Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading
In this study, a compressive impact test was conducted using the split Hopkinson pressure bar (SHPB) method to investigate SMA fiber-reinforced mortar’s impact behavior. A 1.5% fiber volume of crimped fibers and dog-bone-shaped fibers was used, and half of the specimens were heated to induce recover...
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doaj-91b92bad2a8549da81b850a52911f97a2021-09-09T13:51:10ZengMDPI AGMaterials1996-19442021-08-01144933493310.3390/ma14174933Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive LoadingEusoo Choi0Ha-Vinh Ho1Junwon Seo2Department of Civil and Environmental Engineering, Hongik University, Seoul 04066, KoreaDepartment of Civil and Environmental Engineering, Hongik University, Seoul 04066, KoreaDepartment of Civil and Environmental Engineering, South Dakota State University, Brookings, SD 57007, USAIn this study, a compressive impact test was conducted using the split Hopkinson pressure bar (SHPB) method to investigate SMA fiber-reinforced mortar’s impact behavior. A 1.5% fiber volume of crimped fibers and dog-bone-shaped fibers was used, and half of the specimens were heated to induce recovery stress. The results showed that the appearance of SMA fibers, recovery stress, and composite capacity can increase strain rate. For mechanical properties, the SMA fibers reduced dynamic compressive strength and increased the peak strain. The specific energy absorption of the reinforced specimens slightly increased due to the addition of SMA fibers and the recovery stress; however, the effect was not significant. The composite behavior between SMA fibers and the mortar matrix, however, significantly influenced the dynamic compressive properties. The higher composite capacity of the SMA fibers produced lower dynamic compressive strength, higher peak strain, and higher specific energy absorption. The composite behavior of the dog-bone-shaped fiber was less than that of the crimped fiber and was reduced due to heating, while that of the crimped fiber was not. The mechanical properties of the impacted specimen followed a linear function of strain rate ranging from 10 to 17 s<sup>−1</sup>; at the higher strain rates of about 49–67 s<sup>−1</sup>, the linear functions disappeared. The elastic modulus of the specimen was independent of the strain rate, but it was dependent on the correlation between the elastic moduli of the SMA fibers and the mortar matrix.https://www.mdpi.com/1996-1944/14/17/4933split Hopkinson pressure bar (SHPB)SMA fibersimpact compressive loadingenergy absorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Eusoo Choi Ha-Vinh Ho Junwon Seo |
spellingShingle |
Eusoo Choi Ha-Vinh Ho Junwon Seo Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading Materials split Hopkinson pressure bar (SHPB) SMA fibers impact compressive loading energy absorption |
author_facet |
Eusoo Choi Ha-Vinh Ho Junwon Seo |
author_sort |
Eusoo Choi |
title |
Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading |
title_short |
Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading |
title_full |
Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading |
title_fullStr |
Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading |
title_full_unstemmed |
Dynamic Behaviors of Mortar Reinforced with NiTi SMA Fibers under Impact Compressive Loading |
title_sort |
dynamic behaviors of mortar reinforced with niti sma fibers under impact compressive loading |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-08-01 |
description |
In this study, a compressive impact test was conducted using the split Hopkinson pressure bar (SHPB) method to investigate SMA fiber-reinforced mortar’s impact behavior. A 1.5% fiber volume of crimped fibers and dog-bone-shaped fibers was used, and half of the specimens were heated to induce recovery stress. The results showed that the appearance of SMA fibers, recovery stress, and composite capacity can increase strain rate. For mechanical properties, the SMA fibers reduced dynamic compressive strength and increased the peak strain. The specific energy absorption of the reinforced specimens slightly increased due to the addition of SMA fibers and the recovery stress; however, the effect was not significant. The composite behavior between SMA fibers and the mortar matrix, however, significantly influenced the dynamic compressive properties. The higher composite capacity of the SMA fibers produced lower dynamic compressive strength, higher peak strain, and higher specific energy absorption. The composite behavior of the dog-bone-shaped fiber was less than that of the crimped fiber and was reduced due to heating, while that of the crimped fiber was not. The mechanical properties of the impacted specimen followed a linear function of strain rate ranging from 10 to 17 s<sup>−1</sup>; at the higher strain rates of about 49–67 s<sup>−1</sup>, the linear functions disappeared. The elastic modulus of the specimen was independent of the strain rate, but it was dependent on the correlation between the elastic moduli of the SMA fibers and the mortar matrix. |
topic |
split Hopkinson pressure bar (SHPB) SMA fibers impact compressive loading energy absorption |
url |
https://www.mdpi.com/1996-1944/14/17/4933 |
work_keys_str_mv |
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