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Heat and moisture ageing of interior trim components
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

High solar loads, temperatures and humidity levels combine to cause severe exposure conditions for vehicles, especially vehicle interiors. These severe conditions can cause an accelerated ageing of the polymeric, interior material, which, among other factors, can influence component performance, both functionally and aesthetically. This exposure deterioration is a time related process, that goes faster with increased radiation, temperature and humidity. Since a part of the Saab vehicle sales occur in the warm regions of the world, exposure tolerance should be a major design consideration. Interior trim exposure tolerance is a competitive issue in terms of customer satisfaction, and must be addressed. To handle this problem, almost all considerable automotive companies are conducting accelerated weathering tests, outdoor or in laboratory, to predict the material’s lifetime and service performance during severe exposure conditions. A few weeks of accelerated weathering tests can show the same material deterioration as after 10 years of material use. Saab’s accelerated test method for heat and moisture ageing of interior components is not satisfactory, since it is too hard for the materials, difficult to carry through and do not correlate with the natural trials. The aim of this work is to improve the existing test method. To reach the purpose, the preparatory work includes: • an overview of which materials Saab do use for interior trim components • a temperature mapping of the car to see which regions that are most exposed to high temperatures • an investigation of the Saab market and the climate and sales in different parts • a research of what is affecting the choice of the parameters temperature, humidity level and time The results of the preparatory work, together with theoretical research and experimental testing of the trim materials, have ended in a suggestion of two new accelerated test methods that correspond to the Saab demands. The new methods show almost the same material degradation as the earlier method, but they are better from a calibration point of view and will hence be easier to realise, especially in co-operation with the Saab suppliers who did not accept the earlier method. Hopefully, this will result in reduced costs and time-wasting caused by problems with the earlier method, and a good product quality for the Saab clients even in the future.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Material science, ageing, accelerated weathering tests, polymeric materials
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57606ISRN: LTU-EX--02/256--SELocal ID: e42cdd38-6248-407a-bfa6-7f4dffc9563cOAI: diva2:1030994
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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