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On the integration of computer aided design and analysis using the finite element absolute nodal coordinate formulation

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Abstract

For almost a decade, the finite element absolute nodal coordinate formulation (ANCF) has been used for both geometry and finite element representations. Because of the ANCF isoparametric property in the cases of beams, plates and shells, ANCF finite elements lend themselves easily to the geometric description of curves and surfaces, as demonstrated in the literature. The ANCF finite elements, therefore, are ideal for what is called isogeometric analysis that aims at the integration of computer aided design and analysis (ICADA), which involves the integration of what is now split into the separate fields of computer aided design (CAD) and computer aided analysis (CAA). The purpose of this investigation is to establish the relationship between the B-spline and NURBS, which are widely used in the geometric modeling, and the ANCF finite elements. It is shown in this study that by using the ANCF finite elements, one can in a straightforward manner obtain the control point representation required for the Bezier, B-spline and NURBS geometry. To this end, a coordinate transformation is used to write the ANCF gradient vectors in terms of control points. Unifying the CAD and CAA will require the use of such coordinate transformations and their inverses in order to transform control points to position vector gradients which are required for the formulation of the element transformations in the case of discontinuities as well as the formulation of the strain measures and the stress forces based on general continuum mechanics theory. In particular, fully parameterized ANCF finite elements can be very powerful in describing curve, surface, and volume geometry, and they can be effectively used to describe discontinuities while maintaining the many ANCF desirable features that include a constant mass matrix, zero Coriolis and centrifugal forces, no restriction on the amount of rotation or deformation within the finite element, ability for straightforward implementation of general constitutive equations, and ability to capture coupled deformation modes that cannot be captured using existing finite element beam, plate and shell formulations. Because of the relationship between the ANCF finite elements and the B-splines, the development of a rational absolute nodal coordinate formulation (RANCF) is currently being explored. Furthermore, the relationship between the ANCF finite elements and B-splines and NURBS demonstrates that the use of B-splines and NURBS in the analysis will eventually lead to the same fundamental issues that have been already researched in the literature on the ANCF finite elements.

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  1. Department of Mechanical Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL, 60607, USA

    Graham G. Sanborn & Ahmed A. Shabana

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  1. Graham G. Sanborn
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  2. Ahmed A. Shabana
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Correspondence to Ahmed A. Shabana.

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Sanborn, G.G., Shabana, A.A. On the integration of computer aided design and analysis using the finite element absolute nodal coordinate formulation. Multibody Syst Dyn 22, 181–197 (2009). https://doi.org/10.1007/s11044-009-9157-3

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  • DOI: https://doi.org/10.1007/s11044-009-9157-3

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