Abstract: The present investigation is concerned with
sub-impacts taken placed when a rigid hemispherical-head block
transversely impacts against a beam at different locations. Dynamic
substructure technique for elastic-plastic impact is applied to solve
numerically this problem. The time history of impact force and energy
exchange between block and beam are obtained. The process of
sub-impacts is analyzed from the energy exchange point of view. The
results verify the influences of the impact location on impact duration,
the first sub-impact and energy exchange between the beam and the
block.
Abstract: Based on Rayleigh beam theory, the sub-impacts of a
free-free beam struck horizontally by a round-nosed rigid mass is
simulated by the finite difference method and the impact-separation
conditions. In order to obtain the sub-impact force, a uniaxial
compression elastic-plastic contact model is employed to analyze the
local deformation field on contact zone. It is found that the horizontal
impact is a complicated process including the elastic plastic
sub-impacts in sequence. There are two sub-zones of sub-impact. In
addition, it found that the elastic energy of the free-free beam is more
suitable for the Poisson collision hypothesis to explain compression
and recovery processes.