Abstract
The absolute nodal coordinate formulation (ANCF) has been developed for the modeling of large deformation beams in two or three dimensions. The absence of rotational degrees of freedom is the main conceptual difference between the ANCF and classical nonlinear beam finite elements that can be found in literature. In the present approach, an ANCF beam finite element is presented, in which the orientation of the cross section is parameterized by means of slope vectors. Based on these slope vectors, a thickness as well as a shear deformation of the cross section is included. The proposed finite beam element is investigated by an eigenfrequency analysis of a simply supported beam. The high frequencies of thickness modes are of the same magnitude as the shear mode frequencies. Therefore, the thickness modes do not significantly influence the performance of the finite element in dynamical simulations. The lateral buckling of a cantilevered right-angle frame under an end load is investigated in order to show a large deformation example in statics, as well as a dynamic application. A comparison to results provided in the literature reveals that the present element shows accuracy and high order convergence.
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Acknowledgements
K. Nachbagauer and P. Gruber acknowledge support from the Austrian Science Funds (FWF): I337-N18, J. Gerstmayr from the K2-Comet Austrian Center of Competence in Mechatronics (ACCM).
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Nachbagauer, K., Gruber, P., Gerstmayr, J. (2013). A 3D Shear Deformable Finite Element Based on the Absolute Nodal Coordinate Formulation. In: Samin, JC., Fisette, P. (eds) Multibody Dynamics. Computational Methods in Applied Sciences, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5404-1_4
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DOI: https://doi.org/10.1007/978-94-007-5404-1_4
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