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Simulation and testing of bumper systems subjected to low speed impacts
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Simulation models serves as important tools for SSAB Hardtech under the process of product development of bumper systems. Before the time of delivery, the results from the simulated collisions have to be validated against physical experiments to guarantee the performance of the system. Each test method is strictly defined and the requirements of the response differ between America, Canada and Europe. Until recently, SSAB Hardtech has purchased all the tests from a number of sources. By this time though, the company has built a test center where they can perform the tests on their own. The objectives of this master thesis have been to investigate the correlation between tests and simulations of a Ford Focus bumper system mounted to a rigid test sled. Secondly, to build a dynamic module that can be mounted to the test sled to investigate how well the relative motion between the moving mass and the test sled is correlated to simulations. Thirdly, how the moving mass affects the overall results for this specific bumper system and one specific load case. The simulation model has been created in I-DEAS 10 NX and LS-DYNA has been used as solver and post processor. The simulated and tested load case is described by a rigid flat wall and the velocity has been 5 and 8 km/h. Simulations and tests have been performed for the sled with a rigid mass of 800 and 1050 kg. It has also been tested with a dynamic mass of 250 kg mounted on the sled with a rigid mass of 800 kg. The motion of the test sled and the dynamic mass are described with the signals from the accelerometers. In the front of the test sled, load transmitters measure the force from the barrier during the collision. From a general point of view, the level of the maximum force is higher in the simulations compared to the results from the tests. Even the slope of the ramp-up of the force is higher for the simulated case. Better correlation between simulations and collision tests is achieved when the force is derived from the accelerometer signal compared to the case of measuring the force with the load transmitters in the front. The resulting displacement of the dynamic mass relative to the test sled is well correlated between tests and simulations. For the Ford Focus system, the influence of the dynamic mass is small but with a softer system, the dynamic mass will have a larger effect on the overall result.

Place, publisher, year, edition, pages
2004.
Keywords [en]
Technology, simulations, testing, experiments, mechanical, impacts, collisions, FEM
Keywords [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-53081ISRN: LTU-EX--04/108--SELocal ID: a28ba0c7-1822-4ea9-87c3-a1775d87f02eOAI: oai:DiVA.org:ltu-53081DiVA, id: diva2:1026454
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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