Strain rate and density-dependent strength of AlSi7 alloy foams

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• 作者：F. Campana^a ; ^{francesca.campana@uniroma1.it" class="auth_mail" title="E-mail the corresponding author} ; E. Mancini^b ; D. Pilone^c ; M. Sasso^b
• 关键词：Aluminium foams ; Dynamic crushing ; Hopkinson bar ; Mechanical characterisation
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：10 January 2016
• 年：2016
• 卷：651
• 期：Complete
• 页码：657-667
• 全文大小：2577 K

文摘

Foams are able to absorb energy and bear stress more uniformly and efficiently than the correspondent bulk materials. This makes them ideal candidates to increase the specific structure’s absorption efficiency.

Concerning their characterisation, there are still some open issues needing further investigations, such as the experimental analysis of their dynamic behaviour with alloy types, strain rates and foam density changes.

This paper focuses on the above mentioned issues presenting the results of a dynamic characterisation by means of a direct tension–compression Hopkinson bar. Tests are carried out on AlSi7 alloy foam specimens obtained from a large ingot made by compact powder technology. The results are discussed mainly in terms of strength and energy absorption efficiency, considering the effects of strain rate and of the variation of foam density, due to the manufacturing process.