BS EN 4861:2020

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Aerospace series. Metrological assessment procedure for kinematic fields measured by digital image correlation

Published By	Publication Date	Number of Pages
BSI	2020	40

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Categories: 49.025.01 - Materials for aerospace construction in general, BSI

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Description

This document specifies the monitoring of mechanical tests and inspections performed both at the material (coupon) and at the structural scale by the implementation of kinematic field measurements by digital image correlation. This document describes an in situ method for evaluating the metrological performance of an extensometer system using image correlation for the delivery of displacement fields, and by extrapolation, of deformation fields. It can be implemented prior to the actual start of the test (or inspection). It will inform of the metrological performance in testing conditions.

This document allows the metrological performance of the measuring technology to be quantified. The methodology described herein is not to be considered as a calibration step. This reference document does not exhaustively specify the constitutive elements of a generic system of Digital Image Correlation measurement. This reference does not address the measurement of 3D shapes via stereocorrelation systems.

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PDF Pages	PDF Title
2	undefined
6	1 Scope 2 Normative references 3 Terms and definitions
7	4 Symbols and abbreviations 5 Principle
8	6 System for the assessment of the metrological performance 6.1 Principle 6.2 Traceability of metrological performance assessment 7 Pre-assessment inspection 7.1 Aim 7.2 Records of the inspection 7.3 Identification of extensometer system elements
9	8 Measurement of physical pixel size 8.1 Case of monovision measurements – software procedure 8.2 Case od monovision measurements – manual procedure 8.3 Case of monovision measurements – identification during the performance assessment procedure 8.4 Case of stereovision measurements 9 Metrological assessment process 9.1 Environmental considerations 9.1.1 General 9.1.2 Lightning conditions
10	9.1.3 Case of artificial random speckle pattern 9.2 Calibration increments
12	9.3 Process for metrological performance assessment 9.4 Determination of the extensometer system characteristics 9.4.1 General 9.4.2 Resolution
13	9.4.3 Bias error 9.4.3.1 Relative bias error and relative bias error field 9.4.3.2 Absolute bias error and absolute bias error field 10 Classification of the extensometer system 10.1 Input data 10.2 Analysis of the data
14	10.3 Classification criteria 10.4 Assessment of the results
15	11 Uncertainty determination 11.1 Uncertainty of the metrological performance assessment 11.2 Uncertainty budget determination 12 Metrological performance assessment intervals for extensometer systems 13 Metrological performance assessment certificates 13.1 Mandatory information
16	13.2 Data presentation
17	Annex A (informative)Uncertainty of measurement A.1 Introduction
18	A.2 Calibration apparatus
19	A.3 Resolution A.4 Repeatability A.5 Relative mean error of the extensometer system A.6 Expanded uncertainty
20	A.7 Typical values of uncertainty A.8 Example of uncertainty budget for extensometric system
23	Annex B (informative)Classification of the system for the assessment of the metrological performance
24	Annex C (normative)Covariance and covariance matrix
30	Annex D (informative)Template for metrological assessment report for kinematic fields measured by digital image correlation D.1 Extensometer system identification D.2 Principle D.3 Date of metrological assessment D.4 Controller D.5 System configuration
31	D.6 System for the assessment of the metrological performance D.7 Assessment plan
33	D.8 Results — resolution evaluation
34	D.9 Results — class field D.10 Synthesis
37	Annex E (informative)Alternative approach for optical model identification in the caseof monovision measurements E.1 Measurements
38	E.2 Picture

Additional information

Status	Definitive
Pages	40
Publication Date	2020-12-15
ISBN	978 0 539 05041 7
Standard Number	BS EN 4861:2020
Title	Aerospace series. Metrological assessment procedure for kinematic fields measured by digital image correlation
Identical National Standard Of	EN 4861
Descriptors	Surfaces, Surface treatment, Treatment, Launching facilities (aerospace), Dimensions, Cable ties, Electrical measurement, Temperature, Circuit-breakers, Alloys, Nickel alloys, Non-ferrous alloys, Shape, Diameter, Sleeving (electrical), Durability, Environmental testing, Testing, Testing methods, Electrodes, Melting, Air, Steels, Contrast (optical), Measurement, Aircraft components, Cables (electric), Test methods, Aerospace transport, Corrosion tests, Compression set, Mixing, Tear tests, Elastic constants, Elongation, Tensile strength, Density, Hardness testing, Approval testing, Qualification approval, Quality assurance, Quality assurance systems, Synthetic rubber, Natural rubber, Air transport engineering, Extensometers, Linear measuring instruments, Metals, Calibration
Publisher	BSI
Committee	ACE/61/-/6
ICS Codes	49.025.01 - Materials for aerospace construction in general

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