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Simulating a rubber fibre reinforced air spring using Abaqus

Posted by Christine Obbink-Huizer on Oct 15, 2020 9:45:00 AM

In this blog, we’ll take a look at an air spring (Figure 1). This device is used for vibration isolation as well as suspension, for example in heavy weight vehicle applications.

Figure 1: Example of an air spring.

The example shown here consists of a convoluted bellows (two convolutions), with steel plates on each end. In practice, one to three convolutions are used. The bellows is made of rubber that is reinforced with fibres. A steel girdle hoop helps to keep it in shape when it is filled with compressed air.

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Topics: Rubber, Abaqus, Tips, Tricks & Approaches, fibre-reinforced rubber, airspring

Solving unexpected results in Abaqus. Problem or puzzle?

Posted by Christine Obbink-Huizer on Oct 12, 2020 9:57:58 AM

Sometimes the results I get from Abaqus are not what I expect. Perhaps the analysis does not complete while I didn't think it would be very troublesome, or I do get results, but they don't make sense to me. Though this can be very frustrating, it can also be seen as an interesting puzzle (especially if it is somebody else's problem ;) ). For that reason, I'd like to share some results with you that did not make sense to me. Let's see whether you can figure out what went wrong!

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Topics: solving non convergence with Abaqus FEA, Abaqus, Tips, Tricks & Approaches

3DEXPERIENCE Platform: Defeaturing STEP geometry for simulation in 1,5 min

Posted by Christine Obbink-Huizer on Sep 17, 2020 5:23:21 PM

As a consultancy company, we regularly receive geometry files from external parties. Typically this geometry isn’t ideal for simulation purposes: it includes details that are not of importance for the analysis, while they will negatively impact meshing and simulation time. Therefore, it is beneficial to remove some of the features from the geometry (defeature it) for simulation purposes.

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Topics: Tips, Tricks & Approaches, 3DEXPERIENCE Platform, Defeaturing, Simulation model preparation app

Metal roll forming process analysis in Abaqus

Posted by Christine Obbink-Huizer on Aug 21, 2020 10:13:21 AM

As you may have noticed, we're working on kind of a series of blogs on the simulation of different production techniques. This time, we will look at roll forming.

Roll forming

During the roll forming process, a long strip of sheet metal is continuously bent into the desired cross-section. The strip passes through a number of sets of rollers, where each set performs a part of the total desired bend, until the final profile is obtained.

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Topics: Abaqus, metal forming, Tips, Tricks & Approaches, roll forming process

Flow induced movement on a validated model with XFlow CFD

Posted by Dolf Broekaart on Aug 18, 2020 11:12:59 AM

In this blog we will discuss the process to determine movement of bodies due to a fluid flow, performed with XFlow CFD. As an example we have taken a historic measurement device called a "Wildse Vaan".

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Topics: FSI, XFlow CFD, Tips, Tricks & Approaches

Metal tube hydroforming process and forming limit diagrams in Abaqus

Posted by Nikolaos Mavrodontis on Aug 5, 2020 10:30:00 AM

In this blog post, we will be discussing about metal tube hydroforming with Abaqus. We will be using forming limit diagrams to create the material's strain envelope, for avoiding necking (rupture), a possible failure mode, in this type of metal forming process. This will be demonstrated in a hydroforming process simulation of a metal bellows joint.

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Topics: Abaqus, Tips, Tricks & Approaches, hydroforming, Forming Limit Diagram, FLD

Simulating the thermoforming process with Abaqus

Posted by Christine Obbink-Huizer on Jul 21, 2020 9:45:00 AM

Thermoforming is a manufacturing process where a plastic sheet is heated to a pliable forming temperature, formed to a specific shape in a mould, and trimmed to create a usable product (https://en.wikipedia.org/wiki/Thermoforming). Often a vacuum and maybe even a plug is used to help the sheet take the shape of the mould.

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Topics: Abaqus, Tips, Tricks & Approaches, process, Thermoforming

Simulating spring back after metal forming in Abaqus

Posted by Christine Obbink-Huizer on Jun 22, 2020 9:29:20 AM

When producing a part, you want it to match the design, the geometry. How to achieve this is not always evident.

For example, when the part is created from sheet metal by pressing it between an upper and lower die, the final part may not fully match the space in between the dies due to the spring back effect. If the deformation would be fully plastic, then the deformed shape will not change during unloading. If it is partially elastic, then the elastic deformation is recovered upon unloading and hence the final shape differs from the shape between the dies. In this blog I’ll give an example of this effect, showing that we can model it with Abaqus.

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Topics: springback, metal forming, Tips, Tricks & Approaches, sheetmetal

Join our online webinar: Contact & Convergence with Abaqus

Posted by Dolf Broekaart on May 25, 2020 9:00:00 AM

Sometimes you may wish to simulate a process where various parts interact with one another. In such cases it is often impossible to rely on predefined loads and boundary conditions, since the exact points of contact are dependent on the solution. Including contact in your simulation can be a more realistic way to represent loadings.

Abaqus provides a wide range of mechanical models and numerical methods for contact. We will begin this month’s webinar with an overview of these capabilities, considering how to select the best options for a given problem. We will then move on to some challenging example problems and investigate how advanced features of Abaqus contact can help convergence and ensure you obtain realistic solutions.

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Topics: software, solving non convergence with Abaqus FEA, Abaqus, contact analysis, Tips, Tricks & Approaches

Performance assessment of a Peristaltic Pump

Posted by Nikolaos Mavrodontis on May 22, 2020 11:37:02 AM

In this blog post, we will be showcasing a fully coupled fluid structure interaction (FSI) analysis, of a peristaltic roller pump. This study will focus on assessing the performance of a peristaltic pump, under operation. This co-simulation analysis, will solve for both the structural and fluid domains' unknown quantities, during 1 revolution of the rotating mechanism of the pump.

This is an example of a challenging application, in which numerical modelling and computer simulations can provide a lot of insight and value.

The aspects we want to evaluate in this digital model are; determining the volume flow-rate for a given rotation speed, assessing contact stress areas on the tube, and determining the torque output for the given rpm.

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Topics: Abaqus, FSI, XFlow CFD, Tips, Tricks & Approaches, Peristaltic Pump, Co-Simulation

About our FEA Blog:

Simuleon blog topics related to Finite Element Analysis like; Structural Analysis and CFD analysis performed with SIMULIA Abaqus FEA, XFlow CFD, Isight Simulation Automation, Tosca Topology Optimization and Fe-Safe accurate Fatigue.

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