a) A bar of normalized AISI 4130 is subjected to a steady torsional stress of 103 MPa, an alternating torsional stress of 69 MPa, and alternating bending stress of 83 MPa. It has an endurance limit of 276 MPa. Using Gerber and ASME-elliptic criteria, find the safety factors guarding against a fatigue failure and the expected life of the part. Analyse your results. b) A bar of 25 mm diameter cold-drawn SAE 1045 steel is loaded in rotating bending. Determine its endurance limit or strength.

The total load for a canopy overhang is 105,340# and the load is equally distributed to five steel rod ties. The sample steel rod tested has tensile strength of 20,000psi. A selection of steel rods (same material as the tested sample) is available in different sizes shown below. Select the rod size that best fits this application? (SA = Surface Area) (f= P/A) (LO4) O 1" (SA= 0.79 sq in) 3/4" (SA=0.44 sq in) O½" (SA= 0.20 sq in) O 1¼" (SA= 1.22 sq in) O 1½ (SA= 1.76 sq in)

A tensile-testing apparatus is to be constructed that must withstand a maximum load of 293516 N. The design calls for two cylindrical support posts, each of which is to support half of the maximum load. Furthermore, plain-carbon(1045) steel ground and polished shafting rounds are to be used; the minimum yield and tensile strengths of this alloy are 343 MPa and 565 MPa(82,000 psi), respectively. Specify a suitable diameter in mm for these support posts. Assume safety level is 2.3. Round your answer to 2 significant figures.

MECH.ENG. DESIGN 1 PART 2

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Required information Given a bar made of brittle material, properties of Sut= 30 kpsi and Suc = 90 kpsi and with stresses of Ox= -15 kpsi, Oy= 10 kpsi, and Txy=-15 kpsi. For the given state of plane stress, determine the factor of safety using the Coulomb-Mohr theory. The factor of safety is

Tensile and fully reversed loading fatigue tests were conducted for a certain steelalloy and revealed the tensile strength and endurance limit to be 1200 and 550 MPa,respectively. If a rod of this material supply were subjected to a static stress of 600MPa and fully-reversed oscillating stresses whose total range was 700 MPa. Assuming garber relationship will this rod fail by fatigue failure