Experimental and numerical study of strain rate effect on mechanical behavior of material extruded ABS reinforced with short carbon fibers
摘要
Composite materials with polymer matrices manufactured by material extrusion based additive manufacturing demonstrate superior mechanical properties compared to their counterpart made with standard thermoplastic parts. However, these materials are sensitive to variation in the applied strain during tensile tests. In this study, the effect of the variation in the strain rate (from 10− 3s− 1 to 10− 1s− 1) on the mechanical behavior of carbon fiber reinforced polymer (CFRP) parts obtained by material extrusion (MEX) process is investigated experimentally and numerically. The two-layer viscoplastic model (TLVM) is used to predict the mechanical behavior obtained from tensile tests with different strain rates. The elastoplastic and viscoelastic behaviors are considered in each layer of the model. The TLVM accurately predicts the strain rate sensitivity of the material extruded (MEX-ed) parts regarding the experimental results. A strong correlation is observed between the model predictions and the experimental measurements for all applied strain rates, confirming the model’s ability to capture the rate-dependent mechanical response. The fractographies of the tested samples at different strain rates confirm that the ductility decreases with the increase in the strain rate. Young’s modulus increase considerably when the strain rate increases from 1.4 ×10− 3s− 1 to 1.4 × 10− 1s− 1.