.. _R5.03.80:

**r5.03.80** Load control methods
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**Summary:**

This document describes the load control methods available in *Code_Aster* (by a degree of freedom, by arc length, by deformation increment, and by elastic prediction). They introduce an additional unknown, the intensity of the controllable part of the load, and an additional equation, the control constraint. In particular, these methods make it possible to calculate the response of a structure that would present instabilities, both geometric (buckling) and material (softening).


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    Introduction
    Principe_des_m_thodes_de_pilotage_du_chargement
    R_solution_du_syst_me_global
    _quation_de_contr_le_du_pilotage
    Bibliographie
    Description_des_versions_du_document