## Spring constant

## Spring constant

(OP)

Is there an online source for the spring constant for different materials. I think it is also known as the spring stiffness and has units n/m. It is easy to find data such as the yield of a material, but I can't any data on the spring stiffness. I am specifically looking for the spring stiffness of 316L stainless steel and carbon steel grade 12.9

Thanks

Thanks

## RE: Spring constant

The best online source of material properties that I'm aware of is www.matweb.com

## RE: Spring constant

Nice to check these things though

## RE: Spring constant

## RE: Spring constant

The spring constant concept above is the basis for the finite element or matrix methods of structural analysis.

## RE: Spring constant

I even would venture to say that it is the mother of all computer methods of structural analysis.

Structures are longer solved by complicated differential equations but are simulated as small springs (with rotational and torsional stiffness thrown in if appropiate). The power of the computer is to assemble the springs faithfully according to our instructions (nodal coordinates and member connection etc) and solve tediously a huge number of simultaneous equations for the deflection on receiving the loading information. If we have to do it by hand to solve the same huge number of simultaneous equations it can take us a life time just for one structure but the computer can do it before you finish reading this post.

The computer treats a structure as one huge spring except that it has many sub-springs able deform in many directions. We put load in it and out go the deflection.

100 times the load will turn out 100 times deflection. (unless it is a specialised software written for nonlinear or inelastic analyses). Luckily the computer does not know when the structure fail and that is where the engineer fits in.

The axial spring constant EA/L is always found on any structure member and is the simplest of all stiffness terms.