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Evaluation and Visualisation of Surface Defects – - a Numerical and Experimental Study on Sheet-Metal Parts

In English

Författare

  • Alf Andersson

Summary, in English

The ability to predict surface defects in outer panels is of vital importance in the automotive industry, especially for brands in the premium car segment. Today, measures to prevent these defects can not be taken until a test part has been manufactured, which requires a great deal of time and expense. The decision as to whether a certain surface is of acceptable quality or not is based on subjective evaluation. It is quite possible to detect a defect by measurement, but it is not possible to correlate measured defects and the subjective evaluation. If all results could be based on the same criteria, it would be possible to compare a surface by both FE simulations, experiments and subjective evaluation with the same result.In order to find a solution concerning the prediction of surface defects, a laboratory tool was manufactured and analysed both experimentally and numerically. The tool represents the area around a fuel filler lid and the aim was to recreate surface defects, so-called "teddy bear ears". A major problem with the evaluation of such defects is that the panels are evaluated manually and to a great extent subjectivity is involved in the classification and judgement of the defects. In this study the same computer software was used for the evaluation of both the experimental and the numerical results. In this software the surface defects were indicated by a change in the curvature of the panel. The results showed good agreement between numerical and experimental results. Furthermore, the evaluation software gave a good indication of the appearance of the surface defects compared to an analysis done in existing tools for surface quality measurements. Since the agreement between numerical and experimental results was good, this indicates that these tools can be used for an early verification of surface defects in outer panels. ©2005 American Institute of Physics

Publiceringsår

2005

Språk

Engelska

Sidor

113-118

Publikation/Tidskrift/Serie

NUMISHEET 2005: Proceedings of the 6th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Process (AIP Conf. Proc)

Volym

778

Dokumenttyp

Konferensbidrag

Förlag

American Institute of Physics (AIP)

Ämne

  • Materials Engineering

Conference name

6th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Process

Conference date

2005-08-15 - 2005-08-19

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 0-7354-0265-5