Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Crash safety in rail vehicles

03.03.2008
A group of structural engineers at Vienna University of Technology (TU) are working on simulating the behaviour of weld seams under crash loading.

Particular emphasis is being placed on rail vehicles where, on the one hand, improved crash safety is being demanded and, on the other hand, only a limited number of real crash tests can be performed due to the high costs involved. Simulation models are to allow an improved assessment of the failure of welds in the future.

At present, crash tests represent the state of the art not only in the automobile industry but also in the rail vehicle sector. In the course of a cooperative project with Siemens Transportation Systems TU researchers investigated the strength of weld seams in rail vehicles under crash loading as part of a research project funded by the city of Vienna (ZIT). “During collisions not only individual structural components but also the joints between them are exposed to enormous loads. Spot welds play an important role in the crash behaviour of motor vehicles, whereas rail vehicles tend to employ continuous weld seams. Both can be critical in the event of a collision”, notes Helmut Böhm, Head of the Institute of Lightweight Design and Structural Biomechanics of Vienna University of Technology (TU).

The reason why welded joints may be subject to failure lies in the thermal conditions they are subjected to during welding. The metal is heated and molten, which can significantly modify its properties. With the aid of computer simulations professor Böhm and project assistant Christian Grohs studied the inhomogeneous and heat affected material involved in weld seams. “The objective is to enable the structure to absorb as much kinetic energy as possible during a crash. It is constructed in such a way that it can be severely deformed, e.g. by developing patterns of folds. This reduces the risk of injury for passengers”, says Helmut Böhm. Christian Grohs adds: “An extensive experimental test programme, which forms the basis for numerical analysis, was defined and carried out in cooperation with the Institute of Materials Sciences and Technology. We can then recheck the test results and construct better models using this data. The test structure was defined in such a way that the weld seams are located at the most unfavourable positions with the aim of inducing them to fail during the test. The models, in turn, serve to improve the design of rail vehicles”.

A new standard on the collision safety of rail vehicles is to be introduced in 2008. Since crash tests of rail vehicles are very expensive, simulations play a major role in verifying their crash behaviour. Such work must demonstrate that gross deformations of rail vehicles are restricted to so-called crash zones which are situated in regions where there are no people. Dr. Seitzberger, crash expert at Siemens Transportation Systems, states: “An intensive basic research-oriented debate on the issue of the passive safety must be regarded as essential for successfully carrying out future projects. The present cooperation represents a significant contribution to the continued development of know-how and competence in this field and will contribute to enhancing the safety of modern rail vehicles”.

Daniela Hallegger | alfa
Further information:
http://www.tuwien.ac.at/pr

More articles from Transportation and Logistics:

nachricht Laser rescue system for serious accidents
29.11.2016 | Laser Zentrum Hannover e.V.

nachricht Bremen University students reach the final at robotics competition with parcel delivery robot
19.10.2016 | BIBA - Bremer Institut für Produktion und Logistik

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

NTU scientists build new ultrasound device using 3-D printing technology

07.12.2016 | Health and Medicine

The balancing act: An enzyme that links endocytosis to membrane recycling

07.12.2016 | Life Sciences

How to turn white fat brown

07.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>