numbersguy123
Structural
- Nov 13, 2019
- 4
Hello everyone,
I'm trying to analyze the behavior of 2 bimetallic materials driven by a temperature load. I am having some issues trying to validate my calculations and FEA simulations, so I'm seeking help. Here's what I have done and let me know if you have any suggestions to improve my methods:
I have a steel sheet (0.03" thick) and AL (0.09" thick) plate that are permanently pressed/joined together. Both are roughly 18" long and 12" wide. The metals are being cooled by 102 deg F, so there is stress build up due to the CTE mismatch. AL will shrink more so it will also deflect. My main issue is trying to
I found that there is a radius of curvature equation derived nicely in this wiki page for bimetallic materials:
I went through the calculations, and got a radius of curvature value which eventually allowed me to see how far the composite beam is deflecting assuming it's fixed on one end.
I am using FEMAP to model this problem but the deflection values do not match up to analytical solutions so now I'm have doubts in both my modeling and my calculations. I modeled the metals using solids elements in one case and plate elements in the other. Plate deflections are a bit closer (4.61") while solid deflections are lower at 1.92", assuming my analytical prediction is correct for deflection = 3.85". I'm interested in deflection, but more importantly, the stresses at the interface.
I used Membrane elements as well, but I didn't get good results, sine most of the deflection is 2D. I also tried using 3-2-1 constraint method to see how the piece would naturally deform given the temperature load, but it's something I just learned and I don't have a good way to validate the results, since the boundary conditions are tricky in this regard.
Any suggestions on how to match model results to calculations? Thanks for your help!
I'm trying to analyze the behavior of 2 bimetallic materials driven by a temperature load. I am having some issues trying to validate my calculations and FEA simulations, so I'm seeking help. Here's what I have done and let me know if you have any suggestions to improve my methods:
I have a steel sheet (0.03" thick) and AL (0.09" thick) plate that are permanently pressed/joined together. Both are roughly 18" long and 12" wide. The metals are being cooled by 102 deg F, so there is stress build up due to the CTE mismatch. AL will shrink more so it will also deflect. My main issue is trying to
I found that there is a radius of curvature equation derived nicely in this wiki page for bimetallic materials:
I went through the calculations, and got a radius of curvature value which eventually allowed me to see how far the composite beam is deflecting assuming it's fixed on one end.
I am using FEMAP to model this problem but the deflection values do not match up to analytical solutions so now I'm have doubts in both my modeling and my calculations. I modeled the metals using solids elements in one case and plate elements in the other. Plate deflections are a bit closer (4.61") while solid deflections are lower at 1.92", assuming my analytical prediction is correct for deflection = 3.85". I'm interested in deflection, but more importantly, the stresses at the interface.
I used Membrane elements as well, but I didn't get good results, sine most of the deflection is 2D. I also tried using 3-2-1 constraint method to see how the piece would naturally deform given the temperature load, but it's something I just learned and I don't have a good way to validate the results, since the boundary conditions are tricky in this regard.
Any suggestions on how to match model results to calculations? Thanks for your help!