Brittle Damage in Abaqus | Brittle Cracking Abaqus
Brittle materials, such as ceramics, glass, and concrete, break or fracture easily under stress without extensive deformation. Unlike ductile materials, brittle materials snap suddenly, lacking the flexibility to rearrange their atomic structure under strain. These materials have low tensile strength but strong compressive resistance, making them vulnerable to brittle cracking Abaqus simulations when stretched or pulled.
Understanding brittle material damage is crucial in safety-critical fields like civil engineering, aerospace, and manufacturing, where unexpected fractures can lead to catastrophic failures. Simulations help engineers predict when and how brittle materials may break, guiding safer design choices. Brittle cracking Abaqus can be modeled using various methods, including the Johnson-Holmquist (JH) model, XFEM, and energy-based approaches, each suited to different types of loading conditions.
For dynamic, high-strain applications like impacts, the JH model is effective, particularly in Abaqus/Explicit with specific damage parameters. For general crack modeling, XFEM is versatile, allowing cracks to form naturally without predefined paths. The energy-based method is useful for slow-loading scenarios, defining an energy threshold for fracture initiation. Each method requires careful input of material properties, mesh refinement, and load conditions to reveal potential failure points and improve material performance in real applications.
Concrete Damage Plasticity Simulation of FRP-Confined Concrete Columns in Abaqus
This tutorial package provides a comprehensive guide to implementing USDFLD subroutine in the context of Concrete Damage Plasticity Material Model. The tutorial focuses on key modeling aspects such as definition of concrete material properties using Concrete Damage Plasticity (CDP) Model. A theoretical background of the model will be presented and detailed explanation of the definition of all material properties will be given. The package will also explain the usage of the USDFLD subroutine to modify concrete material properties dynamically during simulation. Examples of implementing USDFLD in the context of CDP will be presented with focus on material properties that vary in function of pressure and axial strain defined as field variables.
All other modeling details will also be explained including boundary conditions, meshing, loading, and interactions.
By following the detailed steps in this tutorial, you will be able to create and analyze advanced FEM simulations in Abaqus with a focus on concrete having properties that vary during simulation.
Damage Prediction in Reinforced Concrete Tunnels under Internal Water Pressure
This tutorial package equips you with the knowledge and tools to simulate the behavior of reinforced concrete tunnels (RCTs) subjected to internal water pressure. It combines the power of finite element (FE) modeling with artificial intelligence (AI) for efficient and accurate analysis. The Taguchi method optimizes the number of samples needed for FE analysis, and this method is used with SPSS after explanation its concept.
By leveraging Artificial Intelligence (AI) techniques such as regression, GEP, ML, DL, hybrid, and ensemble models, we significantly reduce computational costs and time while achieving high accuracy in predicting structural responses and optimizing designs.
In this tutorial, we explore the hygrothermal degradation composites using ABAQUS, a powerful tool for parallel finite element analysis. Industries like aerospace, marine, and automotive heavily rely on these composites due to their high strength-to-weight ratio and versatility. However, long-term exposure to moisture and temperature can degrade their mechanical properties, making an analysis of hygrothermal effects on composite materials essential for ensuring durability.
ABAQUS allows precise modeling of these environmental conditions through Python scripts and Fortran subroutines. This combination enables efficient simulations across multiple processors, offering insights into key elastic properties, such as Young’s modulus and shear modulus, under varying conditions. By leveraging the ABAQUS Python Scripting Micro Modeling (APSMM) algorithm and custom subroutines, engineers can predict the long-term performance of fiber-reinforced composites, optimizing design and enhancing material performance in critical sectors like aerospace and marine.
In the present Abaqus tutorial for parallel finite element analysis, we have presented the software skills that a person needs when he wants to perform a parallel finite element analysis such as a micro-macro scale analysis. The Abaqus tutorial for parallel finite element analysis covers all you need to write a python scripting code for noGUI environment and also Fortran code for the subroutine environment of Abaqus to execute a parallel finite element analysis via Abaqus software. You can download the syllabus of this package here.
Scaled Boundary Finite Element Method (SBFEM) Modeling Files for ABAQUS
The Scaled Boundary Finite Element Method (SBFEM) enhances traditional Finite Element Analysis (FEA). It provides flexibility in handling complex geometries and interfaces. Integrated into ABAQUS, SBFEM allows for the creation of polyhedral elements, reducing meshing challenges. It effectively manages non-matching meshes and complex boundary conditions, particularly in interfacial problems like contact mechanics and fracture analysis. ABAQUS supports custom user elements (UEL), enabling direct integration of SBFEM with advanced solvers, improving efficiency and expanding its applicability to complex engineering problems. The open-source implementation allows for customization, making SBFEM in ABAQUS a powerful tool for precise and efficient simulations. This is particularly beneficial in scenarios requiring advanced FEA.
