Problem 4: Constrained Modulus A mounting block made of butyl rubber of modulus = 0.0015 GPa is designed to cushion a sensitive device against shock loading. It consists of a cube of the rubber of side length L = 40 mm located in a slot in a rigid plate, exactly as shown in the figure below. The slot and cube have the same cross-sectional dimensions, and the surrounding material is much stiffer, so the strain in one direction is constrained to be zero. A vertical compressive load F is applied, and the downward deflection of the top of the block is d. The maximum expected value of F is 50 N. Find the stiffness of the cube (F/d) in this constrained condition, assuming v = 0.5. Hence find the maximum deflection d of the top face of the block. What would this deflection be without any constraint?
Problem 4: Constrained Modulus A mounting block made of butyl rubber of modulus = 0.0015 GPa is designed to cushion a sensitive device against shock loading. It consists of a cube of the rubber of side length L = 40 mm located in a slot in a rigid plate, exactly as shown in the figure below. The slot and cube have the same cross-sectional dimensions, and the surrounding material is much stiffer, so the strain in one direction is constrained to be zero. A vertical compressive load F is applied, and the downward deflection of the top of the block is d. The maximum expected value of F is 50 N. Find the stiffness of the cube (F/d) in this constrained condition, assuming v = 0.5. Hence find the maximum deflection d of the top face of the block. What would this deflection be without any constraint?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Problem 4: Constrained Modulus A mounting block made of butyl rubber of modulus =
0.0015 GPa is designed to cushion a sensitive device against shock loading. It consists of a cube
of the rubber of side length L = 40 mm located in a slot in a rigid plate, exactly as shown in the
figure below.
The slot and cube have the same cross-sectional dimensions, and the surrounding material is much
stiffer, so the strain in one direction is constrained to be zero. A vertical compressive load F is
applied, and the downward deflection of the top of the block is d. The maximum expected value
of F is 50 N. Find the stiffness of the cube (F/d) in this constrained condition, assuming v = 0.5.
Hence find the maximum deflection d of the top face of the block. What would this deflection be
without any constraint?
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