High Strain-Rate Compressive Behavior and Constitutive Modeling of Selected Polymers Using Modified Ramberg-Osgood Equation

Abstract:

The present paper is concerned with constitutive modeling of the compressive stress-strain behavior of selected polymers at strain rates from 10^-3 to 10³/s using a modified Ramberg-Osgood equation. High strain-rate compressive stress-strain curves up to strains of nearly 0.08 for four different commercially available extruded polymers were determined on the standard split Hopkinson pressure bar (SHPB). The low and intermediate strain-rate compressive stress-strain relations were measured in an Instron testing machine. Six parameters in the modified Ramberg-Osgood equation were determined by fitting to the experimental stress-strain data using a least-squares fit. It was shown that the monotonic compressive stress-strain behavior over a wide range of strain rates can successfully be described by the modified Ramberg-Osgood constitutive model. The limitations of the model were discussed.

• Periodical: Applied Mechanics and Materials (Volume 566)
• Pages: 80-85
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.566.80
• Online since: June 2014
• Authors: Kenji Nakai*, Takashi Yokoyama
• Keywords: Compressive Stress-Strain Behavior, Constitutive Modeling, Hopkinson Bar, Modified Ramberg-Osgood Equation, Polymer, Strain Rate

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