Analysis of residual strain and stress distributions in high speed milled specimens using an indentation method

F.V. DÍAZ; C.A. MAMMANA; A.P.M. GUIDOBONO ; R.E. BOLMARO

International Journal of Engineering and Applied Sciences

World Academy of Science, Engineering and Technology

Año: 2011 vol. 7 p. 40 - 46

2010�3980

Through a proper analysis of residual strain and stress distributions obtained at the surface of high speed milled specimens of AA 6082-T6 aluminium alloy, the performance of an improved indentation method is evaluated. This method integrates a special device of indentation to a universal measuring machine. The mentioned device allows introducing elongated indents that make possible to diminish the absolute error of measurement. It must be noted that the present method offers the great advantage of avoiding both the specific equipment and highly qualified personnel, and their inherent high costs. In this work, the cutting tool geometry and high speed parameters are selected to introduce reduced plastic damage. Through the variation of the depth of cut, the stability of the shapes adopted by the residual strain and stress distributions is evaluated. The obtained results show that the introduced strains and stresses are compressive and very low, and besides, the shapes of the distributions remain unchanged. Moreover, the distributions reveal a similar asymmetry grade when the gradients corresponding to conventional and climb cutting zones are compared.