An Alternative Approach for Inelastic Static Isogeometric Analysis and 3D Design with Advanced Spline Techniques with Geomiso TNL: a New Hybrid Cloud-based CAD/CAE Software

The recently developed cloud-based platform www.geomiso.cloud is introduced to help engineers and industries make effective use of inelastic static isogeometric analysis and design with advanced spline techniques. The new Geomiso TNL software combines IGA and cloud computing, one of the fastest growing fields in IT industry. Cloud-based IGA represents the future of product engineering, soon to become an industry standard. This program fully integrates the industrial design with its computational real-time testing, while it is seen to handle demanding inelastic applications in structural mechanics remarkably well, as the numerical examples exhibit significantly improved accuracy with shortened computational time. It is argued that Geomiso TNL is a new, more efficient, alternative to FEA software packages. This is the first time ever such a cloud-based program has been developed

A Comparison Study between Isogeometric Analysis and Finite Element Analysis for Nonlinear Inelastic Dynamic Problems with Geomiso DNL Software

The new Geomiso DNL software is proposed to facilitate the use of isogeometric analysis for nonlinear inelastic dynamic applications. This hybrid software solution combines isogeometric analysis and 3D design with advanced spline techniques, such as NURBS and Tsplines. Its dual nature satisfies the rising industrial need for unification of the fields of computer-aided design (CAD) and computer-aided analysis (CAE), as it eliminates geometric errors by merging geometry design with mesh generation into a single procedure. This paper presents sample nonlinear applications in structural dynamics. Geomiso DNL is seen to handle these situations remarkably well, as the numerical examples exhibit significantly improved accuracy of the results, and reduced computational cost, when compared with finite element software packages. It is argued that Geomiso DNL is a new, more efficient, alternative to FEA software packages. This is the first time ever such a cloud-based program has been developed

Isogeometric analysis of industry applications with Geomiso SEA: a new hybrid software for shell analysis

In this paper the new Geomiso SEA software (www.geomiso.com) is proposed for applications on inelastic static isogeometric analysis with shell elements. This hybrid program is applicable to real world structures, while it satisfies the rising need for technical software of dual CAD/CAA nature. It is based on the new isogeometric method, which has attracted a lot of attention for solving boundary value problems. T-spline-based isogeometric shell analysis efficiently handles multi-patch geometries. Geomiso SEA is not just a plug-in, but a complete software solution, used to simulate spline models of structures or machine components, for analyzing their strength and behavior. The utilization of the exact mesh for analysis vanishes geometric errors, while there is no need of repeating the geometry design for refinement purposes. Industry applications on both thick and thin shells are demonstrated with a comparison between Geomiso SEA and FEA programs. This unique solution for seamless integration of the industrial design of shell geometries with its computational realtime testing, appears to be preferable to FEA programs, representing major improvements, such as higher accuracy, and considerably reduced computational cost

Refinement techniques for spline spaces with cloud-based geomiso TNL software

Geomiso TNL is a new both on-premises and cloud-based software, which delivers isogeometric analysis (IGA) and 3D design with splines. It combines IGA and cloud computing, one of the fastest growing fields in IT industry. The combination of cloud computing and advanced refinement techniques constitutes a real game changer in CAD/CAE fields. Cloud-based IGA represents the future of product engineering, soon to become an industry standard. Automatic mesh refinement has not been widely adopted in industry, because it requires access to the exact geometry. This hybrid program achieves seamless and automatic communication with CAD, thus mesh refinement utilizes the exact geometry, while cloud computing enables users to execute large-scale simulation experiments without the need for dedicated hardware. The recently developed cloud-based platform www.geomiso.cloud is introduced to help engineers and industries make effective use of inelastic static isogeometric analysis and design with advanced spline techniques. It is argued that Geomiso TNL is a new, more efficient, alternative to FEA software packages. This is the first time ever such a cloud-based program has been developed

Modeling and Analysis of Real World and Industry Applications with Geomiso SEA: a New Hybrid CAD/CAE Software for Inelastic Static Isogeometric Shell Analysis and 3D Design with Advanced Spline Techniques

