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Technology

Mercedes-Benz is the world’s first car manufacturer to X-ray a crash test

Mercedes-Benz is the first car manufacturer to carry out an X-ray crash test. Its partner in the X-ray crash test is the Ernst Mach Institute of the Fraunhofer Gesellschaft. In the crash test, all processes in vehicle structures and dummies are visible for the first time. A powerful linear accelerator generates up to 1,000 high-resolution images per second.
Mercedes-Benz is the first car manufacturer to carry out an X-ray crash test. Its partner in the X-ray crash test is the Ernst Mach Institute of the Fraunhofer Gesellschaft. In the crash test, all processes in vehicle structures and dummies are visible for the first time. A powerful linear accelerator generates up to 1,000 high-resolution images per second.
Itumeleng Garebatshabe
Last updated: March 15, 2024 10:02
By Itumeleng Garebatshabe
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  • Technology demonstration: joint project with the Fraunhofer-Society
  • Transparent crash: All processes in vehicle structures and dummies are visible for the first time
  • Powerful linear accelerator: up to 1,000 razor-sharp images per second

The technical sensation begins with a very loud bang. At 60 km/h, a device with a crash barrier rams into the orange C-Class saloon and hits it full on the side. Crash tests are always something special – even for the experts. But the really spectacular part of this side impact test is located in a frame on the hall ceiling above the vehicle: A linear accelerator serves as an X-ray camera. Together with the Fraunhofer-Institute for High-Speed Dynamics, the EMI (Ernst Mach Institute) in Freiburg, Mercedes-Benz has now carried out the world’s first X-ray crash with a real car. On board was one SID II dummy on the left-hand side facing the impact. This is a test specimen with a female anatomy, specially designed for side impact tests.

Contents
Ultrashort X-ray technology: up to 1,000 images per secondCrash tests: Part of Mercedes-Benz’s “Real Life Safety” philosophyAbout the Fraunhofer-Institute for High-Speed Dynamics, the Ernst Mach Institute (EMI)

This technology demonstration (proof of concept) at the EMI research crash facility in Freiburg has shown that high-speed X-ray technology can be used to visualise highly dynamic internal deformation processes. Previously invisible deformations and their exact processes thus become transparent. The numerous, high-resolution images allow precise analysis.

“The Mercedes-Benz X-ray crash sets a milestone in the development tools of the future. With a direct view into the hidden interior, it can help to draw important conclusions for the further improvement of vehicle safety. Mercedes-Benz thus confirms its role as a safety pioneer in automotive engineering.”
Markus Schäfer, Member of the Board of Management of Mercedes-Benz Group AG, Chief Technology Officer

“The successful X-ray crash provides us with valuable insights to further optimize our technology for capturing previously inaccessible information. Fraunhofer EMI is thus consistently pursuing its strategy of using high-speed X-ray imaging to make dynamic processes visible.”
Dr. Malte Kurfiß, Head of Crash Test Centre, Fraunhofer EMI

“The world’s first X-ray crash shows that X-ray technology can provide revealing new insights. We learn what happens inside a vehicle and to the dummies during an accident. The X-ray images also offer the opportunity to further improve the model quality of the digital prototypes.”
Prof. Dr Paul Dick, Director of Vehicle Safety, Mercedes-Benz AG

Ultrashort X-ray technology: up to 1,000 images per second

For several years, the Mercedes-Benz vehicle safety division has been researching the use of X-ray technology in crash tests together with colleagues from EMI. The decisive factor for the breakthrough was the use of a linear accelerator with 1 kHz technology as the radiation source. The device is far more powerful than the X-ray flashes previously used in trials: The photon energy of the linear accelerator is up to nine megaelectron volts. This allows all materials commonly used in vehicle construction to be screened. The duration of the X-ray pulse is only a few microseconds. This makes it possible to record deformation processes in the crash test without motion blur. The linear accelerator also generates a continuous stream of these X-ray pulses. This means that up to 1,000 images per second are possible. That is about 1,000 times as many as with conventional X-ray procedures.

