The beam is designed to carry a fluctuating stress from a load of 1,200-lb. The beam is made of Cold-Drawn AISI 1040 steel (wrought steel). Using the Goodman Method for Fatigue of Ductile materials, determine the design factor, N. 10 in 1200 lb 10 in 2-in dia

5. A brittle steel bar has the dimensions shown. Determine the maximum axial force P that can be applied not to exceed the allowable tensile stress of allow= 100 MPa. (Make sure to determine and account for the stress concentration factors). K 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0 P 0.1 0.2 0.3 W h W h 30 mm - 4.0 = 3.0 W Jang W h W h II = || 24 mm it P ht 2.0- = 1.5. T AL W W 12 mm 1.2- - 0.4 0.5 0.6 0.7 0.8 0.9 r 1.0 K 60 mm 3.2 3.0 2.8 2.6 2.4 2.2 2.0 0 0.1 r = 15 mm P 0.2 2r avg 0.3 2r P (w – 2r)t 0.4 0.5

Parvinbhai

A simply supported reinforced concrete beam carries a uniformly distributed load of 12 kN/m on a span of 4 m. The beam has a rectangular cross section 250 mm wide by 450 mm deep, with three 20 mm diameter steel bars placed 60 mm from the bottom of the beam, as shown below. The moduli of elasticity for the concrete and steel are 15 GPa and 200 GPa, respectively. Determine the average tensile stress in the steel and the maximum compressive stress in the concrete at the section of maximum bending moment. 450 mm 250 mm 60 mm