Abstract
Based on mechanical properties of Polyamide 66 (PA66) under complex loading conditions, a Drucker–Prager yield criterion was employed to characterize its yield behavior. Then, a one-dimensional model, which contains a viscoelastic regime and a viscoplastic regime, was introduced and converted into a three-dimensional constitutive model. The three-dimensional model was implemented into a LS-DYNA software, which was used to predict the dynamic response of PA66 under Taylor impact conditions, whose corresponding tests were conducted by gas gun and recorded by high-speed camera. By contrasting the simulation results and these of the corresponding tests, the deformed shapes including the residual length, the maximum diameter and the shape of the mushroom head of the PA66 bars were found to be similar to these obtained from the tests, which verified the accuracy of the three-dimensional constitutive model, and proved that the model was able to be applied to high-rate impact loading conditions.
Highlights
Semi-crystalline polymer materials possess low density and good toughness, so they are widely applied in many aspects, such as bullet cores and electromotive tools
Serval sets of Taylor impact tests were performed to verify the accuracy of the three-dimensional constitutive model, and proved that the model was able to be applied to high-rate impact loading conditions
It is found that the collision results in formation of a mushroom headcamera at the impact end, which enlarges along radial direction and the plastic zone expend to back end as the and shown in
Summary
Semi-crystalline polymer materials possess low density and good toughness, so they are widely applied in many aspects, such as bullet cores and electromotive tools. It is well-known that these bullet cores and electromotive tools are always subjected to extreme loadings. It is necessary to study their mechanical properties under complex loading conditions, and the research results are able to guide us to use these polymers safely. Tensile and compressive behaviour of semi-crystalline polymers has been studied under complex conditions (various temperatures and strain rates) [1,2,3]. Dynamic properties of polyethylene were studied over high strain rates by Xu et al [4]. Omar et al [5] studied the influence of strain-rate on three kinds of polymeric materials: polycarbonate (PC), polypropylene (PP)
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