invar36 can be used instead of spring steel
invar36 can be used instead of spring steel
(OP)
Dear friends,
Want to make a spring which has stable or very less thermal expansion coeff. Material Invar(FeNi36)(UnsK93600) or Thermelast were found to be very ideal with negligible thermal expansion (ie ~1ppm/K).But can it provide almost same performance as Spring steel;if endurance limit,fatigue etc are consider.Any alternative materials which can be used.Please help friends.....!!
Want to make a spring which has stable or very less thermal expansion coeff. Material Invar(FeNi36)(UnsK93600) or Thermelast were found to be very ideal with negligible thermal expansion (ie ~1ppm/K).But can it provide almost same performance as Spring steel;if endurance limit,fatigue etc are consider.Any alternative materials which can be used.Please help friends.....!!





RE: invar36 can be used instead of spring steel
Without any spring details or loads how do you expect anyone to give you an answer,
desertfox
RE: invar36 can be used instead of spring steel
will try to explain with example.
now i m using spring steel spring,
for force P1 my spring deforms X1
when i apply force P2 my spring deforms X2
again when i apply Force P1 my spring deforms to X3 and not X1 due to temperature (thermal expansion coeff)
So when i use Material Invar with negligible thermal expansion coeff this error is reduce drastically .But i m afraid in doing so Spring steel properties like fatigue,endurance limit etc will be compromised .
force is not a concern as they are not very high i m worried about the deformation.need a repeatable deformation on every force.with spring steel this repeatability is good at const temperature.to eliminate this temp. effect wanna use invar material
RE: invar36 can be used instead of spring steel
Without specific numbers for your spring no one can give you an answer
desertfox
RE: invar36 can be used instead of spring steel
There are alloys which have very small changes in Young's modulus vs. temperature (important if constant spring force is the requirement, e.g. a torsion spring), examples include Elinvar, Nivaflex.
To get REALLY low, really repeatable tempco, use fused silica or quartz.
RE: invar36 can be used instead of spring steel
RE: invar36 can be used instead of spring steel
ht
RE: invar36 can be used instead of spring steel
Invar "super" at best is 0.8, but "regular" grade is 1.5, and can be as high as 6. Point being it can vary depending on stress, time, composition variables, prior heat treatment history.
RE: invar36 can be used instead of spring steel
RE: invar36 can be used instead of spring steel
RE: invar36 can be used instead of spring steel
b- all glasses will be brittle and will endure only limited strain and are "difficult" to fabricate
c- are there other ways to compensate for ther thermal effects?
d- are your other materials parameters controlled enough to justify such as search beyond those listed?