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- W1973231337 abstract "Computer methods based on finite element analysis are able to predict the performance of plastics under impact loading. Although the accuracy of results depends on the model used to describe the deformation behaviour of the polymer, whichever model is used, the analysis requires stress/strain data over a wide range of strain rate. These data are most conveniently measured in tension, but procedures are currently not available for determining results at high strain rates. ISO standards for tensile property measurement are applicable for strain rates up to around 0.1 s−1. To simulate behaviour under impact, data are required at rates that are 3 or 4 orders of magnitude higher than this. For accurate data acquisition at these higher rates, attention needs to be paid to apparatus design in order to minimise contributions from transient forces arising from resonances and the propagation of shock waves in the apparatus. In addition, procedures and extensometers are not routinely available for determining strains at the higher rates of deformation. This paper illustrates the acquisition of data over a wide range of strain rates through a combination of measurements at low and moderate strain rates with extrapolation of these data to higher rates. In order to maximise accuracy at moderate strain rates, suitable designs need to be selected for the transducers, the test specimen geometry and the test assembly. Extrapolation is achieved by the use of mathematical functions to model the stress/strain curves and their rate dependence. Reference is also made to the development of a new materials model for describing the deformation behaviour of toughened plastics at large strains." @default.
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- W1973231337 date "2001-01-01" @default.
- W1973231337 modified "2023-10-14" @default.
- W1973231337 title "Modelling the behaviour of plastics for design under impact" @default.
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- W1973231337 doi "https://doi.org/10.1016/s0142-9418(01)00003-4" @default.
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