Aluminium plates (7/1 width/thickness ratio) were bent to fracture. Circumferential strain at fracture location (maximum value 0.26) was obtained by special plotting and extrapolation of (millimetre) photo-grid data.
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References
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BrewerG. A.GlasscoR. B.‘Determination of strain distribution by photo-grid process’, J. aeronaut. Sci.19419, 1.
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HartlenR. T.The influence of the sub-surface strain gradient on the initiation of fracture1964 Thesis in mechanical engineering submitted to the University of Toronto for the degree of M.A.Sc.
