Exercise 3: TEK3011 A structure is subjected to the stress history given in the Table below. Block Omar (MPa) Omn (MPa)

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Exercise 3 Tek3011 A Structure Is Subjected To The Stress History Given In The Table Below Block Omar Mpa Omn Mpa 1 (47.88 KiB) Viewed 23 times

Exercise 3: TEK3011 A structure is subjected to the stress history given in the Table below. Block Omar (MPa) Omn (MPa) A 100 B 250 *800 cycles / day Cycles (days) 312 0 0 a) Using the Manson-Halford equation determine the fatigue life (in months of the structure after blocks A and B are applied. Manson-Halford equation: n2 =1 Basquin Equation: N = C, with C=360 MPa and a=0.11. Goodman Equation: p=400 MPa of 08 b) The fatigue life is defined as the formation of a semi-circular surface crack with depth equal to 2mm. Calculate the number of cycles to catastrophic failure using Paris law. Paris law: da = CAK dN The constants are C = 6.8 10-12 and m-3.2 The toughness of the material is 50 MPa ms. Assume that the correction factor, F, is constant and equal to 0.663. The stress intensity is: K = O VIAF