The Science and Engineering of Materials (MindTap Course List)
The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
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Chapter 1, Problem 1.15P
To determine

Selection of Silicon Nitride (Si3N4) as a spring material.

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Give short answers to the below questions i. What is the same in each spring for a combination of springs in parallel? ii. In general, how is the equivalent stiffness of a combination of springs calculated? iii. What is the torsional stiffness of an annular steel shaft (G=80X109 N/m2) with a length of 2.5m, inner radius of 10cm and outer radius of 15cm? iv. What is the torsional stiffness of a solid aluminum shaft (G=40X109 N/m2) with a length of 1.8m and a radius of 25cm? v. Calculate the static deflection in a liner spring stiffness 4000N/m when a mass of 20kg is hanging from it.
Which of the statements below are accurate regarding the stress-strain behavior of polymers: (This question has more than one correct answer) а. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stress under constant strain rate b. As temperature is reduced, the necking behavior of plastic tensile bars completely disappears С. The slope of the stress-strain curve for totally elastic and brittle polymers is always positive d. The stress-strain curve for vulcanized elastomers has a greater slope than unvulcanized polymers throughout
A titanium tube with an outside diameter of 25 mm and inside diameter of 20 mm and a length of 200 mm. When an elastic uniaxial tensile force of 30 kN is applied to this tube along its length, what is the final length of that tube? (Modulus of elasticity of Titanium is 105 GPa)

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The Science and Engineering of Materials (MindTap Course List)

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