A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Improvement in fatigue performance of friction stir welded A6061-T6 aluminum alloy by laser peening without coating
Highlights ► Effect of laser peening without coating on friction stir welded A6061-T6 joint. ► Compressive residual stress was imparted on the joint. ► Hardness on the stir zone was recovered in some degree. ► Fatigue strength was improved from 90 to 120MPa at 107 cycles. ► This strength was higher than that of unwelded base material.
Abstract The authors have applied laser peening without coating (LPwC) to fatigue specimens cut out from friction stir welded (FSWed) A6061-T6 aluminum alloy plates with a thickness of 3mm. Both crown and root sides of the specimens were peened by laser pulses with an energy of 60mJ and a peak power density of 2GW/cm2 from a frequency-doubled Nd:YAG laser. The effects on the fatigue properties were studied through plane bending fatigue tests with a stress ratio of R =−1. The results showed that the fatigue strength of unwelded specimens (base material; BM) was 110MPa at 107 cycles and LPwC enhanced the strength by 60MPa in spite of increase in surface roughness due to the direct irradiation of the laser pulses to the bare surface of the specimens. Meanwhile the fatigue strength of FSWed specimens was 90MPa and LPwC enhanced it by 30MPa to 120MPa. This increment is a half compared to that in the BM, however the fatigue strength of the FSWed specimens after LPwC was higher than that of the BM. The surface roughness, hardness and residual stress were assessed and characterized as well.
Improvement in fatigue performance of friction stir welded A6061-T6 aluminum alloy by laser peening without coating
Highlights ► Effect of laser peening without coating on friction stir welded A6061-T6 joint. ► Compressive residual stress was imparted on the joint. ► Hardness on the stir zone was recovered in some degree. ► Fatigue strength was improved from 90 to 120MPa at 107 cycles. ► This strength was higher than that of unwelded base material.
Abstract The authors have applied laser peening without coating (LPwC) to fatigue specimens cut out from friction stir welded (FSWed) A6061-T6 aluminum alloy plates with a thickness of 3mm. Both crown and root sides of the specimens were peened by laser pulses with an energy of 60mJ and a peak power density of 2GW/cm2 from a frequency-doubled Nd:YAG laser. The effects on the fatigue properties were studied through plane bending fatigue tests with a stress ratio of R =−1. The results showed that the fatigue strength of unwelded specimens (base material; BM) was 110MPa at 107 cycles and LPwC enhanced the strength by 60MPa in spite of increase in surface roughness due to the direct irradiation of the laser pulses to the bare surface of the specimens. Meanwhile the fatigue strength of FSWed specimens was 90MPa and LPwC enhanced it by 30MPa to 120MPa. This increment is a half compared to that in the BM, however the fatigue strength of the FSWed specimens after LPwC was higher than that of the BM. The surface roughness, hardness and residual stress were assessed and characterized as well.
Improvement in fatigue performance of friction stir welded A6061-T6 aluminum alloy by laser peening without coating
Sano, Y. (author) / Masaki, K. (author) / Gushi, T. (author) / Sano, T. (author)
2011-10-28
6 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2012
| British Library Online Contents | 2007
| British Library Online Contents | 2007
Fatigue Strength of Friction Stir Welded Aluminum Alloy Joints
| British Library Online Contents | 2007
Effects of peening on mechanical properties in friction stir welded 2195 aluminum alloy joints
| British Library Online Contents | 2008