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Abaqus Kelvin Voigt Viscoelastic Simulation Using UMAT and VUMAT Subroutines

A viscoelastic material exhibits characteristics of both solids and fluids when subjected to stress. This distinct behavior makes them useful in various applications. To use viscoelastic materials in various applications, we need to predict their behavior under different loading conditions. This tutorial discusses in detail how numerical methods address this matter (Abaqus kelvin voigt viscoelastic). The Kelvin-Voigt model describes viscoelastic behavior using a spring and a damper in parallel (kelvin voigt model abaqus). It effectively predicts creep, simulates material responses to impacts, and determines viscoelastic properties of materials like foams, rubbers, and biological tissues. Despite its strengths, it has limitations in describing stress relaxation. This tutorial focuses on implementing the Kelvin-Voigt model in Abaqus CAE using UMAT and VUMAT subroutines. While these subroutines are powerful, they require Fortran knowledge, posing a challenge. To assist, the tutorial provides a step-by-step guide on reviewing the model's formulation and writing the subroutines for both standard and explicit solvers. The tutorial demonstrates capturing damage in a problem, but the results are general, such as stress and displacement. You can customize the subroutine for your models and extract specific results without significant difficulty.

Viscoplasticity Abaqus Simulation Using UMAT Subroutine | Perzyna Viscoplastic Model


Viscoplasticity describes the rate-dependent inelastic behavior of materials, where deformation depends on both stress magnitude and application speed. This concept is crucial in many engineering applications, such as designing structures under dynamic loads, modeling soil behavior during earthquakes, and developing materials with specific mechanical properties. Viscoplasticity Abaqus simulation, especially using Abaqus with UMAT subroutines, are vital for understanding, predicting, and optimizing the behavior of viscoplastic materials. This tutorial focuses on implementing the Perzyna viscoplasticity model in Abaqus. The Perzyna viscoplastic model, a strain rate-dependent viscoplasticity model, relates stress to strain through specific constitutive relations. This involves defining plastic strain rate based on stress state, internal variables, and relaxation time. The tutorial provides general UMAT codes for viscoplastic analysis, yielding results like stress fields essential for various engineering applications. These simulations help in predicting permanent deformations, assessing structural failure points, and analyzing stability under different loads, benefiting fields such as aerospace, automotive, civil engineering, and energy.

Pultrusion Crack Simulation in Large-Size Profiles | Pultrusion Abaqus


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 crack formation (pultrusion crack simulation), material property changes, and optimization strategies for enhancing manufacturing efficiency and product quality. This research (pultrusion Abaqus) provides practical knowledge for implementing findings in real-world applications, advancing composite material production.

Elastomeric Foam Simulation Using Abaqus Subroutines

This study focuses on modeling the mechanical behavior of open-cell, isotropic elastomeric foams. It is essential for applications in materials science and engineering. The project offers insights into designing customized elastomeric foam materials tailored for impact protection in automotive, sports equipment, and aerospace industries. Numerical simulations, using software like Abaqus, enable the prediction of complex behaviors such as hyperelasticity and viscoelasticity under various loading conditions. This finite element analysis of elastomers includes theoretical formulations for hyperelastic constitutive models based on logarithmic strain invariants, crucial for accurately describing large deformations. Practical benefits include the implementation of user-material subroutines in Abaqus, facilitating future extensions to incorporate strain-rate sensitivity, and microstructural defects analysis. This comprehensive approach equips learners with theoretical knowledge and practical tools to advance elastomeric foam simulation. Moreover, it enhances their capability to innovate and optimize materials for diverse applications.

Techniques of simulating Large and Complex models in Abaqus

Sometimes, there is a need to simulate large or complex models in Abaqus, such as airplanes and cars. Generally, models with more than 5 million variables or take at least 12 hours to analyze are considered large. Processing such models requires a significant amount of time and energy, in addition to potential issues with modeling, loading, boundary conditions, and more. Therefore, it is necessary to find ways to simplify and accelerate the analysis of such models. In this training package, you will learn various methods to address these challenges. Dealing with large models typically involves simplifying the model, making efficient use of system resources, and minimizing CPU time. These techniques are explained in detail here. Additionally, you will be taught various techniques to aid in the management of large models, including submodeling, history output filtering, restart functionality, and parts and assemblies.

