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7.16 Started: Mar 13 at 11:30pm Quiz Instructions Question 1 1 pts Alarge flat plate is subjected to constant-amplitude uniaxial cyclic tensile stresses of a maximum stress of 102 and a minimum stress of 24 MPa. If before testing the largest surface crack is 0.61 mm and the plain-strain fracture toughness of the plate is 31.6 MPa m1/2 estimate the fatigue life of the plate in cycles to failure. For the plate, m - 4.2 and A = 5.0 x 10-12 in MPa and meter units. Assume Y = 1.7

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Answer 1

or hown data , = lo? mp4 Im = pumpa KIC = 31.6 m Panh m = 4.2 A= SX10 12 inmpa Y=17 amat = 1.0105mm = 92 Now (31.6x1067 1.7.(1023)')?. A de. Alok)". S x 15"cor tot - Sxlöt? (you shaman & 12 an -2)/2) - 2 ((a,m) - 9 if - = par da Jo, A (Akim m.2 A (Ao Say)" (61) 142 - -(42-2) (0105) 2 - (4:2-3) sxlox 18gh2 hotely 1,7422 - 1.72 - 150 909x - " No Sx10th x S40 21x1 x 102408 x 9, 287 9.62 x 10² cycle) som