4b. Pressure Vessels (SSES Ch. 4.4) • Cylindrical Pressure Vessels • Spherical Pressure Vessels • Deformation of Pressure Vessels 
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Spherical Pressure Vessels
Due to the 3D symmetry of thinwalled spherical pressure vessels, stress is uniform (the same) throughout. The spherical stress s_{S} is determined by cutting the sphere in half and applying equilibrium:

Spherical Stress FBD. 
Deformation of Pressure Vessels

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