1_ch 20 Mechanical Design budynas_SM_ch20

1_ch 20 Mechanical Design budynas_SM_ch20 -...

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(b) f / ( N x ) = f / (69 · 10) = f / 690 Eq. (20-9) ¯ x = 8480 69 = 122 . 9 kcycles Eq. (20-10) s x = 1 104 600 8480 2 / 69 69 1 1 / 2 = 30.3 kcycles Ans. x f f x f x 2 f / ( N x ) 60 2 120 7200 0.0029 70 1 70 4900 0.0015 80 3 240 19 200 0.0043 90 5 450 40 500 0.0072 100 8 800 80 000 0.0116 110 12 1320 145 200 0.0174 120 6 720 86 400 0.0087 130 10 1300 169 000 0.0145 140 8 1120 156 800 0.0116 150 5 750 112 500 0.0174 160 2 320 51 200
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