Answered: a.) Plot the S-N curve for this alloy.…

a.) Plot the S-N curve for this alloy. b.) Does this material have an endurance limit? Explain. c.) Determine the fatigue strength at 5 x 105 cycles.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter6: Introduction To Mechanical Properties

Section: Chapter Questions

Problem 6.5P

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Concept explainers

Alloys

An alloy is an admixture of two or more metals or a metal and a non-metal. Since ancient times, man has been using alloys. Alloying helps to retain the properties of the parent matter, such as hardness, strength, toughness, ductility and is corrosion-resistant. Copper alloys such as brass have antimicrobial properties that help to fight against (Coronavirus disease 2019) COVID-19 and other hospital-acquired infections. Some common alloys are brass, bronze, solder steel, etc. Most alloys have a lower melting point than their constituents. This is due to the presence of a nonmetal as one of the constituents that behaves as an impurity and restricts the raise of melting point.

Question

3. Given the following fatigue data for a brass alloy:
Cycles to Failure
2 x 105
1х 106
Stress Amplitude (MPa)
310
223
191
3х 106
168
1 x 107
153
3х 107
143
1х 108
134
3х 108
127
1х 109
a.) Plot the S-N curve for this alloy.
b.) Does this material have an endurance limit? Explain.
c.) Determine the fatigue strength at 5 x 105 cycles.
d.) Determine the fatigue life for 200 MPa.
e.) If the loading in part c is uniaxial, what is the minimum diameter of a circular rod
required for this application if the maximum load is 500 kN?

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