By Omri Rand;Vladimir Rovenski

* finished textbook/reference applies mathematical tools and glossy symbolic computational tools to anisotropic elasticity * Presents unified method of an enormous variety of structural types * state of the art ideas are supplied for quite a lot of composite fabric configurations, together with: 3-D anisotropic our bodies, 2-D anisotropic plates, laminated and thin-walled constructions

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63b) k=0 In what follows, Km stands for the maximal expansion degree of all analysis components (clearly, the expansion degree of the strain components will be less than those of the displacement components). 53a–c) are also written in levels as fi j = (k) Km fi j (x, y)zk , while ∑k=0 1 (k) 1 (k) 1 (k) (k+1) (k) (k+1) (k) (k) (k+1) fxx = [γxz, y − (k + 1)γxy ], fxy = γyz, y − (k + 1)εy , fxz = εz, y − (k + 1)γyz , 2 2 2 1 (k) 1 1 (k) (k+1) (k) (k+1) (k) (k) (k+1) (k) − γxz, x , fyy = [(k + 1)γxy − γyz, x ], fyz = (k + 1)γxz − εz, x , fyx = (k + 1)εx 2 2 2 1 (k) 1 (k) 1 (k) (k) (k) (k) (k) (k) (k) fzy = εy, x − γxy, y , fzz = (γyz, x − γxz, y ).

32 1. Fundamentals of Anisotropic Elasticity and Analytical Methodologies The notion “extreme values” stands for local minima, maxima or inflection points. e. stationary or time-dependent) of the problem. , in (Sagan, 1969). Two general assumptions are typically associated with the analytical methodologies applied in calculus of variations. First, we generally assume that all functions and functionals are continuous and have continuous derivatives as required. In addition, the functional values are assumed to be positive.

For such a case V= W (u1 , . . 132) where Fs k are surface loading and uk are displacements of the kth point (of the application of the force Fs k ). 123) together with the fact k that the variations δ uk are arbitrary, yield the system Fs k = ∂∂U uk . This result, widely known as Castigliano’s First Theorem, may be interpreted as follows: the partial derivative of the strain energy with respect to generalized displacements is equal to the corresponding generalized force. Note that this result stands for small perturbations, and thus should be applied either to the case of relatively small loads, or to the case where the system is linear in the sense that the resulting displacements vary linearly with the loads (in such a case, U, uk is a linear function of uk ).