Subroutine
Damage Properties of Thermoplastic Polymers with UMAT Subroutine
Thermoplastic polymers are materials composed of long molecular chains primarily consisting of carbon. These polymers possess the unique ability to be shaped and molded under heat and pressure while retaining their stability once formed. This high formability makes them widely used in various industries, including furniture production, plumbing fixtures, automotive components, food packaging containers, and other consumer products. This package introduces a thermodynamically consistent damage model capable of accurately predicting failure in thermoplastic polymers. The implementation of this model is explained through the use of an ABAQUS user material (UMAT) subroutine.
The package is structured as follows. The introduction section Provides an overview of thermoplastic polymers and their mechanical properties. In the Theory section, the constitutive damage model and its formulation are reviewed. Then, an algorithm for numerically integrating the damage constitutive equations is presented in the Implementation section. In the UMAT Subroutine section, a detailed explanation of the flowchart and structure of the subroutine is provided. Finally, two simulation examples, namely the T-fitting burst pressure test and the D-Split test, are performed and the obtained results, are investigated.
Notice: Software files and A full PDF guideline (Problem description, theory, ...) are available; Videos are coming soon.
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DISP and VDISP Subroutines in ABAQUS
In a very simple form, DISP and VDISP subroutines are used to define user-defined boundary conditions. For example, when you need to define a boundary condition to be time-dependent, location-dependent, or even both, you should use the DISP and VDISP subroutines. ABAQUS features cannot be sufficient for problems with location-dependent and time-dependent boundary conditions simultaneously. In these cases, this subroutine can be useful to solve the challenges. In This package, you will understand the usages of these subroutines and how to work with them in three conceptual and simple workshops.
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Arc welding simulation in Abaqus
Notice: This package will be available one week after purchase.
Arc welding is a fusion process that involves joining metals by applying intense heat, causing them to melt and mix. The resulting metallurgical bond provides strength and integrity to the welded joint. Arc welding is widely used in various industries for fabricating structures and components. Arc welding simulation in Abaqus is essential for optimizing the welding process and ensuring high-quality welds. It allows engineers to predict and analyze factors such as temperature distribution, residual stresses, distortion, and microstructure evolution during welding. By accurately simulating the welding process, parameters like welding speed, heat input, and electrode positioning can be optimized to achieve desired weld characteristics and minimize defects.
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Modeling Functionally Graded Materials (FGMs) in ABAQUS
Dive into the realm of innovative engineering with our comprehensive tutorial package, designed to empower you in modeling Functionally Graded Materials (FGM) using the Abaqus USDFLD subroutine. Uncover the fascinating world of FGMs, materials that ingeniously vary their composition and microstructure, offering a nuanced control over mechanical, thermal, and other properties.
The workshop component takes you on an exploration of crack paths in Spherical Functionally Graded Materials, emphasizing simulation techniques using Abaqus Standard and the USDFLD subroutine. Uncover the secrets of stress distribution within a pressured, empty sphere, and enhance your skills by implementing the XFEM method for precise crack characterization. This training ensures you gain valuable insights into subroutine development, empowering materials engineers and designers to innovate and elevate the performance of structures across various industries. Embark on your journey to mastery with this all-encompassing tutorial package.
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Composite Fatigue Simulation with VUMAT Subroutine in ABAQUS
This training package consists of four chapters that help engineers and researchers in the industry to understand the fundamental concepts and necessary tools for simulating composite fatigue using VUMAT subroutine in ABAQUS. The first chapter provides an overview of the fatigue behavior of composite materials, including the factors contributing to fatigue failure. The second chapter explores the failure mechanisms of composite materials and the types of damage that can occur. The third chapter discusses the effects of fatigue on composite materials, including how it affects the material's properties and performance. Finally, the fourth chapter focuses on using the VUMAT subroutine in ABAQUS for composite fatigue analysis, including the material models and criteria used to simulate the behavior of composite materials under various loading conditions. By mastering the concepts and tools presented in this package, engineers can develop more durable and reliable composite structures that can withstand cyclic loading over extended periods of time.
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Simulation of composite Puck damage in 3d continuum element in Abaqus (UMAT-USDFLD-VUMAT)
The Puck criterion is an essential damage model for composite materials, considering both fiber and matrix failures simultaneously. It provides a practical way to predict the onset of damage in composites under various loading conditions. This training package is focused on simulating composite PUCK damage in 3D continuum elements using UMAT, VUMAT, and USDFLD subroutines in Abaqus. It covers different types of failure in composites, including fiber failure, matrix cracking, delamination, and interfacial failure, as well as criteria for predicting failure modes in composites that are dependent or not dependent on each other, such as the Tsai-Wu and Tsai-Hill criterion, respectively. Additionally, the package covers composites' most commonly used damage criteria, including the Puck criterion. The package provides step-by-step guidance on simulating composite Puck damage using each of the subroutines mentioned above in Abaqus.
