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The actual deformed shape of a rectangular region D referred to the undeformed configuration. (a) Single localized in-plane folding is formed in a couple-stress material at the failure of (E) (α=0.5, ε=0.5, δ=0.2, β=0). The folding angle φ varies with the distance from the point of application of the concentrated force. (b) The underlying classical Cauchy material (α=0.5, ε=0.5, δ=0.2) shows a diffused, mild, bending. (Online version in colour.)
