Answered: thermal expansion coefficient

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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Question

Determine the thermal shock resistance for a tool steel with the following

properties: tensile strength σ = 2000MPa, thermal conductivity k = 51.9 W/m℃,

elastic modulus E = 200 000 MPa, and thermal expansion coefficient α = 12.1

m/m℃.A fix inclined-plane thrust bearing is designed to carry a total normal load of
50kN at optimum capacity with the following specifications: ro = 100mm, ri =
50mm, N = 3600 rpm, l/b = 1, b = 40mm, hi – h0 = 25 μm and SAE 20 oil is used
with an inlet temperature of 55℃ (μd = 29 cP). Determine the minimum film
thickness assuming that the change in oil is negligible.

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