ANSYS Training: Non-Linear Analysis

Design engineers often encounter materials, components, and assemblies that exhibit intrinsic nonlinear behaviour in their daily work. The neglect of these nonlinearities may have a significant impact on the precision of simulations. Many engineers, nonetheless, continue to avoid engaging in nonlinear simulation due to the perception that it is excessively intricate and time-consuming. Several years ago, such was actually the situation. The process of establishing and conducting nonlinear simulations required a greater level of expertise and a longer time commitment. Furthermore, there has been a longstanding apprehension about the intricate numerical techniques used to depict nonlinear reactions. Simulation specialists were often responsible for doing nonlinear analysis if it was conducted at all. The previously held beliefs on the complexity of nonlinear simulation have been rendered obsolete due to advancements in finite element analysis (FEA) software and processing technology. Contemporary structural analysis software integrates automated processes and pre-set parameters, facilitating user-friendly execution of nonlinear simulations. The continuous advancement in processing power, seen in both the engineer's personal computer and the server room, has facilitated the feasibility of conducting nonlinear simulations, even for rapid design iterations. Throughout this series of lectures, participants will engage with the fundamental principles of nonlinearity, explore algorithms designed to address nonlinear problems and examine strategies aimed at resolving convergence challenges. In this course, participants will engage in a series of over six sessions aimed at comprehending the finite element analysis (FEA) technique for problem-solving. These workshops will cover various approaches to addressing convergence concerns, resolving such challenges, and exploring industrial applications where nonlinear analysis is useful. We are excited to announce ANSYS Training for Nonlinear Analysis Initiative. The program involves 20 hours of online interactive training sessions and 20 recorded sessions for practice. It is designed to provide comprehensive instruction on nonlinear analysis using ANSYS software. The program covers a range of topics, such as material nonlinearities, contact, large deformation, and more. The training is suitable for engineers and researchers who want to learn how to use ANSYS software for nonlinear analysis. Upon completion of the training, participants will have the skills and knowledge needed to perform complex nonlinear analyses with ANSYS software. After every online interactive session, a recording of the session will be uploaded into the PE-FEA database. This will benefit users who cannot attend the sessions as they can watch the recorded sessions and practice the exercises at their convenience. The program will be conducted through Zoom. For more information on fees and program structure, please contact info@fea.com and dr.joeldaniel@gmail.com.

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Created by Dr.Joel Daniel Last updated Tue, 31-Oct-2023 English
What will i learn?
  • What is the concept of nonlinearity and where may we see its application in real-time engineering applications
  • The issue of convergence in the non-linear problem
  • What are the different kinds of nonlinearity in finite element analysis
  • Factors Influencing Convergence Difficulties
  • Best Practices for Contact Modelling
  • 10 different case studies to help resolve the convergences
  • 6 Exercises: Applications of nonlinear analysis in the real world, focusing on subsea drilling, Matine structures, automobiles, and gas turbines

