Progress On Experimental And Finite Element
Studies Of Oblique Elastic Impact
Author(s)
P. P. Garland & R. J. Rogers
Abstract
Oblique elastic impact of nonconforming bodies is a special case of
stereomechanics that can occur in several engineering applications such as loose
fitting joints, robotic tasks and granular assemblies. Of particular interest in this
type of impact is the tangential force that develops between the colliding bodies
due to friction and tangential compliance. The solution of this problem is made
more difficult due to the constantly changing contact area over the duration of
impact. These factors lead to highly nonlinear force-displacement relationship
between the colliding bodies.
Analytical/numerical methods based on contact mechanics have shown the
tangential force waveform experienced when spherical bodies collide at low
velocities is dependent on the angle of incidence. At large angles of incidence,
full sliding of the bodies will occur. In this case, the tangential force will be
equal to the limiting Coulomb friction value. At smaller angles of incidence, the
bodies may have varying periods of full sliding, partial slipping or complete
sticking over the duration of impact. In these cases, the tangential force can be
expected to oscillate during impact.
Experimental testing and finite element modeling are currently being used to
verify the correctness of analytical/numerical solutions previously developed.
The experimental study uses a simple pendulum with a spherical steel striker.
Contact force data of the oblique impact event is collected using a single tri-axial
piezoelectric force transducer. The finite element model of the impact event is
coded using commercially available Abaqus/ExplicitTM software. The finite
element model also allows for exploration of the various stress distributions on
the contact surface of the colliding bodies. Preliminary results from both
methods indicate that the tangential force will oscillate for shallow angles of
incidence. However, comparisons of these methods to one another and to the
available solutions show significant characteristic differences.
Keywords: experimental impact, finite element analysis, contact forces,
Coulomb friction, shear stress, partial-slip distribution.
Keywords
experimental impact, finite element analysis, contact forces,
Coulomb friction, shear stress, partial-slip distribution.
Related Book
Other papers in this volume
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