Materials Science And Engineering Properties
Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 9, Problem 6ETSQ
To determine

The super alloy with highest strength in a 1000 hour stress rupture test at a temperature of 1090°C .

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For a bronze alloy, the stress at which plastic deformation begins is 275 MPa (40,000 psi), and the modulus of elasticity is 115 GPa (16.7 x106 psi). (a) What is the maximum load that may be applied to a specimen with a cross-sectional area of 325 mm2 (0.5 in.2) without plastic de- formation? (15pts)(b) If the original specimen length is 115 mm (4.5 in.), what is the maximum length to which it may be stretched without causing plastic deformation?(15pts)
Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder C. Polishing to reduce surface defects Od. Increasing its volume, to give a larger cross sectional area Oe. Increasing the grain size so there are less grain boundaries to initiate failure
(Solid Mechanics) A setup for single-edge-notch-bending (SENB) tests is shown below. Support rollers provide frictionless contact with the specimen, while a load is applied at the middle of the top surface of specimen. The thickness of the specimen is 10 mm and the height W 10mm. The properties for this ductile alloy are E = 70 GPa, v=0.3, σᵧ = 400 MPa, Kᵢ? = 25 MPa.m¹/². (1) Ignore any crack or defects in the material, what is the maximum static force that the specimen could carry before failure? (2) A cyclic load of low amplitude 2.8 kN is applied. Because of the cyclic load a defect is nucleated on the edge and grows into a fatigue crack of 2 mm length shown in the right. If the cycling is interrupted, what is the maximum static tensile force that the specimen could carry? (3) With more cycles, the fatigue crack keeps growing. Estimate the critical crack length (a range is fine) at which the plate will fail from the low-amplitude cyclic load 2.8 kN only. (maximum two iterations are…
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Materials Science And Engineering Properties
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ISBN:9781111988609
Author:Charles Gilmore
Publisher:Cengage Learning
Material Properties 101; Author: Real Engineering;https://www.youtube.com/watch?v=BHZALtqAjeM;License: Standard YouTube License, CC-BY