Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys
The failure response of aluminum alloys (Al-6061 and Al-7075) under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found t...
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doaj-b9899a67b0964a04b46fae196bdf4e722020-11-24T21:11:29ZengMDPI AGApplied Sciences2076-34172017-04-017546410.3390/app7050464app7050464Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum AlloysMohsan Jelani0Zewen Li1Zhonghua Shen2Maryam Sardar3School of Science, Nanjing University of Science and Technology, Nanjing 210094, ChinaAdvanced Launching Co-innovation Centre, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Science, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Science, Nanjing University of Science and Technology, Nanjing 210094, ChinaThe failure response of aluminum alloys (Al-6061 and Al-7075) under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found that the yield stress decreased with increasing laser power density. This implies that the load-bearing capacity of the specimens reduced under increased thermal or tensile loading. Consequently, the specimen’s failure time was shortened by increasing either laser power density or preloaded speed. For Al-6061, a remarkable reduction in failure time by the increase of laser power density is found. However, for Al-7075, under higher preloaded speeds, comparatively smaller impact of laser power density on the failure time is reported. Moreover, for Al-6061, relatively a more non-uniform variation in the average failure time with the increase of laser power density or preloaded speed is observed. The failure mode of Al-6061 turned from brittle to ductile at higher laser power densities; whereas for Al-7075, it changed from quasi-brittle to ductile. At higher preloaded speeds, a greater degree of melting and ablation phenomenon can be seen due to relatively higher temperatures and higher heating rates.http://www.mdpi.com/2076-3417/7/5/464Al-alloysCW lasertensile loadingstructural failure |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohsan Jelani Zewen Li Zhonghua Shen Maryam Sardar |
spellingShingle |
Mohsan Jelani Zewen Li Zhonghua Shen Maryam Sardar Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys Applied Sciences Al-alloys CW laser tensile loading structural failure |
author_facet |
Mohsan Jelani Zewen Li Zhonghua Shen Maryam Sardar |
author_sort |
Mohsan Jelani |
title |
Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys |
title_short |
Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys |
title_full |
Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys |
title_fullStr |
Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys |
title_full_unstemmed |
Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys |
title_sort |
failure response of simultaneously pre-stressed and laser irradiated aluminum alloys |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2017-04-01 |
description |
The failure response of aluminum alloys (Al-6061 and Al-7075) under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found that the yield stress decreased with increasing laser power density. This implies that the load-bearing capacity of the specimens reduced under increased thermal or tensile loading. Consequently, the specimen’s failure time was shortened by increasing either laser power density or preloaded speed. For Al-6061, a remarkable reduction in failure time by the increase of laser power density is found. However, for Al-7075, under higher preloaded speeds, comparatively smaller impact of laser power density on the failure time is reported. Moreover, for Al-6061, relatively a more non-uniform variation in the average failure time with the increase of laser power density or preloaded speed is observed. The failure mode of Al-6061 turned from brittle to ductile at higher laser power densities; whereas for Al-7075, it changed from quasi-brittle to ductile. At higher preloaded speeds, a greater degree of melting and ablation phenomenon can be seen due to relatively higher temperatures and higher heating rates. |
topic |
Al-alloys CW laser tensile loading structural failure |
url |
http://www.mdpi.com/2076-3417/7/5/464 |
work_keys_str_mv |
AT mohsanjelani failureresponseofsimultaneouslyprestressedandlaserirradiatedaluminumalloys AT zewenli failureresponseofsimultaneouslyprestressedandlaserirradiatedaluminumalloys AT zhonghuashen failureresponseofsimultaneouslyprestressedandlaserirradiatedaluminumalloys AT maryamsardar failureresponseofsimultaneouslyprestressedandlaserirradiatedaluminumalloys |
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1716753216966754304 |