tailieunhanh - Nonlinear Finite Elements for Continua and Structures Part 8

Tham khảo tài liệu 'nonlinear finite elements for continua and structures part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | and bf C are related it can also be shown that the components of the nominal stress tensor is given by begin equation bf P partial W over partial bf F AT qquad P_ ij partial W over partial F_ ji end equation As the deformation gradient tensor bf F is not necessarily symmetric the 9 components of the nominal stress tensor bf P do not necessarily possess symmetry. Employing Eq. the Cauchy stress tensor mbox boldmath sigma is related to W by begin equation mbox boldmath sigma 1 over J bf F cdot partial W over partial bf F AT 1 over J bf F cdot partial W over partial bf E cdot bf F AT end equation Exercise Show this. noindent bf Modified Mooney-Rivlin Material par In 1951 Rivlin and Saunders published their experimental results on the large elastic deformations of vulcanized rubber - an incompressible homogeneous isotropic elastic solid in the Journal of Phil. Trans. A. Vol. 243 pp. 251-288. This material model with a few refinements is still the most commonly used model for rubber materials. It is assumed in the model that behavior of the material is initially isotropic and path-independent . a stored energy function exists. The stored energy function is written begin equation Psi Psi bf C W I_1 1_2 1_3 end equation where I_1 I_2 and I_3 are the three scalar invariants of bf C . Rivlin and Saunders considered an initially isotropic nonlinear elastic incompressible material I_3 1 then begin equation Psi Psi I_1 I_2 sum_ i 0 A infty sum_ j 0 A infty bar c _ ij I_1-3 Ai I_2-3 Aj qquad bar c _ 00 0 end equation where bar c _ ij are constants. They performed a number of experiments on different types of rubbers and discovered that Eq. may be reduced to begin equation Psi c I_1 - 3 f I_2 - 3 end equation where c is a constant and f is a function of I_2 - 3 . For a Mooney-Rivlin material W can be reduced further to begin equation Psi Psi I_1 I_2 c_1 I_1 - 3 c_2 I_2 - 3 end equation An example of the set of c_1 and c_2 is c_1 rm psi and c_2 rm psi . Equation is

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