ISO 8060:2024

Composites and reinforcements fibres — Carbon fibre reinforced plastics (CFRPs) and metal assemblies — Characterization of durability of adhesive interfaces by wedge rupture test

This document specifies a method for determining the durability of the adhesive joints of carbon fibre reinforced plastics (CFRPs) and metal assemblies by a wedge rupture test using a double cantilever beam (DCB) specimen under specified environmental conditions. This method is intended for evaluating the safety and reliability of adhesives, primers, and surface treatments of the adherends.

Composites et fibres de renfort — Assemblages de plastiques renforcés de fibres de carbone (CFRP) et de métal — Caractérisation de la durabilité des interfaces adhésives à l'aide d'un essai de clivage au coin

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 83.120 - Reinforced plastics
• Technical Committee: ISO/TC 61/SC 13 - Composites and reinforcement fibres
• Drafting Committee: ISO/TC 61/SC 13 - Composites and reinforcement fibres
• Current Stage: 6060 - International Standard published
• Start Date: 01-Mar-2024
• Due Date: 06-Aug-2024
• Completion Date: 01-Mar-2024

Standards Content (Sample)

International
Standard
ISO 8060
First edition
Composites and reinforcements
2024-03
fibres — Carbon fibre reinforced
plastics (CFRPs) and metal
assemblies — Characterization of
durability of adhesive interfaces by
wedge rupture test
Composites et fibres de renfort — Assemblages de plastiques
renforcés de fibres de carbone (CFRP) et de métal —
Caractérisation de la durabilité des interfaces adhésives à l'aide
d'un essai de clivage au coin
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2  Normative references . 1
3  Terms, definitions and symbols . 1
3.1 Terms and definitions .1
3.2 Symbols .2
4 Principle . 2
5 Apparatus . 2
6 Specimens. 3
6.1 Number of specimens .3
6.2 Conditioning.3
6.3 Preparation of specimens .3
7 Testing procedure . 5
8 Test report . 6
Annex A (informative)  Determination of thickness ratio (h /h) for CFRTP/Al adhesive joint
1 2
specimen . 8
Bibliography .10

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites
and reinforcement fibres.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
This document specifies a method for evaluating the durability of adhesive interfaces in the bonded
assemblies of carbon fibre reinforced plastics (CFRPs) and metals by a wedge test with a double cantilever
beam (DCB) specimen under specified environmental conditions. The wedge rupture test force the crack
to propagate along the CFRP/adhesive or metal/adhesive interfaces, or within the adhesive layer. This test
method provides a quantitative value for evaluating the effect of a harsh environmental condition on the
durability of adhesive interfaces as an interfacial fracture energy. This method is intended for testing only
those bonded plates used in bonding carbon fibre reinforced plastics (CFRPs) to metal assemblies.
The potential benefits to the users of CFRP-metal assemblies of implementing the durability of adhesive
interfaces in the bonded plates of carbon fibre reinforced plastics (CFRPs) to metal assemblies based on this
document are:
a) expanding CFRP applications to the fields of the combinations with metallic components;
b) the detection or the prevention of physical properties loss - such as ion migration and time-related
degradation in sealant film, injected calking layer and glass fibre reinforced plastics (GFRPs) layer;
c) demonstrating the conformity to specified conditions for type certification requirements in the
engineering such as aircraft developments;
d) evaluating the procedures for maintenance, repair and overhaul (MRO) in the engineering operations
such of CFRP aircrafts.
It is not the intent of this document to imply the need for:
— omitting relevant field tests for CFRP related engineering;
— generally specifying the dimensions of test specimen to represent CFRPs related bonded or fastened
structures;
— superimposing test results for specific applications of the parameters that exceed the range of this
document.
v
International Standard ISO 8060:2024(en)
Composites and reinforcements fibres — Carbon fibre
reinforced plastics (CFRPs) and metal assemblies —
Characterization of durability of adhesive interfaces by wedge
rupture test
SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety problems, if
any, associated with its use. It is the responsibility of the user to establish appropriate safety and
health practices and determine any applicable regulatory conditions prior to use. It is recognized
that some of the materials permitted in this document might have a negative environmental impact.
As technological advances lead to more acceptable alternatives for such materials, they will be
eliminated to the greatest extent possible. At the end of the test, care should be taken to dispose of
all waste in an appropriate manner.
1 Scope
This document specifies a method for determining the durability of the adhesive joints of carbon fibre
reinforced plastics (CFRPs) and metal assemblies by a wedge rupture test using a double cantilever beam
(DCB) specimen under specified environmental conditions. This method is intended for evaluating the
safety and reliability of adhesives, primers, and surface treatments of the adherends.
2  Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
the requirements of this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 178, Plastics — Determination of flexural properties
ISO 10365, Adhesives — Designation of main failure patterns
ISO 9142, Adhesives — Guide to the selection of standard laboratory ageing conditions for testing bonded joints
3  Terms, definitions and symbols
3.1  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10365 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

3.2  Symbols
a crack length from the wedge/adherend contact point to the crack tip (mm) (see Figure 4)
a initial crack length after insertion of a wedge (mm)
E flexural modulus of the CFRP adherend (GPa); if the substrate is a fibre composite
E flexural modulus of the metal adherend (GPa)
h thickness of the carbon fibre reinforces plastic (CFRP) beam (mm) in a DCB specimen
h thickness of the metal beam (mm) in a DCB specimen
G critical strain energy release rate, or adhesive fracture energy, for the applied opening load produced
C
by the insertion of a wedge into the precrack (J/m )
Δ wedge thickness (mm)
4 Principle
The durability of the dissimilar adhesive joint interfaces between CFRP and metal is evaluated under harsh
environments, such as high humidity, high temperature, high-and-low thermal cycles, salt mist environment,
and so on, by the wedge test (see ISO 10354) using a DCB specimen. A wedge is driven into precrack
preliminary made in the DCB specimen with an appropriate geometry, and the crack is propagated along the
interfaces subjected to tensile opening load. The initial crack made by inserting the wedge is stabilized, but
it will be propagated when the specimen is subject to a specified environmental condition. This experiment
allows to evaluate the durability of the crack at the interface under a stressed condition quantitatively.
5 Apparatus
5.1  Wedge, with 25 mm width and 30 mm length and with a thickness of Δ, ranging from 1 mm to 3 mm,
as shown in Figure 1. The composition of the wedge will not interact chemically with the adherents of the
tested specimens. Materials used for the wedge shall be stiff enough not to be deformed during the test.
Stainless steel is recommended. The radius of the wedge tip shall be lower than 30° to initiate the insertion
into the precrack and the surface of the wedge shall be smooth to make a smooth insertion into the precrack.
Dimensions in millimetres, except indicated otherwise
Figure 1 — Dimension of wedge
5.2  Tensile-testing machine, capable of producing a constant cross-head displacement rate between 5
and 15 mm/min in di
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