A photoelastic investigation of the elastic–plastic strain distribution around slits in various thin plate metal materials

Abstract

An investigation of the elastic–plastic strain distribution around slits has been made using the photoelastic coating technique. Four different specimens were fabricated from thin metal plates. The specimens differ in slit type and length. The experimental results reveal a general picture of strain distribution around slits under various circumstances and show the influence of slit type, slit length, load level, loading history, etc., on strain distribution. The results agree with Inglis' theoretical elastic solution at low load levels and with Hutchinson's theoretical plastic solution at high load levels. Non-symmetrical isochromatic fringe patterns were obtained in annealed B3 thin steel plate specimens.

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