Elastoplasticity Theory (Mechanical and Aerospace by Vlado A. Lubarda

By Vlado A. Lubarda

Realizing the elastoplastic deformation of metals and geomaterials, together with the constitutive description of the fabrics and research of constitution present process plastic deformation, is a necessary a part of the history required by way of mechanical, civil, and geotechnical engineers in addition to fabrics scientists. in spite of the fact that, so much books deal with the topic at a introductory point and in the infinitesimal pressure context.

Elastoplasticity thought takes a special procedure in a sophisticated therapy awarded solely in the framework of finite deformation. This entire, self-contained textual content comprises an advent to nonlinear continuum mechanics and nonlinear elasticity. as well as in-depth research of the mathematical and actual theories of plasticity, it furnishes an updated examine modern issues, equivalent to plastic balance and localization, monocrystalline plasticity, micro-to-macro transition, and polycrysalline plasticity models.

Elastoplasticity idea displays fresh developments and advances made within the thought of plasticity over the past 4 a long time. it's going to not just aid stimulate additional study within the box, yet will allow its readers to expectantly choose the precise constitutive versions for the fabrics or structural contributors proper to their very own purposes.

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If there are three distinct principal stretches, C and B have the spectral representations 3 3 λ2i Ni ⊗ Ni , C= i=1 λ2i ni ⊗ ni . 2. Schematic representation of the polar decomposition of deformation gradient. Material element is first stretched by U and then rotated by R, or first rotated by R and then stretched by V. The principal directions of U are Ni , and those of V are ni = R · Ni . 11) i=1 and 3 λi ni ⊗ Ni . 13) are the principal invariants of U, then (Hoger and Carlson, 1984; Simo and Hughes, 1998) U= 1 C2 − (j12 + j2 )C − j3 j1 I0 , j1 j2 + j3 U−1 = 1 C − j1 U − j2 I0 .

1), there follows • V · V−1 D= • W = ω + V · V−1 , . 3) a Similarly, if the decomposition F = R · U is used, we obtain ˙ · U−1 · RT . 6) are the tensors induced from L and ω by the rotation R. Upon taking symmetric and antisymmetric parts of Eq. 5), ˆ = U ˙ · U−1 D ˆ =ω ˙ · U−1 ˆ+ U W , s . 7) a Since V = R · U · RT , we also have • ˙ · RT . 8) • ˙ = 0, then V = 0 and In particular, if U ˙ · R−1 . 9) With these preliminaries, we now derive a relationship between W and ˆ and ω). 10) which can be rewritten as • • V−1 · V · V−1 + V · V−1 a · V−1 = D · V−1 − V−1 · D.

12) −1 , where J1 = tr V−1 , K1 = tr J1 I − V−1 −1 . 13) Substitution of Eq. 12) into the second of Eq. 14) , which shows that the spin ω can be determined at each stage of deformation solely in terms of V, D, and W. 15) . Substitution into second of Eq. 16) , as anticipated at the outset from its duality with Eq. 14). Additional kinematic analysis is provided by Mehrabadi and Nemat-Nasser (1987), and Reinhardt and Dubey (1996). 8. Rate of F in Terms of Principal Stretches From Eq. 11) the right stretch tensor can be expressed in terms of its eigenvalues – principal stretches λi (assumed here to be different), and corresponding eigendirections Ni as 3 λi Ni ⊗ Ni .

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