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BSI PD IEC TS 62788-6-3:2022 2023

BSI PD IEC TS 62788-6-3:2022 2023

$167.15

Measurement procedures for materials used in photovoltaic modules – Adhesion testing for PV module laminates using the single cantilevered beam (SCB) method

Published By Publication Date Number of Pages
BSI 2023 36
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Apparatus
4.1 Load frame
Figures
Figure 1 – Diagram of the loading connection using a clevis grip
12 4.2 Loading tab
5 Width-tapered cantilever beam
5.1 General
Figure 2 – Schematic of load frame with a) a platen for securing test coupon, and b) modified to sit on top of a PV module
Figure 3 – Photos of the loading tab alone, and attached to the beam
13 5.2 Beam design
5.3 Beam selection
Figure 4 – Width-tapered beam
14 6 Test method
6.1 Specimen preparation
6.2 Measurement procedure
Tables
Table 1 – Typical adhesion strengths
15 Figure 5 – Typical width-tapered cantilever beam load/displacement curve
16 6.3 Analysis
6.3.1 Critical adhesion energy, Gc
Figure 6 – Example of an af measurement on glass/encapsulant/cell specimens
17 7 Report
18 Annex A (informative)Summary of background theory, and how this method can be generalized
A.1 Background theory
19 A.2 Beam materials
20 Annex B (informative)Guidance for specific use cases
B.1 General
B.2 Adhesion test coupons
B.2.1 Backsheet / encapsulant adhesion
B.2.2 Backsheet interlayer adhesion
21 B.2.3 Glass/encapsulant adhesion
B.2.4 Adhesion between different encapsulants
22 B.2.5 Cell/encapsulant (coupons)
B.3 Modules
B.3.1 General
B.3.2 Targeting a specific interface in a module
23 Figure B.1 – Top view of backsheet and encapsulant beam coupons
24 Figure B.2 – Cross-sectional view of backsheet and encapsulant beam coupons
25 Annex C (informative)Reference engineering diagrams for loading tab and beam
26 Figure C.1 – Schematics of loading tab
27 Figure C.2 – Schematics of beam
28 Annex D (normative)Using a reference compliance curve to calculate Gc
D.1 General
D.2 Procedure
D.2.1 Beam compliance measurement
Figure D.1 – Photo of a beam prior to start of the calibration measurement
29 D.2.2 Definition of empirical parameters
D.2.3 Validation of reference parameters
Figure D.2 – Photo of a beam at the end of the calibration measurement
Table D.1 – Reference empirical fit parameters
30 D.2.4 Generating a custom set of α, β and γ parameters
Table D.2 – Example read points for fit evaluation
31 D.2.5 Calculation of crack length ai for adhesion specimens
Figure D.3 – Plot used for generating beam calibration curves with the empirical fits according to Formula (D.2) using values from Table D.1
32 Annex E (informative)Methods for measurement of final debond length af
E.1 General
E.2 Aluminum foil method
E.3 Light method
E.4 Pull-apart method
33 Figure E.1 – Illustration of debond length measurement with a cohesive zone
34 Bibliography

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