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Therefore, each method extracts some important Guide to Load Analysis for Durability in Vehicle Engineering, First Edition. Edited by P. Johannesson and M. Speckert. © 2014 Fraunhofer-Chalmers Research Centre for Industrial Mathematics. 1 Measured service loads durability feature of the load. The different methods reduce the load information in different ways and to different degrees, suitable for different situations. However, before going into details of load analysis one has to ensure that the data to be analysed are correct.

Lack of durability is not only a problem for customers, also the producers suffer. Failures reduce company profitability through call-backs, warranty costs and bad will. In other words, good durability leads to good quality, company profitability and customer satisfaction; see Bergman and Klefsj¨o [22]. In order to make a good durability assessment there are many influences that need to be considered and most of those are not fully known beforehand. 6 showing a schematic view of engineering fatigue design.

125]. The VMEA method is presented at three levels of complexity: basic, enhanced and probabilistic. The basic VMEA can be used when we only have vague knowledge about the variation. The sensitivity and variation size assessments are made by engineering judgements and are usually made on a 1–10 scale. When better judgements of the sources of variation are available, the enhanced VMEA can be used. The probabilistic VMEA can be used in the later design stages where more detailed information is available.