Plastic Strength of Perforated Plates With Square Penetration Patterns

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Abstract
The sheet perforated with circular holes arranged in a square penetration pattern anp subjected to in-plane biaxial stress is investigated. Discontinuous fields of stress are used to obtain the lower-bound limit loads for the perforated material. The yield surfaces for the equivalent solid material are then derived and the effective plastic constants are given for the entire range of ligament efficiencies used in design.

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