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How to design spot-weld joints between the side impact beam and the door avoiding cracks in different load cases
2008 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Every year 400 to 500 people in Sweden die and thousands get seriously injured in the road traffic. Traffic injuries are one of the largest health problems. The safety car industry is constantly trying to develop safer cars. The car industry is constantly struggling with the tougher crash impact tests and customers who prefer buying lighter, safer and less expansive vehicles. There are different ways of constructing safety components in a car. One way is hot forming, which means that a sheet of material gets heathen and after the material gets pressed in one stamp fast cooling will make the material strong. Hardtech Gestamp is a leading company in hot forming process. The side of the car has several kinds of beams to prevent the passenger in the cars to get injured. One of those beams is the side impact beam that is placed in the doors. The side impact beam’s purpose is to lead the absorbed energy from the impact to the stronger pillars on the side of the beams. The side impact beams are usually attached to the body of the car with spot welds. If these spot welds will get an unwanted load case they will crack during the impact, witch means that the side impact beam will not have any effect. New cars will have to go through various impact tests. One example of such a test is where a trolly hits the side of a car from different angels. Another example, specially customized for the side impact beam is when a pole is pressed in to the front door of the car. A less expansive way of preventing beams and spot welds to crack during an impact than testing in reality is to use data simulations before producing the beam. Most commonly used when calculating how an impact will look like is FEM, finite element method. If using right input data the result will resemble a real impact. In this thesis investigations on how the spot welds will get affected during simulated side impact tests with different designs of the side impact beam will be done. The result shows that the design of the side impact beam and the position of the spot welds have a large effect on crack appearance.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Teknik, Mekanik, Hållfasthet, Finite element method, Bilar
Keyword [sv]
URN: urn:nbn:se:ltu:diva-53112ISRN: LTU-EX--08/009--SELocal ID: a2e47af4-ae29-4eb3-a948-f374128090e6OAI: diva2:1026486
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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