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该文基于Rayleigh梁理论,采用局部弹塑性接触模型,结合有限差分方法和碰撞-分离条件,研究了钝圆柱头质量水平碰撞自由梁过程中的弹塑性次碰撞过程。研究发现,整个水平碰撞包含了复杂的弹塑性次碰撞过程,整个碰撞过程由分别位于碰撞压缩相内和恢复相内的两个明显的次碰撞区组成。第二碰撞区的出现,导致梁出现了二次瞬态变形激发现象。碰撞激发了梁一阶位移响应和高阶速度响应,一阶位移响应与次碰撞区的形成有着本质的联系,次碰撞的形成过程与高阶速度响应密切相关。另外,次碰撞显著地改变了碰撞能量的传递方式,导致了单向、间歇式的碰撞能量传递模式。研究表明,次碰撞与次碰撞激发的自由梁响应之间存在着复杂的耦合力学机制。
Based on the Rayleigh beam theory and using the local elastic-plastic contact model, the finite element method and the collision-separation conditions are used to study the elasto-plastic sub-collision during the collision of free-grade cylindrical head with the free beam. The study shows that the entire horizontal collision involves a complex elasto-plastic sub-collision process, and the entire collision process consists of two obvious sub-collision zones located in the collision compression phase and the recovery phase, respectively. The emergence of the second collision zone, resulting in beams appeared second transient deformation excitation phenomenon. The first-order displacement response and the high-order velocity response are excited by the collision. The first-order displacement response is intrinsically linked with the formation of the secondary collision zone. The formation of the secondary collision is closely related to the high-order velocity response. In addition, the sub-collision significantly changes the way the collision energy is delivered, resulting in a one-way, intermittent collision energy transfer mode. The research shows that there is a complicated mechanism of coupling mechanics between the free beam responses of secondary collisions and secondary collisions.