Q1. State whether each of the two statements included in your input values for Q1 are true or false: A. Sufficiently high tensile stress is required for fatigue crack propagation B. Sufficiently high compressive stress is required for fatigue crack propagation C. Fatigue requires sufficient variation in stress magnitude D. Fatigue requires no variation in stress magnitude E. A sufficient number of cycles is required to cause fatigue failure F. A single cycle of loading below the ultimate tensile strength is sufficient for fatigue failure G. Endurance limit implies finite life H. Fatigue limit implies finite life 1. Fatigue limit implies infinite life J. Endurance limit implies infinite life

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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   at question        A=110 MPa       B=-60 MPa            M=145 N.m                                                                                    

Q1. State whether each of the two statements included in your input values for Q1
are true or false:
A. Sufficiently high tensile stress is required for fatigue crack propagation
B. Sufficiently high compressive stress is required for fatigue crack propagation
C. Fatigue requires sufficient variation in stress magnitude
D. Fatigue requires no variation in stress magnitude
E. A sufficient number of cycles is required to cause fatigue failure
F. A single cycle of loading below the ultimate tensile strength is sufficient for
fatigue failure
G. Endurance limit implies finite life
H. Fatigue limit implies finite life
I. Fatigue limit implies infinite life
J. Endurance limit implies infinite life
Answers: Please write your answers in the table on the cover sheet [Q1 (i), (ii)].
Q2. A machine component experiences cyclic loading with a maximum stress of A
MPa* and a minimum stress of B MPa (see individual data for values of A and
B).
(i)
(ii)
Calculate the mean stress Sm and the stress amplitude Sa
An S-N curve for the material used in the component is described by the
following equation:
S = 450Nf
Neglecting the influence of mean stress, calculate the number of cycles
to cause failure, N₁, given the stress amplitude calculated above (i.e.
Q2(i)). You may assume that the S-N curve applies to the mean stress
calculated for the component's stress-cycle.
-0.159
Transcribed Image Text:Q1. State whether each of the two statements included in your input values for Q1 are true or false: A. Sufficiently high tensile stress is required for fatigue crack propagation B. Sufficiently high compressive stress is required for fatigue crack propagation C. Fatigue requires sufficient variation in stress magnitude D. Fatigue requires no variation in stress magnitude E. A sufficient number of cycles is required to cause fatigue failure F. A single cycle of loading below the ultimate tensile strength is sufficient for fatigue failure G. Endurance limit implies finite life H. Fatigue limit implies finite life I. Fatigue limit implies infinite life J. Endurance limit implies infinite life Answers: Please write your answers in the table on the cover sheet [Q1 (i), (ii)]. Q2. A machine component experiences cyclic loading with a maximum stress of A MPa* and a minimum stress of B MPa (see individual data for values of A and B). (i) (ii) Calculate the mean stress Sm and the stress amplitude Sa An S-N curve for the material used in the component is described by the following equation: S = 450Nf Neglecting the influence of mean stress, calculate the number of cycles to cause failure, N₁, given the stress amplitude calculated above (i.e. Q2(i)). You may assume that the S-N curve applies to the mean stress calculated for the component's stress-cycle. -0.159
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