Rerun your model with double the number of elements through the thickness to see if that changes the result. If it does double it again. This is called a Mesh Refinement Study.

A screen snapshot of a spreadsheet would help with setup data such as Exp. Sample Length, Mod. Sample Length

and columns such as:

Exp. Disp., Exp. Strain, Exp. Force, Model Disp. Model Strain, Model Force

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Next, assemble a list of all the parameters that have a range of uncertainty.

- Length
- Width
- Layer 1 Thickness
- Layer 2 Thickness
- Layer 3 Thickness
- Layer 4 Thickness
- Layer 1 Modulus
- Layer 2 Modulus
- Layer 3 Modulus
- Layer 4 Modulus
- Layer 1 CTE
- Layer 2 CTE
- Layer 3 CTE
- Layer 4 CTE
- Delta T for Layer 1
- Delta T for Layer 2
- Delta T for Layer 3
- Delta T for Layer 4

Assign a range for each uncertainty, then assign the worst case for each parameter that will push the Force higher or lower and label those values F+ and F-. Run a model with all the parameters at F+ and run another model with all the parameters at F- and show the possible variation in the model caused by variations in the input to the model. See if your experimental result falls between the F+ and the F- curves.