Experimental and Constitutive Model on Dynamic Compressive Mechanical Properties of Aluminum Foams under RepeatedImpacts

doi:10.3969/j.issn.1000-1093.2018.12.015

Abstract

Abstract: In order to investigate the dynamic mechanical properties of aluminum foams under repeated impact loading, the impact tests were performed using spilt Hopkinson pressure bar. The effect of cumulative damage on the dynamic mechanical properties and energy absorption characteristics of the material is studied by analyzing the changes of damage morphology, wave transmittance, stress-strain curve and energy absorption efficiency of aluminum foams with the number of impact loading. The results show that, with the increase in impact time, the cell structure in aluminum foam collapses progressively, the attenuation of stress wave weakens, the elastic limit stress and corresponding strain are enhanced, and the cumulative effect of damage on aluminum foams under repeated impact is helpful to improve the ideal energy absorption efficiency. Based on the measured stress-strain curves , the damage accumulative variables are introduced into the Sherwood-Frost equation. A damage cumulative constitutive model of aluminum foams under repeated impact is established. the influence of the difference between the damage cumulative energy corresponding to the reference curve of shape function and the cumulative energy in multiple impact test on the prediction accuracy of the constitutive model is analyzed and is experimentally verified. Key

Key words: aluminumfoam, dynamiccompression, energyabsorptionefficiency, damageaccumulation, constitutivemodel

CLC Number:

O347.7

GAO Hua， XIONG Chao， YIN Jun-hui. Experimental and Constitutive Model on Dynamic Compressive Mechanical Properties of Aluminum Foams under RepeatedImpacts[J]. Acta Armamentarii, 2018, 39(12): 2410-2419.

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第39卷第12期
2018 年12月兵工学报ACTA
ARMAMENTARIIVol.39No.12Dec. 2018

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