Spring Creep?
Spring Creep?
(OP)
I have an extension spring that is used (theoretically well below its yielding point) and used at room temperature.
It is under constant loading (yield load is around 65kg~, constant load is no more than 10-20kg) and within one day it stretched out and didn't return to its original shape.
Obviously there is some problem with the spring. The material is steel. Assuming that the material is perfectly fine, what could cause this "creep" to happen? Heat treatment time to little?
Thanks in advance
It is under constant loading (yield load is around 65kg~, constant load is no more than 10-20kg) and within one day it stretched out and didn't return to its original shape.
Obviously there is some problem with the spring. The material is steel. Assuming that the material is perfectly fine, what could cause this "creep" to happen? Heat treatment time to little?
Thanks in advance





RE: Spring Creep?
http://www.mw-ind.com/pdfs/ResidualStressProcessin...
http://www.lambdatechs.com/documents/275.pdf
http://www.navsea.navy.mil/nswc/carderock/src/mech...
http://www.leespring.com/downloads/uk/leespring_en...
RE: Spring Creep?
A full manufacturing drawing or a catalog number (if it is a standard off the shelf spring) is best.
Otherwise, the following data is a start:
Number of coils
Wire diameter
Outside diameter
Shape of ends (drawing)
Wire material
Spring body length between the ends
RE: Spring Creep?
i've looked up some information on relaxation/creep and it depends on the degree of stress, temperature and time, which is why it confuses me since the stress is low, the temperature is room temperature and the time is only 1 day.
what are the possible causes of failure for this stretching of the spring?
RE: Spring Creep?
RE: Spring Creep?