非線型緩衝材の衝撃応答II

抄録

The shock response of nonlinear spring which has weak damping is available to find the static characteristic of the spring, and numerical solutions from step excitation are given in this paper. But this dynamic solutions are not applicable to the porous cushioning material such as poly-urethane foam, for the effect of the air flow resistance in the porous media. Then the influence of the fundamental wave and its harmonic wave of velocity component on damping and dynamic stress-strain curve are studied by the theories of steady and unsteady laminar boundary layer flow. The theoretical values are nearly coincident with the values experimentally obtained.