Abstract
In this study, an integrated methodology for impact analysis of polycarbonate (PC) product is proposed which incorporates the processing-induced inhomogeneity of yield stress. A previously developed model is extended to predict the inhomogeneous yield stress distribution along the specimen by using the thermal history experienced during injection molding. A strain rate-dependent elastic-plastic model combining the processing-induced yield stress is applied to model the mechanical behavior of PC. Finite element simulation for notched Izod impact test is then conducted to analyze the impact behaviors of PC specimens with different thermal histories. Numerical results of the fracture energies are compared with experimental measurements.
Highlights
Polycarbonate (PC) is frequently used in impact protection applications, including aircraft canopies, face shields, goggles, and windshields, windows and blast shields, due to a combination of high transparency and impact resistance
In our previous study [22], we developed an integrated methodology which combines the evaluation of the yield stress of PC after processing and the finite element computation of the impact behavior for simple-shaped PC specimens in a low velocity Izod impact test
An integrative simulation framework is developed to incorporate the inhomogeneous yield stress distribution induced by injection molding into the mechanical
Summary
Polycarbonate (PC) is frequently used in impact protection applications, including aircraft canopies, face shields, goggles, and windshields, windows and blast shields, due to a combination of high transparency and impact resistance. Impact response of the PC product is a subject of critical interest. For a correct and safe PC product design, the understanding of its mechanical performance under impact loading is of utmost importance. Gas gun impact tests were carried out by Gunnarson, et al [1], Qasim [2], Mckenzie, et al [3], Wright, et al [4], and Li and Goldsmith [5] to investigate the deformation and fracture mechanisms of thin PC plates under high velocity impact. Izod impact tests were widely used to study the low velocity impact behavior of PC, such as Fraser, et al [6], Cheng, et al [7], Lombardo, et al [8], and Inberg, et al [9]
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