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Damage simulation of short fibre composites with subroutine
Short fiber composites consist of chopped fibers and a matrix, forming a discontinuous fiber-reinforced material, with fibers typically positioned either aligned or randomly within the matrix based on the intended application. In this training package, you will learn how to model the short fiber composite (SFC) damage in Abaqus based on this article: “Damage Modeling in Random Short Glass Fiber Reinforced Composites Including Permanent Strain and Unilateral Effect”. In the lesson one, you will learn the fundamentals such as the SFCs advantages, applications, and etc. Moving on to Lesson 2, the focus shifts to modeling Short Fiber Composites in Abaqus. The lesson introduces the critical decision between Macro and Micro modeling, which this package do a macro modeling. Lesson 3 advances the learning journey by exploring damage modeling in Short Fiber Composites, particularly through Dano's model. This macroscopic approach incorporates irreversible processes and internal variables, addressing anisotropic damage, unilateral effects, and residual effects. Lesson 4 bridges theory to practical application, guiding users on how to implement Dano's model in Abaqus through the VUSDFLD subroutine. The tutorial navigates through the subroutine's flowchart, explaining each line sequentially. Complementing the lessons are two workshops. Workshop 1 features a 2D composite plate with a hole using plane stress elements, offering a detailed breakdown of material properties, boundary conditions, and simulation procedures. Workshop 2, mirroring the first, employs shell elements, showcasing variations in element types while maintaining consistency with the utilization of the VUSDFLD subroutine.
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Balsa wood fatigue simulation with Abaqus subroutine
This training package focus on writing subroutines to simulate wood fatigue in Abaqus. In the "Balsa wood fatigue simulation with subroutine" package, the used fatigue theory of wood has been described. Then, the flowchart of the subroutine and writing subroutine line-by-line is explained. It helps users to develop the subroutine based on customized theory. Finally, the subroutine is implemented on the Abaqus model, and the results are discussed.
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Fatigue damage simulation of short fibre composites with subroutine
Fatigue failure in materials occurs when repetitive or fluctuating stresses, below the ultimate strength and often below the yield limit, lead to sudden and unpredictable failure, making it a significant concern in engineering due to its potential for catastrophic consequences. The reinforced part of the fiber-reinforced composites can be categorized as continuous or discontinuous, with the latter referred to as short fiber-reinforced composites. In this training package, the fatigue of short (chopped) fiber composites is explained. Two fatigue damage models are presented for short fiber composites: Nouri fatigue damage model and Avanzini fatigue damage model. The Nouri’s model is applicable for composites with orthotropic behavior. But the Avanzini’s model has considered the fiber distribution in the matrix to be homogeneous and random. It has assumed the material behavior to be isotropic. Also, Nouri's model was developed for strain-controlled test, but Avanzini's model was developed for stress-controlled test. In this tutorial, we use the Avanzini’s model, which is base on this article: “Fatigue behavior and cyclic damage of peek short fiber reinforced composites”. This article has implemented the USDFLD subroutine, but we use the UMAT subroutine, which is more accurate than USDFLD since the material strength and properties reduction is smooth. A standard test specimen is used in this simulation to model such behavior. You will learn the details in the package.
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UMAT Subroutine (VUMAT Subroutine) in ABAQUS-Free Version- UMAT Abaqus example
This package includes the free version of the two following packages. The following packages include 11 workshops for writing different types of subroutines and give you instructions and points to write your own UMAT/VUMAT subroutine. Here, a UMAT Abaqus example is free to download.
"UMAT Subroutine (VUMAT Subroutine) introduction" is used when the material model is not available in ABAQUS software. If you follow this tutorial package, including standard and explicit solver, you will have the ability to write, debug and verify your subroutine based on customized material to use this in complex structures. These lectures are the introduction to writing advanced UMAT and VUMAT subroutines in hyperelastic Martials, Composites, and Metal, and so on. Watch Demo
"Advanced UMAT Subroutine (VUMAT Subroutine)" training package helps Abaqus users to prepare complex UMAT and VUMAT subroutines. This training package is suitable for those who are familiar with subroutine or want to learn UMAT/VUMAT subroutine Professionally. Equations for computational plasticity based on kinematic stiffness are also discussed. In addition, metal damage has been implemented based on Johnson Cook's model. Watch Demo
Simulation of SMA in Abaqus with UMAT
Shape-memory alloys (SMAs) have the ability to recover their original shape, thanks to the shape-memory effect and superelasticity. These unique characteristics have led to the broad usage of SMAs in engineering and medical applications. Simulations offer cost-effective methods for analyzing SMAs’ behavior, ultimately enhancing their reliability and performance. Consequently, researchers frequently employ simulations to investigate SMA-based systems. This educational package begins by exploring the fundamentals of SMA wires, presenting their various types and specific capabilities. It then provides the necessary constitutive equations to describe the behavior of SMAs in simulation. The package includes a flowchart and a step-by-step guide for writing a subroutine to model SMAs in Abaqus. Users will also discover a workshop that uses Abaqus to simulate the superelasticity effect in SMA wires. This workshop not only offers guidance on the simulation and the implementation of the subroutine, but also compares the result with an analytical solution for verification.
