低应变率荷载作用下梯度泡沫铝力学性能研究

doi:10.11896/cldb.22010266

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Abstract The energy absorption characteristics of foamed aluminum will be deteriorated, when it is subjected to occasional low-speed loads. In this work, the quasi-static mechanical properties of single-layer and gradient foamed aluminums were studied. The compressive properties of gradient foamed aluminums were tested at different strain rates (4×10^-4 s^-1, 3×10^-3 s^-1, 1×10^-2 s^-1), and the failure modes of compressive deformation were measured by X-ray computed tomography (X-CT). The effects of strain rate and relative density on the compression and energy absorption of gradient foamed aluminums were investigated. The experimental results showed that under low speed loads, uniform foamed aluminum deformed along the weakest area of wall thickness till failure, while gradient foamed aluminum collapsed layer by layer. At the same strain rate, the strengthening tendency ability of foamed aluminums increased gradually with the increase in relative density, and the strain rates sensitivity coefficients of gradient and single-layer foamed aluminums were up to 0.235 and 0.210, respectively. The initial collapses stress and pla-teau stress of foamed aluminums increased with the strain rate. The initial collapses stress and plateau stress of gradient(MMH) and single-layer(H) foamed aluminums increased to 10.02 MPa, 10.7 MPa and 12.89 MPa, 10.19 MPa, respectively. Compared with the uniform foamed aluminum, the energy absorption maximum value of gradient foamed aluminum decreased by 9%. In this work, the design method of optimal design stress and energy absorption point was proposed, aiming to improve the energy absorption efficiency of foamed aluminum. We expect to provide a certain reference for the design of the protective panel of the foamed aluminum sandwich structure.

Key words： gradient foamed aluminum low strain rate X-ray computed tomograph (X-CT) relative density energy absorption

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TU512.4

Fund:National Natural Science Foundation of China (51908182), Natural Science Foundation of Hebei Province (E2020202043, E2019202484), and Funds of Key Laboratory of Materials Technology for Impact Environment (6142902200304).

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	LIU Xiongfei
	HE Ximin

Cite this article:

LIU Xiongfei,HE Ximin. Study on Mechanical Properties of Gradient Aluminum Foam Under Low Strain Rate Loading[J]. Materials Reports, 2023, 37(7): 22010266-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22010266 OR http://www.mater-rep.com/EN/Y2023/V37/I7/22010266

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