For Questions consider the S-N curve provided below for this same material and situation. Stress &...

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For Questions consider the S-N curve provided below for this same material and situation. Stress & (MPa) 400 300 B. 175 MPa C. 200 MPa 200 100 10⁰ C. 350 MPa D. 400 MPa E. It will never fail P-0.99 -P=0.90 P=0.01- P = 0.10 105 -P-0.50 10° 10 Cycles to failure, N logarithimic scale) 111 D. 225 MPa E. There is no clear fatigue limit. 108 !!! !!! 111 T L ULT 109 The fatigue limit exhibited by the material represented in the S-N curve is A. 150 MPa 70 60 50 40 30 ! Estimate the number of cycles to failure (fatigue life) before which 50% of similar samples tested will fail when subjected to 300 MPa cyclic tensile stress. A. 1.5x10 B. 1.75x10+ C. 1.0x10³ D. 1.0x106 E. It cannot be determined with only the information provided. 20 Estimate the maximum applied tensile stress at which 10% of similar samples tested will fail before 1x106 cycles are achieved. A. 250 MPa B. 300 MPa 10 Stress (10 psi) The fatigue life of a material subjected to cyclic loads is very accurately predicted for all materials using the Paris law formulation as long as the correct material constants are used. A. True B. False For Questions consider the S-N curve provided below for this same material and situation. Stress & (MPa) 400 300 B. 175 MPa C. 200 MPa 200 100 10⁰ C. 350 MPa D. 400 MPa E. It will never fail P-0.99 -P=0.90 P=0.01- P = 0.10 105 -P-0.50 10° 10 Cycles to failure, N logarithimic scale) 111 D. 225 MPa E. There is no clear fatigue limit. 108 !!! !!! 111 T L ULT 109 The fatigue limit exhibited by the material represented in the S-N curve is A. 150 MPa 70 60 50 40 30 ! Estimate the number of cycles to failure (fatigue life) before which 50% of similar samples tested will fail when subjected to 300 MPa cyclic tensile stress. A. 1.5x10 B. 1.75x10+ C. 1.0x10³ D. 1.0x106 E. It cannot be determined with only the information provided. 20 Estimate the maximum applied tensile stress at which 10% of similar samples tested will fail before 1x106 cycles are achieved. A. 250 MPa B. 300 MPa 10 Stress (10 psi) The fatigue life of a material subjected to cyclic loads is very accurately predicted for all materials using the Paris law formulation as long as the correct material constants are used. A. True B. False

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