This training course has been accredited by the NAFEMS Education & Training Working Group

10 Steps to Successful Explicit Dynamic Analysis

Duration:	1 day
Delivery:	E-learning Onsite Classroom
Language:	English
Level:	Mid-level
Availability:	Worldwide
Tutor(s):	Gino Duffett
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Understand, implement, and get the most out of explicit dynamic simulation methods.

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.

Course Program

This course combines information, examples, case studies and time for open discussion of the concepts presented.

Brief theoretical background of Explicit Dynamics
Material modelling
Modelling boundaries including contact
Hourglassing and element selection
Time stepping and mass scaling
Simulation considerations
Typical results
Examples in typical sectors distributed throughout the course (e.g. manufacturing, impact, explosion)

Who Should Attend?

This course is focussed on simulation techniques used for highly nonlinear, short duration (high velocity) problems involving contact, impact, large deformations, nonlinear materials, etc.

Interested?

Get in touch to discuss your next steps with our experienced training team. We can work closely with you to understand your specific requirements, cater for your specific industry sector or analysis type, and produce a truly personalised training solution for your organisation.

All NAFEMS training courses are entirely code independent, meaning they are suitable for users of any software package.

Courses are available to both members and non-members of NAFEMS, although member organisations will enjoy a significant discount on all fees.

NAFEMS course tutors enjoy a world-class reputation in the engineering analysis community, and with decades of experience between them, will deliver tangible benefits to you, your analysis team, and your wider organisation.

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PSE Competencies addressed by this training course

ID	Competence Statement
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.