IMHO, Bathe's book is just a confusing bundle of notation and arachaic definition. It is definitely only for those who want to study the history of FEA !
I am guessing that 2 years from now NX version will be much better than the MSC version. Louis Komszik, Tom Kowalski et al who were at MSC and later in SAS are now working on NX version.
If you read the first post carefully, it says the sphere is of diameter 36 inches.. Now the moment of inertia of a solid sphere is... (2/5)*m*r^2 and not (1/2)..well the factor in the front is 0.4 instead of 0.5. So maybe you will need even lesser torque.
Also, do you really want to ignore the...
I am guessing you want to know how this error in the strain energy is estimated ? Almost all estimates of error in the strain enery arised from the "residual force" and the "jumps in the tractions across the boundaries of the elements". The residual force arises due to the...