The buckling behavior of a 12.7 in. outside diameter, 0.366 in. thick vessel made of chopped strand mat fiber glass reinforced polyester was investigated. External pressure of up to 105 psi plus additional vacuum was imposed. A subsequent test involving axial load was also examined. Under external pressure, the strain values showed unstable response at 60 psi. Under axial loads, longitudinal ribs formed at 100,000 lbs.
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