Dynamic penetration of cellular solids: Experimental investigation using Hopkinson bar and computed tomography

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:800

Article

Sleichrt, Jan¹  Fila, Tomas¹  Koudelka, Petr^1,5  Adorna, Marcel¹  Falta, Jan¹  Zlamal, Petr^1,5  Glinz, Jonathan²  Neuhaeuserova, Michaela¹  Doktor, Tomas¹  Mauko, Anja³  Kytyr, Daniel⁵  Vesenjak, Matej³  Duarte, Isabel⁴  Ren, Zoran³  Jirousek, Ondrej¹ 

[1] Czech Tech Univ, Fac Transportat Sci, Konviktska 20, Prague 11000, Czech Republic

[2] Univ Appl Sci Upper Austria, Stelzhamerstr 23, A-4600 Wels, Austria

[3] Univ Maribor, Fac Mech Engn, Smetanova Ul 17, Maribor 2000, Slovenia

[4] Univ Aveiro, Dept Mech Engn, Ctr Mech Technol & Automat, P-3810193 Aveiro, Portugal

[5] Czech Acad Sci, Inst Theoret & Appl Mech, Prosecka 809-76, Prague 19000, Czech Republic

关键词: Cellular materials;    Dynamic penetration;    Hopkinson bar;    Digital image correlation;    X-ray computed micro-tomography;   

DOI  :  10.1016/j.msea.2020.140096

来源: Elsevier

【 摘 要 】

Light-weight cellular solids, such as aluminium foams, are promising materials for use in ballistic impact mitigation applications for their high specific deformation energy absorption capabilities. In this study, three different types of aluminium alloy based in-house fabricated cellular materials were subjected to dynamic penetration testing using an in-house experimental setup to evaluate their deformation and microstructural response. A two-sided direct impact Hopkinson bar apparatus instrumented with two high-speed cameras observing the impact area and the penetrated surface of the specimens was used. An advanced wave separation technique was employed to process the strain-gauge signals recorded during the penetration. The images captured by one of the cameras were processed using an in-house Digital Image Correlation method with sub-pixel precision, that enabled the validation of the wave separation results of the strain-gauge signals. The second camera was used to observe the penetration into the tested specimens for the correct interpretation of the measured signals with respect to the derived mechanical and the microstructural properties at the different impact velocities. A differential X-ray computed tomography of the selected specimens was performed, which allowed for an advanced preand post-impact volumetric analysis. The results of the performed experiments and elaborate analysis of the measured experimental data are shown in this study.

【 授权许可】

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