ISO 21920-2:2021
Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms, definitions and surface texture parameters
This document specifies terms, definitions and parameters for the determination of surface texture by profile methods.
NOTE 1 The main changes to previous ISO profile documents are described in Annex I.
NOTE 2 An overview of profile and areal standards in the GPS matrix model is given in Annex J.
NOTE 3 The relation of this document to the GPS matrix model is given in Annex K.
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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 Arithmetic mean height
4.2.3 Root mean square height
4.2.4 Skewness
4.2.5 Kurtosis
4.2.6 Total height
4.2.7 Maximum height per section
4.3 Spatial parameters
4.3.1 General
4.3.2 Autocorrelation length
4.3.3 Dominant spatial wavelength
4.4 Hybrid parameters
4.4.1 General
4.4.2 Root mean square gradient
4.4.3 Arithmetic mean of absolute gradient
4.4.4 Maximum absolute gradient
4.4.5 Developed length
4.4.6 Developed length ratio
4.5 Material ratio functions and related parameters
4.5.1 Material ratio functions
4.5.2 Material ratio parameters
4.5.3 Parameters for stratified surfaces using the material ratio curve
4.5.4 Parameters for stratified surfaces using the material probability curve
4.5.5 Volume parameters
5 Feature parameters
5.1 Parameters based on peak heights and pit depths
5.1.1 General
5.1.2 Maximum peak height
5.1.3 Mean peak height
5.1.4 Maximum pit depth
5.1.5 Mean pit depth
5.1.6 Maximum height
5.2 Parameters based on profile elements
5.2.1 General
5.2.2 Mean profile element spacing
5.2.3 Maximum profile element spacing
5.2.4 Standard deviation of profile element spacings
5.2.5 Mean profile element height
5.2.6 Maximum profile element height
5.2.7 Standard deviation of profile element heights
5.2.8 Peak count parameter
5.3 Parameters based on feature characterization
5.3.1 General
5.3.2 Named feature parameters
Annex A (informative) Determination of the first and second derivative
Annex B (informative) Determination of the local curvature
Annex C (normative) Determination of the material ratio curve
Annex D (normative) Determination of profile parameters for stratified surfaces
Annex E (normative) Crossing-the-line segmentation to determine profile elements
Annex F (normative) Feature characterization
Annex G (informative) Summary of profile surface texture parameters and functions
Annex H (informative) Specification analysis workflow
Annex I (informative) Changes to previous ISO profile documents
Annex J (informative) Overview of profile and areal standards in the GPS matrix model
Annex K (informative) Relation to the GPS matrix model
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 Arithmetic mean height
4.2.3 Root mean square height
4.2.4 Skewness
4.2.5 Kurtosis
4.2.6 Total height
4.2.7 Maximum height per section
4.3 Spatial parameters
4.3.1 General
4.3.2 Autocorrelation length
4.3.3 Dominant spatial wavelength
4.4 Hybrid parameters
4.4.1 General
4.4.2 Root mean square gradient
4.4.3 Arithmetic mean of absolute gradient
4.4.4 Maximum absolute gradient
4.4.5 Developed length
4.4.6 Developed length ratio
4.5 Material ratio functions and related parameters
4.5.1 Material ratio functions
4.5.2 Material ratio parameters
4.5.3 Parameters for stratified surfaces using the material ratio curve
4.5.4 Parameters for stratified surfaces using the material probability curve
4.5.5 Volume parameters
5 Feature parameters
5.1 Parameters based on peak heights and pit depths
5.1.1 General
5.1.2 Maximum peak height
5.1.3 Mean peak height
5.1.4 Maximum pit depth
5.1.5 Mean pit depth
5.1.6 Maximum height
5.2 Parameters based on profile elements
5.2.1 General
5.2.2 Mean profile element spacing
5.2.3 Maximum profile element spacing
5.2.4 Standard deviation of profile element spacings
5.2.5 Mean profile element height
5.2.6 Maximum profile element height
5.2.7 Standard deviation of profile element heights
5.2.8 Peak count parameter
5.3 Parameters based on feature characterization
5.3.1 General
5.3.2 Named feature parameters
Annex A (informative) Determination of the first and second derivative
Annex B (informative) Determination of the local curvature
Annex C (normative) Determination of the material ratio curve
Annex D (normative) Determination of profile parameters for stratified surfaces
Annex E (normative) Crossing-the-line segmentation to determine profile elements
Annex F (normative) Feature characterization
Annex G (informative) Summary of profile surface texture parameters and functions
Annex H (informative) Specification analysis workflow
Annex I (informative) Changes to previous ISO profile documents
Annex J (informative) Overview of profile and areal standards in the GPS matrix model
Annex K (informative) Relation to the GPS matrix model
Bibliography