Transcription of MECHANICAL TESTS - Rodacciai
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MECHANICAL TESTS - Rodacciai
TESTM agnitudeSymbolMeasurement unitDescriptionTensile strengthRmMPa (N/mm2)it is the ratio between the maximum applied force and the original cross-sectional area of the specimenUpper yield strengthRsMPa (N/mm2)it is detectable only when the material has the yield phenomenon (it doesn t exist for the cold drawn and the stainless steels)Yield pointRpMPa (N/mm2)it is detectable on cold drawn and stainless steel, in place of R5Rp(0,2)MPa (N/mm2)load corresponding to a no proportional charge equal to a 0,2% of length L0Rp(1,0)MPa (N/mm2)load corresponding to a no proportional charge equal to a 1% of length L0 ElongationA%permanent elongation of length L0, expressed in per cent of length L0A5%permanent elongation for proportional specimens with length L0 equal to 5 times diameterA4%permanent elongation for proportional specimens with length L0 equal to 4 times diameterA0%permanent elongation for proportional specimens with length L0 equal to 100 mm (used for diameter lower than 4mm)Reduction areaZ%Ratio between the maximum variation of area of transverse section and area of initial section S0, expressed in per centThis test measuresthe load, applied by MECHANICAL or hydraulic test equipment, necessary to rapture a specimen.
wwwodacciaico COMPARISON AMONG HARDNESS VALUES OBTAINED FROM DIFFERENT SYSTEM Among the different hardness scales it is possible to establish only a rough and empirical comparison, except for a connection between Brinell and Vickers hardness.
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