There is no stress in the x-axis direction on the inner surface.
Stress is caused by pressure and pressure is a parameter that measures how much force is applied to surface area. The direction of a force, in this case, is caused by gravitational force which has a y-axis direction. It means that there is no force applied to the other direction (x-axis) and tends to no pressure or stress applied to the x-axis.
What is Pressure?
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. It can be determined by
P = F / A
where P is pressure, F is force and A is surface area.
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