INVESTIGATION OF EFFECT OF MECHANICAL PROPERTIES OF DIFFERENT SHAPED NOTCHED AROUND THE SPECIMEN UNDER FRICTION STIR HOLE EXPANSION

The aim of the research work was to investigate on the effect of experimental testing on the test specimens for cast, cold hole expansion and stir hole expansion conditions. For as cast condition, the specimens with different Kt values were designed by referring to a data hand book. The specimens with different notch radii were then fabricated from a larger sheet of Aluminium 6061 by wire cutting method. The wire cut method was used as it gave a very accurate dimensional tolerance. A Universal Testing Machine (UTM) was used to perform tensile testing of the fabricated specimens. The notched specimens were subjected to tensile loading. Loading was applied incrementally to local strain measurements being made at each interval with the help of strain gauge, attached at the vicinity of the notch.