Compressible Elastometric Foams Large Deformation by a Strain-Based Logarithmic Hyperelastic Model
Elastomeric foams are unique materials with Hyperelastic properties, making them ideal for applications that demand flexibility, energy absorption, and durability. To accurately simulate their behavior under large deformations, this package introduces a constitutive model based on logarithmic strain invariants for precise calculation of stiffness and stress. The model is implemented in Abaqus using a custom UMAT subroutine, giving you full control over material definition and enabling realistic finite element simulations.
The tutorial includes two step-by-step workshops: one dedicated to simulating tension in elastomeric foams, and the other focused on compression. Each workshop guides you through the entire process; from problem setup and subroutine coding to running the analysis and interpreting results.
With comprehensive tutorial videos, supporting files, and detailed explanations, this package equips you with both the theoretical knowledge and practical skills needed to model elastomeric foams confidently and extend the approach to advanced applications.
Multiscale Analysis of Hygrothermal Aging in Laminated Composites
This package includes parallel and multi-scale aging analysis of fiber-reinforced composite laminates exposed to thermal and humidity loads. In this project, parallel analysis methods are used to simulate and analyze the composite at both micro and macro scales. The laminate simulations are carried out in the graphical interface of Abaqus at the macro scale, while the micro scale analysis is conducted through Python scripting in the non-graphical Abaqus environment. The parallel analysis between the two environments is facilitated using Abaqus UMAT subroutines. The stress tensor and elasticity properties obtained at the micro-scale are passed to the UMAT subroutine, which then defines and updates the Jacobian matrix and stress tensor for all macro-scale integration points.
Abaqus Simulation of the Curing Process in Composites: A Specific Focus on the Pultrusion Method
Pultrusion is a crucial task for producing constant-profile composites by pulling fibers through a resin bath and heated die. Simulations play a vital role in optimizing parameters like pulling speed and die temperature to enhance product quality and efficiency. They predict material property changes and aid in process control, reducing reliance on extensive experimental trials. However, simulations face challenges such as accurately modeling complex material behaviors and requiring significant computational resources. These challenges underscore the need for precise simulation methods to improve Pultrusion processes. This study employs ABAQUS with user subroutines for detailed mechanical behavior simulations, including curing kinetics and resin properties. Key findings include insights into material property changes, and optimization strategies for enhancing manufacturing efficiency and product quality. This research provides practical knowledge for implementing findings in real-world applications, advancing composite material production.
Notice that, pultrusion is a composite curing method, which may share some overlapping features with our Intermediate and Advanced curing packages. However, what sets pultrusion apart is that the composite passes over a heated die during the process. In this project, the die has also been modeled, with environmental heat applied to it using convection and a film subroutine. The heat is subsequently transferred to the sample through contact with the die. Afterward the die is removed. All these procedure is modeled in this project, with Abaqus CAE step-by-step. In contrast, in our Intermediate and Advanced packages for the oven curing of prepregs, no die has been modeled. The heat is applied without convection and, for simplicity, the heat is treated as a first-type boundary condition, which introduces some errors.
Abaqus Simulation of Superelastic Cardiovascular Stents
- The expansion of a balloon inside a stent
- The bending of a stent within a vessel
- The withdrawal of a stent from the vessel
Composite Fatigue Simulation with Subroutine in ABAQUS (unidirectional) for 3D Element
Fatigue in composites refers to the weakening of a material caused by repeatedly applied loads or stress cycles over time. When a composite material is subjected to cyclic loading, small cracks or microdamage can form within the material, which may grow and lead to failure after a certain number of loading cycles. This is a significant consideration in the design and analysis of composite structures, especially in applications subjected to repeated stress, such as in aerospace, automotive, or civil engineering.
In one of our other packages, we have used the UMAT subroutine in Abaqus to simulate fatigue in composites in two-dimensional space. The current project is more comprehensive, as it addresses composite fatigue in both 2D and 3D spaces. So you can use it for the simulation of both shells and solids. In this project, you will first become familiar with simulating composite fatigue in 2D space using the Abaqus UMAT subroutine. Then, we will provide a complete UMAT code along with Abaqus files for extending the simulation to 3D space, enabling the 3D simulation of composite fatigue in Abaqus.
Simulation of the Generalized Maxwell Viscoelastic Model using UMAT Subroutine
This research presents a precise three-dimensional mechanical response of viscoelastic materials, such as polymers and elastomers, using the generalized rheological Maxwell viscoelastic model (considering the five Maxwell elements). That is to say, we implement the Maxwell model of viscoelasticity using the UMAT subroutine for the Abaqus standard solver. To clarify, using the concepts in this tutorial, you can implement the model for any N-Maxwell elements, using the viscoelastic Maxwell model.
