Blog Articles

It would be very handy if uniaxial compression was the same as biaxial tension. But is it? This article has the answer.
Investigation of how important the bulk modulus is in a FE simulation. Using MCalibration and Abaqus, I show that most of the time the bulk modulus has virtually no influence
MCalibration can calibrate all solid mechanics material models in COMSOL Multiphysics. This tutorial shows how.
Demonstration of how you can quickly calibrate the Extended Tube Model that is available in COMSOL Multiphysics.
The preload time is important when you analyze a stress relaxation experiment. This article explains why.
Tutorial showing how you can take experimentally stress relaxation data at different temperatures and create both a master curve and a linear viscoelastic material model that captures all the data.
Tutorial on how to extract the data from an image of a graph into either an external data file or MCalibration. The data extraction allows for the use of cubic
Theory of how the constitutive elements influence the predicted yield stress dependence on strain rate
Review of how different material models can be used to predict the non-linear response of PC. Also covers how the yield stress depends on the strain rate.
Video tutorial showing how to remove one load cycle from an experimental test.
Quick discussion about the math behind stress relaxation and creep in polymers.
Discussion about how to extrapolate the stress relaxation response of rubbers to long times.
Discussion about how to best estimate the long-term stress relaxation response of a thermoplastic based on short-term data.
Hytrel is a thermoplastic polyester elastomer. In this post I examine what material models can be used to predict the response of this class of materials.
This article explains why some rubbers get softer with increasing temperature, and why some rubbers get stiffer.
Tutorial on how and when to set the ORIENT flag with using Abaqus and an anisotropic material model from the PolyUMod material model.
In this video I will show have to make most Abaqus/Standard simulations that use the PolyUMod library run faster (and with larger time increments). The key is to set an
Tutorial on how to use a Parametric Study in MCalibration to determine the influence of different material models.
Tutorial on how to predict the creep response of polycarbonate and other thermoplastics
Demonstration of how to accurately predict the deformation response of a soda bottle under internal pressure.
The applied stress triaxiality influences the mechanical response of thermoplastic materials in non-intuitive ways. In this article, I will explain how.
MCalibration can optimize both the specimen shape and material parameters at the same time. Here's how!
Demo of how to simulate a Teflon seal using Ansys using a viscoplastic material model, without any experimental data.
How to run COMSOL Multiphysics using an input file and a command prompt. It is easy using the Java API.
Guide to using MCalibration and PolyUMod with COMSOL Multiphysics. A complete start-to-finish tutorial is presented.
Soft polymer foams, and some other materials, often exhibit different stiffnesses in uniaxial tension and compression. Most material models cannot predict this type of behavior, but there are some excellent
A material model is considered Drucker's stable if an increase in strain results in an increase in stress. In some cases it can be important to enforce that a material
Instructions for how to make sure Ansys Mechanical finds and uses a PolyUMod material model.
Here is a presentation about (non-linear) material modeling of polymers. I gave the presentation on 2021-06-24.
Introduction In this article I will show how you can quickly convert any Ansys material model (in APDL format) into stress-strain predictions using MCalibration. That is, I will show how