Find function help

[felder]

I am using the find function to return solutions for a system of three equations. I understand that the solutions returned can be different based on guess values and tolernace of the solver. currently I cannot get the solver to return the correct solution. I am checking the solutions by using the outputs to recalculate one of the given equations.

Is the find function not the correct way to solve for these variables? Should I be using arrays, or Max/Min of function.

I am very new to Mathcad, and I am trying to use it to eventually input a matrix of ID, and Delta to return wall thickness (Ha) for various sizes.

Thank You, and sorry for being a Noob.

[MJG · Accepted solution]

Make R, Rlo, Et, and Es functions of Ha, Rl, and σ:

Then, adjust your system of equations to reference these functions:

You end up with this solution:

Does that match what you expected?  It's unclear to me what you want as the final answer.

[felder]

Perfect! thank You!

I was looking to get a calculated P`` that matched my design collapse pressure.