Specialised design problems involving short-duration high-pressure loadings generally require the use of explicit dynamics methods to obtain a good answer within reasonable time scales. These problems generally simulate severe loading and material failure, from events such as impact, blast loading, car crash, etc. Some manufacturing simulations in which there is changing contact between components with the material undergoing vast deformation also use explicit dynamics methods, such as metal forging, sheet metal pressing, etc.
Proving the necessary inputs and checking the results is important but often the real source of errors encountered in the simulation is difficult to determine.
This course provides a basic overview of explicit dynamics simulation methods, briefly describing the theoretical nature together with its software implementation and its advantages and disadvantages. It should help engineers carry out explicit dynamics simulations, ensuring accurate and robust solutions with correct analysis choices avoiding possible pitfalls. It should also help engineers distinguish problems that should be solved explicitly or implicitly, thereby providing the least time to obtain a solution.
Attending will explain the solution steps to carry out an explicit dynamic analysis, some of these being different to standard analyses such as controlling the hourglass modes,assigning damping and optimizing the computer time. Issues related to contact definition and avoiding extreme mesh deformation are also described.
Interaction is encouraged throughout the course. Questions and class participation are encouraged, as this is one of the key aspects of making this a unique and positive experience for each attendee.
NAFEMS, the only vendor neutral, not-for-profit organization with the aim of promoting the effective and reliable use of engineering simulation, provides this course that is completely software independent. Attendees are welcome to bring laptops to take notes but a full set of printed and bound notes will be issued.
The course is completely software independent and attendees are welcome to bring laptops to take notes, but they are not required.
A full set of printed and bound notes will be issued to every attendee.
This course is focussed on simulation techniques used for highly nonlinear, short duration (high velocity) problems involving contact, impact, large deformations, nonlinear materials, etc.
If you have sufficient attendees or a group of potential attendees then a tailor made course may be more suitable and NAFEMS can then work closely with you to cater for your specific industry sector or analysis type.
The course is open to both members and non-members of NAFEMS.
This course is short and combines information, examples, case studies and time for open discussion of the concepts presented.
|DVkn1||State Newton's 2nd Law or, equivalently, the d'Alembert Force Method.|
|DVco25||Discuss the characteristics of mass and damping matrices.|
|DVco30||Discuss the concept of mass and stiffness proportional (Rayleigh) damping.|
|DVco37||Describe the terms Lumped mass matrix and Consistent mass matrix and identify which formulation is appropriate to elements being used.|
|DVco44||Explain the terms Implicit Solution and Explicit Solution for the time integration of the equations of motion and the appropriate associated problem classes of dynamic analyses.|
|DVco47||Contrast mesh density requirements in static and dynamic problems.|
|DVco49||Discuss possible sources of nonlinearity in a dynamic problem.|
|DVco52||Explain why uniform meshes are often advised for shock or wave propagation problems.|
|DVap3||Employ a range of post-solution checks to determine the integrity of dynamic FEA results.|
|DVap7||Employ an analysis system for the determination of transient response in a range of linear and nonlinear systems.|
|DVap10||Employ an analysis system for the simulation of impact.|
|DVap11||Employ an analysis system for the determination of dynamic stresses, where appropriate.|
|DVap13||Illustrate the approximate nature of finite element analysis, through dynamic examples chosen from your industry sector.|
|DVan1||Analyse the results from dynamic analyses and determine whether they are consistent with assumptions made and the objectives of the analysis.|
|DVsy1||Prepare a dynamic analysis specification, highlighting any assumptions relating to geometry, mass distribution, loads, boundary conditions, damping, and material properties.|
|DVsy2||Plan a dynamic analysis, specifying necessary resources and timescale.|
|DVsy3||Prepare quality assurance procedures for dynamic finite element analysis activities within an organisation.|
|DVev1||Select appropriate idealisation(s) for components / structures, which are consistent with the objectives of the dynamic analyses.|
|DVev2||Assess the significance of neglecting any feature or detail in any dynamic idealisation.|
|DVev3||Assess the significance of simplifying geometry, material models, mass, loads or boundary conditions and damping assumptions on a dynamic analysis.|
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