ISO 22841:2021

Composites and reinforcements fibres - Carbon fibre reinforced plastics(CFRPs) and metal assemblies - Determination of the tensile lap-shear strength

This document specifies a method for determining the lap-shear strength of the adhesive joint between carbon fibre-reinforced plastics (CFRPs) and metal adherends, using a standard specimen loaded in tension and under specified conditions of preparation, conditioning and testing. This method is intended for assessing the suitability of adhesives to be used for bonding a carbon fibre reinforced plastic (CFRPs) to a metal.

Composites et fibres de renfort — Assemblages de plastiques renforcés de fibres de carbone (CFRP) et de métal — Détermination de la résistance au cisaillement en traction

General Information

• Status: Published
• Publication Date: 19-Jan-2021
• ICS: 83.120 - Reinforced plastics
• Technical Committee: ISO/TC 61/SC 13 - Composites and reinforcement fibres
• Drafting Committee: ISO/TC 61/SC 13/WG 7 - Composites and metal assemblies
• Current Stage: 6060 - International Standard published
• Start Date: 20-Jan-2021
• Due Date: 09-Sep-2020
• Completion Date: 20-Jan-2021

Relations

• Amended By: ISO 22841:2021/Amd 1:2022 - Composites and reinforcements fibres - Carbon fibre reinforced plastics(CFRPs) and metal assemblies - Determination of the tensile lap-shear strength - Amendment 1: Precision data
• Effective Date: 06-Jun-2022

Overview - ISO 22841:2021 (CFRP to metal lap‑shear testing)

ISO 22841:2021 specifies a standardized method to determine the tensile lap‑shear strength of adhesive joints between carbon fibre‑reinforced plastics (CFRPs) and metal adherends. The standard uses a single‑lap specimen loaded in tension under defined preparation, conditioning and testing conditions to assess the suitability of adhesives for bonding CFRP to metal in development, qualification and quality control.

Key topics and technical requirements

• Test principle: Single‑overlap joint is loaded in tension to induce shear in the adhesive layer; failure load is recorded.
• Specimen construction: One CFRP and one metal adherend. Typical nominal thicknesses shown: CFRP t = 3.0 mm ± 0.3 mm; metal t = 3.0 mm ± 0.25 mm. Six specimens are required from prepared panels.
• Preparation & curing: Surfaces may be abraded as agreed; adhesives prepared and cured per manufacturer or client/test lab agreement. Cure time/conditions must be recorded.
• Conditioning: Specimens conditioned in standard atmospheres per ISO 291 or as agreed between parties.
• Apparatus: Accurate linear measuring device (±0.05 mm), tensile testing machine sized so rupture occurs between 10 % and 80 % of load cell capacity, and grips that self‑align. Machine response and force measurement accuracy requirements are specified.
• Test procedure: Specimens loaded so failure occurs within (60 ± 20) s (unless otherwise agreed). Orientation and sequencing of specimens are controlled to reduce bias.
• Results & calculation: Report breaking force (N) and lap shear strength (MPa) = breaking force / shear area (mm²). Express arithmetic mean and standard deviation for valid specimens.
• Test report: Must include full identification of adhesive and adherends, bond/process details, adhesive thickness control, specimen dimensions, conditioning, test speed, individual results, mean, SD, and any deviations.

Applications - who uses ISO 22841:2021

• Adhesive manufacturers for product development and qualification of adhesives for CFRP-to-metal bonding.
• Composite and mechanical engineers evaluating joint performance in aerospace, automotive, marine and sporting goods.
• Materials testing laboratories performing standardized bond strength comparisons and quality control.
• Design and production teams validating bonding processes, surface preparation and cure cycles.

ISO 22841:2021 helps ensure consistent, comparable lap‑shear data to make informed material and process choices for bonded CFRP‑metal assemblies.

Related standards

• ISO 291 (conditioning atmospheres)
• ISO 472 (vocabulary)
• Referenced/related test methods: ISO 4587, ISO 19095 (adhesion in plastic‑metal assemblies)

Keywords: ISO 22841:2021, CFRP, carbon fibre reinforced plastics, lap‑shear strength, adhesive testing, bonded assemblies, tensile testing, metal adherends.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22841
First edition
2021-01
Composites and reinforcements
fibres — Carbon fibre reinforced
plastics(CFRPs) and metal assemblies
— Determination of the tensile lap-
shear strength
Composites et fibres de renfort — Assemblages de plastiques renforcés
de fibres de carbone (CFRP) et de métal — Détermination de la
résistance au cisaillement en traction
Reference number
©
ISO 2021
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2  Normative references . 1
3  Term and definitions . 1
4 Principle . 1
5 Apparatus . 2
6  Test specimen specification . 2
7 Preparation of test panels . 5
8  Conditioning of test panels . 5
9 Preparation of test specimens . 5
10 Procedure. 5
11 Precision data . 5
12 Calculation and expression of results . 5
13 Test report . 6
Bibliography . 7
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
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 © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 22841:2021(E)
Composites and reinforcements fibres — Carbon fibre
reinforced plastics(CFRPs) and metal assemblies —
Determination of the tensile lap-shear strength
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 practice. It is recognized that some of the materials permitted in this document 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 in accordance.
1 Scope
This document specifies a method for determining the lap-shear strength of the adhesive joint between
carbon fibre-reinforced plastics (CFRPs) and metal adherends, using a standard specimen loaded
in tension and under specified conditions of preparation, conditioning and testing. This method is
intended for assessing the suitability of adhesives to be used for bonding a carbon fibre reinforced
plastic (CFRPs) to a metal.
2  Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes 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 291, Plastics — Standard atmospheres for conditioning and testing
...