Stress Analysis - compound cylinders

[jhmz]

Homework Statement

problem attached

Homework Equations

attached
but lame equations i think they are?

The Attempt at a Solution

attached


Hey
this is an assignment question that i have wasted countless hours on trying to solve without success. The problem is WBVMMECH025 from the anasys 12 verification manual (problem is attached) i have completed the anysys analysis with correct results and now have to do hand calculations, I am sure that the interface pressure is correct, I am sure i am using the right formula to find tangential stresses due to interface pressure and that those answers are correct. I think it is after this where i try to find the tangetial stresses due to the applied internal pressure is where i am going wrong but can't figure out why. have attached a clean copy of my attempt and the excel formulas should be correct cause they match my hand calculations.

all help greatly appreciated

edit: files were too big for attachment so i hosted them externally

The problem
http://www.fileden.com/files/2010/5/6/2850545/problem.doc"

My attempt at the question:
http://www.fileden.com/files/2010/5/6/2850545/my%20attempt.xls"

 

[jhmz]

alll good figured it out