Linear models of dissipation in anelastic solids
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...Subsequently, in 1971, Caputo & Mainardi [28] have proved that the Mittag-Leffler function is present whenever derivatives of fractional order are introduced in the constitutive equations of a linear viscoelastic body....
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...We now observe that an alternative definition of fractional derivative, originally introduced by Caputo [19], [27] in the late sixties and adopted by Caputo and Mainardi [28] in the framework of the theory of Linear Viscoelasticity (see a review in [24]), is the so-called Caputo Fractional Derivative of order α > 0 : D ∗ f(t) := J D f(t) with m− 1 < α ≤ m, namely...
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...We now observe that an alternative definition of fractional derivative, originally introduced by Caputo [19], [27] in the late sixties and adopted by Caputo and Mainardi [28] in the framework of the theory of Linear Viscoelasticity (see a review in [24]), is the so-called Caputo Fractional Derivative of order α > 0 : Dα∗ f(t) := J m−αDm f(t) with m− 1 α ≤ m, namely Dα∗ f(t) := 1 Γ(m− α) ∫ t 0 f (m)(τ) (t− τ)α+1−m dτ , m− 1 α m , dm dtm f(t) , α = m. (1.17) This definition is of course more restrictive than (1.13), in that requires the absolute integrability of the derivative of order m....
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...Fractional relaxation is overall a peculiarity of a class of viscoelastic bodies which are extensively treated by Mainardi [24], to which we refer for details and additional bibliography....
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...In this respect A. Carpinteri and F. Mainardi have edited the present book of lecture notes and entitled it as Fractals and Fractional Calculus in Continuum Mechanics....
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