ISO 25178-2:2021
Geometrical product specifications (GPS) — Surface texture: Areal — Part 2: Terms, definitions and surface texture parameters
This document specifies parameters for the determination of surface texture by areal methods.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 General terms
3.2 Geometrical parameter terms
3.3 Geometrical feature terms
4 Field parameters
4.1 General
4.2 Height parameters
4.2.1 General
4.2.2 Root mean square height
4.2.3 Skewness
4.2.4 Kurtosis
4.2.5 Maximum peak height
4.2.6 Maximum pit depth
4.2.7 Maximum height
4.2.8 Arithmetic mean height
4.3 Spatial parameters
4.3.1 General
4.3.2 Autocorrelation length
4.3.3 Texture aspect ratio
4.3.4 Texture direction
4.3.5 Dominant spatial wavelength
4.4 Hybrid parameters
4.4.1 General
4.4.2 Root mean square gradient
4.4.3 Developed interfacial area ratio
4.5 Material ratio functions and related parameters
4.5.1 Areal material ratio
4.5.2 Inverse areal material ratio
4.5.3 Material ratio height difference
4.5.4 Areal parameter for stratified surfaces
4.5.5 Areal material probability parameters
4.5.6 Void volume
4.5.7 Material volume
4.6 Gradient distribution
4.7 Multiscale geometric (fractal) methods
4.7.1 Morphological volume-scale function
4.7.2 Relative area
4.7.3 Relative length
4.7.4 Scale of observation
4.7.5 Volume-scale fractal complexity
4.7.6 Area-scale fractal complexity
4.7.7 Length-scale fractal complexity
4.7.8 Crossover scale
5 Feature parameters
5.1 General
5.2 Type of texture feature
5.3 Segmentation
5.4 Determining significant features
5.5 Section of feature attributes
5.6 Attribute statistics
5.7 Feature characterization convention
5.8 Named feature parameters
5.8.1 General
5.8.2 Density of peaks
5.8.3 Density of pits
5.8.4 Arithmetic mean peak curvature
5.8.5 Arithmetic mean pit curvature
5.8.6 Five-point peak height
5.8.7 Five-point pit depth
5.8.8 Ten-point height
5.9 Additional feature parameters
5.9.1 General
5.9.2 Shape parameters
Annex A (informative) Multiscale geometric (fractal) methods
Annex B (informative) Determination of areal parameters for stratified functional surfaces
Annex C (informative) Basis for areal surface texture standards — Timetable of events
Annex D (informative) Implementation details
Annex E (informative) Changes made to the 2012 edition of this document
Annex F (informative) Summary of areal surface texture parameters
Annex G (informative) Specification analysis workflow
Annex H (informative) Overview of profile and areal standards in the GPS matrix model
Annex I (informative) Relation with the GPS matrix
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 General terms
3.2 Geometrical parameter terms
3.3 Geometrical feature terms
4 Field parameters
4.1 General
4.2 Height parameters
4.2.1 General
4.2.2 Root mean square height
4.2.3 Skewness
4.2.4 Kurtosis
4.2.5 Maximum peak height
4.2.6 Maximum pit depth
4.2.7 Maximum height
4.2.8 Arithmetic mean height
4.3 Spatial parameters
4.3.1 General
4.3.2 Autocorrelation length
4.3.3 Texture aspect ratio
4.3.4 Texture direction
4.3.5 Dominant spatial wavelength
4.4 Hybrid parameters
4.4.1 General
4.4.2 Root mean square gradient
4.4.3 Developed interfacial area ratio
4.5 Material ratio functions and related parameters
4.5.1 Areal material ratio
4.5.2 Inverse areal material ratio
4.5.3 Material ratio height difference
4.5.4 Areal parameter for stratified surfaces
4.5.5 Areal material probability parameters
4.5.6 Void volume
4.5.7 Material volume
4.6 Gradient distribution
4.7 Multiscale geometric (fractal) methods
4.7.1 Morphological volume-scale function
4.7.2 Relative area
4.7.3 Relative length
4.7.4 Scale of observation
4.7.5 Volume-scale fractal complexity
4.7.6 Area-scale fractal complexity
4.7.7 Length-scale fractal complexity
4.7.8 Crossover scale
5 Feature parameters
5.1 General
5.2 Type of texture feature
5.3 Segmentation
5.4 Determining significant features
5.5 Section of feature attributes
5.6 Attribute statistics
5.7 Feature characterization convention
5.8 Named feature parameters
5.8.1 General
5.8.2 Density of peaks
5.8.3 Density of pits
5.8.4 Arithmetic mean peak curvature
5.8.5 Arithmetic mean pit curvature
5.8.6 Five-point peak height
5.8.7 Five-point pit depth
5.8.8 Ten-point height
5.9 Additional feature parameters
5.9.1 General
5.9.2 Shape parameters
Annex A (informative) Multiscale geometric (fractal) methods
Annex B (informative) Determination of areal parameters for stratified functional surfaces
Annex C (informative) Basis for areal surface texture standards — Timetable of events
Annex D (informative) Implementation details
Annex E (informative) Changes made to the 2012 edition of this document
Annex F (informative) Summary of areal surface texture parameters
Annex G (informative) Specification analysis workflow
Annex H (informative) Overview of profile and areal standards in the GPS matrix model
Annex I (informative) Relation with the GPS matrix
Bibliography