Abstract:

In order to study the impact resistance ans energy absorption of warp-knitted spacer fabrics of different negative Poisson's ratios under low velocity impact, five fifferent auxetic warp-knitted samples were used for falling weight impact tests, and the influence relations of energy absorption rate and impact resistance to auxetic performance and initial impact energy were analyzed based on impact load-time curves and impacty load-displacement curves. Results show that the energy absorption rate and impact resistance increase with the increase of the negative Poisson's ratios value. The initial impact energy can also affect the energy absorption rate and impact resistance but have few influences on the overall energy absorption value of the fabrics under low velocity impact.

Key words: negative Poissin's ratio, warp-knitted spacer fabric, low velocity impact, energy absorption