# Rotations in computational solid mechanics

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## Summary

A survey of variational principles, which form the basis for computational methods in both continuum mechanics and multi-rigid body dynamics is presented: all of them have the distinguishing feature of making an explicit use of the finite rotation tensor.

A coherent unified treatment is therefore given, ranging from finite elasticity to incremental updated Lagrangean formulations that are suitable for accomodating mechanical nonlinearities of an almost general type, to time-finite elements for dynamic analyses. Selected numerical examples are provided to show the performances of computational techniques relying on these formulations.

Throughout the paper, an attempt is made to keep the mathematical abstraction to a minimum, and to retain conceptual clarity at the expense of brevity. It is hoped that the article is self-contained and easily readable by nonspecialists.

While a part of the article rediscusses some previously published work, many parts of it deal with new results, documented here for the first time.

## Keywords

Variational Principle Rotation Vector Hyperelastic Material Rotation Tensor Corotational Rate## Preview

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