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2015 3rd International Conference on Machinery,Materials and Information Technology Applications(ICMMITA 2015)

作者： Wenxue Qian Xiaowei Yin Liyang Xie School of Mechanical Engineering and Automation Northeastern University Department of Mechanical Engineering Shenyang Institute of Engineering

bolt joints are widely used in all kinds of machines. The advantage of them is cheap and convenience. For different application fields, the structures of bolts are very different. They are typically lighter for the same strength and provide better heat conduction. As we know that do FEA（finite element analysis） is necessary before and after the bolts have been made. In this paper, a detail analysis was done with FEM（finite element method）, and the stress distribution of bolt joint was obtained. Also the FEA results show that the maximum stress is less than the yield stress and the stress concentration of the thread is relatively high.

关键词： Structural analysis Finite element analysis bolt joint

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Experimental study on anti-penetration mechanism of bolted composite protective structure with limited span under impact of low-velocity projectile

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Defence Technology（防务技术） 2022年第6期18卷 995-1005页

作者： Yu-jia Liu Dian Li Hai-liang Hou Zhu-jie Zhao Yue Xie College of Naval Architecture and Ocean Engineering Naval University of EngineeringWuhan430033China

In order to study the influence of the bolt joint mode on low-velocity projectiles penetrating the composite protective structure,two bolt joint models which connect the composite target to the fixed frame were designed,the ballistic test of the bolted composite protective structure with limited span was carried out,and the bearing and failure characteristics of the bolted region,as well as the energy dissipation of each part of the structure,were *** results show that in the condition of lowvelocity impact,there are three failure modes for the bolted composite protective structure subjected to projectile penetration,including failure of the impact point of the composite target,failure of protective structure connecting components and failure of the holes in the bolted region of the composite target;the failure mode of bolt holes in the bolted region has a great influence on the protection performance,and the allowable value of the bearing capacity of the bolted region depends on the sum of the minimum failure load in the failure modes and the friction force;shear-out failure occurring in the bolt holes in the bolted region exerts the greatest effect on ballistic performance,which should be avoided;When simultaneous failure occurs in the bolted region and the free deformation region of the composite protective structure,the energy absorption per unit surface density of the composite protective structure reaches the maximum,which can give full play to its anti-penetration efficiency.

关键词： Impact dynamics Composite protective structure bolt joint Ballistic test Failure modes

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