Find the “Idealized" R. R. Moore Rotating Bending Endurance Limit S₁' and the 103 - Cycle Fatigue Strength (S₁0³) for steel specimens having Brinell Hardness Numbers (Bhn) of 150, 375, and 550. Ans. (Bhn=150) S₁' = 37.5 ksi S103 = 67.5 ksi (Bhn = 375) Sn' = 93.75 ksi S10³ = 168.75 ksi (Bhn = 550) S₁' = 100 ksi S103 = 247.5 ksi

1) Estimate the 10³-cycle fatigue strength for rotating bending and also the bending endurance limit for R. R. Moore test specimens made of 1040, 4140, and 9255 steels having ultimate tensile strengths of 100, 160, and 280 ksi, respectively. Plot the S-N curves on log-log coordinates.

A 4340 quench and tempered rotating steel shaft, d = 1 in, is loaded in fully reversed bending . The bar has been machined with surface conditions a = 1.34 ksi and b = -0.085, and will be operating at room temperature. The program requires a reliability of 99.99 percent. The fillet radii at all points is r = 0.08 in. The fatigue strength fraction f = 0.76, and the The ultimate strength (Sut) is 260 Ksi. Determine the endurance limit in the aforementioned conditions

A flat-rolling operation of 250 mm wide alloy stee Calculate roll torque

Estimate the endurance strength (Se) of a 1.49-in-diameter (d) rod of AISI 1040 steel having a machined finish and heat-treated to a tensile strength ( Su) of 108 kpsi, loaded in rotating bending. Obtain the parameters for Marin surface modification factor from Table 6-2. The endurance strength is kpsi

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Please provide full detailed solution and explaination for this problem. Table A-20 is provided. Please hurry

Problem 2: Determine the Factor of Safety for the following condition: (a) Using distortion-energy theory, determine the factor of safety of a AISI 1040 hot-rolled steel for the following plane stress states: o = -50 MPa, o, = 40 MPa, Ty=-80 MPa (b) Using Coulomb-Mohr and Modified mohr theory, determine the factor of safety of a ASTM 50 cast iron for the following principal stress states: o, = 10 kpsi, o, = -15 kpsi, ty= -20 kpsi

: Brinell Hardness and Ultimate Tensile Stress A steel member has a Brinell of H = 275. Estimate the ultimate strength of the steel in MPa. A gray cast iron part has a Brinell hardness number of H₂= 200. Estimate the ultimate strength of the part in kpsi. Make a reasonable assessment of the likely grade of cast iron by comparing both hardness and strength to material options in Table A-24. A part made from 1040 hot-rolled steel is to be heat treated to increase its strength to approx- imately 100 kpsi. What Brinell hardness number should be expected from the heat-treated part?

1. A rotating l-in diameter solid round bar has a groove 0.1-in deep with a 0.1-radius machined into it. The bar is made of AISI 1020 CD steel and is subjected to a purely reversing torque of 1800 lbf-in. For the S-N curve of the material, let f= 0.9. 1) Estimate the number of cycles to failure. 2) If the bar is also placed in an environment with a temperature of 750 °F, estimate the number of cycles to failure. Note: for pure shear stress state, find ta and Tm to replace oa and om. Apply the load factor k. = 0.59. To get safety factor against first-cycle yielding, use Sgy=0.577 Sy (based on DE theory). For fatigue life or fatigue failure criteria, Replace Sut with Sgu. Ssu = 0.67Sµt