I have attached a model and i have some questions about my model. I am badly in need of help regarding these question's answers:

1.Here i applied 10 Mpa but on my model it changes to 4.86 Mpa.

2.For my model i am getting the maximum radial stress -128.73 while i applied just 10 Mpa. Is it practically possible? I am not clear about it.The result graph is given below:

3.Another thing i want to know that for my model which equations are solved to get the deformation and radial or hoop stress in Ansys. can anyone help me to understand this properly?

4. I have applied internal pressure 10 Mpa. If i want the thermal stresses for the pressure 0 Mpa that means for the 1100 temperature only then how will i do it