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2-Day Workshop On Dynamic Material Behaviour Part 1: Testing at Highest Rates and Theory, 27 & 28 Mar 17 (For NTU Staff and Students only. Registration Full and Closed)​

Published on: 03-Mar-2017


Dates: 27 & 28 March 2017 (Monday and Tuesday)

Day 1: 9.00 am – 4.45 pm, (Registration starts at 8.45 am)
Day 2: 9.00 am – 4.00 pm

Venue: EST Lab 1 (N1-B2b-13), School of Civil & Environmental Engineering, Nanyang Technological University

Course Instructor: Prof. Dr.-Ing. Werner RIEDEL, Deputy Head of Impact Physics Dpt. Ernst-Mach-Institut (EMI), Fraunhofer Society, Freiburg, Germany

Organised by: Protective Technology Research Centre, School of Civil & Environmental Engineering, College of Engineering, Nanyang Technological University

Registration Link :https://wis.ntu.edu.sg/pls/webexe/REGISTER_NTU.REGISTER?EVENT_ID=OA17022714514830 (For NTU Staff and Students only. Registration full and closed)

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OUTLINE

Material descriptions for predictive simulations of transient dynamic processes (e.g. crash, shock loading and impact) require a broad knowledge of experimental, analytical and numerical basics, such as:


  • Theory of equation of state for solid materials

  • Wave propagation analysis of dynamic triaxial deformation processes

  • Static and dynamic experimental characterisation procedures

  • Suitable state-of-the-art and development stage material models

  • Governing equations and suitable discretisation for large deformations, failure and post-failure behaviour


A four-day workshop focused to anchor and broaden these basics in view of predictive simulation capabilities for scientists and engineers has been developed over the last decade by scientific staff of Ernst-Mach-Institut. It is structured into two sessions of two days each:


  • Dynamic Material Behaviour Part I: High Rate Testing and Theory

  • Dynamic Material Behaviour Part II: Simulation of Metals, Concrete and Composites


Part I focuses on the phenomenology of the dynamic behaviour of materials, the testing methods and theories for description in constitutive models. Necessary basics on mechanics of materials and continuum mechanics are slowly introduced and kept at a pragmatic level. Chosen testing and modelling procedures are being prepared as hands-on examples and exercises. Part I is designed with the conclusion section (part 00) to be useful as a stand-alone course. Part II of the course is scheduled for August 2017.

CONTENT


Day 1 Day 2

Part I: Introduction

- Fraunhofer, EMI, Presenter

- Strain rates in applications, Exercise 1

- Global/local instability, Optical strain measurements

- Exercise 2: Dynamic instability


Part II: Dynamic Stress Wave Analysis

- 1D Elastic stress wave, Hopkinson-Bar, Taylor-Test

- Exercise 3: Taylor-Test with Hydrocode


Part III: Constitutive Models of Dynamic Strength

- Eq. stress and strain, Flow potential

- Constitutive Models of dynamic strength

- Exercise 3b: Strain and strain rate hardening, Failure


Part 0: Repetition

- Key findings and contexts from Day 1


Part IV: Shock Waves in Solids

- Compression/shock wave, plate impact, contact detonation

- Deriving the equation of state

- Direct/ inverse plate impact, Lagrange & X-t-Diagram

- Exercise 4: Simulating plate impact tests


Part 00: Conclusion

- Chosen Applications

- Summary

- Outlook on Part II of the Course: Simulation of metals, concrete and composites


ABOUT THE INSTRUCTOR

Professor Werner RIEDEL (born 1970) is Deputy Head of the Impact Physics Department at EMI. He received degrees in Mechanical Engineering from the Technical Universities of Munich (1994) and Compiègne, France (1996). At EMI he specialised in numerical modelling of materials and components under dynamic loads. In 2000 he received the doctoral degree at the University of the German Armed Forces at Munich (modelling concrete, RHT).

Among the numerous projects (>100) with his contributions are industrial and public customers such as EADS, ESA, European Commission, BMW, Areva. Prof. Riedel published 103 scientific publications (1996 – 2017). He was twice invited as Visiting Professor to Tokyo Tech (2006/2010) and is Professor at Furtwangen University in ‘Security & Safety Engineering’ since 2011. He currently holds the position of a Visiting Associated Professor at NTU-PTRC.

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