Q3. A circular, steel, rotating shaft is subjected to a bending moment of M Nm* and direct tensile force, F, Figure 1. * See individual data for value of M ↓ 30mm F M Soderberg Equation: S = Sp Figure 1 Calculate the maximum tensile force, F, that can be applied to the shaft without causing fatigue failure using the Soderberg Equation and the following data for steel: Sy =290MPa., Fatigue Limit Stress (SD) = 200MPa (for fully reversed conditions) Sm S F y TI

Elements Of Electromagnetics
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at question        A=110 MPa       B=-60 MPa            M=145 N.m

Q3. A circular, steel, rotating shaft is subjected to a bending moment of M Nm* and
direct tensile force, F, Figure 1.
* See individual data for value of M
↓
30mm
F
M
Figure 1
Calculate the maximum tensile force, F, that can be applied to the shaft without
causing
fatigue failure using the Soderberg Equation and the following data for steel:
Sy =290MPa., Fatigue Limit Stress (SD) = 200MPa (for fully reversed conditions)
Soderberg Equation: S = S 1-
S.
F
y
Transcribed Image Text:Q3. A circular, steel, rotating shaft is subjected to a bending moment of M Nm* and direct tensile force, F, Figure 1. * See individual data for value of M ↓ 30mm F M Figure 1 Calculate the maximum tensile force, F, that can be applied to the shaft without causing fatigue failure using the Soderberg Equation and the following data for steel: Sy =290MPa., Fatigue Limit Stress (SD) = 200MPa (for fully reversed conditions) Soderberg Equation: S = S 1- S. F y
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, Nf, 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: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, Nf, 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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