Training in. Blast and Penetration Using LSDYNA. Course Notes Developed & Presented by Al Tabiei MPSE. Copyright by A.

Transcription

1 Training in Blast and Penetration Using LSDYNA Course Notes Developed & Presented by Al Tabiei MPSE 1

2 About A. Tabiei Dr. Tabiei has been a consultant on the use of large scale finite element simulation for more than 20 years to more than 60 large and small companies and government labs in the US and abroad. He was the director of the Center of Excellence in DYNA3D Analysis at the University of Cincinnati ( ). His primary work focus is in the area of multi-physics simulations, crash simulation, impact simulation, and material model development for isotropic and composite materials. Dr. Tabiei lectures nine different short courses to many government and industrial research centers and companies nationally and internationally on the use of LSDYNA for various applications. He also does code development for LSTC. He was consultant to the US government on the use of simulation for the design of weapons of mass destruction. He was also on a NASA team for the return to the moon program to investigate different landing scenarios ( ). He has a BS in Mechanical Engineering, MS in Aeronautical Engineering from the Wichita State University, MS in Mathematics, and a PhD in Aerospace Engineering from the University of Cincinnati. Dr. Tabiei s expertise is in the area of computational mechanics and numerical simulation. 2

3 Previous Course Customers 1. The Army Research Lab, Aberdeen proving ground, USA 2. The Army Research Lab, Weapons and Material Directorate, USA 3. The Air-force Research Lab, Ammunition Directorate, Eglin Air-force Base, USA 4. BAE Systems, Santa Clara, USA 5. ETA Engineering, USA 6. US Army Corps of Engineering, Waterway Station, Vicksburg MS, USA 7. Alyotech corporation, Paris, France 8. TU Dleft Research Center, Dleft, the Netherland 9. Tubitak, Marmara Research Center, Istanbul, Turkey th LSDYNA European Conference, Strasbourg, France 3

4 SHORT COURSES TOUGHT BY Al TABIEI 1. Intro LSDYNA (2 days or 3.5 days) (Introduction to Explicit FE Simulation) 2. Advance Impact Course Using LSDYNA (2 days) (Comprehensive Explicit FE options for crash and impact) 3. Material Modeling and User Defined Options (2.0 days) (strain rate effect, plasticity, hyperelasticity, viscoelasticity, composites, etc.) 4. Implicit LSDYNA and Springback (2.0 days) (Implicit FE Formulation and multi-step simulations) 5. Multi-Physics LSDYNA (2.5 days) (Thermal-Structural) (Fluid Structure Interaction) (Fluid/structures/thermal Interaction, Acoustics) 6. Composite Materials (2.0 days) 7. Contact in LS-DYNAS (2.0 days) 8. LSYNA dummies (1.0 days) 9. LSDYNA Applications to Protective Structures, Blasts, Vehicle mines, and Home Land Security (2 days) 10 LSPREPOST (geometry and meshing, 2 days) 4

5 ACKNOWELEDGMENTS The author wishes to thank several people for valuable comments and discussions on the notes. Firstly, Dr. J. Hallquist s LSDYNA code is a great help in constructing the lecture notes. Thanks also goes to the LSTC staff for their support and discussions specially Mr. Jim Day. Dr. Ala (Al) Tabiei, Consultant atabiei@aol.com MPSE 4056 Granite Ct. Mason, OH USA These Notes are copyright by Tabiei s Publishing Services. All rights are reserved. 5

6 Outline 1-Introduction Introduction to Wave Propagation Wave propagation in incompressible material Wave propagation in compressible material Numerical Techniques to solve High energy problems Lagrangian Eulerian and ALE SPH EFG Sample applications 2-Blast & Penetration Blast Wave Simulations Techniques Applications: Vehicles Underwater Structures Buildings with Windows 6

7 Outline (continues) 3-Material Behavior Under Sever Loading Strain Rate Effect Material Models Library What is Available That Works for the Defense Problems Isotropic Composites Soil Concrete 4-Failure and Damage Modeling Fracture Damage Element Erosion 5-Hybrid-III Dummy Response to Blast Dummy models Dummy response to blast 7

8 Outline (continues) 6-Blast Mitigation Structures Blast Mitigation Concepts Blast Mitigation Civil/Structures Seat Design for Blast Mitigation 7-Bomb Modeling Shape charges, EFP, & IED Bomb fragmentation modeling 8-Modeling Techniques Mesh design Problem initialization Post-processing 9-Impact Data Reduction and analysis Filtering the data Intermittent eigen value analysis 10-Workshop Several training workshop problems are presented 8

9 Sample Applications IED 9

10 Sample Applications Mine 10

11 Sample Applications Airplan impact 11

12 Sample Applications Blast on pressure vessels 12

13 Sample Applications Dam blast 13

14 Sample Applications Penetration fuse survavibility 14

15 Sample Applications Underwater blast 15

16 Sample Applications Body Armor 16

17 workshops 17