Experimental study on dynamic tensile behaviour of a kind of fiber silk

An improved split Hopkinson bar was used for testing the dynamic tensile behaviour of low strength materials. This device included an aluminum transmitted bar and the semiconductor gages to capture the weak strain signal. For material of aramid fiber silk, the stress equilibrium on both sides of specimen as well as the test speed was verified; a comparison between the measurements from semiconductor strain gauge and from resistance strain gauge was made; the stress-strain curves of tested material under various impact velocities were obtained; the failure process of specimen was captured by a high-speed camera. The experimental results show that the design of the experiment method is feasible.