Engineering, 03.01.2020 05:31 livvyr0cks
Asteel rotating-beam test specimen has an ultimate strength of 120 kpsi. estimate the life of the specimen if it is tested at
a completely reversed stress amplitude of 70 kpsi.
Answers: 2
)= 120 Kpsi
)= 70 kpsi
= 0.5*120 = 60 kpsi
![a= 153.6 kpsiStep 4: calculate the coefficient 'b'[tex]b =-\frac{1}{3}log(\frac{f*S_{ut} }{S_{e}})](/tpl/images/0440/9906/4dd8b.png)
![b =-0.0680Step 5: calculate the life of the specimen[tex]N=(\frac{\alpha_{a}}{a})^\frac{1}{b}](/tpl/images/0440/9906/a2367.png)
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Asteel rotating-beam test specimen has an ultimate strength of 120 kpsi. estimate the life of the sp...
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