Mercedes-Benz is the first car manufacturer in the world to succeed in X-raying a crash test. And at 1000 X-ray images per second. This is a single X-ray still image from it.

During the crash test, the beams shine through the bodywork and any dummies from above. A flat detector is located under the test vehicle. It serves as a digital image receiver in the X-ray system: When the radiation hits the detector, an electrical signal is generated. The intensity of this depends on how strongly the radiation was previously absorbed by the vehicle and dummy structure. This influences the grey value that is later visible – similar to the X-ray inspection of luggage at the airport or images of this kind taken by a doctor.

In the milliseconds of the actual impact time, the X-ray system shoots around 100 still images. Combined into a video, they provide highly exciting insights into what happens inside safety-relevant components and in the dummy’s body during a crash. In this way, it is possible to observe in detail how the thorax of the dummy is pressed in or how a component is deformed. The important part on the way from research to industrial application is the fact that the X-ray crash does not affect any other analysis tools. Even the interior cameras in the crash test vehicle record without any disturbance.

The EMI experts drew up a comprehensive radiation protection concept for the X-ray crash. Dosimeters are used as monitors to ensure that employees are not exposed to radiation. The government authority has approved the operation of the plant in accordance with legal requirements. The elaborate physical protection measures include an additional 40-centimetre-thick concrete wall around the building and a protection door weighing around 45 tonnes.

Crash tests: Part of Mercedes-Benz’s “Real Life Safety” philosophy

On 10 September 1959, the first crash test in the history of Mercedes-Benz took place – on open ground close to the plant in Sindelfingen. A test car was driven head-on into a solid obstacle. This opened a new chapter in safety research at Mercedes-Benz, as it made it possible to study the crash behaviour of both vehicles and occupants under realistic conditions using test cars and dummies. Together with the analyses of the Group’s own accident research, crash tests form the basis for the “Real Life Safety” philosophy.

Mercedes-Benz currently carries out up to 900 crash tests per year and around 1,700 “sled tests” at the Vehicle Safety Technology Centre in Sindelfingen. In this crash simulation, a test sled is accelerated and braked. A test object (vehicle body shell or assembly) is mounted on the sled and subjected to the forces arising during a real vehicle crash. These sled tests allow non-destructive testing of individual components, especially restraint systems such as seat belts.

And the world’s first public crash test on two fully electric vehicles in autumn 2023 shows that safety at Mercedes-Benz is not a question of the drive system. EQA and EQS SUV models crash into each other in a real accident scenario at a speed of 56 km/h and an overlap of 50 per cent. The test confirms the high level of occupant protection: The passenger cell and high-voltage battery of both vehicles remain intact as intended, the doors can be opened, and the high-voltage systems switch off automatically. Further information here.

About the Fraunhofer-Institute for High-Speed Dynamics, the Ernst Mach Institute (EMI)

The Fraunhofer EMI specialises in the physics, engineering and computer science of fast processes in experiments and simulations. The aim is to develop solutions for industrial applications with a focus on reliability, safety, resilience, efficiency and sustainability.

The Fraunhofer EMI deals with crash, impact and shock wave phenomena across all materials. Adopting a comprehensive approach, the institute analyses and optimises the entire range of materials and microstructures through to complex structures. Applications range from materials to components, cars, aeroplanes, satellites, buildings, urban systems and infrastructure networks.

The Fraunhofer Society is the leading organisation for applied research in Europe. Under its umbrella, 76 institutes and research facilities work at locations throughout Germany. More than 30,000 employees generate an annual research volume of more than 2.9 billion euros.

TAGGED:crash testErnst Mach Institute of the Fraunhofer GesellschaftFraunhofer-SocietyMercedes-BenzX-ray

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ByItumeleng Garebatshabe
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