Glass Fracture Analysis with Abaqus | Post-Fracture
This tutorial explores a finite element method (FEM) simulation using Abaqus to analyze the post-fracture behavior of structural glass members retrofitted with anti-shatter safety films. It focuses on simulating the vibration response of cracked glass elements under repeated impacts and temperature gradients, contributing to a comprehensive glass fracture analysis, following the methodology outlined in the research article "Effects of post-fracture repeated impacts and short-term temperature gradients on monolithic glass elements bonded by safety films".
Key aspects include modeling glass fracture, assigning material properties, and defining boundary conditions to assess the vibration frequency and load-bearing capacity of cracked glass members. Additional topics cover dynamic identification techniques, performance indicators for glass retrofit efficiency, and frequency sensitivity analysis under various operational and ambient conditions. The simulation results help quantify the residual strength of safety films in post-fracture scenarios, providing a robust framework for structural engineers to extend this investigation to other glass configurations.
This tutorial is ideal for users who want to understand FEM modeling in Abaqus and perform detailed simulations involving complex material interactions, with a focus on practical applications in glass retrofit technology.
An Efficient Stiffness Degradation Composites Model with Arbitrary Cracks | An Abaqus Simulation
Seismic Analysis in Post-Tensioned Concrete Gravity Dam Design Using Abaqus Subroutines
Fiber-based Model for High-Strength Steel Beam Analysis with Abaqus
Advanced Finite Element Analysis of Off-Axis Tunnel Cracking Laminates
Abaqus shaft slip ring simulation | Using Python scripts for parametric analysis
3D Simulation of Gurson-Tvergaard-Needleman (GTN) Damage Model
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.
Creep is one of the most significant failure modes in many components where the working temperature and stresses are high for a prolonged period of time. Existing creep models in commercial analysis software like Abaqus are not adequate to model all stages of creep namely – primary, secondary, and tertiary stages. Theta projection method is a convenient method proven to predict all stages of creep, especially the tertiary stage where strain rates are high leading to internal damage and fracture. The aim of the project is to develop a user subroutine for Abaqus to model creep in components using the Theta projection method. The constitutive model for the Theta projection method based on the accumulation of internal state variables such as hardening, recovery, and damage developed by (R.W.Evans, 1984) is adopted to compile a Fortran code for the user subroutine. The user subroutine is validated through test cases and comparing the results with experimental creep data. Creep analysis of a sample gas turbine blade (Turbine Blade Creep) is then performed in Abaqus through the user subroutine and the results are interpreted.
Results of test cases validate the accuracy of the Theta Projection Method in predicting all primary, secondary, and tertiary stages of creep than existing creep models in Abaqus (Creep Failure in Turbine Blades). Results at interpolated & extrapolated stress & temperature conditions with robust weighted least square regression material constants show the convenience in creep modeling with less input data than existing models. The results of creep analysis not only predicted the creep life but also indicated the internal damage accumulation. Thus, creep modeling of components through the user subroutine at different load conditions could lead us to more reliable creep life predictions and also indicate the regions of high creep strain for improvements in the early stages of design.
Dynamic Response of Rail Track Analysis Under a Moving Load
Railway tracks are subjected to moving loads of trains and this causes vibration and degradation of the track. The judgment of these vibrations is important to design the railway tracks. Therefore, the rail track analysis become important. The design involves the permissible speed of trains and the maximum axle load of the train. The model given here creates a 3D geometry of a railway track and applies a moving load in the form of a wheel. A user can change the speeds and the properties of the material including geometry as per their needs.
continuously reinforced concrete pavement (CRCP) Analysis
|
The increasing adoption of continuously reinforced concrete pavement (CRCP) in highway pavement design is driven by its demonstrated superior performance. Critical to evaluating the long-term effectiveness of CRCP is the understanding of early-age cracks, which has garnered significant interest from highway departments. This Abaqus Continuously reinforced concrete pavement modeling project aims to establish precise design parameters for CRCP and analyze the formation of crack patterns. By accounting for stress factors such as environmental conditions and CRCP shrinkage modeling, the project offers valuable insights into predicting the likelihood of crack initiation and propagation within the concrete slab. These insights are instrumental in enhancing the durability and performance of CRCP structures, thus advancing the efficiency and effectiveness of highway infrastructure. |
Damage Properties of Thermoplastic Polymers with UMAT Subroutine
Abaqus for Civil Engineering Part-1
Modeling Functionally Graded Materials (FGMs) in ABAQUS
Composite Pressure Vessel simulation in ABAQUS
Composite pressure vessel analysis with Semi-Geodesic winding
Full Composite fatigue Add-on (Academic and industrial usage)