Curriculum for this course
47 Lessons 00:00:00 Hours
Need for Nonlinear Analysis
5 Lessons 00:00:00 Hours
  • Overview of Non-linear analysis .
  • Solutions to Problems on the Newton-Raphson Method .
  • Relationships: Linear and Nonlinear .
  • Different Types of Non-linearity .
  •  Element Distortion Errors /Excessive forces are distorting elements /Often a corner/singularity situation .
Non-Linear Analysis Procedure in ANSYS
7 Lessons 00:00:00 Hours
  • Preprocessing: Create or import your 3D or 2D geometry using ANSYS DesignModeler or other CAD software. .
  • Material Models: Define material properties, particularly nonlinear material behavior, which may include stress-strain curves, plasticity models, or hyperelastic models. This step is crucial for capturing the nonlinear response of materials. .
  • Meshing: Generate a finite element mesh for your model using tools like ANSYS Mechanical APDL, ANSYS Workbench, or other meshing tools. Ensure your mesh is of sufficient quality for accurate results, especially in areas of expected high stress or deformat .
  • Contacts: If your model involves contact between components, set up contact pairs, friction coefficients, and interaction behavior. ANSYS provides various contact algorithms like frictionless, frictional, and more. .
  • Boundary Conditions: Apply boundary conditions, including displacement, loads, and constraints. Be sure to specify any transient loading conditions or initial conditions for dynamic simulations. .
  • Analysis Settings:Configure the analysis settings, such as convergence criteria, solver options, and control parameters .
  • Postprocessing: After the analysis is complete, examine and interpret the results. ANSYS provides tools to visualize and extract data related to stress, strain, deformation, and other relevant quantities. This data is essential for assessing the behavior .
Factors influencing the problem's convergence: Contact Settings
11 Lessons 00:00:00 Hours
  • Contact Method .
  • Formulations: Contact algorithms .
  • Detection of gaussian points .
  • Symmetry and Asymmetric .
  •  Contact stiffness and penetrations trickling to solve the problems .
  • Resolving geometric interference and bolt preloads using CNOFF .
  • Effect of pinball definition .
  • Working with contact tool .
  • Meshing Techniques .
  • Loading conditions .
  • Analysis settings .
Guidelines for obtaining contact convergence.
9 Lessons 00:00:00 Hours
  •  Understanding the convergence trend through Newton Raphson method .
  •  Understand convergence trends through the Residuals Graph .
  •  DOF Exceeded .
  •  Parts flew away into space: – Contact passed through each other/ Contact didn’t see each other/ Contact slid off one side. Weak springs/Huge Pinball /Contact stabilization / Adjust to touch /Automatic Bisection / Predict for impact .
  •  Too much penetration – Exceeded penetration tolerance value (TOLN) .
  •  Contact Status/Chattering .
  •  Contact Status Keeps Changing / Chattering (cycling of contact status in the loop) / Often visible as NR residual pattern .
  •  Reduce FKN (if penetration allows it) – Reduce time step size – Switch to Symmetric contact (or flip contact/target surface) – Refine the Mesh – Contact Stabilization – Change anything (numerical instability hole) .
  •  Switch to detection at Gauss Points or to Line/Edge contact /Switch to Symmetric or flip contact/target designation / Refine the Mesh / Reduce FKN (if penetration allows it) /Reduce time-step /Use Mixed U-P formulation for underlying elements .
Workshop 1: Case Studies to demonstrate convergence issue and resolve it
8 Lessons 00:00:00 Hours
  • DOF Exceeded at 1st Sub step .
  • Identical Bisections .
  • Small-Time Step Fails .
  • Changing Contact Status .
  • Contact Penetration .
  • Large Plastic Strain Increments .
  • Element Distortion .
  • Solver Methods .
Workshop 2: Material Nonlinear Analysis
2 Lessons 00:00:00 Hours
  • Nonlinear study of high-pressure wellhead connectors exposed to internal pressure, tension, and bending in accordance with ASME section VIII, division 3. .
  • Nonlinear study of a subsea metal-to-metal seal to improve the lockdown capacity .
Workshop 3: Material and Contact Nonlinear Analysis
1 Lessons 00:00:00 Hours
  • Simulation of metallic seal crushing due to bolt pre-load and saleability evaluation as per ASME. .
Workshop 4: Large Deformation Nonlinear analysis
2 Lessons 00:00:00 Hours
  • Linear Buckling analysis of portable offshore units as per DNV .
  • Nonlinear buckling analysis of Storage tank. .
Workshop 5: Contact Non-linearity analysis
2 Lessons 00:00:00 Hours
  • Interference problems .
  • Bolt Preload analysis .
Requirements
  • Mechanical/Civil/ Aerospace working Professionals
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Description

Learnings from the Training

<!--[if !supportLists]-->Ø  <!--[endif]-->What is the concept of nonlinearity and where may we see its application in real-time engineering applications?

<!--[if !supportLists]-->Ø  <!--[endif]-->The issue of convergence in the non-linear problem

<!--[if !supportLists]-->Ø  <!--[endif]-->What are the different kinds of nonlinearity in finite element analysis?

<!--[if !supportLists]-->·        <!--[endif]-->Contact Non-Linearity

<!--[if !supportLists]-->·        <!--[endif]-->Material Non-Linearity

<!--[if !supportLists]-->·        <!--[endif]-->Large deformation non-linearity

<!--[if !supportLists]-->Ø  <!--[endif]-->Factors Influencing Convergence Difficulties

<!--[if !supportLists]-->§  <!--[endif]-->Problems with convergence resulting from modifications to the material model

<!--[if !supportLists]-->§  <!--[endif]-->The convergence of the solution is influenced by the quality of the mesh.