The Maxwell viscoelastic model is appropriate for qualitative and conceptual analysis, but the single Maxwell element is not sufficient to describe the behavior of elastomers and polymers. For a more precise definition of these materials, the generalized Maxwell viscoelastic model is used. In the generalized Maxwell viscoelastic model, N piece of Maxwell elements and a single spring (the Hooke-element) are assembled in parallel. This tutorial, by customizing the UMAT subroutine to simulate flexible samples behavior, contributes to the advancement of viscoelastic materials design and analysis.
Laser Assisted Machining (LAM): Modeling and Simulation in Abaqus/CAE
In this tutorial, a comprehensive discussion on modeling and simulation of laser assisted machining is presented. It includes building FEM-based models of machining, laser heating, and laser-assisted machining models in Abaqus/CAE. The finite element method (FEM) simulation is based on the coupled thermo-mechanical behavior. The package walks learners through building models that simulate the impact of laser heating on the workpiece. Detailed lessons cover constructing basic machining and laser heating models, setting boundary conditions like cutting speed and laser power, and writing subroutines such as DFLUX and VDFLUX to simulate laser heat sources. Additionally, learners will perform analyses to study temperature distribution, and stress-strain behavior. Through parametric analysis and comprehensive result evaluation, learners will gain a deep understanding of temperature distribution, stress behavior, and how laser heating can improve the machining process.
Simulation of Inertia Welding process in Abaqus | Fortran Subroutines and Python Scripts
This tutorial provides a comprehensive guide to simulating inertia friction welding process using Abaqus, a powerful Finite Element Analysis (FEA) tool. Inertia welding process, commonly used in aerospace, automotive, and manufacturing industries, is a solid-state process that joins metal parts using kinetic energy. The simulation focuses on modeling frictional heating, temperature distribution, and material behavior through integrated Fortran subroutines and Python scripts. These scripts automate tasks such as remeshing and model generation, enhancing efficiency. Key steps include defining axisymmetric models, applying material properties, and simulating thermal and mechanical interactions during the inertia welding process. This guide equips researchers and engineers with a robust methodology for inertia welding simulation, to optimize welding parameters and analyze weld quality.
Using Viscoelastic and Path-Dependent Models for Analyzing the Curing Process in Fiber-Reinforced Composites With Abaqus subroutines
Abaqus Kelvin Voigt Model (Viscoelastic) Simulation Using UMAT and VUMAT Subroutines
This research presents a precise three-dimensional mechanical response of viscoelastic materials using Abaqus kelvin voigt viscoelastic model. We performed this kelvin voigt model Abaqus simulation using both UMAT and VUMAT subroutines for standard and explicit solvers.
The behavior of viscoelastic materials is a state between the behavior of a liquid and a solid. In other words, they behave both like liquids and solids. That is to say, there are many natural and synthetic materials that are classified as viscoelastic materials; From the biological structures of the body such as skin, cartilage and tissue to concrete, foams, rubbers, and synthetic polymers. Due to these unique properties, viscoelastic materials have many applications.
In this regard, the primary goals of this study include the development and implementation of an accurate three-dimensional Abaqus kelvin voigt viscoelastic model, and the integration of viscoelastic properties into the analysis, which can improve the prediction of viscoelastic materials response under different boundary and loading conditions.
This tutorial, by customizing the UMAT and VUMAT subroutines to simulate flexible samples behavior, contributes to the advancement of viscoelastic materials design and analysis.
Implementation of Soil Constitutive Models in Abaqus | With a Special Focus on CJS Models
Constitutive model implemented in calculation code, play an important role in the material behaviors prediction. In the field of geotechnical engineering there are numerous soil constitutive models. By installing these models in a finite element code such as Abaqus, their development, efficiency and advancement can be increased. Also, more and more complex engineering problems can be solved by this method. But to do this, you need a proper understanding of the mathematical and programming basics of these models. This tutorial focuses on implementing advanced constitutive models in Abaqus, particularly for simulating soil behavior. Focusing on the CJS model, this tutorial tries to teach how to work and how to program these models in Abaqus code. It includes detailed explanations of VUMAT and UMAT subroutines and practical examples of implementing the CJS model.
Note: In this project, we have discussed the UMAT and VUMAT subroutines, their specifications, and features. You will become familiar with the implementation of both UMAT and VUMAT subroutines. However, the specific focus of this project, for which we have provided the necessary files and run the analysis, is on using the VUMAT model. If you need to use Abaqus for this project with the standard solver, you will need to write the UMAT subroutine yourself.
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