23_ch 20 Mechanical Design budynas_SM_ch20

23_ch 20 Mechanical Design budynas_SM_ch20 - / . 90)] 1 / 2...

This preview shows page 1. Sign up to view the full content.

Chapter 20 23 n (kcycles) f W ( n ) f LN ( n ) 40 9.1E-05 1.82E-05 50 0.000991 0.000241 60 0.002498 0.001233 70 0.004380 0.003501 80 0.006401 0.006739 90 0.008301 0.009913 100 0.009822 0.012022 110 0.010750 0.012644 120 0.010965 0.011947 130 0.010459 0.010399 140 0.009346 0.008492 150 0.007827 0.006597 160 0.006139 0.004926 170 0.004507 0.003564 180 0.003092 0.002515 190 0.001979 0.001739 200 0.001180 0.001184 210 0.000654 0.000795 220 0.000336 0.000529 The Weibull L10 life comes from Eq. (20-26) with a reliability of R = 0 . 90 . Thus, n 0 . 10 = 36 . 9 + (133 36 . 9)[ln(1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: / . 90)] 1 / 2 . 66 = 78 . 1 kcycles Ans. The lognormal L10 life comes from the deﬁnition of the z variable. That is, ln n = µ y + ˆ σ y z or n = exp( µ y + ˆ σ y z ) From Table A-10, for R = . 90, z = − 1 . 282 . Thus, n = exp[4 . 771 + . 2778( − 1 . 282)] = 82 . 7 kcycles Ans. f ( n ) n , kcycles 0.004 0.002 0.006 0.008 0.010 0.012 0.014 100 50 150 200 LN W 250...
View Full Document

This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.

Ask a homework question - tutors are online