Part A helical compression spring is required to provide a minimum force of 150 lb at installation and have a working deflection of 1 in. The spring rate is 75 lb/in. The coil must fit in a 2.1-in-dia hole with 0.1 in clearance. Use 0.25-in diameter unpeened music wire and squared/ground ends. Use a 15% clash allowance, shear modulus G = 11.5 Mpsi, and weight density y = 0.285 lb/in°. Assume Sy, = 0.6Sut - Find Expr-

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter11: Columns
Section: Chapter Questions
Problem 11.2.15P: Repeat Problem 11.2-14 using L = 12 ft, ß = 0.25 kips/in., ßRl= 1.5ßL2, and ßR2= 2 ßR1.
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Part A
A helical compression spring is required to provide a minimum
force of 150 lb at installation and have a working deflection of
1 in. The spring rate is 75 lb/in. The coil must fit in a
2.1-in-dia hole with 0.1 in clearance. Use 0.25-in diameter
Find the shear stress at the initial deflection.
Express your answer in pounds per square inch to three significant figures.
unpeened music wire and squared/ground ends. Use a 15%
clash allowance, shear modulus G = 11.5 Mpsi, and weight
0 ΑΣφ
vec
?
density y = 0.285 lb/in. Assume Sys = 0.6.Sut -
Ti = 51974.5
psi
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 5 attempts remaining
Part B
Find the mean stress.
Express your answer in pounds per square inch to three significant figures.
vec
?
Tm =
psi
Submit
Request Answer
Transcribed Image Text:Part A A helical compression spring is required to provide a minimum force of 150 lb at installation and have a working deflection of 1 in. The spring rate is 75 lb/in. The coil must fit in a 2.1-in-dia hole with 0.1 in clearance. Use 0.25-in diameter Find the shear stress at the initial deflection. Express your answer in pounds per square inch to three significant figures. unpeened music wire and squared/ground ends. Use a 15% clash allowance, shear modulus G = 11.5 Mpsi, and weight 0 ΑΣφ vec ? density y = 0.285 lb/in. Assume Sys = 0.6.Sut - Ti = 51974.5 psi Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B Find the mean stress. Express your answer in pounds per square inch to three significant figures. vec ? Tm = psi Submit Request Answer
A helical compression spring is required to provide a minimum
force of 150 lb at installation and have a working deflection of
1 in. The spring rate is 75 lb/in. The coil must fit in a
2.1-in-dia hole with 0.1 in clearance. Use 0.25-in diameter
Part C
unpeened music wire and squared/ground ends. Use a 15%
clash allowance, shear modulus G = 11.5 Mpsi, and weight
density y = 0.285 lb/in. Assume Sys = 0.6.Sut .
Find the alternating stress in the coil.
Express your answer in pounds per square inch to three significant figures.
vec
?
Ta =
psi
Submit
Request Answer
Part D
Find the fatigue safety factor for infinite life in shear.
Express your answer using three significant figures.
ΑΣφ
?
vec
Njs =
Submit
Request Answer
Transcribed Image Text:A helical compression spring is required to provide a minimum force of 150 lb at installation and have a working deflection of 1 in. The spring rate is 75 lb/in. The coil must fit in a 2.1-in-dia hole with 0.1 in clearance. Use 0.25-in diameter Part C unpeened music wire and squared/ground ends. Use a 15% clash allowance, shear modulus G = 11.5 Mpsi, and weight density y = 0.285 lb/in. Assume Sys = 0.6.Sut . Find the alternating stress in the coil. Express your answer in pounds per square inch to three significant figures. vec ? Ta = psi Submit Request Answer Part D Find the fatigue safety factor for infinite life in shear. Express your answer using three significant figures. ΑΣφ ? vec Njs = Submit Request Answer
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