Computation of post-yield behaviour in notch-bend and tension testpieces

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Abstract
First results of an analysis of notch-bend pieces in plane strain by two-dimensional elastic-plastic finite-element computations are given. Comparisons are given of load-displacement records for three notch depths and a general non-dimensional presentation proposed. Relations between the values of surface and cracktip crack opening displacement are shown and comparison is made with a few results in plane stress, by Dugdale model and in tension. The trend of local stress and strain patterns is shown and stress triaxiality is evaluated approximately. It is concluded that nearly quantitative agreement can be reached for the general behaviour of notched pieces by the use of fairly simple two-dimensional models but many of the results could be improved by the use of better element meshes. For the study of local crack-tip deformations more detailed models or more powerful means of characterizing the crack tip are required.

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