Piezoelectric simulation in Abaqus

Piezoelectric materials exhibit a unique property known as piezoelectricity, where they can generate electric charges when subjected to mechanical stress or deformation, and conversely, deform when an electric field is applied. This phenomenon arises from their crystal structure, enabling the conversion of mechanical energy into electrical energy and vice versa. Simulating piezoelectric materials is of great importance as it allows engineers to optimize the design and performance of devices and systems that utilize these materials. Through simulations, engineers can analyze factors like stress distribution, deformation, and electrical response, aiding in performance prediction and failure analysis. Simulations also enable the study of parameter sensitivity, understanding how changes in parameters impact piezoelectric devices. This information helps in making informed design decisions and optimizing the integration of piezoelectric components into larger systems. Furthermore, simulating piezoelectric materials reduces the need for physical prototypes, saving time and costs associated with experimental setups. It enhances the understanding and development of piezoelectric technology, facilitating its widespread application in various industries. In this training package, you will learn what is a piezoelectric, types of piezoelectric, piezoelectric applications, and how to simulate piezoelectrics in Abaqus.

Full Composite fatigue Add-on (Academic and industrial usage)

Original price was: € 1800.0.Current price is: € 1440.0.
This package is designed to instruct users on how to utilize the composite fatigue modeling Add-on, which removes the need to write a subroutine for composite fatigue modeling. Instead, users can select the composite type, input material properties, and generate the subroutine by clicking a button. The Add-on includes four types of composites, and the generated subroutine for all types is the UMAT. These four types are Unidirectional, Woven, short fiber composites (chopped), and wood. The fatigue criteria used for each type are the same as its respective package. For example, the fatigue criteria for woven composites are identical to that used in the "Simulation of woven composite fatigue in Abaqus" package. This Add-on provides a simple graphical user interface for composite fatigue modeling, which can be utilized for both academic and industrial applications.

Full Composite damage Add-on (Academic and industrial usage)

Original price was: € 1800.0.Current price is: € 1440.0.
This package will teach you how to use the composite damage modeling Add-on. The Add-on eliminates the need for writing a subroutine for composite damage modeling. Instead, you only need to select the desired composite type, input the material properties, and click a button. The Add-on will then generate the subroutine for you. The Add-on includes four types of composites: Unidirectional, Woven, short fiber composites (chopped), and wood. The generated subroutine for all types is the VUSDFLD. The damage criteria used in each type is the same as the one used in its respective package. For instance, the damage criteria for the woven composite is identical to the one used in the "Simulation of woven composite damage in the Abaqus" package. This Add-on offers a user-friendly graphical user interface for composite damage modeling, which can be used for academic and industrial purposes.

Forming simulations in ABAQUS

Original price was: € 340.0.Current price is: € 170.0.
  In this training package, different types of forming simulations are presented along with different tips. These points include increasing the solution speed, different types of plasticity and damage models, different solvers, Lagrangian, CEL, and SPH methods and etc.

How to use ABAQUS Documentation


This package teach you how to simulate your customized problem by using help to find similar problems and execute them, theories, using scripts and subroutines and etc.

UEXPAN and VUEXPAN Subroutine


This tutorial teach how to define incremental thermal strains as functions of temperature, predefined field variables, and state variables loads. UEXPAN and VUEXPAN subroutines are used for implicit and explicit solvers respectively.

UGEN Subroutine in ABAQUS


This tutorial is given the shear and bending forces as the output of the subroutine where the shell mechanical behavior is nonlinear and can only be presented on the basis of general terms of the shell matrix and such behavior is not present in the ABAQUS graphical environment.

Fracture simulation in ABAQUS

"UVARM subroutine (VUVARM subroutine) in ABAQUS" package teaches how to specify user-defined output variables at all material calculation points of elements for academic and industrial projects.