Find the Fs for a spring with the same data as Problem 1, except that R equals 15 mm.
Problem 1
A helical spring is subjected to a continuously varying load. No. 7 oil-tempered wire is used with a mean radius of helix of 13 mm. In the most compressed condition, the force is 400 N. After 8 mm of release, the minimum force is 260 N. Find the factor of safety and the number of active coils.
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