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  3. a helical compression spring has 14 active coils a

A helical compression spring has 14 active coils and the free length is 12.5in. The outside...

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Mechanical Engineering

A helical compression spring has 14 active coils and the freelength is 12.5in. The outside diameter is 7/16 in and the springhas squared and ground ends. The end plates are constrained to beparallel. The material is music wire with presetting. The wirediameter is 0.042 in. Determine: (1) for static conditions computethe spring index, the solid length, the stress when the spring iscompressed to the solid length. Check if static yielding occurswhile the spring is brought to its solid length; (2) for dynamicconditions with Pmin=0.9 lb and Pmax=2.9 lb, check if the springexperiences torsional endurance limit fatigue torsional yielding,or torsional fatigue failure. Assume a survival probability of 90%,unpeened coil, and fatigue failure based on 50x103 cycles

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