Explain Miner's Rule and discuss the limitation in applying Miner'sRule.An engine crankshaft is found to have the following fatigue lifecharacteristics: At operating stress of 420MPa, the number of cycles tofailure is 65 cycles. At operating stress of 360MPa, the number ofcycles to failure is 390 cycles, and at operating stress of 130MPa, thenumber of cycles to failure is 11,900 cycles.(i) Apply Miner's Rule, find the fraction of life exhausted under each ofthe stress level.Determine how many times the following sequence can be repeated.Operating stress of 420MPa for 7 cycles, operating stress of 360MPafor 65 cycles, and operating stress of 130MPa for 325 cycles.Find the endurance limit and fatigue life corresponding to the stressamplitude of 675MPa from the SN curve for ultra-high strength steelTM210A test data as shown in Figure Q3,795775#Material: TM210ASpecimen: SmoothTest condition: Kt=1,R=-1755735Fitting curveXBroken7150Run out695675655635615595106Number of cycles to failure, NFigure Q33. (a)(b)(c)Stress amplitude,MPa9755755551058xxX107

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

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.

Question

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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