Question

Consider the metal specimen with KIC =64 MPa-sqrt(m); edge crack measures 15.398 mm; Y = 1.05; Paris’ m = 3.1 and Paris’ A = 3.2E-12 meters / (cycle-MPa-sqrt(m)) ^3.1). Use Excel and Goal Seek to estimate the cyclic tensile stress amplitude that results in fatigue life of 0.534E6 cycles.

Answer 1

Solution Given that consider the meral specimen described in problem, KIC sumpa - sart (m) 160MPa. 9, - 15.398 mm 1.05 = 3.2 x 10-18 m/leycle mpa Tm) 3. m 3.1 en Derev mine me critical crank length, (a = af) = you hac KIC 64 105 x 160 xtrae Tac 64 168 10.38095 Tac (0.3enas) ac (0.38095 g 2 00461 946 acco.046194 m Now paris law 1 / 2 - 1 Nf AY DOUT) 3.1 -1 (0. 01539)4-1 3.1 5.432 3.2x10-12 (105 x 160 x ) (0.0461) 3; 2 x 10-12 (297.77)39 .[1.316)(2.431 = 6695.8998 x [(1.918)[4.4995 ]] 54773.0697. Nf: 5.4773 x103 Cycles

P.S: If you are having any doubt, please comment here, I will surely reply you.Please provide your valuable feedback by a thumbsup. Your thumbsup is a result of our efforts. Thanks in advance!