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FEXLAWhole-model checksC-01

Buckling and limit-load checks

Eigenvalue buckling with the code's design factors, and plastic collapse by VIII-2 5.2.3, on the model you built.

Where it stops: Linear eigenvalue buckling with design factors. Limit load on the VIII-2 route only, for the modelled part, not the whole vessel.

Line drawing of a thin cylinder with its first buckling mode: lobes round the circumference — Fig. 1 · Line drawing of a thin cylinder with its first buckling mode: lobes round the circumference

Choose a method

The quickest first. Each opens with a first page for the job: units, code edition and which checks to run.

01Buckling: VIII-2 5.4
Buckling analysis
Eigenvalue buckling of your current model only; no stress, fatigue or ratcheting checks.
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02Limit load: VIII-2 5.2.3
Limit-load analysis
VIII-2 5.2.3, elastic-perfectly plastic, small displacement: each Table 5.4 combination passes if equilibrium holds at its factored load. VIII-2 route only; no large-displacement 5.2.4, 5.3.3 local strain or ratcheting yet.
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Use it for

01Thin shells, skirts and cones under axial load, bending or external pressure; vessels with attachments under vacuum.
02A heavily loaded nozzle, lug or trunnion that fails the elastic check by a small margin.
03Junctions where elastic stresses are hard to classify, and shapes with no design-by-rule formula.

In pictures

Fig. 2 · The agitator connection: thrust, torque and bending at the flange
Fig. 3 · The analysis: stress at the connection, worst point marked
Fig. 4 · A skirt access opening, FEA
Fig. 5 · A stress result, VIII-2 Part 5

How it works

Method notes: Specialty analyses Worked examples Quick reference