Abstract
Compressive stress-strain loops of selected polymers at strain rates up to nearly 800/s are determined in a strain range of nearly 8% on the standard split Hopkinson pressure bar. Four different commercially available extruded polymers are tested at room temperature. The compressive stress-strain loops at low and intermediate strain rates are measured on an Instron testing machine. The effects of strain rate on the Young's modulus, flow stress and dissipation energy are discussed. It is shown that the area included within the stress-strain loop increases with increasing strain rate as well as a given strain, that is, all four extruded polymers tested exhibit intrinsic strain-rate dependent viscoelastic behavior and a high elastic aftereffect following complete unloading.
Highlights
Polymeric materials with low mechanical impedance have widely been used in automotive, aerospace and portable electronics applications for shock and vibration absorption
The compressive stress-strain loops at low and intermediate strain rates were measured on an Instron 5500R testing machine
It is shown that the area enclosed by the stress-strain loop increases with increasing strain rate as well as strain, that is, all four polymers tested display inherent strain-rate dependent viscoelastic behavior and delayed reversible deformation following complete unloading
Summary
Polymeric materials with low mechanical impedance have widely been used in automotive, aerospace and portable electronics applications for shock and vibration absorption. In order to ensure the structural integrity of these applications from the product design stage, it is needed to have a precise knowledge of the stress-strain and energy dissipation behavior of these materials under impact loading. The dynamic compressive [1,2,3], tensile [4, 5] and torsional [6] stress-strain responses of various polymers have often been determined on the conventional [7] or modified split Hopkinson pressure bar (SHPB). The purpose of the present paper is to obtain valid compressive stress-strain loops of selected polymers at strain rates up to about 800/s using the conventional SHPB. The compressive stress-strain loops at low and intermediate strain rates were measured on an Instron 5500R testing machine. It is expected that the present results will lead to a better understanding of the dynamic mechanical response of polymers
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