Metal to composite bolted joint behavior evaluated at impact rates of loading
Metal to composite bolted joint behavior evaluated at impact rates of loading
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DOI：
10.1016/j.compstruct.2013.06.004
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发表时间：
2013-12
影响因子：
6.3
通讯作者：
Andy Vanderklok;Abhishek Dutta-;S. A. Tekalur
中科院分区：
文献类型：
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作者：
Andy Vanderklok;Abhishek Dutta-;S. A. Tekalur
金属复合材料螺栓接头是大多数结构部件的组成部分，广泛应用于飞机和汽车工业，它们可能承受静态或随时间变化的载荷。存在大量文献讨论静态负载率下螺栓接头的行为。然而，定义金属复合材料螺栓接头在动态加载速率下的机械响应的研究有限。这对于更好地了解其承受冲击载荷时的耐撞特性至关重要。在我们当前的研究中，我们尝试通过使用分离式霍普金森拉杆在冲击载荷下对 4142 合金钢-E 玻璃层环氧树脂复合材料螺栓接头进行实验表征来解决这个问题。同时还进行了准静态测量，不仅可以区分最大轴承强度，还可以区分不同边缘距离与孔径 (e/d) 比率对应的失效操作模式。据观察，金属复合材料螺栓接头的动态响应明显高于其静态对应物。存在失效模式改变的渐近区域，并且观察到该渐近区域依赖于负载率转移。这项研究为协助螺栓接头的后续设计提供了有益的信息，其中冲击载荷下的行为是主要关注点。
Metal-composite bolted joints form an integral part of a majority of structural components and finds extensive usage in aircraft and automobile industries where they could be subjected to either static or time dependent loadings. Extensive literature exists addressing bolted joint behavior under static rates of loading. However, limited studies exist which define mechanical response of metal-composite bolted joints under dynamic rates of loading. This is vital to better understand its crashworthiness characteristics when it is subjected to impact loading. In our current investigation, we have attempted to address this aspect via experimental characterization of 4142 alloy steel-E glass ply epoxy resin composite bolted joint under impact loading using a split Hopkinson tension bar. Quasi-static measurements have also been conducted simultaneously to distinguish not only the maximum bearing strength but also the operational modes of failure corresponding to different edge distance to hole diameter (e/d) ratios. Dynamic response of the metal-composite bolted joint was observed to be significantly higher than its static counterpart. Asymptotic region of failure mode alteration exists and is observed to be dependent on loading rate transfer. This study provides beneficial information in assisting subsequent design of bolted joints where behavior under impact loading is of main concern.