DLR Portal
Home
|
Sitemap
|
Accessibility
Imprint and terms of use
Privacy
Cookies & Tracking
|
Deutsch
You are here:
Home
:
Examples of research and projects
:
Vehicle Architectures and Lightweight Design Concepts
Advanced Search
Institute
Examples of research and projects
Vehicle systems and Technology Assessment
Alternativ Energy Concepts
Alternative Energy Converters
Vehicle Architectures and Lightweight Design Concepts
Material and Process Applications for Road and Rail Vehicles
Offers
Publications
Archiv
Leichtbautechnologien - Konzepte und Architekturen
Print
Automated material card calibration for crash simulations
The DLR Institute of Vehicle Concepts investigates innovative methods for road and rail vehicle concepts. One research topic is the method development for passive safety applications. In this research field a material laboratory for automated material card development was setup, linking the required material characterizations tests with numerical optimization strategies for the fast and efficient development of validated material cards for crash simulations.
Applied process chain for automated material card generation
Laboratory for automated material card development
Material card development for crash application is a very challenging task due to the complexity of modelling the high non-linear material behavior of materials exposed to crash loads. For an automated material model development process, a material laboratory was built up combining a closed loop between material characterization tests and an automated material card optimization procedure. The material characterization can consist of quasi-static and dynamic coupon tests investigating conditioned material specimens. Thus, temperature, moisture and strain rate depended material descriptions can be derived.
For dynamic testing the IMPETUS® pendulum is used for rate depended specimen loadings. The pendulum is a testing machine, which enables the mechanical characterization of dynamically loaded material specimens or small components under defined uniaxial or biaxial stress states. The experimental data can be directly linked to the optimization environment VALIMAT® which generates an interface between the test data, the explicit simulations environment and a meta-model-based optimizer. Due to the combination of predefined coupon tests and defined interfaces to explicit solvers, numerical material descriptions can be automated calibrated and directly validated by this applied methodology.
Overview on the automated material card development process
V
arious test setups available: bending-, tension bending, dynamic tensile-, puncture- and compression test
Applicable for plastics, composites, foams & aluminum
Strain rate depended measurements with customizable support distance and clamping conditions
Impact speeds between 0.5 up to 4.4 m/s and a maximum impact mass of 5.5 kg [impact energies up to 50 J]
Measurements with digital image correlation [DIC] possible
Application for user-defined material cards and user-defined specimens possible
Automated material calibration for different FE-solvers (LS-DYNA©, Pam-Crash©) available
Test setups for the different dynamic material characterization tests [Source: 4a engineering GmbH]
Contact
Dipl.-Ing. Gundolf Kopp
Forschungsfeldleiter, Head of Research Area
Institute of Vehicle Concepts
Leichtbau und Hybridbauweisen, Lightweight and Hybrid Design Methods
Stuttgart
Tel.: +49 711 6862 593
Fax: +49 711 6862-258
Downloads
ASMOS (Automated Surrogate Modeling for Vehicle Safety)
(0.9 MB)
Automatisierte Materialkartenableitung für die Crashsimulation
(0.61 MB)
Related Topics
Vehicles Structure
Railway Transportation Management
Copyright © 2024 German Aerospace Center (DLR). All rights reserved.