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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク strain energy density function ： ウィキペディア英語版 strain energy density function A strain energy density function or stored energy density function is a scalar valued function that relates the strain energy density of a material to the deformation gradient. :$$ W = \hat(\boldsymbol) = \hat(\boldsymbol^T\cdot\boldsymbol) =\bar(\boldsymbol) = \bar(\boldsymbol^\cdot\boldsymbol)=\tilde(\boldsymbol,\boldsymbol) Equivalently, :$$ W = \hat(\boldsymbol) = \hat(\boldsymbol^T\cdot\boldsymbol\cdot\boldsymbol) =\tilde(\boldsymbol,\boldsymbol) where $\backslash boldsymbol$ is the (two-point) deformation gradient tensor, $\backslash boldsymbol$ is the right Cauchy-Green deformation tensor, $\backslash boldsymbol$ is the left Cauchy-Green deformation tensor, and $\backslash boldsymbol$ is the rotation tensor from the polar decomposition of $\backslash boldsymbol$. For an anisotropic material, the strain energy density function $\backslash hat(\backslash boldsymbol)$ depends implicitly on reference vectors or tensors (such as the initial orientation of fibers in a composite) that characterize internal material texture. The spatial representation, $\backslash tilde(\backslash boldsymbol,\backslash boldsymbol)$ must further depend explicitly on the polar rotation tensor $\backslash boldsymbol$ to provide sufficient information to convect the reference texture vectors or tensors into the spatial configuration. For an isotropic material, consideration of the principle of material frame indifference leads to the conclusion that the strain energy density function depends only on the invariants of $\backslash boldsymbol$ (or, equivalently, the invariants of $\backslash boldsymbol$ since both have the same eigenvalues). In other words, the strain energy density function can be expressed uniquely in terms of the principal stretches or in terms of the invariants of the left Cauchy-Green deformation tensor or right Cauchy-Green deformation tensor and we have: For isotropic materials, :$$ W = \hat(\lambda_1,\lambda_2,\lambda_3) = \tilde(I_1,I_2,I_3) = \bar(\bar_1,\bar_2,J) = U(I_1^c, I_2^c, I_3^c) with :$$ \begin \bar_1 & = J^~I_1 ~;~~ I_1 = \lambda_1^2 + \lambda_2 ^2+ \lambda_3 ^2 ~;~~ J = \det(\boldsymbol) \\ \bar_2 & = J^~I_2 ~;~~ I_2 = \lambda_1^2 \lambda_2^2 + \lambda_2^2 \lambda_3^2 + \lambda_3^2 \lambda_1^2 \end For linear isotropic materials undergoing small strains, the strain energy density function specializes to :$W\; =\; \backslash frac\backslash sum\_^\backslash sum\_^\backslash sigma\_\backslash epsilon\_\; =\; \backslash frac(\backslash sigma\_x\backslash epsilon\_x+\backslash sigma\_y\backslash epsilon\_y+\backslash sigma\_z\backslash epsilon\_z+\backslash tau\_\backslash gamma\_+\backslash tau\_\backslash gamma\_+\backslash tau\_\backslash gamma\_)$ A strain energy density function is used to define a hyperelastic material by postulating that the stress in the material can be obtained by taking the derivative of $W$ with respect to the strain. For an isotropic, hyperelastic material the function relates the energy stored in an elastic material, and thus the stress-strain relationship, only to the three strain (elongation) components, thus disregarding the deformation history, heat dissipation, stress relaxation etc. For isothermal elastic processes, the strain energy density function relates to the Helmholtz free energy function $\backslash psi$, :$$ W = \rho_0 \psi \;. For isentropic elastic processes, the strain energy density function relates to the internal energy function $u$, :$$ W = \rho_0 u \;. == Examples of strain energy density functions == Some examples of hyperelastic constitutive equations are〔Muhr, A. H. (2005). Modeling the stress-strain behavior of rubber. Rubber chemistry and technology, 78(3), 391-425. ()〕 *Saint Venant–Kirchhoff *Neo-Hookean *Generalized Rivlin *Mooney–Rivlin *Ogden *Yeoh *Arruda–Boyce model *Gent 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「strain energy density function」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.