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Theoretical studies show that the effect of internal pressure on the buckling of thin-walled circular cylinders under axial compression depends on the dimensionless parameter p = (p/E) (R/t) 2 where p is the internal pressure, E the modulus of elasticity, R the cylinder radius, and t the wall thickness of the cylinder. The theoretical treatment of Lo indicates that the critical buckling stress should increase with increasing values of p up to a value of p t3 0.169, after which the buckling stress remains constant at a value equal to that given by the small deflection theory. Since previous experimental data were limited to values of p less than 0.10, additional experimental data were obtained up to p & 2.0 to check the theoretical values. The present tests show that Lo's theory, with certain significant modifications in interpretation, is in fair agreement with the experimental results. A proposed design method is presented which, it is believed, will give conservative values for the buckling stress of such cylinders.A series of photographs showing the variation of the buckling pattern with the internal pressure is one of the most interesting features revealed by the present series of experiments. SYMBOLS E K L P V PB P -1 cr R t O'er O'er *cr0 Ad-cr = = = = = = = = = = = = =Young's modulus, psi another conventional symbol for a cr length of cylinder, in. internal pressure, psi nondimensional internal pressure = (p/E)(R/t) pressure in loading bellows, psi total compressive load at buckling, lbs. radius of cylinder, in. cylinder wall thickness, in. critical compressive stress at buckling, psi nondimensional buckling stress = (o-cr /E)(R/t) KQ -value of d-cr at zero internal pressure O'er O'er

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