Calculate the final critical surface crack length if the fatigue life of a material with a Kic of 25 Mpa m1/2 must be a minimum of 6.6 x 105 cycles. Assume the initial maximum edge surface crack to be 1.1 mm and the maximum tensile stress of 137MPa. Assume m=1.3, and A = 7.5x10-13 and Y = 1.19. The answer should be in mm with 2 decimals of accuracy.

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k