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Dimensionless level sets of the von Mises stress ℓσe due to a concentrated unit force. Approaching the limit of (E) loss, the stress channels into: (a) a band of finitethickness (of width 6ℓ) for a couple-stress material (α=0.5, ε=10−9, δ=0.2, β=10−9) and (b) a band of null thickness for a classical Cauchy material (α=0.5, ε=10−9, δ=0.2). (Online version in colour.)
