Question

A cold drawn rectangular steel bar with a ultimate tensile strength of Su = 482 MPa and dimension as shown below. Estimate the maximum completely alternating tensile force (HF) that can be applied to the ends and have an infinite fatigue life with a safety factor of 1.3. 140 Bhn h = 10 mm b = 60 mm d = 12 mm

Answer 1

Given data: ultimate tensile strength = Su = 482 mpa facter of safety = fos = 1.3 sut Menuinem tensile stress - Gman = For • 482 Eman = 482 mare a 1-3 Eman = 370.769 mpa h = 10mm b= 60 mm d = 12 mm - kt = 1+2 ) Theoretical stoess concentration per circle, Kt = 3 ¢ Resisting Area, FA = ( b-d) h. A = 660-12)X10 A = 480 mm ¢

mene Zmg = 2, 3 . A 370.769 = 3* Froese 480 Fmax = 59323.04 N Fmone = 59.323 KN ;. Mamimum tensile Perce is 59,323 lery