Large deformations in mechanics

Lecture
Lecturer: Michel Frémond, Dipt. Ingegneria Civile, Univ. Roma II Tor Vergata
Date: April 13, 2011 (Wednesday), 10:00
Location: Institute of Thermomechanics AS CR, v. v. i., Dolejškova 5, Prague, lecture room A

Large deformations of a solid are investigated. We use a polar decomposition of gradient matrix F = RW (R is rotation matrix, W is stretch matrix). Large deformations of solids involve local spacial interactions either in an extension or in a rotation. Because local interactions are well described by spacial gradient, matrix W intervene for extensions and matrix gradR intervene for rotations. Thus the free energy depends on W and on gradR. Moreover, free energy takes into account the local impenetrability condition. Reactions to this impenetrability condition are important in constitutive laws.

Within our parti-pris, self contact and extreme behaviours like the flattening (for example, structure flattened by a power hammer evolving from dimension 3 to dimension 2) are accounted for.


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