Blog Articles

TNV Model Introduction
This article explains the foundation and multinetwork structure of the PolyUMod TNV material model and why it is so accurate.
The integral equation form of linear viscoelasticity is identical to a rheological model with parallel spring-and-dashpot networks.
PET Through Tg
Tutorial on how to simulate the large-strain temperature-dependent response of thermoplastics through the glass transition temperature (Tg).
DMA Temp Sweep Image
This article explains how you can calibrate a viscoelastic material model to DMA temperature sweep data alone.
Sometimes it is possible to calibrate a viscoplastic material model to a single monotonic tension curve. This article has the details.
Explanation of how linear viscoelasticity can predict the response due to a dynamic load. The focus is on the storage and loss modulus.
Combined hardening plasticity is perhaps the most interesting type of plasticity model. This article explains how to use this type of model.
LVE Prony Spectrum
A Prony Spectrum is a very useful concept that will help you calibrate and use linear viscoelastic models. This article explains how to do it.
LVE Multiaxial Large Strains
This is part 3 of my series on Linear Viscoelasticity. The focus of this article is on making the calculations large strain and multiaxial.
PolyUMod Mentat
Step-by-step video tutorial on how to set up and use a PolyUMod material model in MSC Mentat and Marc.
LVE Part 2 - Solve
This is part 2 of my series on Linear Viscoelasticity. The focus of this video is on how to calculate the stress response in a numerically efficient way.
Linear viscoelasticity derivation
This is part 1 of my series on linear viscoelasticity. The focus is on how to derive the stress response in uniaxial loading at small strains.
ChatGPT for Polymers
In this article I will explore how useful the new AI tool ChatGPT from OpenAI is for topics related to polymer mechanics.
Study aimed at determining the most accurate material model for a polybutadiene rubber exposed to large strain time-dependent loading.
Unique Material Parameters
If you repeat a material model calibration multiple times, should you expect the optimal material parameters to be unique?
Stress Relaxation Time
Stress relaxation and creep are useful experiments. This article shows that even short-term experiments of these types are great.
Santoprene featured image
Deep dive on how to select and calibrate a suitable material model for a Santoprene thermoplastic vulcanizate.
Elastollan Creep
Tutorial on how to create an accurate creep material model for an Elastollan TPU using experimental data form the CAMPUS material database.
Anisotropic Viscoplastic Calibration
In this article I show how to quickly calibrate an anisotropic viscoplastic material model to uniaxial tension data.
Graphical Models
In this article I explain how you can graphically visualize the rheological model in order to better understand how these models behave.
Blog Gough-Joule
What is the Gough-Joule effect and how to model it in a finite element analysis? This article explains it all.
Create a TTS Master Curve
This article demonstrates one common mistake that people make when they generate a TTS Master Curve from DMA data.
Nylon (PA66) Models
Nylon is a commonly used in industrial applications. This article examines which material model is most accurate for Nylon PA66.
This article shows that the WLF equation is always the same or better than the Arrhenius model.
Volumetric Relaxation Prony
Most people assume that the volumetric relaxation is zero in a Prony series. This article demonstrates a different approach that can be better for some materials.
CPVC Material Models
CPVC is s commonly used industrial material. This study determines the best large-strain material model for CPVC.
Don't Forget E Modulus.
This article demonstrates one problem that can occur if you calibrate a material model without considering the initial Young's modulus
PTFE Featured Image
PTFE (Teflon) is a material with many unique properties. This article examines the accuracy of different material models for PTFE.
ABS Model Featured Image
In this article I examine how different material models can predict the response of ABS, and I will show which model is the best!
The commercial FE solver Radioss from Altair is now open source! This article shows how to download, compile, and use the OpenRadioss.