The extension spring shown in the figure has full-twisted
Chapter 10, Problem 10.36(choose chapter or problem)
The extension spring shown in the figure has full-twisted loop ends. The material is AISI 1065 OQ&T wire. The spring has 84 coils and is close-wound with a preload of 16 lbf. (a) Find the closed length of the spring. (b) Find the torsional stress in the spring corresponding to the preload. (c) Estimate the spring rate. (d) What load would cause permanent deformation? (e) What is the spring deflection corresponding to the load found in part d?
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