Original paper(Vol.47 No.5 pp.458)

Energy absorbing characteristics of GF/Nylon tubes effect of trigger geometry and testing speed on energy absorption

Kawada Hiroyuki; Honda Takeshi; Takashima Maiko; Satoh Hajime

Abstract:In this paper, compression tests in GF/Nylon6 tubes were performed to clarify the mechanism of the initial failure process and the characteristic of the energy absorption. It was found that all the specimens were crushed in a progressive crushing mode regardless of the trigger geometry, but that the specimens with an asymmetric trigger demonstrated to have a better energy absorbing characteristic than that with a symmetric one. The formation mechanism of the debris wedge was examined through the step wise morphology analysis. It was also found that changes in the trigger geometries affected the performance of the initial failure process which was characterized by the debris wedge formation process. As for an effect of testing speed on the specific energy absorbing capability, the GF/Nylon6 tubes had small dependency of the testing speed in the range of our study comparing CF/PPEK tubes. From those results, it could be concluded that the GF/Nylon6 tubes are available to practical use.

Key Words:GF/Nylon6, specific energy adsorption, progressive crushing morphology, trigger geometry