Dynamic Response Of Complex Structures Under Impact And Vibration Loading

The research of dynamic response of materials and structures are very important and difficult during economic development and military technology application. Currently, there are three main ways which are theories research, experiment research and numerical simulation to solve these problems. To the problems of complex materials and structures, theories research can't solve them, experiment research needs much time and money, while with low expenditure and easy repetition which means to be carried out under different initial and boundary conditions with different materials conveniently, the numerical simulation way is used more and more widely. With the numerical simulation way including finite difference method and finite element method, the research of dynamic response of materials with complex constitutive equation considered damage and complex structures under several kinds of complex loads are made.In the first part of the paper, the research of the dynamic response and damage of shell structures is made. This work has an important and direct application foreground in the field of military effect, aviation and astronavigation. A high pressure and temperature area will be got inside shell by imploding load, and some reactions that can provide higher energy under severe initial conditions can be achieved, so it is very important to the research of new types of weapons. Based on the previous work, a type of damage criteria is applied to the problem of the damage in medium-thick spherical and cylindrical shells caused by the imploding loading with the finite difference method, and the spallation of shells is simulated well.The second part of the paper embeds the complex constitutive equations with three kinds of damage revolution models into the software ABAQUS by the way of the second development with the material constitutive interface. Three kinds of problems which are shells' damage caused by explosive loading, impact of plates and adiabatic shear band of WHA are simulated well. These three kinds of damage revolution models include mesoscale damage, phenomenological damage and adiabatic shear damage. Besides these, the previous damage revolution equation is improved, and the increase of kinetic energy of the medium around voids (inertia effect) is considered during the progress of voids growth. The model of the problem and the results are more reasonable.