields such as aerospace, the automotive industry, and solar power plants. To better understand the bending behavior of metal foam sandwich panels, as well as the impact of laser forming on the material properties, the fundamental mechanisms that govern bending deformation during laser forming were analyzed. It was found that the well-established bending mechanisms that separately govern solid metal and metal foam laser forming still apply to sandwich panel laser forming. However, two mechanisms operate in tandem, and a separate mechanism is responsible for the deformation of the solid facesheet and the foam core. From the bending mechanism analysis, it was concluded on the maximum achievable bending angle and the overall efficiency of the laser forming process at different process conditions. Throughout the analysis, experimental results were complemented by numerical simulations that were obtained using two finite element models that followed different geometrical approaches.