Fatigue And Heat Transfer Behaviour Of Shot Peened Aluminum Alloy For Automobile Applications

Author:  V.S Nadkarni and M.C. Sharma
Source:  Conf Proc: ICSP & BC - 2
Doc ID:  2001163
Year of Publication:  2001
Abstract:  
In the present investigation glass beads and zirconium oxide shots were used as media, to shot peen alluminium alloy specimens. Fatigue and boiling heat transfer behaviour of this alloy after . shot peening was studied. Out of 0.2N and 0.4N peening intensities, 0.4N gave higher improvement on fatigue strength and boiling heat transfer. Fatigue of butt welded aluminium joints were also studied. Shot peening with zirconium oxide shots at 0.4N intensity was found to be more advantageous than glass beads. Welding reduces 19.4% fatigue strength compared to virgin samples. Effect of corrosive (3N Nacl) environment on fatigue strength was alos studied. Zir shots were found to be economical. The commercial application of shot peening in automobiles to enhance boiling heat transfer was also studied. The heat transfer media then used was the coolant commonly used in Car radiators. That was 95% ethylene glycol with some inhibitor to prevent corrosion. This was a mixture of water and glycol in 3:l ratio. The optimum surface roughness was 6.2 pm which gave optimum heat transfer at 90% improvement in boiling heat transfer compared to unpeened samples.