A shaft is loaded in bending and torsion such that Ma = 70 N. m, Ta=45 N. m, Mm=55 N. m, and Tm = 35 N. m. For the shaft, Su = 700 MPa and Sy=560 MPa, and a fully corrected endurance limit of Se=210 MPa is assumed. Let Kf=2.2 and Kfs=1.8. With a design factor of 2.0 determine the minimum acceptable diameter of the shaft using the

(a) DE-Gerber criterion.
(b) DE-ASME Elliptic criterion.
(C) DE-Soderberg criterion.
(d) DE-Goodman criterion.

Discuss and compare the results.

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.