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Article: Effect of mean strain on the cyclic deformation and stress relaxation in polypropylene.
- Article from:
- Polymer Engineering and Science
- Article date:
- September 1, 1995
- Author:
CopyrightCOPYRIGHT 1995 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
Cyclic deformation and stress relaxation after cyclic preloadings in polypropylene have been studied in a push-pull tension-compression mode by using a closed-loop, electrohydraulic, servocontrolled testing machine (1, 2). The data were compared with theoretical results analyzed by using a linear viscoelastic model (3, 4) and an overstress model (5, 6). An equilibrium stress and a viscosity function were treated in the overstress theory. The calculated results based on the overstress theory agree well with experiment in both the stress-strain and the stress-relaxation curves. It was concluded that the overstress theory explained the nonlinear ...
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