<!--[if !supportLists]-->§  <!--[endif]-->Sequence for loading data to mitigate the convergence problems

<!--[if !supportLists]-->§  <!--[endif]--> The adjustment of contact parameter settings to address convergence concerns.

<!--[if !supportLists]-->Ø  <!--[endif]-->Best Practices for Contact Modelling

<!--[if !supportLists]-->Ø  <!--[endif]-->10 different case studies to help resolve the convergences.

<!--[if !supportLists]-->Ø  <!--[endif]-->6 Exercises: Applications of nonlinear analysis in the real world, focusing on subsea drilling, Matine structures, automobiles, and gas turbines.

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About the instructor
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  • 26 Students
  • 10 Courses
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Dr.Joel Daniel
PYTHAGORAS Engineering and Consultancy offers high-quality instruction in the field of finite element analysis with the Ansys software. A significant number of individuals hailing from various regions throughout the globe have derived advantages from the meticulously designed instructional program. A significant majority, over 90%, of our students successfully get positions inside esteemed firms, using the information acquired via my training program.

Dr. Joel Daniel, a highly esteemed individual with a Master of Technology and a Doctorate degree, has been recognized as a prominent Finite Element Analysis (FEA) Trainer for the last two decades. He is a member of the Indian Society for Technical Education (ISTE), as well as the Institution of Engineers (India) (IEI) and the Institution of Production Engineers (IPE). He serves as a consultant in the field of Finite Element Analysis (FEA), conducts research, and has a position as an academic instructor. He earned his Ph.D. in fatigue and fracture mechanics.


As a scholar, he actively engages in several academic endeavours, such as serving as a teaching faculty member at multiple engineering institutions associated with JNTU. He was employed as an adjunct faculty member at ANURAG Engineering College. Delivered several guest lectures pertaining to modern technologies within the field of mechanical engineering. He had a position as a member of the curriculum board at Vignan engineering institutions. The individual in question has conducted reviews of several national and international publications, as well as provided guidance to a significant number of postgraduate and PhD students, both domestically and internationally. The individual organized Finite Element Analysis (FEA) workshops for esteemed educational institutions such as the National Institute of Technology (NIT), Birla Institute of Technology and Science (BITS) Dubai, and Navajo Technical University in the United States.

The individual has over two decades of research expertise in the fields of gas turbine design, vehicle engineering, and the oil and gas industry, having worked with Textron, GE, and Siemens. The individual employed Finite Element Analysis (FEA) tools, specifically ANSYS, to address intricate issues within various domains. These domains encompass linear and nonlinear systems, composites, structural vibrations (including modal, harmonic, random, and shock load analysis), rotor dynamics (both lateral and torsional), fatigue and fracture mechanics, as well as implicit and explicit analysis. He serves as a consultant for several firms, such as APSCO (USA), TATA HITACHI (JAPAN), HYDRO (US), Sundyne, Premier pumps, Ruhrpumpen, WOM, Word pumps, among others.

The course was developed with the intention of catering to the needs of graduate students seeking to further their careers in the field of Finite Element Analysis (FEA), as well as design engineers who need to enhance their understanding of FEA principles and independently make informed judgments based on FEA results. 

Based on his extensive teaching and research background, he had a comprehensive understanding of the knowledge acquisition process among students inside his educational institution and a keen awareness of the requisite abilities necessary for successful entry into the sector. This served as a source of motivation for him to develop an appropriate curriculum that would bridge the divide between the industry and the educational institution. The curriculum was constructed to allow students to go from foundational concepts to the point where they can solve intricate problems. Numerous individuals from diverse regions around the world derived significant advantages from his instructional sessions, including the incorporation of their own research findings into their Master's and Doctoral dissertations, as well as securing enhanced employment prospects inside reputable organizations. The training program is highly recommended for anybody seeking to transition their career from design to analytical domains. 

Dr. Joel  noted that a significant number of design engineers rely on expertise in finite element analysis (FEA) to make engineering assessments. He always maintains the belief that possessing a shared understanding of design principles and finite element analysis (FEA) is essential for engineers in order to cultivate the creation of efficient and impactful products. This course aims to enhance the comprehension of design engineers about fundamental and advanced principles in Finite Element Analysis (FEA), enabling them to effectively use FEA techniques in the component design process.



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