Abstract
A comprehensive understanding of the mechanical behavior of polycarbonate (PC) under high-rate loadings is essential for better design of PC products. In this work, the mechanical behavior of PC is studied during tensile loading at high strain rates, using a split Hopkinson tension bar (SHTB). A modified experimental technique based on the SHTB is proposed to perform the tension testing on PC at rates exceeding 1000 s−1. The effect of strain rates on the tension stress–strain law of PC is investigated over a wide range of strain rates (0.0005–4500 s−1). Based on the experiments, a physically based constitutive model is developed to describe the strain rate dependent tensile stress–strain law. The high rate tensile deformation mechanics of PC are further studied via finite element simulations using the LSDYNA code together with the developed constitutive model.
Highlights
Polycarbonate (PC) is a thermoplastic polymeric material with high transparency, high ductility, impact resistance and is comparatively lightweight
An accurate understanding and modeling of the mechanical behavior of PC at high strain rates is of great importance
The mechanical behavior of materials at high strain rates has been extensively studied using various experimental procedures ranging from impact tests [3] to split Hopkinson pressure bar (SHPB) test [4]
Summary
Polycarbonate (PC) is a thermoplastic polymeric material with high transparency, high ductility, impact resistance and is comparatively lightweight. The mechanical behavior of materials at high strain rates has been extensively studied using various experimental procedures ranging from impact (gas gun impact, Taylor impact, and Izod impact) tests [3] to split Hopkinson pressure bar (SHPB) test [4]. The subsequent reflected tensile pulse (from the free rear end of the second bar) loaded the sample By using this split-collar type SHTB, the effects of varying strain rate, overall imposed strain magnitude and specimen geometry on the mechanical response were examined in details. Based on the high-rate tensile experiment investigation, Cao et al [18] developed a physically based three-dimensional elastic-plastic constitutive model to characterize the rate-temperature dependent yield and post-yield behavior of PC when subjected to tension loading.
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