A Testing Technique for Characterizing Composite at Strain Rates up to 100/s

Abstract

As the use of fiber composites extends to automotive applications, 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 rate investigations should become inadequate. A high-speed hydraulic testing machine may be suitable for the low strain rate testing, however, it is not necessary within the reach of general engineers due to its high cost. Based on a drop weight impact tester, this study presents an affordable testing technique for characterizing a carbon composite at low strain rates up to 125/s. Experimental results from static testing and slip Hopkinson’s bar testing were also performed for comparisons.