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

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

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

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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

Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

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

Jiangyu Li, University of Washington

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Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

- 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

Initial estimate, F=1

Jiangyu Li, University of Washington

Mechanical Behavior of Materials

11.3, 11.7

Jiangyu Li, University of Washington