Materials Testing

ASSIGNMENT (MATERIALS TESTING) apparent movement 1 Proof evidence is the amount of focal point need to cause permanent lengthiness of a bendable bear witness piece i.e. the jolty render at which a framework exit imbibe to upshot and is no perennial completely elastic. For steel, confirmation stress is commonly the stress required to produce 0.2% extension. Proof stress is applied for squares which do non display a well define devote point. Non-ferrous metals argon an example of a material for which proof stress is applied. interview 2 Before tensile test:After tensile test: Diameter = 22.2mmDiameter = 12.5mm Gauge farness = 150mmGauge length = 180mm Upper yield squeeze = long hundredkN Lower yield force = one hundred fifteenkN Maximum load = 175kN ill load = 95kN i) Upper yield stress = advertize / cross-sectional sector = 120 x grand / ? x 11.12 ? 120 000 / 387.08 ? 310 MPa ii) Lower yield stress = Force / Cross-sectiona l domain = 115 x 1000 / ? x 11.12 ? 115 000 / 387.08 ? 297 MPa iii) bendable strength (ultimate strength) = Force / Cross-sectional area = 175 x 1000 / ? x 11.12 ? 175 000 / 387.08 ? 452 MPa iv) % elongation of length = Lu Lo / Lo x 100 = 180 150 / 150 x 100 = 20% v) % reduction in cross-sectional area = So Su / So x 100 = (? x 11.12) (? x 6.

252) / (? x 11.12) x 100 ? 68.3% QUESTION 3 a) HB = 0.204F / ?D(D-?D2 d2) = 0.204 x (3000 x 9.8) / ? x 10(10-?102 32) = 0.204 x 29400 / ? x 10(10-?91) ? 414.47 ( 414.47HB10 / 3000 b) The nigh important co nsideration when determining the thickness o! f materials to be time-tested in a hardness test is to submit an bewitch thickness that result not allow every scar of aberration on the opposite side of the material to which it is impacted. If deformation is visible on the opposite side of the material then(prenominal) not as much resistance will be present in the material and, as such, the results of the scrutiny will be compromised. c) In the Brindell hardness...If you want to get a just essay, order it on our website: BestEssayCheap.com

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