Conclusions
The major conclusions are:
i) Tangential elasticity, hitherto disregarded, exerts
considerable influence at low angles of incidence. Error
will be incurred if the impact response is determined
from simple rigid-body theory. As an instance of this,
for a disc, the tangential impulse, calculated from
simple theory, is only 67% of that predicted by complex
theory at ~i = 2.8.
ii) The coefficient of friction, in impact between steel
bodies, appears to be only slightly affected by wide
variations in input conditions.
iii) The response of bodies in oblique impact, though due
to highly localised interaction, appears to be closely
predicted using the bulk properties of the colliding
materials.