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

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
icon
Related questions
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
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
Expert Solution
steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Types of Properties of Engineering Materials
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY