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**Variational approaches for dynamics and time-finite-elements: Numerical studies.**
*(English)*
Zbl 0717.73098

Summary: This paper presents general variational formulations for dynamical problems, which are easily implemented numerically. The development presents the relationship between the very general weak formulation arising from linear and angular momentum balance considerations, and well known variational principles. Two and three field mixed forms are developed from the general weak form. The variational principles governing large rotational motions are linearized and implemented in a time finite element framework, with appropriate expressions for the relevant “tangent” operators being derived. In order to demonstrate the validity of the various formulations, the special case of free rigid body motion is considered. The primal formulation is shown to have unstable numerical behavior, while the mixed formulation exhibits physically stable behavior. The formulations presented in this paper form the basis for continuing investigations into constrained dynamical systems and multi-rigid-body systems, which will be reported in subsequent papers.

### MSC:

74S30 | Other numerical methods in solid mechanics (MSC2010) |

74P10 | Optimization of other properties in solid mechanics |

74S05 | Finite element methods applied to problems in solid mechanics |

65K10 | Numerical optimization and variational techniques |

74H45 | Vibrations in dynamical problems in solid mechanics |

### Keywords:

linearization; very general weak formulation; angular momentum balance considerations; Two and three field mixed forms; large rotational motions### Software:

MESA VERDE
Full Text:
DOI

### References:

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