An automobile engine has a valve spring is to be made of Fe, C, & Mn, to be oil-tempered, & to be designed that should not exceed to a cylindrical space of 1%-in in diameter. The spring index should be 6.0, the coil-to-coil distance of 0.33 in, & the maximum load it will sustain is 100lb with the corresponding compression of 1/2-in. The spring is subjected to repeated loading & fatigue must be considered by a factor of safety of 2.25. Determine: (a) the diameter of wire based on commercial sizes; (b) the total number of coils; (c) the free length of the spring.

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter2: Axially Loaded Members
Section: Chapter Questions
Problem 2.2.11P: A small lab scale has a rigid L-shaped frame ABC consisting of a horizontal arm AB (length b = 10...
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An automobile engine has a valve spring is to be made of Fe, C, & Mn, to be oil-tempered, & to be
designed that should not exceed to a cylindrical space of 134-in in diameter. The spring index should be
6.0, the coil-to-coil distance of 0.33in, & the maximum load it will sustain is 100lb with the corresponding
compression of ½/2-in. The spring is subjected to repeated loading & fatigue must be considered by a factor
of safety of 2.25. Determine:
(a) the diameter of wire based on commercial sizes;
(b) the total number of coils;
(c) the free length of the spring.
Sample image of valve spring in an assembly.
Transcribed Image Text:An automobile engine has a valve spring is to be made of Fe, C, & Mn, to be oil-tempered, & to be designed that should not exceed to a cylindrical space of 134-in in diameter. The spring index should be 6.0, the coil-to-coil distance of 0.33in, & the maximum load it will sustain is 100lb with the corresponding compression of ½/2-in. The spring is subjected to repeated loading & fatigue must be considered by a factor of safety of 2.25. Determine: (a) the diameter of wire based on commercial sizes; (b) the total number of coils; (c) the free length of the spring. Sample image of valve spring in an assembly.
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