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

A full forming P= 53 kN axial force acts on the part shaped by the machining method made of xCy steel material. The thickness of the part is t= 20 mm and the steel tensile strength is sigma(tensile) = 630 MPa . Calculate the individual fatigue life of the A and B sections of the machine part for 90% reliability. Draw logarithmic S_N diagrams.

A full forming P= 59 kN axial force acts on the part shaped by the machining method made of xCy steel material. The thickness of the part is t= 20 mm and the steel tensile strength is sigma(tensile) = 690 MPa . Calculate the individual fatigue life of the A and B sections of the machine part for 90% reliability. Draw logarithmic S_N diagrams.

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A full forming P= 57 kN axial force acts on the part shaped by the machining method made of xCy steel material. The thickness of the part is t= 20 mm and the steel tensile strength is sigma(tensile) = 670 MPa . Calculate the individual fatigue life of the A and B sections of the machine part for 99% reliability. Draw logarithmic S_N diagrams.

1. An AISI 1018 steel has a yield strength, Sy = 295 MPa. Using the distortion energy theory for the plane stress state ox = -30 MPs, Oy = -65 MPa, and Txy = 40 MPa. 1) Determine the factor of safety. 2) Plot the safety envelope of the material. 3) Plot the load line. 4) Estimate the factor of safety by graphical method (refer to 4-1 Ductile Failure I, P10).

Calculate Brinell Hardness for Hardened AW-6060 Aluminium if mean depression diameters (d)= 5.64mm with applied load of * ?3000kgf

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.

An ASTM cast iron, grade 30, has ultimate strength at tension Sut = 350 MPa, and at compression Sục %3D = 1150 MPa. it carries static loading resulting in the stress state listed below at the critical locations. Using the static failure analysis estimate the factor of safety. OA = 162 MPa, oB = -212 MPa. %3D

A structural support for a machine is subjected to a static compression load of 20 kN. The support is manufactured from a circular rod made from SAE 1040 Hot Rolled steel. Specify suitable diameter for the cross section of the rod based on the basic size. Steel data are available in Table A-10 from the textbook. A-10 Typical propertics of carbon and alloy steels. Ultimate strengih, s. Yield strength, Percent Material SAE no. Condition ksi MPa: ksi MP clongation Anncaled Hot rolled Cold drawn 57 65 75 393 448 517 43 48 64 296 331 441 36 36 20 1020 1020 1020 1040 Annealed 75 $17 352 30 Hot 1010 565 641 621 s52 16 Cold drawn WQT 700 WQT 900 WQT 1100 WQT 1300 1040 876 814. 19 22 127. 1040 1040 1040 1040 107 87 600 63 434 32 1080 1080 1080 1080 Annealed OQT 700. OQT 900 OQT 100 OQT 1300 89 189 179 145 117 614 1303 1234 1000 807 54 141 129 372 972 889 P10 13 17 103 70 483 1080 352 655 T186 中6 14 Annealed Cold drawn OQT 700 OQT 900 OOT 1100 OQT 1300 87 112 193 146 116 94 600 772 1331 1007 800…