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3. A steel bar undergoes cyclic loading such that Omax = 413MPa and Omin = -138MPa,...
A 1045 hot rolled steel rod undergoes axial cyclic loading from a minimum stress of 2...
A 1045 hot rolled steel rod undergoes axial cyclic loading from a minimum stress of 2 kpsi to a maximum of 10 kpsi. The rod has a hole in the center of bar, with a Kt 1.7, and notch sensitivity factor 0.9. The yield strength of bar is 45 kpsi, ultimate strength 82 kpsi, fully endurance limit of 20 kpsi, fatigue strength fraction 0.85. 1. a. Using modified goodman criteria, find FOS b. lfinfinite life is not predicted estimate the...
answer E,F,G and H please 2. A bar of steel undergoes cyclic loading such that max...
answer E,F,G and H please
2. A bar of steel undergoes cyclic loading such that max = 60 kpsi and Omin = -20 kpsi. For the material, Sut = 80 kpsi, 5y = 65 kpsi,ka = 1.107. ky = 0.858, ke = ka = k, = k, = 1, and f = 0.9. (a) Calculate the alternating stress. (2 points) (b) Calculate the meani median) stress. (2 points) (c) Calculate the fully corrected endurance limit. (6 points) (d) Calculate the...
Problem 1 The machined steel bar shown in the figure undergoes fully reversed axial loading at...
Problem 1 The machined steel bar shown in the figure undergoes fully reversed axial loading at a nominal alternating stress of 30 ksi. 1. Find the safety factor for an infinite life of the bar if the critical section of this filleted bar in tension is assumed at the shoulder fillet. 2. How many cycles of stress can be expected? Given: The corrected endurance limit Se = 35 ksi. Material Ultimate Tensile Strength Sut = 100 ksi. Material Yield Strength...
The shaft shown is made of AISI 1040 CD steel
The shaft shown is made of AISI 1040 CD steel. It is machine finished and is subjected to a repeated bending stress of 15ksi. The diameter at the shoulder is 1.3in and will be used at a temperature of 400F. Estimate: (a) The endurance limit at 95% reliability (b) Endurance strength at 105 cycles and show on S-N plot 10 (c) Plot the design region by Modified Goodman theory and determine if failure is by yield or fatigue (d) Find the factor of safety...
A bar of steel has the minimum properties Se = 40 kpsi, Sy = 60 kpsi,...
A bar of steel has the minimum properties Se = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The bar is subjected to a steady torsional stress (τm) of 19 kpsi and an alternating bending stress of (σa) 10.2 kpsi. Find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatigue failure or the expected life of the part. Based on: A. modified Goodman criterion B. Gerber criterion...
Question 1 A flat leaf spring made from AISI 1020 cold drawn steel has fluctuating stresses between the maximum stre...
Question 1 A flat leaf spring made from AISI 1020 cold drawn steel has fluctuating stresses between the maximum stress, Smar of 360 MPa and minimum stress, Smn of 160 MPa; applied for a duration of 8 (10) cycles. The AISI 1020 CD material has a fully corrected endurance strength of Sa 5 175 MPa, yield strength, S, of 390 MPa and ultimate strength, S of 470 MPa. Assume that the fatigue strength fraction, f of 0.9 Using Miner's method,...
A bar of steel has the minimum propertiesSe = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi.
A bar of steel has the minimum propertiesSe = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The bar is subjected to a steady torsional stress (τm) of 19 kpsi and an alternating bending stress of (σa) 9.6 kpsi. Find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatigue failure or the expected life of the part.A. Find the factor of safety. For the fatigue analysis, use...
Q6. (a) Three identical fatigue specimens (denoted A, B and C) are fabricated from a non-ferrous...
Q6. (a) Three identical fatigue specimens (denoted A, B and C) are fabricated from a non-ferrous alloy. Each is subjected to one of the maximum- minimum stress cycles listed in Table 26 (the frequency is the same for all tests) Table 26 Specimen Omax (MPa) Omin (MPa) A +450 -150 +300 -300 +500 -200 Rank the three specimens in terms of their fatigue lifetimes (highest to lowest). Justify this ranking [5 marks] (b) A cylindrical tie rod of diameter 20...
A bar of steel has the minimum properties Se 276 MPa, Sy The bar is subjected...
