Ansys Vdi 2230
Ina Dottery
Developed by CADFEM and partners and directly integrated into Ansys Workbench, the CADFEM Ansys Extensions selectively extend the functional range of Ansys. With Bolt Assessment inside Ansys you can evaluate all load cases and find critical loads in bolted joints. Calculation and verification is automated, fast and comfortable according to VDI 2230. You can buy Bolt Assessment inside Ansys directly in our shop or request a test!
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I am a new user of Ansys Workbench. Until today I've been using Abaqus to do my simulations tasks combined with HyperMesh to prepare meshes of components to analyse. That's why I am asking you if there is any way to model bolts following VDI 2230, considering the distances of the image below. Previously I had a lot of freedom to place nodes where I wanted.
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The most commonly and most detailled internationally accepted Guideline for bolt calculation is VDI2230. It has been implemented in KISSsoft Software for some time and is now also available inside ANSYS! Means: bolt Forces are calculated inside an FEM model, taking into account the resilience of all parts. Bolt loads are then exported to KISSsoft, where the strength Rating is done along VDI2230.
I'm analyzing flanged bolted connections and I am confused whether the extracted moment reaction should be included, that is if bolts can carry bending stress Mc/I and if it should be added along with the tensile stress F/A. If so, what are the cases that it should be considered? Can someone shed light on this please? Thanks!
Why do you want to include the extracted moment reaction? I am assuming that you are talking about the moment reactions extracted after the simulation. If this is the case then it will increase the load unnecessarily.
Thanks for your reply! Well, the reason is to add up the bending stress. When I insert the Normal stress on a surface perpendicular to the cross section of the bolt, I can clearly see three regions (compression, average, tension) implying that there is bending stress, right? Also, I'm curious why you say it will unnecessarily increase the load? Is the moment resolved in terms of the reaction force? How is that moment reaction calculated?
As far as I understand, since the stiffness of the flange is much higher than that of the bolt, it will absorb most of this moment, that's why VDI 2230 does not include it. However, there is a bending stress contribution according to this study.
If you look at page 81 section title "5.4.9 S8: Extract Values from the FE-analysis" it says "Note that when extracting forces and moments from surfaces, the nodal forces for that surface are summarized. This is a potential source of error" What do they mean by summarized? Thanks!
Hi Omar, we are not allowed to download attachments. Can you please share the relevant snapshot? My thought was that you extract the moment reaction and then reapply the same in the analysis. But it looks like bending is taking place in the bolt along with the pretension. In reality we bolt parts together first. Based on this thought you can preload the bolt, lock it and then apply the bending load.
Dodatek ACT przeprowadza automatyczną ocenę śrub w oparciu o wytyczne z normy VDI 2230 dla wszystkich wybranych śrub w konstrukcji. Moduł w obecnej wersji wspłpracuje ze śrubami zamodelowanymi jako bryły 3D oraz belki 1D, odpowiadające modelowi III i II klasy, opisane w normie VDI 2230 Part II. Podczas rozwiązywania zagadnienia, wyniki symulacji MES i parametry wejściowe zdefiniowane w dodatku ACT są przekazywane do zewnętrznego solvera opracowanego przez firmę KISSsoft, ktry oblicza wspłczynniki bezpieczeństwa niezbędne do oceny śrub. Te wspłczynniki są bezpośrednio wyświetlane w ANSYS Mechanical, co pozwala użytkownikowi szybko zidentyfikować krytyczne śruby. Ponadto można wygenerować raporty obliczeniowe dla każdej analizowanej śruby.
Ważnym aspektem analizowania śrub zgodnie z normą VDI 2230 przy wykorzystaniu ACT jest prawidłowe zamodelowanie śrub. Norma VDI 2230 Part II dokładnie określa sposoby modelowania. W przypadku belek ACT zaleca nam modelować belki o uśrednionym przekroju wzdłuż całej śruby lub modelować belki o rżnych przekrojach wzdłuż śruby Rysunek 2.
W przypadku śrub modelowanych jako bryła każda z śrub musi się składać tylko z jednej bryły. Zaleca się modelować łeb śruby jako cylinder, gwint należy pominąć. Zaleca się modelować grną część śruby średnicą nominalną d (trzpień śruby), natomiast dolna część śruby odpowiadając części gwintowanej modelować średnicą d3 Rysunek 3.
