Towards a new definition of areal surface texture parameters on freeform surface: Re-entrant features and functional parameters

•A method to compute the hybrid and functional roughness parameter is presented.•Two surface reconstruction methods are investigated: Bezier surfaces and triangular meshes.•The comparison with the texture parameters defined in the ISO 25178-2 is analysed.•The method can be applied to meshes measured...

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Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2019-07, Vol.141, p.442-459
Main Authors: Pagani, Luca, Townsend, Andrew, Zeng, Wenhan, Lou, Shan, Blunt, Liam, Jiang, Xiang Qian, Scott, Paul J.
Format: Article
Language:English
Subjects:
Additive manufacturing
Approximation
CAD
Computer aided design
Freeform surface
Hydrophobic surfaces
Measurement
Measuring instruments
Parameters
Re-entrant features
Shape recognition
Studies
Surface characterisation
Surface layers
Surface roughness
Texture
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Summary:•A method to compute the hybrid and functional roughness parameter is presented.•Two surface reconstruction methods are investigated: Bezier surfaces and triangular meshes.•The comparison with the texture parameters defined in the ISO 25178-2 is analysed.•The method can be applied to meshes measured using computed tomography.•The proposed method is suitable for additive manufacturing parts. Characterisation of freeform surfaces is an increasingly importance area of metrology. Currently the characterisation of surfaces is performed using data that can be represented by a height map. Modern measurement devices allow the acquisition of surfaces with complex shapes that cannot properly be analysed using the current texture parameters definition. In this paper a method to characterise both freeform surfaces and surfaces with re-entrant features is proposed. Two surface approximation methods are investigated: triangular mesh and Bézier surface. The proposed method will be compared with a method able to extract the ISO 25178-2 areal texture parameters from a triangular mesh.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2019.04.027