Abstract
The simplest theory of spatial rods is presented in a variational setting and certain necessary conditions for minimizers of the potential energy are derived. These include the Weierstrass and Legendre inequalities, which require that the vector describing curvature and twist belong to a domain of convexity of the strain energy function.
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Steigmann, D.J., Faulkner, M.G. Variational theory for spatial rods. J Elasticity 33, 1–26 (1993). https://doi.org/10.1007/BF00042633
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DOI: https://doi.org/10.1007/BF00042633