Question

ASTM A229 oil-tempered carbon steel is used for a helical coil spring. The spring is wound with D = 50 mm d = 10.0 mm, and a pitch (distance between corresponding points of adjacent coils), of 14 mm. If the spring is compressed solid, would the spring return to its original free length when the force is removed?

Answer 1

Answer: he got the answer above

Answer 2

given,

D = 50 mm = 0.05 m

d = 10 mm = 0.01 m

Force to compress the spring

`F = (d^4G\delta)/(8D^3N)`

`(\delta)/(N) = p - d = 14 - 10 = 4 mm`

`F = (d^4G)/(8D^3)* 0.004`

`F = (0.1^4* 79* 10^9)/(8* 0.05^3)* 0.004`

F = 3160 N

stress correction factor from stress correction curve is equal to 1.1

now, calculation of corrected stress

`\tau = (8FDk_s)/(\pi d^3)`

`\tau = (8* 3160 * 0.05 * 1.1)/(\pi * 0.01^3)`

= 442.6 Mpa

The tensile strength of the steel material of ASTM A229 is equal to 1300 Mpa

now,

`\tau_s \leq 0.45 S_u`

`\tau_s \leq 0.45 * 1300`

`\tau_s \leq 585\ Mpa`

since corrected stress is less than the
`\tau_s`

hence, spring will return to its original shape.