compression springs with 300ksi+ ultimate tensile str?
compression springs with 300ksi+ ultimate tensile str?
(OP)
I know that music wire (ASTM A228) has an ultimate tensile strength of ~250 ksi at a .140" diameter. I'm hoping to make a compression spring of that diameter using a material with a higher tensile strength.
Does anyone have any experience making springs out of maraging steels or Aermet alloys? Can it be done? Or does anyone have any other material suggestion for making a compression spring with 300+ ksi tensile strength?
Thanks.
Does anyone have any experience making springs out of maraging steels or Aermet alloys? Can it be done? Or does anyone have any other material suggestion for making a compression spring with 300+ ksi tensile strength?
Thanks.





RE: compression springs with 300ksi+ ultimate tensile str?
Aermet and maraging steels are obvious candidates for spring applications due to their extremely high strength. I am unaware of any spring applications using Aermet (either alloy 100 or 310) but some aerospace spring manufacturers have made springs using maraging steels. I would recommend trying out the first option I mentioned before experimenting with these alloys. Good luck.
RE: compression springs with 300ksi+ ultimate tensile str?
You still may could make the spring with Music wire. Did you considered preseting the spring, etc.
If you can send me your problem description I can look at it and may find a solution. I am the author of an expert system for mechanical spring design and during the last 30 years I designed hundereds of all kind of spring for commercial and aerospace use.
http://www.webspawner.com/users/israelkk...
RE: compression springs with 300ksi+ ultimate tensile str?
http://www.mjwire.com/mjw_rocket.html
RE: compression springs with 300ksi+ ultimate tensile str?
I'm not sure where I can get this information but could anyone help me? I'm trying to put a calc together that will consider the stress at the working deflection and at solid length (worstcase). From SRAM I got the range 49-70% of material UTS. Is this correct?
If so do you know where I can get a list of standard wire dias versus UTS of Music Wire ASTM A228?
Also...(told you it was longwinded)...if I use the formula for coil growth
D^2+d^2+(p^2-d^2)/pi^2
how can I take account of different wire dias and material properties and thermal expansion?
Hope you can help,
cheers
RE: compression springs with 300ksi+ ultimate tensile str?
There are more than 50 common/standard types of wire spring from all kind of metals which can be generally devided into the following groups:
1. PATENTED AND COLD DRAWN CARBON STEEL
2. HARDENED AND TEMPERED CARBON AND LOW ALLOY STEEL
3. AUSTENITIC STAINLESS STEEL
4. PRECIPITATION HARDENING (AGED) STAINLESS STEEL
5. MARTENSITIC STAINLESS STEEL
6. COPPER ALLOYS
7. COPPER BERYLLIUM ALLOYS
8. NICKEL ALLOYS
You can collect information from SAE. AMS, ASTM, MIL-STDS, FED-STD, Internet etc. But note that for most wire materials the UTS is a function of the wire diameter but they can not easily compared by behavior to Music Wire.
The Associated Springs co. design handbook 1987 speeks of 35% to 50% of material UTS as the maximum shear stress.
On page 31 it gives:
O.D.(at solid)=SQRT(D*D+(P*P-d*d)/(Pi*Pi))+d
D=spring mean diameter with no load
d=wire diameter
p=coil pitch
Pi=3.1416...
The spring outside diameter at no load=D+d
The difference O.D.-(D+d) is what you are looking for.
As you can see the wire material properties do not play a role in the diameter change.
http://www.webspawner.com/users/israelkk/