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Characterizing Composites at Low Strain Rates

DAHSIN LIU, JIANXIAO ZHENG, DAN SCHLEH, GUOJING LI

Abstract


As the use of fiber-reinforced polymer-matrix composites gains momentum in automotive designs, there is a need to characterize the composite properties at low strain rates, such as below 100/s. In performing such low strain rate tests, the commonly used split Hopkinson’s pressure bar for high strain rates should become overqualified. A high-speed hydraulic testing machine may be suitable for the low strain rate testing. However, due to its high cost, it is not necessarily available to general laboratories. Based on a conventional drop weight impact tester (DWIT), this study presents an affordable testing technique for characterizing a glass woven composite at low strain rates, such as up to 100/s.

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