刚性质量对自由梁的塑性次撞击  

Sub-plastic Impacts of Rigid Mass on Free-free Beam

作　　者：杨钧[1] 尹晓春[1] 刘中华 骞朋波[1] 

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]上海飞机客户服务有限公司技术出版物部,上海200241

出　　处：《南京理工大学学报》2011年第6期837-842,共6页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(10872095);江苏省自然科学基金(BK2008408)

摘　　要：针对接触和分离对撞击响应的影响,该文基于刚塑性动力学理论和单轴压缩多次弹塑性接触模型,研究了刚性质量水平撞击自由梁的过程。研究结果发现该撞击过程是一个复杂的多次塑性撞击过程,按照撞击力变化形式可以划分为两个撞击区,计算结果表明该两个撞击区的总冲量相当。塑性次撞击造成撞击能量以间歇方式传递,并且大部分撞击能量是由后续次撞击传递给梁的。不断出现的次撞击将迫使移行塑性铰作短暂的往复运动。通过与三维动态有限元方法的比较表明,刚塑性动力学理论可以应用于塑性次撞击问题的研究,并可获得梁撞击响应的主要特征。Aiming at the effects of contact and separation on impact response,the process of a free-free beam struck horizontally by a rigid mass is investigated based on a uniaxial compression multiple-elastic-plastic contact model and rigid-plastic dynamics.The results show：such a horizontal strike is a complicated process of multiple plastic impacts;two impact zones can be divided by the variation of impact force.The calculation results show that the two impact zones have roughly the same impulse.The sub-plastic impact forms the intermittent type of impact energy transfer and most of the impact energy is transferred by the subsequent sub-plastic impacts to the beam.The sub-plastic impacts appearing continually cause the traveling plastic hinge to move back and forth transiently.The comparison with the three-dimensional dynamic finite element method shows that the rigid plastic theory can be applied to solve the sub-plastic impact problem and to obtain the main characteristics of impact responses of the beam.

关 键 词：刚性质量 自由梁 塑性次撞击 刚塑性动力学 

分 类 号：O347.1[理学—固体力学] O313.4[理学—力学]