Question: A spherical steel pressure vessel (diameter 480 mm, thickness 8.0 mm) is coated with brittle lacquer that cracks when the strain reaches 150 ( 10-6

A spherical steel pressure vessel (diameter 480 mm, thickness 8.0 mm) is coated with brittle lacquer that cracks when the strain reaches 150 ( 10-6 (see figure).
What internal pressure p will cause the lacquer to develop cracks? (Assume E =205 GPa and v = 0.30.)

Cracks in coating

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