In this paper, the new Geomiso SEA software (www.geomiso.com) is proposed for inelastic static isogeometric analysis with shell elements and splines. Geomiso SEA offers an innovative way to merge geometric design with mesh generation, by creating, with its modern user interface, 3D models as tensor product grids. The utilization of the exact mesh for analysis eliminates geometric errors, while there is no need of repeating the geometry design for refinement purposes. In contrast, the standard finite element technique, not only cannot fully utilize the available data ofthe exact mesh, but also makes engineers unable to benefit from advanced spline techniques. Real world and industry applications on both thick (Mindlin-Reissner) and thin (Kirchhoff­Love) shells are demonstrated with a comparison between Geomiso SEA and FEA programs with shell and hexahedral elements

Isogeometric representations for digital twins subjected to dynamic excitations with GEOMISO DNL software

The new Geomiso DNL software is proposed to facilitate the use of isogeometric analysis for nonlinear inelastic dynamic applications. This hybrid software solution combines isogeometric analysis and 3D design with advanced spline techniques, such as NURBS and Tsplines. Its dual nature satisfies the rising industrial need for unification of the fields of computer-aided design (CAD) and computer-aided analysis (CAE), as it eliminates geometric errors by merging geometry design with mesh generation into a single procedure. This paper presents sample nonlinear applications in structural dynamics. Geomiso DNL is seen to handle these situations remarkably well, as the numerical examples exhibit significantly improved accuracy of the results, and reduced computational cost, when compared with finite element software packages. Geomiso DNL is not just a plug-in, but a both on-premises and cloud-based software, which enables engineers to simulate complex dynamic phenomena, whose impact on industrial products and structures in real-world environments can be more efficiently estimated. Taking advantage of the new horizons offered in the peak of the Industry 4.0 era, the physical twin feeds, via cloud technology, with real-time data its geometrically exact digital twin, while a dynamic analysis is performed and crucial results about structure safety and quality are obtained. It is argued that Geomiso DNL is a new, more efficient, alternative to FEA software. This is the first time ever such a cloud-based program has been developed

Modeling and Analysis of Real World and Industry Applications with Geomiso ISA: Α New Hybrid CAD/CAE Software for Static Isogeometric Analysis with Plate Elements and Advanced Spline Techniques

In this paper, we propose Geomiso ISA (www.geomiso.com), a new hybrid software for applications on static isogeometric analysis with plate elements. It is based on the IGA, the powerful generalization of the traditional FEA, which, in combination with the plate theory, has attracted increasing attention in construction industry over the last decade, as it achieves efficient design-through-analysis procedures and shows superior performance. This recently developed program is not just a plug-in, but a both on-premises and cloud-based software solution, applicable to thin (Kirchhoff-Love) and thick (Mindlin-Reissner) plates. It is used to simulate spline models of slabs and analyze their strength and behavior, while it has many features in common with both FEA software and design programs. This software solution addresses the rising industrial need for seamless integration of CAD and CAE, while it appears to be more efficient to FEA software packages with major improvements, as it facilitates the geometry modeling within analysis, and achieves superior accuracy per degreeof-freedom with shortened computational cost. This is the first time ever such a cloud-based program has been developed

Geomiso ISA: a hybrid software for isogeometric analysis with plate elements and advanced spline techniques

In this paper, we propose the Geomiso ISA program (www.geomiso.com), a new hybrid software for applications on static isogeometric analysis with plate elements. It is based on the isogeometric analysis, the powerful generalization of the traditional finite element analysis, which, in combination with the plate theory, has attracted increasing attention in construction industry over the last decade, as it achieves efficient design-throughanalysis procedures and shows superior performance. This recently developed program is not just a plug-in, but a both on-premises and cloud-based software solution, applicable to thin (Kirchhoff-Love theory) and thick (Mindlin-Reissner theory) plates. It is used to simulate spline models of slabs and analyze their strength and behavior, while it has many features in common with both finite element software and design programs. This new software solution addresses the rising industrial need for seamless integration of computer-aided design and computer-aided analysis, while it appears to be more efficient to finite element software packages with major improvements, as it facilitates the geometry modeling within analysis, and achieves superior accuracy per degree-of-freedom with shortened computational cost. This is the first time ever such a both on-premises and cloud-based software package has been developed

Ανελαστική στατική ανάλυση πλαισιακών φορέων από οπλισμένο σκυρόδεμα με τη μέθοδο των μη γραμμικών πεπερασμένων στοιχείων

