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Ballooning (deflection due to pressure)

Ballooning (deflection due to pressure)

Ballooning (deflection due to pressure)

(OP)
Can someone lead me in the right direction of how to calculate the diametral enlargement (ballooning) of a thin walled piece due to the effects of pressure.

RE: Ballooning (deflection due to pressure)

Look in "Roark's Formulas for Stress & Strain," by Warren C. Young.

RE: Ballooning (deflection due to pressure)

For elastic action, the hoop stress is P/(Rt), where P is internal pressure, R is radius, t is wall thickness.  Calculate hoop strain from strain = stress/E, and calculate change in radius = strain x Radius.

This is the uniform radial enlargement due to pressure.  I wouldn't call it "ballooning" as when that happens in a balloon, it is highly non-linear.  I doubt Formulas For Stress and Strain covers the inelastic case, as that would be dependent upon the stress-strain curve.

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