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2021 | OriginalPaper | Chapter

6. Coiling of Helical Springs

Author : Vladimir Kobelev

Published in: Durability of Springs

Publisher: Springer International Publishing

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Abstract

In this chapter the method for calculation of residual stress and plastic bending and torsion moments for combined bending-torsion load is developed. The Bernoulli’s hypothesis is assumed for the deformation of the bar. The analysis was provided using deformational theory of plasticity with a nonlinear stress strain law describing active plastic deformation (SAE AE-22, Sect. 8.3.33). The curvature and twist of the bar during the plastic loading increase proportionally, such that the ratio curvature to twist remains constant. The complete solutions based on this approximate material law provide closed analytical solution. The unloading is linear elastic. This chapter is the primary section of second part, which studies mechanical problems arising during the manufacturing of helical springs.

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previous chapter Thin-Walled Rods with Semi-opened Profiles

next chapter Presetting and Residual Stresses in Springs

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Title: Coiling of Helical Springs
Author: Vladimir Kobelev
Publisher: Springer International Publishing
Book: Durability of Springs
Print ISBN: 978-3-030-59252-3

Electronic ISBN: 978-3-030-59253-0

Copyright Year: 2021
DOI: https://doi.org/10.1007/978-3-030-59253-0_6

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