293 σ.Στη συγκεκριμένη διπλωματική εργασία θα παρουσιάσουμε τη λεπτομερή προσομοίωση με πεπερασμένα στοιχεία φορέων από οπλισμένο σκυρόδεμα, μέσω της οποίας θα αποτιμήσουμε τη μη γραμμική στατική τους συμπεριφορά. Η προτεινόμενη προσομοίωση κατορθώνει να υπερνικήσει περιορισμούς και μειονεκτήματα παλαιότερων μοντέλων αναφορικά με την ακρίβεια και την υπολογιστική αποδοτικότητα. Το σκυρόδεμα διακριτοποιείται με ισοπαραμετρικά εξαεδρικά οκτακομβικά στοιχεία. Οι ενσωματωμένοι ράβδοι οπλισμού μπορούν να έχουν οποιοδήποτε προσανατολισμό εντός του εσωτερικού των συμπαγών πεπερασμένων στοιχείων του σκυροδέματος, επιτρέποντας την προσομοίωση τόσο διαμήκων όσο και διατμητικών οπλισμών (συνδετήρων). Η ρηγμάτωση του σκυροδέματος αντιμετωπίζεται με τη μέθοδο της διανεμημένης ρωγμής, ενώ οι ράβδοι οπλισμού προσομοιώνονται με φυσικά στοιχεία δυνάμεων, τα οποία συνδυάζουν τη μέθοδο των φυσικών μορφών με τη μέθοδο των ινών και έχουν το πλεονέκτημα να λαμβάνουν υπόψιν πέραν της αξονικής τόσο την καμπτική όσο και τη διατμητική στιβαρότητα των ράβδων οπλισμού, καθώς επίσης και τη σχετική τους ολίσθηση με το σκυρόδεμα. Η απόδοση και η αριθμητική ευρωστία του προτεινόμενου κώδικα ReConAn, ο οποίος έχει αναπτυχθεί σε γλώσσα προγραμματισμού fortran 95, επιδεικνύεται μέσω της σύγκρισης των αριθμητικών αποτελεσμάτων με τα αντίστοιχα πειραματικά τα οποία υπάρχουν στη διεθνή αλληλογραφία. Τα συμπεράσματα, που εξήχθησαν από τη σύγκριση αυτή, αποδεικνύουν ότι η προτεινόμενη αυτή εξελιγμένη προσομοίωση προβλέπει όχι μόνο με ικανοποιητική ακρίβεια αλλά και γρήγορα τη στατική μη γραμμική ανελαστική συμπεριφορά πλαισιακών κατασκευών από οπλισμένο σκυρόδεμα, επιτυγχάνοντας ικανοποιητική ακρίβεια και υπολογιστική αποδοτικότητα.In this thesis we present and propose a detailed finite element modeling for the simulation of the nonlinear behavior of reinforced concrete structures which overcomes limitations of previous models regarding accuracy and computational efficiency. The proposed modeling method uses 8- node hexahedral isoparametric elements for the discretization of concrete. Steel rebars may have any orientation inside the solid concrete elements allowing the simulation of longitudinal as well as transverse reinforcement. Concrete cracking is treated with the smeared crack approach, while steel reinforcement is modeled with the natural beam-column flexibility-based element that is based on the natural mode method and the fiber approach and takes into consideration bending and shear stiffness, as well as slippage with concrete. The numerical results came from the proposed code of finite elements ReConAn_Academic, which was developed in language fortran 95. The performance of the proposed modeling is demonstrated by comparing the numerical predictions with existing experimental results in the literature. The results show that the proposed refined simulation predicts accurately the static nonlinear inelastic behavior of reinforced concrete structures achieving numerical robustness and computational efficiency.Παναγιώτης Καρακίτσιο

Isogeometric Analysis with B-SPLines and NURBS

Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) "Δομοστατικός Σχεδιασμός και Ανάλυση των Κατασκευών"175 σ.Πρωταρχικός σκοπός της μεταπτυχιακής μου εργασίας είναι να παρουσιάσω και να προτείνω τη μέθoδο της ισογεωμετρικής ανάλυσης, η οποία αναπτύχθηκε πρόσφατα προκειμένου να καλύψει το τεράστιο κενό μεταξύ της ανάλυσης με πεπερασμένα στοιχεία και των σχεδιαστικών προγραμμάτων CAD.My thesis' primary goal is to introduce isogeometric analysis. The development of this method was motivated by the existing gap between the worlds of finite element analysis and computer aided design, so its initial purpose is to unify the fields of FEA and CAD.Παναγιώτης Λ. Καρακίτσιο