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Rosario, Argentina

Mammana C.A.,National University of Costa Rica | Diaz F.V.,National University of Costa Rica | Guidobono A.P.M.,Centro Regional Rosario INTI | Bolmaro R.E.,CONICET
Research Journal of Applied Sciences, Engineering and Technology | Year: 2010

From data obtained using a method of indent pairs it was possible to analyse different residual stress states generated in high-speed milled specimens of AA 6082-T6 and AA 7075-T6 aluminium alloys. The present method integrates a special device of indentation into a universal measuring machine, allowing the introduction of elongated indents to significantly reduce the absolute error of measurement. Diverse protocols for operations of high-speed face milling allow us to compare residual stress tensors inherent to climb and conventional cutting zones. Through an exhaustive analysis of the Mohr's circles corresponding to those zones, a relationship was detected, which expresses the sensitivity of both alloys to develop surface residual stresses. © Maxwell Scientific Organization, 2010.

Diaz F.V.,National University of Costa Rica | Bolmaro R.E.,CONICET | Guidobono A.P.M.,Centro Regional Rosario INTI | Girini E.F.,Centro Regional Rosario INTI
Experimental Mechanics | Year: 2010

An improved method of indent pairs is utilised to determine residual stresses in high speed milling specimens of AA 6082-T6 and AA 7075-T6 aluminium alloys. To carry out the measurement procedure, this approach does not need specific equipment but only requires a universal measuring machine and an oven. An indentation device is incorporated to the measuring machine, which allows reducing the absolute error of measurement to just ±0.9 MPa. The geometry of the tool and cutting parameters are selected to evaluate the sensitivity of the method. The residual stress distributions generated by high speed milling are exhaustively evaluated taking into account orthogonal components of cutting speed and tangential force, which are parallel and perpendicular to feed direction. © Society for Experimental Mechanics 2009.

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