Shock Tube Test for Energy Absorbing Materials.

摘要

This report describes the redesign and demonstration of an experiment, developed by the Natick Soldier Research, Development and Engineering Center (NSRDEC), to measure the response of energy absorbing materials behind a buffer material, loaded with the shockwave and dynamic pressure pulse in a shock tube. This test has application in the development of body armor for blast attenuation and impact attenuation. Foam materials are rapidly compressed between the striker (buffer) and fixed test plate at dynamic strain rates reaching peak levels between 500-1000/s. Foam stress is calculated by measuring the reaction force of the material with a dynamic load cell. Foam compression is measured through high speed video image analysis. With the current experimental set-up, the material test results are very similar to those obtained with a drop weight impact test.