Advanced
Curing process simulation in Abaqus
Fiber-reinforced composites have found widespread use across various fields due to their remarkable properties. This necessitates a careful design of their manufacturing processes to attain industrial application quality. The critical factor influencing their quality is the curing process, wherein the resin transforms into a solid state under temperature cycles. However, the challenge lies in achieving optimal curing quality while maintaining production efficiency. To overcome this challenge, an effective approach involves utilizing numerical simulations to optimize temperature cycles during curing. Nonetheless, creating such a model is complex as it must consider multiple factors concurrently, including temperature release from chemical reactions, shrinkage strains, and stress resulting from temperature variations, topics covered in this package. The package begins with an introduction to fiber-reinforced composites, exploring their advantages, applications, and categorization. It guides you through the fabrication process, detailing curing techniques and associated challenges. Furthermore, the package introduces constitutive equations for simulating the curing process and the necessary Abaqus subroutines for implementation. Additionally, two practical workshops are included to offer experience in modeling the curing process with Abaqus. These workshops enable you to evaluate internal heat generation and analyze strain and stress distributions. They not only provide guidance on simulation and subroutine implementation but also are provided for verification purposes.
Different Techniques for Meshing in Abaqus
This package introduces different meshing techniques in Abaqus. In finite element analysis, a mesh refers to the division of a physical domain into smaller, interconnected subdomains called elements. The purpose of meshing is to approximate the behavior of a continuous system by representing it as a collection of discrete elements. Meshing is of utmost importance in finite element analysis as it determines the accuracy and reliability of the numerical solution. Through this tutorial, initially, the mesh and related terms associated with meshing are declared. Abaqus mesh module and meshing process are introduced. Then, two different meshing methodologies: Top-down and Bottom-up with meshing techniques available for each one of them are completely explained. Some of the advanced meshing techniques and edit mesh toolset are also included. The consideration of mesh verification as the final step in the meshing process, along with its criteria, is undertaken. All the tips and theories determined in this tutorial are implemented in Abaqus/CAE as a workshop to mesh several parts. This package intends to take your ability to mesh different parts to a higher level.
Creep Analysis in Abaqus
In engineering, creep phenomenon refers to the gradual deformation or strain that occurs in a material over time when it is subjected to a constant load or stress (usually lower than yield stress) at high temperatures. It is a time-dependent process that can lead to the permanent deformation and failure of the material if not properly accounted for in design considerations. Creep analysis is vital in engineering to understand material behavior under sustained loads and high temperatures. It enables predicting deformation and potential damage, ensuring safe and reliable structures. Industries like power generation and aerospace benefit from considering creep for long-term safety and durability of components.
In this training package, you will learn about Creep phenomenon and its related matters; you will learn several methods to estimate the creep life of a system’s components, such as Larson-Miller; moreover, all Abaqus models for the creep simulation such as Time-Hardening law and Strain-Hardening law will be explained along with Creep subroutine; also, there would be practical examples to teach you how to do these simulations.
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.
Simulation of shape control by piezoelectric in Abaqus
Piezoelectricity refers to the accumulation of electric charge in certain solid materials due to mechanical pressure. This phenomenon, known as the piezoelectric effect, is reversible. Some materials exhibit direct piezoelectricity, which involves the internal production of electric charge through the application of mechanical force, while others exhibit the inverse piezoelectric effect.
By harnessing piezoelectrics, it becomes possible to control the geometrical changes of objects in response to external forces. However, it is important to note that utilizing this property in all situations would not be cost-effective. Therefore, it is more practical to use piezoelectric structures selectively, specifically in special applications. One approach to determining the optimal placement of piezoelectric elements for controlling the geometric shape of various objects under internal or external forces involves utilizing the Abaqus and MATLAB software linkage. This software combination, along with optimization algorithms such as the particle swarm optimization algorithm, can be employed to achieve the desired objectives. By leveraging these tools and data, the primary goal of controlling object shape can be successfully accomplished.
In this training package, you will learn about piezoelectric and piezoelectric modeling in Abaqus, the particle swarm optimization algorithm, linking Abaqus and MATLAB, and how to use these tools for shape control.
Notice: Software files and A full PDF guideline (Problem description, theory, ...) are available; Videos are coming soon.
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.
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.
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.
Composite Pressure Vessel simulation in ABAQUS
Pressure vessels are made using different methods today, and one of them is filament winding. This package shows the simulation of composite pressure vessels made using the filament winding method.
In this training package, three winding methods, planar, geodesic, and isotensoid, have been taught for filament winding pressure vessels. In this tutorial, two general methods also have been presented for simulating filament wound pressure vessels. One uses the Abaqus graphical user interface(GUI), and the other uses the Python script. On the other hand, two criteria, Tsai-Hill and Puck, have been used to model damage in the composite. A UMAT subroutine has been used to use the Puck criterion.
Composite pressure vessel analysis with Semi-Geodesic winding
Nowadays, pressure vessels are produced using various methods, one of which is filament winding. This package teaches the simulation of composite pressure vessels produced using the filament winding method. Filament winding itself has different methods, and one of the most widely used winding methods for producing composite vessels is the semi-geodesic filament winding method. In this package, first, the semi-geodesic method is described. Then, the simulation of a semi-geodesic vessel is performed using a Python script. Additionally, a UMAT subroutine is used to simulate the failure of composite materials used in the vessel.
