rding to the stationarity conditions of the functional on the right-hand side of (15): (19) − d i v y C y : E + K : y + u ~ ( y ) ⊗ ∇ y = 0 u ~ ( y ) Y - p e r i o d i c Since second-gradient media are sensitive to the gradient of the deformation field, the choice of spatial reference frame becomes highly significant.
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Wave Propagation Analysis in the Homogenized Second-Gradient Medium: A Direct and Inverse Approach.
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