科研之友
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摘要
Cylindrical shells generally fail by buckling under vacuum or external pressure. Traditional methods include installing stiffening rings or increasing the thickness of the shells to increase the buckling pressure. A novel method is proposed herein to increase the buckling pressure temporarily using clamped arrestors for cylindrical shells. An experimental setup was designed to study the enhancing efficiency of clamped arrestors used in cylindrical shells under external pressures. The experimental setup comprises primarily the pressure gauge, pressure cylinder, and single-piston manual pump. The critical buckling pressure was recorded automatically by the pressure gauge during test. The experimental results indicate that the clamped arrestor could effectively increase the critical buckling pressure of the cylindrical shells when the cylindrical shells became short cylindrical shells after the clamped arrestor was used. The enhancing efficiency increased with decreasing length-to-outer-diameter ratio, increasing Young's modulus of the cylindrical shells, and the closer position of the clamped arrestors to the center of the cylindrical shells. In addition, an equation was also used to estimate the critical buckling pressure of the short cylindrical shells with different numbers of clamped arrestors under external pressures.
