Finite Element Analysis

Veryst offers leading expertise in advanced finite element modeling.  Although many firms offer finite element (FE) modeling, Veryst possesses an advanced level of knowledge for modeling complex, nonlinear problems across industries.  Many of our staff come from leading nonlinear software firms and we have official partner relationships with several firms, including ANSYS, COMSOL, and Dassault/SIMULIA.  We can address problems that other finite element analysis consultants either cannot or are not sufficiently experienced to do well.  Some our strengths in finite element analysis are detailed below.
 

Rapid Response

We can translate designs from CAD to the completion of highly nonlinear analyses quickly. Our typical nonlinear FE analyses include modeling drop and impact, complex contact, failure modeling, and nonlinear material behavior including viscoplasticity, creep and relaxation, anisotropy, and failure modeling. 
 

Nonlinear Materials

We are world-leading in incorporating nonlinear, rate- and temperature-dependent behavior with damage, anisotropy, and history effects in finite element codes.  We have modeled elastomers, foams, thermoplastics, and thermosets as well as other nonlinear materials.  Veryst offers the PolyUMod® library of polymer constitutive models to increase the capabilities of commercial finite element codes in modeling complex material behavior.
 

Micro-scale Modeling of Hose and Reinforcement Layers
Macro-scale modeling of hose and reinforcement layers

Contact

We have world-leading expertise in contact mechanics.  We can implement changes in contact and frictional constitutive behaviors to ensure simulation accuracy and reduce computational demands.  We also solve contact problems involving adhesion, microscale contact problems involving surface tension, as well as multiphysics contact problems where the contact conditions influence the thermal, acoustic, electromagnetic, and/or fluid flow fields.
 

Dynamic Impact

Dynamic simulations and impact analyses require familiarity with the complexities of explicit simulation.  Veryst has performed numerous explicit impact simulations varying from consumer products to large structures, and can implement strategies for efficient and accurate explicit models.
 

Anisotropy

Veryst has extensive experience with material anisotropy, ranging from induced anisotropy from manufacturing processes to composite materials.  The PolyUMod library has explicit anisotropic models, and we have modeled textiles, fiber-reinforced elastomers, and composite materials.
 

Validation

Simulations require validation.  Veryst has extensive experience through its laboratory facilities applying targeted experimentation for calibration and validation of finite element simulations.  Our validation efforts also involve sensitivity and uncertainty analysis.  We emphasize the need for validation throughout our simulation projects, particularly given their complexity and concomitant uncertainty.


Advanced Material Models for Finite Element Simulations

FEA Plot
A comparison between experimental data and
a calibrated Three Network model for UHMWPE

In many finite element simulations of polymer components the most challenging step is the specification of an appropriate material model that captures the experimentally observed nonlinear viscoelastic or viscoplastic response of the material.  Veryst has developed a library of user-material models that accurately captures the response of elastomers, biomaterials, thermoplastics, and thermosets.  These material models can be added to commercial finite element software as an external library and enable significantly more accurate simulations and predictions of real materials than what is possible with built-in material models. 

The figure above shows an example of the accuracy of one of these user-material models.  The figure compares the experimentally-determined cyclic loading response of ultra-high molecular weight polyethylene (UHMWPE) with predictions from the Three Network Model, which was specifically developed for this class of materials. 

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Elastomer Foam Vibration Damper

Elastomer foams make excellent vibration dampers, but accurately designing these dampers requires an advanced material model. Veryst calibrated a PolyUMod® material model to design the vibration damper.

Design of Reinforced Hoses

A high-strength reinforced hose failed in service under normal operating conditions well before its intended design life. Inspections of the subject hose revealed that failure was mainly due to delamination.

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