In this blog I wanted to explore the age-old question facing most FEA analysts: Is my model good enough? with examples from my PhD work in knee joint biomechanics.

To create an FE model and run it in a reasonable amount of time, several assumptions and simplifications are needed. One of the aims of one of the knee joint FE models I developed previously was to rapidly identify locations at risk of OA in a patient-specific manner. To achieve the rapid part we used simplified materials models for the main tissues in the knee joint, based on previous literature studies:

Five years ago, we posted a blog about analyzing a PET-bottle, including a top load analysis performed with Abaqus. This type of analysis is used to determine the maximal force a bottle can withstand under axial loading. In the current blog I want to revisit the topic, and focus specifically on materials properties. Often these are not readily available. Perhaps a data sheet is present, specifying a Young's modulus and a Yield stress (if you're lucky) but not the actual stress-strain data. Here we'll take a look at the impact of using limited material data on the limit load in a top load analysis.

Assessments of bolted joints can be performed for a number of reasons. Before starting any FE modelling of bolted joints it is important that the analyst considers the purpose of the analysis and plans it. A summary of typical aspects which should be considered during the planning will be covered.

The structural and thermal behaviour of bolted joints can be affected by a range of factors, including pretension, relaxation, friction and gasket properties. A discussion of factors which may be relevant will be given.
A number of FE modelling techniques can be used to analyse bolted joints. These will be described, along with their benefits and limitations.

The “Introduction to Non-Linear Analysis Workshop” on the 19th of March from 13:00 - 17:00 CET, is a free ONLINE event for anyone who has some experience of simulation and FEA, but would like to look at extending the scope of the work they do. This workshop is an ideal way to understand what advanced simulation and SIMULIA Abaqus can offer, and find out how easy it actually is to perform a real world non-linear analysis.

Hi!

I am Simuleon’s newest member and in this blog I’d like to give a short introduction to myself.

I am originally from Romania, where I finished my Bachelor’s in Electronics and Telecommunications. Then I moved to cold, but very nice Finland, where I finished my master’s in Science and Bioengineering and, just recently, my PhD in Applied Physics. In total, I’ve lived in Finland for about 9 years. Me and my partner moved to Veldhoven in July last year and are currently exploring the Dutch nature and culture.

One thing we noticed is that both the Finns and the Dutch love ice-skating, though the former has a bit of a climate advantage when it comes to natural ice.

In this blog we have given the honour to Per Landeback as a special guest writer for our blog. Per has written this great blog about a parametrical Equation to calculate Rolling Resistance of a car tire.

BIO - Per Landeback

Retired test and simulation engineer with vast experience of various vehicles as car, bus, truck and train. Studied at Chalmers University of Technology and performed Master Thesis at a Volvo Aero military engine. Held previous positions as employee/consultant at SAAB, Volvo Truck, Volvo Bus, Bombardier, Scania Truck and NEVS (National Electric Vehicle Sweden). Technical aeras within Comfort, Handling, Braking, Steering, Suspension, Engine mountings, Tires and General component calculation/simulation

"Thank you for the invitation to write about tire rolling resistance and especially about my developed Parametrical Rolling Resistance Equation. This is considered as a first publication and it very likely a paper will be a published. Therefore, general Copywrite rules apply."

This month’s webinar will be used to give and overview of what is new in Abaqus/CAE 2021.

This will cover:
• New additions to Abaqus/CAE, including the odb splitter/reducer and additional functionality in the Solidworks Associative Interface.
• A summary of some of the developments that are supported through the keywords interface. These cover areas such as enhancements in contact, material modelling and multiple non-linear load cases.
• An overview of the installation process for Abaqus/CAE 2021.

The content will be suitable for any Abaqus user regardless of experience level.

Abaqus has many built-in options but sometimes these do not suffice. You may want to include a material model that is not implemented, have a complex type of loading that is not available by default or even define your own element. Abaqus' user subroutine capabilities allow you to do this. User subroutines are written in Fortran and in order to use them, you need a Fortran compiler. In this blog I'll show how to install a freely available fortran compiler and link it to Abaqus. Thanks to Oliver Lundqvist working for Sweco in Finland for making me aware of this option, and to oaeres on https://community.intel.com/t5/Registration-Download-Licensing/How-to-link-ABAQUS-with-Intel-One-API-toolkits-to-run-FORTRAN/td-p/1244548/page/2 who provided this solution (especially the last workaround).

The "Introduction to Advanced Contact Workshop" on the 19th of February is a free ONLINE event for anyone dealing with complex contact conditions, who has beginner or advanced experience in simulation and FEA, but would like to look at extending the scope of the work they do. This workshop is an ideal way to understand what advanced simulation with robust contactsolver in SIMULIA Abaqus Software can offer, and find out how easy it is to perform a real world non-linear analysis.

In this blog post, we will be looking into a different discretization method, available in Abaqus Explicit. This discretization method can prove to be really useful, in applications where gross distortions or large spatial displacements are expected to occur. A category of applications that can benefit from such a technology, are installations/decommissions of deep sea components, interacting with the seabed.