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Introduction to VUEL Subroutine in ABAQUS
VUEL is the UEL subroutine for the Explicit solver. UEL is for the Standard solver, and VUEL is for the Explicit solver. Of course, there are some other differences between these two subroutines as well, such as in inputs, variables, etc. This tutorial package is used for writing the most sophisticated subroutines in ABAQUS, VUEL, which are applicable to customized problems. The stiffness matrix and nodal forces are the output of the subroutine, which can be defined based on several variables. This tutorial package contains two workshops: the first is divided into three sections, which model truss elements, and the second workshop explains how to use VUEL and VUMAT subroutines in one model.
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Introduction to USDFLD and VUSDFLD Subroutine
In this usable tutorial, the material properties can change to an arbitrary dependent variable. One of the most important advantages of this subroutine is simplicity and applicability. Various and high usage examples are unique characteristics of the training package.
This training package includes 5 workshops that help you to fully learn how to use USDFLD and VUSDFLD subroutines in Abaqus software. By means of these subroutines, you will have expertise redefine field variables at a material point by the solution dependence of standard and explicit, respectively.
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Abaqus DLOAD Subroutine and VDLOAD Subroutine
This training package helps Abaqus users to prepare complex DLoad and VDLoad subroutines. With the help of these workshops, you can get acquainted with the basic and comprehensive way of DLoad and VLoad subroutine writing and their applications. By viewing this package as an engineer, you can do basic projects with complex loads.
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Module by module Abaqus Training
If you are new to Abaqus software and the topic of finite element analysis, you definitely need to get acquainted with the user interface of this software and the general features of each module.
In this software, we perform different simulation steps in the following different modules and at the end, we receive the analysis results from the software solver.
In this package, you will learn how to work with the software in each module and perform your simulation in each module properly.
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This tutorial teaches you how to define the strain energy of hyperlastic isotropic materials dependent on the field variable or state variable. This Training package including mandatory and optional parameters, and the results of the Subroutine for verification are compared with the ABAQUS results.
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Introduction to VFRICTION and VFRIC Subroutines in ABAQUS
This tutorial help you in cases where the classical Columbian equations are more complex and cannot be implemented by the graphical ABAQUS environment. This package introduces and teaches how to write these two subroutines. This introduction contains explaining different optional and mandatory parameters of VFRICTION and VFRIC subroutines.
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Advanced UMAT Subroutine (VUMAT Subroutine) – Abaqus UMAT tutorial
This training package helps Abaqus users to prepare complex UMAT and VUMAT subroutines. This Abaqus UMAT tutorial package is suitable for those who are familiar with subroutine or want to learn UMAT/VUMAT subroutine Professionally. Equations for computational plasticity based on kinematic stiffness are also discussed. In addition, metal damage has been implemented based on Johnson Cook's model.
Watch Demo
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Introduction to UEL Subroutine in ABAQUS
UEL stands for User-defined Elements. When you have a finite element analysis that requires an element type that doesn't exist in the Abaqus element library, you must write a UEL subroutine. Or, when you want to define various element shape functions, the UEL would be the best choice. This subroutine is one of the most sophisticated in the Abaqus and is intended for advanced users. With this tutorial package, you can become an advanced user and learn how to write such a complex subroutine. This package contains two workshops: writing a UEL subroutine for a planar beam element with nonlinear section behavior and writing a UEL subroutine for a beam element with specific boundary conditions and loading.
Watch Demo
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UMESHMOTION subroutine in ABAQUS
If you want to define motion for mesh nodes, you must use the UMESHMOTION subroutine. This subroutine helps you to specify Mesh Motion constraints during adaptive meshing. In this tutorial package, you will learn when you need to use the UMESHMOTION subroutine and how to use it. This package contains three workshops: “writing UMESHMOTION subroutine in forming process”, “writing UMESHMOTION subroutine in rolling process”, and “Tread wear simulation via UMESHMOTION”. The Archard model is used in the wear process, which is very popular in academic and industrial projects.
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UAMP subroutine (VUAMP subroutine) in ABAQUS
This package introduces UAMP and VUAMP subroutines in Abaqus. The UAMP and VUAMP refer to User-Defined amplitude. In Abaqus, load amplitude refers to the time-varying function that defines the magnitude and pattern of a load applied to a model during analysis. This amplitude can be defined using predefined amplitude functions or by creating a user-defined amplitude using the UAMP or VUAMP subroutines. The load amplitude can be applied to various types of loads including force, pressure, displacement, and temperature, allowing for a wide range of loading scenarios to be simulated in the analysis. The load amplitude plays a critical role in determining the response of the model over time. The UAMP and VUAMP subroutines can be determined by a mathematical time-dependent function or using sensor values that are defined by the user in analysis. In Abaqus, sensors are used to monitor and extract data from a simulation during its execution. In this package, you will learn all about the UAMP and VUAMP subroutines, all of their variables, how to work with them, their differences, and other things along with educational workshops to help you understand working with these subroutines.
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