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Lecture 15 Fatigue Mechanical Behavior of Materials Sec. 11.1-11.3 Jiangyu Li

Mechanics of Materials Lab. Lecture 15 Fatigue Mechanical Behavior of Materials Sec. 11.1-11.3 Jiangyu Li University of Washington. S-N Diagram. Safety Factor. Example.

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Lecture 15 Fatigue Mechanical Behavior of Materials Sec. 11.1-11.3 Jiangyu Li

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  1. Mechanics of Materials Lab Lecture 15 Fatigue Mechanical Behavior of Materials Sec. 11.1-11.3 Jiangyu Li University of Washington Jiangyu Li, University of Washington

  2. S-N Diagram Jiangyu Li, University of Washington

  3. Safety Factor Jiangyu Li, University of Washington

  4. Example 9.10 For AISI 4340 steel in Table 9.1, a life of 1.94x105 cycles to failure is calculated for the stress amplitude of sa=500 Mpa. Suggestion is made that parts of this type be replaced when the number of cycles applied reach 1/3 of the life. • What is the safety factors in life and in stress • Is the suggestion good? Jiangyu Li, University of Washington

  5. Facture Mechanics Method of Fatigue Jiangyu Li, University of Washington

  6. Crack Growth > > Jiangyu Li, University of Washington

  7. Fatigue Life Jiangyu Li, University of Washington

  8. Fatigue Crack Growth Rate Jiangyu Li, University of Washington

  9. Crack Grow Rate Jiangyu Li, University of Washington

  10. Crack Growth Rate Jiangyu Li, University of Washington

  11. Effect of R Ratio Jiangyu Li, University of Washington

  12. Example • For a bar subjected to 0<M<1200lb · in, Sut=185kpsi, Sy=170kpsi, Kic=74kpsi·in1/2, C=3.8 10-11 (in/cycle)/(kpsi·in1/2)m, m=3.0, a=0.004in. Estimate Nf. Jiangyu Li, University of Washington

  13. Example Initial estimate, F=1 Jiangyu Li, University of Washington

  14. Assignment Mechanical Behavior of Materials 11.3, 11.7 Jiangyu Li, University of Washington

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