The following data refers to an extension spring made from AISI 1085 music wire: mean coil diameter 15 mm; wire diameter = 1.8 mm; number of active coils 53. The spring is made with full round hooks and is wound with an initial tension which induces a stress of 115 MPa in the wire. %3D Calculate: a) The spring rate, k. b) The ultimate tensile strength and the torsional stress at yield. c) The initial tension and the force required to overcome it.

The following data refers to an extension spring made from AISI 1085 music wire: mean coil diameter 15 mm; wire diameter = 1.8 mm; number of active coils 53. The spring is made with full round hooks and is wound with an initial tension which induces a stress of 115 MPa in the wire. %3D Calculate: a) The spring rate, k. b) The ultimate tensile strength and the torsional stress at yield. c) The initial tension and the force required to overcome it.

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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3. A helical compression spring with squared and ground ends is made of music wire. It is to have a spring rate of 2,400 N/m. The force corresponding to a solid length is 120 N. The spring index is set to be 10. At closure use a design factor of 1.2 guarding against yielding. For static loading, determine the wire diameter, the mean coil diameter, the number of coils, the free and solid lengths of the spring, and show whether buckling may occur. The helical spring of Problem 3 is subjected to a fluctuating load varying between 20 N and 100 N in service. Estimate the factor of safety guarding against fatigue-failure using a torsional Goodman fatigue criterion with Zimmerli data.
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