Aerospace Dynamic Damage and Crashworthiness

Crashworthiness for Aerospace Structures and Hybrids (CRASH) Lab

Introduction

• Why are we working on this project?

• What is the big picture?

Last Year’s work

• What they did• Positive aspects• What needs to be investigated further– What we are doing : composite

Background

• Gantt chart• Target specifications• Mission Statement

Primary Structures

• Fuselage• Wings– Low vs high wings; effect on aircraft

• Empennage• Power Plants– Mention how they come off when plane lands on water

• Undercarriage– Should be discussed in more detail than other– Trigger points

Composites

• Basic structure– Quasi-isotropic– Matrix & Fiber material

• Advantages and disadvantages– Light, strong– Failure mode

Composites(cont’d)

• Relevance to the project– Recent Airplane use composite • (Boeing 787 – 50%)• (Airbus A380 -25%) :GLARE_skin

• Implementation– Strain gages– Hot pressing

Theory and Constrains

• Problems that will be encountered in testing and how they can be overcome using LS Dyna

• Dimensional Analysis – Pi Theorem

• Aerodynamic principles– Design constrains: angle of attach, pitch. Where

the center of pressure, lift, and gravity should be located for a good design

Progress

• Funding– National Instruments, SEC

• Current design of platform and what is being done to change it (improve it)

• Hard vs soft impacts• LS dyna simple models– Ball-Plate (Composite failure)– Cylinder crush (mention undercarriage)

Future Work

• Find more funding• Analyze composition of undercarriage• How to predict undercarriage failure upon a

vertical impact

Conclusion

• Recap– What we are doing– Why we are doing it– How – Funding– Progress and Future work

Team structure

• Team leader• Everybody engage in math base working• Sub-team– ½ in LS-DYNA– ½ in Composite

• Funding (SEC) / Equipment(NI) -> Alex