Optimization in ABAQUS
Notice: 2 hours of the package is available now; during 1-month after purchase, it will be completed.
Optimization is a process of finding the best solution to a problem within a set of constraints. It involves maximizing or minimizing an objective function while satisfying a set of constraints. Optimization in Abaqus involves the use of advanced algorithms and techniques to improve the design of structures and systems. Abaqus provides a range of optimization tools, including topology optimization, size optimization, and shape optimization. These tools help in improving the performance of structures by reducing their weight, increasing their stiffness, and minimizing their stress levels. In this package, all types of optimization, such as Topology, will be discussed; after each lesson, there will be workshops to help you to understand optimization with practical examples.
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Ductile Damage Abaqus model for 3D continuum element (VUMAT Subroutine)
In this package, the continuum damage mechanics framework for ductile materials is implemented and developed in ABAQUS by VUMAT Subroutine.
Constitutive modeling is treated within the framework of continuum damage mechanics (CDM) and the effect of micro-crack closure, which may decrease the rate of damage growth under compression, is incorporated and implemented.
The present package has been organized as follows. In the Introduction section, the basis of the CDM in ductile materials is explained, and the applications of the CDM are stated. In the Theory section, the CDM model formulation is briefly reviewed, and with micro-crack closure, the effect is described. In the Implementation section, an algorithm for the numerical integration of the damage constitutive equations is presented. In the VUMAT Subroutine section, the flowchart of the subroutine, and the subroutine structure, step by step, are explained in detail. How to run the VUMAT Subroutine in ABAQUS will be presented in this section. In the Verification section, the validation and verification of the numerical implementation will be evaluated, and the stability, convergence and accuracy of the results will be investigated. In the Application section, the applications of using the ductile damage model in mechanical processes are presented, and the prediction of damage growth and failure in mechanical processes is investigated.
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.
Hardening plasticity in Abaqus
In this package, hardening plasticity in the Abaqus software using Abaqus material models or UMAT subroutine or UHARD subroutine is discussed. It should be mentioned using a subroutine to define hardening could be more professional and this package tries to familiarize users with these subroutines for hardening definitions. So, if you want to write these subroutines for your customized project in the hardening plasticity field, I recommend you the "UMAT Subroutine (VUMAT Subroutine) introduction" and "UHARD Subroutine (VUHARD Subroutine) in ABAQUS".
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Additive manufacturing simulation with Abaqus AM modeler plugin
3D printing is the layer-by-layer creation of three-dimensional objects using materials such as plastic or metal, based on a digital design. Simulation of the 3D printing process involves software that predicts and enhances the printing process for efficient and accurate production. This training package includes the use of the Abaqus AM Modeler plug-in, which allows for selecting the type of 3D printing and conducting the simulation without coding. Two workshops will be taught to master the use of this plug-in: "Sequential Thermomechanical Analysis of Simple Cube One-Direction with LPBF 3D Printing Method Using the Trajectory-Based Method with AM Plug-In" and "3D Printing Simulation with Fusion Deposition Modeling and Laser Direct Energy Deposition Method with AM Plug-In".
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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Additive manufacturing simulation with Abaqus subroutine & python | Inherent Strain Method
3D printing is a technique for creating three-dimensional objects by layering materials such as plastic or metal based on a digital design. 3D printing simulation involves the use of software to predict and enhance the printing process, resulting in more efficient and precise production. This training package is based on the use of subroutines and Python scripting. Following an introduction to the 3D printing process, this method with all its details is explained. Two workshops are then conducted for this method. The first workshop covers 3D printing simulation of a gear with a uniform cross-section, while the second workshop covers a shaft with a non-uniform cross-section.
Simulation of woven composites damage in Abaqus
Woven composites are net-shaped composite structures that are fully interconnected by their yarns. Like a piece of cloth, the yarns are weaved together as warp and weft to create a composite structure. This package includes several components. First, it begins with an introduction to woven composites. Next, it provides a detailed explanation of macro modeling and offers guidance on how to perform it. The damage criteria employed in this package is a modified version of the Hashin criteria specifically designed for woven composites. Furthermore, the package demonstrates how to model damage using the USDFLD subroutine and Hashin relations. The subroutine is thoroughly explained, line by line, and a workshop is conducted to facilitate learning and practical application. Finally, the subroutine's validity is confirmed through a verification process.
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.
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.
Simulation of woven composite fatigue in Abaqus
The training package focuses on simulating woven composite fatigue using Abaqus software and the modified Hashin fatigue damage model based on the article titled "Life prediction of woven CFRP structure subject to static and fatigue loading ". Woven composites have high strength and stiffness-to-weight ratios, but the interlacing pattern can affect stress distribution and damage mechanisms, making fatigue analysis crucial. The package includes four lessons covering different types of composite fatigue models, material characterization, generalization of the failure model, and the implementation of the UMAT subroutine. Two workshops provide hands-on experience in implementing the UMAT subroutine on one element in cyclic tension and a complex model. Fatigue analysis predicts material behavior under cyclic loading and helps design safe and reliable structures.
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