Controling yield strength of spring steel AISI 1075
Controling yield strength of spring steel AISI 1075
(OP)
I am designing a backplate for a graphics card and am trying to use a single sheet of stamped spring steel with tab cutouts as my force to maintain pressure on the gpu and various other components needing cooling. There would also be a thin piece of plastic underneath this like nylon, to get the deflection required on the tabs. I am using AISI 1075 steel sheet, but am having trouble inputting the tensile strength into Solidworks to do a stress analysis to ensure the tabs do not yield and provide constant force on the card. treating the steel can vary the strength significantly. what kind of spec can I use to ensure my results in my simulation is accurate. I am assuming it is the yield strength that will determine whether or not I would get permanent deflection, as the modulus of elasticity is relatively the same with most steel?





RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
In your FEA are you using an enforced displacement or a force? If I read your description correctly you should be dictating the displacement (thickness of nylon?) of the tab and "backing out" the resultant stresses. Also, your output is in [very small] displacement rather than VM Stress, is that intentional?
You mention things "needing cooling"--is this metal sheet intended to perform heat dissipation or is it intended to "push" things into contact with what will ultimately be sinking the heat? Steel is not a particularly good conductor.
RE: Controling yield strength of spring steel AISI 1075
Part of the beauty of doing FEA with steel is that the elastic modulus is the same for all grades of steel. This does not change significantly with steel grade or yield strength. Unless you are running a non-linear material with yield, you don't actually need to input the yield strength to get your stress values. Just run it linear and see where the stresses end up. It doesn't take calculus to see if the stresses are below yield.
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
Inch-lbs is not a unit of force. Something doesn't add up with your description.
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
RE: Controling yield strength of spring steel AISI 1075
I also have some questions regarding how you apply the forces to the tabs. If the applied force is constant and acting along a fixed axis, then the moment on the tab will change as it bends. If the applied force remains normal to the tab surface as it bends, then the moment on the tab will not change so much.