Quantitative Prediction of Impact Forces In Elastomers

[+] Author and Article Information
Suresh Goyal

Wireless Research Laboratory, Lucent Technologies Bell Laboratory, 600 Mountain Avenue, Rm. 1B-212, Murray Hill, NJ 07974

Ronald G. Larson

Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 53214

Charles J. Aloisio

Lucent Technologies Bell Laboratories, 2000 Northeast Expy, Rm. 2H37, Norcross, GA 30071

J. Eng. Mater. Technol 121(3), 294-304 (Jul 01, 1999) (11 pages) doi:10.1115/1.2812378 History: Received August 20, 1998; Revised December 18, 1998; Online November 27, 2007


We measure the impact forces and deflections resulting from drop tests of a mass with a flat impact surface onto flat pads of various elastomeric materials, and show that the forces can be predicted quantitatively with no adjustable parameters by using a theory whose only inputs are the linear viscoelastic characteristics of the materials, measured in small-amplitude oscillatory deformations. The theory, which models the elastomer as a nonlinear neo-Hookean material, is accurate for several elastomeric solids including polyurethanes, polynorbomene, and poly-vinyl-chlorides (PVCs), over a wide range of impact velocities, masses, temperatures and pad thicknesses. Some steps are taken to extend the model to surfaces which are not flat. The application in mind is the rational design of elastomeric components in impact-tolerant portable electronic equipment.

Copyright © 1999 by The American Society of Mechanical Engineers
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