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Profiles of the dimensionless von Mises stress ℓσe due to a concentrated unit force. (a) The progressive localization of the von Mises stress plotted at the level x2=5ℓ, as the ratio β tends to zero and the material approaches failure of (E). (b) The variation of the von Mises stress along the discontinuity line (x1=0) for a couple-stress material at (E) loss (β=0) shows that stress channelling occurs as the shear modulus tends to zero ε. (Online version in colour.)
