Abstract：Study on large deformation of steel tube under lateral impact is of great significance to the design of anti-explosion and anti-shock energy absorption equipment. According to the experiment results, a brief analysis of the buckling process of steel tube has been made. And deformation modes of dynamic buckling of the steel-tube in different stage are assumed also. Thinking tube is composed of rigid-plastic material simplifies the complicated problem. So the displacement and velocity fields are described. Besides, a modal method is employed based on the virtual velocity principle in order to convert this problem into equation with single variable and make it easy to figure out. Results show that modal solution is an effective method in analyzing response of structures and strain rate effect can’t be ignored.
2010, Vol. 29 
