Head Impact on Windscreen -

Modelling and Validation 13th LS-DYNA Forum 2014, Bamberg

Christian Alter1, Jens Schneider2, Stefan Kolling1 1 Institute

2 Institute

of Mechanics and Materials, THM Gießen

of Materials and Mechanics in Civil Engineering, TU Darmstadt

Overview

Glass  Motivation  Experimental setup

PVB Microcrack

 Simulation  Summary

Brittle material glass 13. LS-DYNA Forum 2014, Bamberg

2

Motivation

Motivation  In case of an accident 1. Pedestrian gets hit on his legs 2. Rollover zone 3. Head impact on windscreen or engine hood

 Safety requirements must be fulfilled (e.g. HIC*)

 To keep the developmental period short, exact simulations are needed  Optimization of the simulation of laminated glass in respect of the initial failure and the postbreakage behavior *Head

Injury Criterion: 𝐻𝐼𝐶 = 𝑚𝑎𝑥

1 𝑡2−𝑡1

2.5 𝑡2 𝑎 𝑑𝑡 (𝑡2 − 𝑡1) 𝑡1 𝑟𝑒𝑠

Regulation (EC) No 78/2009

13. LS-DYNA Forum 2014, Bamberg

≤ 1000 Photo: hondanews.com

4

Experimental setup

Experimental setup  Different tests have been done  Quasi static: electric cylinder (0.365m/s) or pneumatic cylinder (