ADINA Struktur
Die ADINA Software bietet modernste Fähigkeiten für lineare und nichtlineare Spannungsanalysen von Volumen (2D und 3D Analysen) und Strukturen. Die Analysen können dabei linear oder stark nichtlinear sein und Effekte von Materialnichtlinearitäten, großen Verformungen und unterschiedliche Kontaktbedingungen beinhalten.
Das ADINA Programm bietet verschiedenste und allgemein anwendbare Elemente für Volumen, Träger, Balken, Rohre, Platten, Schalen und Spalte. Es sind Materialmodelle für Metalle, Erdreich und Gestein, Kunststoffe, Gummi, Gewebe, Holz, Keramik und Beton verfügbar.
Stabilität von Gummimaterialmodellen
Das Gummibauteil in diesem Beispiel wurde mit unterschiedlichen Materialmodellen berechnet. Es zeigt sich, daß die Analyse nicht konvergiert, wenn ein Materialmodell mit negativem Stabilitätsindikator verwendet wird. Die Stabilitätscharakteristika von Gummimaterialmodellen können mit Hilfe der neuen Stabilitätsanzeige ab ADINA 8.5.1 dargestellt werden.
Elastisch-plastische Versagensanalyse eines Rohres bei großen Verformungen
Die Versagensanalyse eines Rohres ist in einer Vielzahl von industriellen Bereichen wichtig, namentlich in der offshore Öl- und Gasgewinnung. Solche Simulationen sind im Allgemeinen schwierig, da das Verhalten des Rohres bei großen Knotenverschiebungen/Dehnungen und das elastisch-plastische Materialverhalten bei großen Dehnungen sehr genau modelliert werden müssen. Die Berechnung muss verlässliche und exakte Ergebnisse erzielen, da vom vorhergesagten Verhalten viele wichtige konstruktive Entscheidungen abhängen ....
2-D Multi-body Contact Example Solved Using Explicit Time Integration
ADINA 8.3 will have significantly more powerful explicit dynamic solution capabilities. These will be very useful for certain types of dynamic simulations, like crash analyses. The improvements in ADINA 8.3 pertain to the contact analysis capabilities, frictional effects, automatic time step selections, and parallel processing. All these capabilities are provided within the "ADINA philosophy" of only ....
ADINA Substructuring in Analyses with Local Nonlinearities
The ADINA substructuring capability can be very efficient when the analysis involves only local nonlinearities; for the theory used, see references given below. Here we present two examples of the use of substructuring. The first example pertains to a metal forming problem in which elastic upper rollers are pushed down to deform a sheet that rests on elastic lower rollers, see ....
Analysis of an Artery Using the ADINA Orthotropic Rubber Model
The new orthotropic rubber model of ADINA 8.2 can be used in the analysis of biomechanical materials. As a demonstration, we analyze the axial extension and inflation of the carotid artery of a rabbit. Our analysis is based on the paper, A New Constitutive Framework for Arterial Wall Mechanics and a Comparative Study of Material Models, by Holzapfel, Gasser and Ogden, from Journal of Elasticity Vol. 61 (2000), ....
New Contact Solution Options in ADINA
There are two new important features for contact analysis in ADINA that we want to briefly illustrate here. These are the gap-override option and the materially-nonlinear-only (MNO) analysis option. In the MNO analysis option, the contact solution is performed with no geometric nonlinearities in the contact search and in the enforcement of the contact conditions the nonlinearity is ....
Cyclic Symmetry Analysis
ADINA 8.1 has several enhancements to its cyclic symmetry analysis capabilities. The sparse and iterative solvers can now be used to solve cyclic problems. The primary cyclic component is no longer required to be aligned with the X-Y plane, and the axis of cyclic symmetry can have any orientation in space ....
Effective Meshes using the Size Function Option
In many problems, it is very important to be able to mesh densely in certain areas and more coarsely in other areas like in the analysis of the helmet above, where the contact area requires a fine mesh. ADINA 8.4 has powerful capabilities to achieve mesh gradation, in particular when ADINA-M is used. Here we feature the ....
Two Interesting Examples of Mesh Glueing
The mesh glueing feature in ADINA is a practical and powerful technique suitable for many types of analyses. It was introduced in ADINA 8.3 and has been extensively used. The feature was already described in a previous News, in which we focused on the use of a fine mesh in a certain region and successively coarser meshes elsewhere (as used, for example, in a multi-scale analysis ....
Explicit Analysis with Distributed Memory Processing
Distributed Memory Processing (DMP) will be available for dynamic explicit analysis in ADINA 8.5. The calculations of element forces, displacements and contact conditions are all distributed to the multiple processors according to the computing domains. This leads to significant reductions in solution time and memory requirements compared to a single domain, single processor run. Of course, the results are independent of the number of processors/domains used. ....
Frequency and Transient Solutions with Mesh Glueing
To demonstrate the use of mesh glueing in frequency and mode superposition solutions, we consider the mechanical arm already analyzed in our January 15 News. Recall that the arm was modeled using four parts glued together. Each part was meshed independently and the meshes are not compatible. The movies given above and at the right show the vibration ....
Analysis of a Transmission Model Including Contact Using the Iterative Solver
We present another application of the powerful iterative solver in ADINA for structural solutions that can include large deformations, plasticity and contact. In the News of Apr. 30, 2006, we described when this solver is most useful, and illustrated its application with two examples. Our application now is the analysis of a transmission. The model is shown below, followed by the analysis statistics. ....
Glueing of Regions with Dissimilar Meshes
In a finite element model, it may be desirable to create a fine mesh on a certain region and successively coarser meshes elsewhere (for example, in a multi-scale analysis). In other cases, some regions may be meshed with free-form tetrahedral elements while other regions are meshed with brick elements. It is often a challenge to connect these regions with dissimilar meshes together. ....