Strain rate and temperature sensitivity and constitutive model of YB-2 of aeronautical acrylic polymer

To investigate dynamic mechanical performances of YB-2 aeronautical polymer used as the aircraft windshield in extreme mechanical environments, we performed uniaxial compression tests on cylindrical samples, using an Instron servo hydraulic axial testing machine and the compression Hopkinson bar at strain rates ranging from 10^-3 s^-1 to 3 000 s^-1 and at initial temperatures ranging from 218 K to 373 K, and obtained the true strain stress curves. Our results indicate that the Young's modulus and flow stress decrease as the temperature increases, while the fracture strain tends to increase as the temperature increases. At the same temperature, it was found the flow stress increases with the rising strain rate, and the strain softening effect was also observed to be more acute with the increasing strain rates. Based on the ZWT model, the parameters of a prediction model that takes temperature into consideration has been gained. The predictions are in good agreement with experimental results in the strain range of 8%.