Question

Assignment 01 TOT Mechanical Properties of Materials 1. A tensile test specimen has a gage length = 50 mm and its cross-sectional area = 100 mm. The specimen yields at 48,000 N, and the corresponding gage length - 50.23 mm. This is the 0.2 ent yield point. The maximum load of 87,000 N is reached at a gage length 64.2 mm. Determine (a) yield strength, (b) modulus of elasticity, and (c) tensile strength. (d) If fracture occurs at a gage length of 67.3 mm, determine the percent elongation. (e) If the specimen necked to an area = 53 mm, determine the percent reduction in area. 2. A tensile test specimen has a gage length - 2.0 in and diameter = 0.798 in. Yielding occurs at a load of 31,000 lb. The corresponding gage length = 2.0083 in, which is the 0.2 percent yield point. The maximum load of 58,000 lb is reached at a gage length - 2.47 in. Determine (a) yield strength, (b) modulus of elasticity, and (c) tensile strength. (d) If fracture occurs at a gage length of 2.62 in, determine the percent elongation. (e) If the specimen necked to an area 0.36 in determine the percent reduction in area. 3. A tensile test provides the following flow curve parameters: strain-hardening exponent 0.25 and strength coefficient - 500 MPa. Determine (a) flow stress at a true strain - 1.0 and (b) true strain at a flow stress = 500 MPa. 4. The following flow curve parameters were obtained for a metal alloy in a tensile test: strength coefficient = 550 MPa and strain-hardening exponent = 0.25. The same metal is now tested in a compression test in which the starting height of the specimen - 50 mm and its diameter - 30 mm. Assuming that the cross section increases uniformly, determine the load required to compress the specimen to a height of (a) 45 mm and (b) 35 mm. Templa....doc

Answer 1

solution of 1

P= ५४००० N JSomn ৭= 5০.93ma A = (০०n- Pma87000N = 2 ५৪००० ५8० mkq A l0 ६-50. 2-S)-০2-০০০৪ ১০ E= ১৯ ५৪० ০০০২ ।8५615, 38MP% Parar ৪7০M%। ४7००० ा तर |০० ६a 67.3-50 0-246134.6. So ০০ -53- 0.५1a |7: ) ০০ ७