Abstract
This paper presents a brief survey and a unified approach to the complementary-dual variational extremum principles in nonconvex finite deformation theory. By using an abstract deformation operator and its tangent decomposition, the well-known classical complementary energy principles can be written in a general form, and their extremum properties are clarified. Based on a new pure complementary energy principle (involving the stress only), it is shown that the nonlinear equilibrium equation in finite deformation problems can be transformed into a tensor equation. Hence a general analytic solution for 3-dimensional large deformation problems can be constructed. The properties of this general solution are characterized by a triality extremum principle.
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Gao, D.Y. (2001). Duality in Nonconvex Finite Deformation Theory: A Survey and Unified Approach. In: Gilbert, R.P., Panagiotopoulos, P.D., Pardalos, P.M. (eds) From Convexity to Nonconvexity. Nonconvex Optimization and Its Applications, vol 55. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0287-2_6
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DOI: https://doi.org/10.1007/978-1-4613-0287-2_6
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