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Explain Miner's Rule and discuss the limitation in applying Miner's Rule.

Explain Miner's Rule and discuss the limitation in applying Miner's Rule.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Explain Miner's Rule and discuss the limitation in applying Miner's Rule. An engine crankshaft is found to have the following fatigue life characteristics: At operating stress of 420MPa, the number of cycles to failure is 65 cycles. At operating stress of 360MPa, the number of cycles to failure is 390 cycles, and at operating stress of 130MPa, the number of cycles to failure is 11,900 cycles. (i) Apply Miner's Rule, find the fraction of life exhausted under each of the stress level. Determine how many times the following sequence can be repeated. Operating stress of 420MPa for 7 cycles, operating stress of 360MPa for 65 cycles, and operating stress of 130MPa for 325 cycles. Find the endurance limit and fatigue life corresponding to the stress amplitude of 675MPa from the SN curve for ultra-high strength steel TM210A test data as shown in Figure Q3, 795 775 # Material: TM210A Specimen: Smooth Test condition: Kt=1,R=-1 755 735 Fitting curve X Broken 715 0 Run out 695 675 655 635 615 595 106 Number of cycles to failure, N Figure Q3 3. (a) (b) (c) Stress amplitude,MPa 975 575 555 105 8 xx X 107
Transcribed Image Text:Explain Miner's Rule and discuss the limitation in applying Miner's Rule. An engine crankshaft is found to have the following fatigue life characteristics: At operating stress of 420MPa, the number of cycles to failure is 65 cycles. At operating stress of 360MPa, the number of cycles to failure is 390 cycles, and at operating stress of 130MPa, the number of cycles to failure is 11,900 cycles. (i) Apply Miner's Rule, find the fraction of life exhausted under each of the stress level. Determine how many times the following sequence can be repeated. Operating stress of 420MPa for 7 cycles, operating stress of 360MPa for 65 cycles, and operating stress of 130MPa for 325 cycles. Find the endurance limit and fatigue life corresponding to the stress amplitude of 675MPa from the SN curve for ultra-high strength steel TM210A test data as shown in Figure Q3, 795 775 # Material: TM210A Specimen: Smooth Test condition: Kt=1,R=-1 755 735 Fitting curve X Broken 715 0 Run out 695 675 655 635 615 595 106 Number of cycles to failure, N Figure Q3 3. (a) (b) (c) Stress amplitude,MPa 975 575 555 105 8 xx X 107
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