期刊
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
卷 86, 期 -, 页码 265-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2015.08.013
关键词
Polycarbonate; Yield stress; Injection molding; Izod impact; Finite element simulation
资金
- 973 Program [2012CB025904]
- Fundamental Research Funds for the Central Universities [3102014JCS05003]
- National Natural Science Foundation of China [11302174]
The influence of the thermal history experienced during injection molding on the low-velocity impact behavior of polycarbonate (PC) is investigated. An integrated methodology consisting of prediction of the processing-induced yield stress and finite element simulation of the impact behavior is proposed. The yield stress is first evaluated directly from the temperature history experienced during injection molding process. A strain rate-dependent elastic-plastic model with the modification to combine the influence of processing thermal history is developed 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 measurement to verify the proposed methodology. In addition, a series of numerical simulations are performed to examine the influence of thermal history experienced during injection molding on the plastic deformation and fracture energy of PC specimens. (C) 2015 Elsevier Ltd. All rights reserved.
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