W kolejne zakładce Interface mamy możliwość włączenia lub wyłączenia oszacowania wspłczynnika bezpieczeństwa przed poślizgiem. W przypadku włączenia tego wspłczynnika należy ustawić liczbę interfejsw, wspłczynnik tarcia oraz Pinball Parameter, ktry określa węzły z kontaktu, ktre są używane do oceny wspłczynnika bezpieczeństwa przed poślizgiem.
Na podstawie analizy MES wyznaczane są siły i momenty działające w połączeniu śrubowym. Następnie wyniki te oraz zdefiniowane wcześniej parametry są przenoszone do zewnętrznego solvera, ktry oblicza wspłczynniki bezpieczeństwa:
Jak widać modelowanie śrub zgodnie z normą VDI 2230 jak i postprocessing nie jest bardzo skomplikowane. Dużo trudniejsze jest rozumienie samej normy dlatego też prowadzimy kurs Modelowanie Połączeń Śrubowych Zgodnie z VDI 2230.
Due to increasing demand for simulations, precise results and reduced post-processing, it is a must to automate repetitive routines, such as calculation of bolted connections, wherever possible. In particular, large complex models with numerous bolted joints.
This article demonstrates graphical user interface (GUI) application possibilities in calculating pre-tensioned bolted connections using PyMAPDL. The application uses widely recognised standards for bolted connections such as EN 1993-1-8 and VDI 2230. In addition a simplified code snippet is shown below that extracts reaction forces from a bolted connection and saves the results to a Microsoft Excel file. This file can be used for further analytical calculations in Python and/or in Excel.
The focus of this piece is on demonstrating post-processing of a double bolted lap joint. It demonstrates the capabilities of PyMAPDL to automate, access, post-process and visualize the resulting data.
As can be seen the application takes the model with created named selections for a bolted group and calculates slipping resistance factor (SRF) for each bolt.The local coordinate system is used for each bolt regardless of its orientation. The application gives insight into the results for bolts together with a mesh model. It reduces post-processing time and helps visualize the results that are not accessible in Ansys normally.
PyAnsys enables automation of routine tasks utilising the immense capabilities of the Python language, which significantly reduces postprocessing time and allows Python-based libraries to be coupled to scripts. It sets a new level of finite element calculation in Ansys allowing for more in-depth automation at both the pre- and post-processing stages.
Here you can find a list of all implemented engineering standards and safety codes in SDC Verifier that you can use out of the box to check your structure directly in SDC Verifier or your FEA software.
SDC Verifier is software that can be used to verify FEA results against industry standards. It can be used as a dedicated software with design and verification capabilities, or as a plug-in for other popular FEA software such as Ansys Mechanical, Femap, or Simcenter 3D.
SDC Verifier offers comprehensive support for bolt check calculations, incorporating three distinct bolt check standards to ensure a wide range of compatibility and flexibility in your structural engineering projects. These standards include:
Eurocode 3 (EN1993) Bolt Check: SDC Verifier is equipped to perform bolt checks in accordance with the Eurocode 3 standard (EN1993), ensuring compliance with European design codes for steel structures. This standard is widely recognized and used in Europe for assessing the safety and reliability of bolted connections.
AISC 360-10 Bolt Check: The software also includes support for the AISC 360-10 Bolt Check standard, which is based on the American Institute of Steel Construction (AISC) specification. This standard is essential for engineers and designers working on steel structures in the United States, as it helps ensure structural integrity and safety.
VDI 2230: In addition to the Eurocode and AISC standards, SDC Verifier offers compatibility with the VDI 2230 guideline. VDI 2230 is a German standard that provides guidelines for calculating the safety of bolted joints, offering a reliable method for engineers working on projects adhering to German engineering standards.
Bolts are among the most commonly used connecting elements and are therefore often used in large numbers to connect components with each other. The challenge is to evaluate many bolts as efficiently as possible, conveniently for the software user and reliably over the entire service life. For this reason, the ANSYS application Fast+More was developed by engineers from practice for engineers, bringing together the best of two worlds: the FEM software of the market leader ANSYS and the detailed verification in KISSsoft.
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