A bar of steel has the minimum properties Se 276 MPa, Sy The bar is subjected to a steady torsional stress of 103 MPa and an alternating of 172 MPa. Find th of safety guarding against a fatigue failure or the expected life of the p analysis use: (a) Modified Goodman criterion. (b) Gerber criterion. (c) ASME-elliptic criterion. 413 MPa, and Suu 551 MPa. bending stress e factor of safety guarding against a static farlure, ånd either the factor art....
A 1020 steel shaft 3. A 1020 steel shaft has a corrected real endurance limit of...
A 1020 steel shaft
3. A 1020 steel shaft has a corrected real endurance limit of Se 40 ksi and a tensile strength of Sut 64 ksi. The shaft is loaded in bending and torsion such that Ma 500 lbf.in, and Tm 300 lbf.in, Mm Ta 0. The stress concentration factors were determined to be Kr 2.25, and Kf 1.75. Provided the design engineer choose a diameter of d 1.0 in, determine the factor of safety n of the shaft...
A 1045 hot rolled steel rod undergoes axial cyclic loading from a minimum stress of 2 kpsi to a maximum of 10 kpsi. The rod has a hole in the center of bar, with a Kt 1.7, and notch sensitivity factor 0.9. The yield strength of bar is 45 kpsi, ultimate strength 82 kpsi, fully endurance limit of 20 kpsi, fatigue strength fraction 0.85. 1. a. Using modified goodman criteria, find FOS b. lfinfinite life is not predicted estimate the...
answer E,F,G and H please
2. A bar of steel undergoes cyclic loading such that max = 60 kpsi and Omin = -20 kpsi. For the material, Sut = 80 kpsi, 5y = 65 kpsi,ka = 1.107. ky = 0.858, ke = ka = k, = k, = 1, and f = 0.9. (a) Calculate the alternating stress. (2 points) (b) Calculate the meani median) stress. (2 points) (c) Calculate the fully corrected endurance limit. (6 points) (d) Calculate the...
Problem 1 The machined steel bar shown in the figure undergoes fully reversed axial loading at a nominal alternating stress of 30 ksi. 1. Find the safety factor for an infinite life of the bar if the critical section of this filleted bar in tension is assumed at the shoulder fillet. 2. How many cycles of stress can be expected? Given: The corrected endurance limit Se = 35 ksi. Material Ultimate Tensile Strength Sut = 100 ksi. Material Yield Strength...
Question 1 A flat leaf spring made from AISI 1020 cold drawn steel has fluctuating stresses between the maximum stress, Smar of 360 MPa and minimum stress, Smn of 160 MPa; applied for a duration of 8 (10) cycles. The AISI 1020 CD material has a fully corrected endurance strength of Sa 5 175 MPa, yield strength, S, of 390 MPa and ultimate strength, S of 470 MPa. Assume that the fatigue strength fraction, f of 0.9 Using Miner's method,...
Q6. (a) Three identical fatigue specimens (denoted A, B and C) are fabricated from a non-ferrous alloy. Each is subjected to one of the maximum- minimum stress cycles listed in Table 26 (the frequency is the same for all tests) Table 26 Specimen Omax (MPa) Omin (MPa) A +450 -150 +300 -300 +500 -200 Rank the three specimens in terms of their fatigue lifetimes (highest to lowest). Justify this ranking [5 marks] (b) A cylindrical tie rod of diameter 20...
A bar of steel has the minimum properties Se 276 MPa, Sy The bar is subjected to a steady torsional stress of 103 MPa and an alternating of 172 MPa. Find th of safety guarding against a fatigue failure or the expected life of the p analysis use: (a) Modified Goodman criterion. (b) Gerber criterion. (c) ASME-elliptic criterion. 413 MPa, and Suu 551 MPa. bending stress e factor of safety guarding against a static farlure, ånd either the factor art....
A 1020 steel shaft
3. A 1020 steel shaft has a corrected real endurance limit of Se 40 ksi and a tensile strength of Sut 64 ksi. The shaft is loaded in bending and torsion such that Ma 500 lbf.in, and Tm 300 lbf.in, Mm Ta 0. The stress concentration factors were determined to be Kr 2.25, and Kf 1.75. Provided the design engineer choose a diameter of d 1.0 in, determine the factor of safety n of the shaft...
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