Elasitc-plasitc Impact Of A Thin-walled Ring

Collision is a common phenomenon in daily life, transportation, aerospace engineering. In the traffic engineering, as the requirement of comfort and safety increasing day by day, more and more scientists and engineers pay attention to the research of energy absorption phenomenon and energy absorbers in collision course about vehicles. Ring and circular tube are the basest and the most common protective structures. It’s important to grasp the buckling modes, evolution of plastic deformation, characters of energy absorption and rebound of these fundamental elements in various collision conditions. Using ABAQUS software, this article has analyzed in detail the dynamic response and energy absorption capability of circular tubes.Firstly, the article introduces the quasi-static load-deflection relationships of circular tube,as well as analyzes theoretically conditions for circular tubes to form plastic hinges and the influence of material properties to deformation, followed by a brief exposition about how the circular tubes dynamically response under the impact impulse load.By FEM, this article makes a comprehensive and systematical simulation about how circular tubes response under quasi-state load, drop-hammer impact and free-impact onto a rigid target, analysing contact force, plastic hinges, distribution of every partial energy and energy absorption capability. Whilst, Comparing simulation and experiment, an analysis about the impact of material yield stress, strain harden and impact velocity. In general, we obtain a detailed systematic dynamic response analysis of thin-walled ring in different conditions, that can be used for engineering applications or theoretical analysis connected with thin-walled ring.