Abstract
The development of lightweight, impact-resistant, and high energy-consuming materials is of great significance for improving the defense capabilities of military equipment. As a new type of damping material, metal rubber has demonstrated great potential for application in the field of impact protection. In this paper, the dynamic mechanical response of metal rubber under a high strain rate is studied, which provides a new idea for developing high-performance protective materials. The stress-strain curves, energy absorption performance, and wave transmission performance of metal rubber at various strain rates were investigated based on a split-Hopkinson pressure bar (SHPB) device. The dynamic stress-strain curve of metal rubber is divided into three stages: elastic stage, plastic stage, and failure stage. The optimal energy absorption efficiency is greater than 0.5, and the maximum value can reach 0.9. The wave transmittance is less than 0.01. The dynamic mechanical tests have proved that metal rubber has excellent energy absorption capacity and impact resistance property. A constitutive model based on Sherwood–Frost was established to predict the dynamic mechanical behavior of metal rubber. The results of comparison between the calculation and the experiment show that the constitutive model can accurately predict the dynamic mechanical performance of metal rubber.
Highlights
In recent years, military conflicts, violent incidents, and terrorist attacks still happen occasionally. erefore, countries all over the world are committed to conducting research of lightweight, antiexplosion, and impact-resistant materials to meet urgent needs for protection of military equipment.At present, foamed aluminum, rubber, and fiber composites are widely used because of their good energy absorption properties. e research studies on the dynamic mechanical properties of these materials are mostly investigated based on split-Hopkinson pressure bar (SHPB) tests
Hu et al [2] proposed the use of vacuumassisted resin infusion to prepare flax fiber reinforced composites (FFRCs). e experiment used the SHPB device to impact FFRCs and evaluated the dynamic response of FFRCs from the macroscopic and microscopic failure mechanism
It was shown that FFRCs had good energy absorption performance under high-velocity impact
Summary
Military conflicts, violent incidents, and terrorist attacks still happen occasionally. erefore, countries all over the world are committed to conducting research of lightweight, antiexplosion, and impact-resistant materials to meet urgent needs for protection of military equipment.At present, foamed aluminum, rubber, and fiber composites are widely used because of their good energy absorption properties. e research studies on the dynamic mechanical properties of these materials are mostly investigated based on split-Hopkinson pressure bar (SHPB) tests. Erefore, countries all over the world are committed to conducting research of lightweight, antiexplosion, and impact-resistant materials to meet urgent needs for protection of military equipment. At present, foamed aluminum, rubber, and fiber composites are widely used because of their good energy absorption properties. E research studies on the dynamic mechanical properties of these materials are mostly investigated based on split-Hopkinson pressure bar (SHPB) tests. Amaro et al [1] studied the influence of structure and material on the dynamic mechanical properties of foamed aluminum. It was shown that FFRCs had good energy absorption performance under high-velocity impact. Li et al [3] studied the dynamic mechanical properties and energy absorption characteristics of high-damping rubber under SHPB highspeed impact. E results revealed that the high-damping rubber had good energy absorption performance and the energy absorption ability increased with the increasing strain rate. The research on the abovementioned materials has matured considerably, and it is difficult to further improve their performance. erefore, it is necessary to develop new materials with excellent performance
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