Strong Ellipticity and Infinitesimal Stability within Nth-Order Gradient Elasticity
Mathematics, ISSN: 2227-7390, Vol: 11, Issue: 4
2023
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New Mathematics Study Findings Have Been Reported by a Researcher at University of Cagliari (Strong Ellipticity and Infinitesimal Stability within Nth-Order Gradient Elasticity)
2023 MAR 06 (NewsRx) -- By a News Reporter-Staff News Editor at Math Daily News -- Research findings on mathematics are discussed in a new
Article Description
We formulate a series of strong ellipticity inequalities for equilibrium equations of the gradient elasticity up to the Nth order. Within this model of a continuum, there exists a deformation energy introduced as an objective function of deformation gradients up to the Nth order. As a result, the equilibrium equations constitute a system of (Formula presented.) -order nonlinear partial differential equations (PDEs). Using these inequalities for a boundary-value problem with the Dirichlet boundary conditions, we prove the positive definiteness of the second variation of the functional of the total energy. In other words, we establish sufficient conditions for infinitesimal instability. Here, we restrict ourselves to a particular class of deformations which includes affine deformations.
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