DETERMINATION OF RESIDUAL STRESS DISTRIBUTION IN HIGH STRENGTH ALUMINUM ALLOY AFTER EDM
Shahid Mehmood 1  
,  
Amir Sultan 2  
,  
Nazeer Ahmad Anjum 1  
,  
Waqas Anwar 3  
,  
Zubair Butt 2  
 
 
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1
University of Engineering and Technology Taxila, Mechanical Engineering Department, 47080 Taxila, Pakistan
2
University of Engineering and Technology Taxila, Mechatronics Engineering Department, Chakwal Campus, 48800 Chakwal, Pakistan
3
Institute of Space Technology, Engineering Research and Development Sector, 44000 Islamabad, Pakistan
CORRESPONDING AUTHOR
Zubair Butt   

University of Engineering and Technology Taxila, Mechatronics Engineering Department, Chakwal Campus, 48800 Chakwal, Pakistan
Publish date: 2017-03-01
 
Adv. Sci. Technol. Res. J. 2017; 11(1):29–35
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ABSTRACT
Thermal energy produced by discrete and random electric sparks in electric discharge machining (EDM) melts surface material. A portion of this molten material is removed and the remaining material resolidified by rapid cooling in a hydrocarbon oil. The effect of repeated heating and cooling of the surface and sub surface material with complex temperature gradient results residual stresses in machined part. The aim of this investigation is to determine the distribution of residual stresses in the depth of machined material with respect to discharge current, most important electric parameter during EDM. It is well known that surface finish is dependent on discharge current. Therefore, investigations were carried out for smaller discharge current levels i.e. 3, 6, 9, 12 ampere. Hole-drill strain gauge method is used for the determination of residual stresses in the depth of material. For comparison purpose, residual stresses are also determined for conventionally turned specimens. This study provided quantitative analysis of the residual stresses for various discharge current in EDM which is a key parameter in deciding the service life of material.