Materials report.docx - Introduction There is various type...

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IntroductionThere is various type of steels and each individual mechanical nature and property differs,this generalisation could be determined by the different values of its Yield stress, ElasticModulus (Young’s modulus), Ultimate strength and its Ductility. This report will mainlyconcentrate on the mechanical aspect of different type of steels and how strain hardeningand deformation rate could also alter the mechanical properties of steels.To understand the concept of the steels, a scientific experiment was conducted by having atensile test on five different type/methodology of steel coupons. The objectives of thisexperiment were to obtain the information and analyse different behaviour of the steelswhen under tensile stress and the result will be expressed through a stress strain curve.MethodThe dimensions of the tested coupons were all assumed to be identical with thespecification of, the Cross-section area is 1.9mm x 2mm; the initial cross head is 200mm; theinitial gauge length is 50mm and the length of the extensometer is 25mm.Each coupon will be tested using tensile strength with the testing machine until fractureoccurred. The coupons were initially placed vertically with both ends of the coupons wereclamped to avoid slippage during the stretching. The tensile load will increase accordingly asthe extensometer measures the value of elongation, thus resulting the data of the Force (N)vs Elongation (mm).There were five different tests held on the experiment, three coupons were made from mildsteel and the other two were stainless steel and high strength steel. The details of each fivetest were to follow:Test 1: reference mild steel coupon – the coupon will be loaded to fractureTest 2: study of strain hardening effect in mild steel coupon – the test will beperformed with 10% of elongation. The specimen will then repeat theprevious experiment until the coupon fractureTest 3: study of deformation rate effect in mild steel coupon – using the samematerial as the reference coupon however, it has three times the referencestrain rateTest 4: stainless steel – loaded to fractureTest 5: high strength steel – loaded to fracture-ResultsThe results were obtained and were calculated to obtainStress(N/mm2): Load applied(N)/Cross section area (mm2) andStrain(mm): Elongation of the coupon (mm)/Originallength of the extensometer (mm).

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Term
Three
Professor
GwenaelleProust
Tags
Tensile strength, ultimate strength, High strength steel

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