SIST ISO 1922:2020

Rigid cellular plastics - Determination of shear properties

This document specifies a procedure of determining the shear strength of rigid cellular plastics. It also provides for the determination of shear modulus and shear strain.

Titre manque

Penjeni polimerni materiali - Ugotavljanje nateznih lastnosti

General Information

• Status: Published
• Publication Date: 10-Jun-2020
• ICS: 83.100 - Cellular materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jun-2020
• Due Date: 15-Aug-2020
• Completion Date: 11-Jun-2020
• Ref Project: ISO 1922:2018 - Rigid cellular plastics - Determination of shear properties

Relations

• Revised: SIST ISO 1922:2015 - Rigid cellular plastics - Determination of shear strength
• Effective Date: 12-Oct-2013

Overview

ISO 1922:2018 - Rigid cellular plastics - Determination of shear properties specifies a laboratory procedure to determine the shear strength, and optionally the shear modulus and shear strain, of rigid cellular plastics (rigid foams). The standard describes specimen geometry, apparatus and machine requirements, conditioning, test procedures (two alternative methods), calculation formulas and reporting requirements. It is intended for consistent, repeatable measurement of shear behavior in rigid cellular plastics.

Key topics and technical requirements

• Scope: Procedure for shear strength; provisions for shear modulus and shear strain.
• Test arrangements: Two assemblies - single shear (one test specimen) and double shear (two shear planes).
  • Single specimen dimensions: length 250 mm, width 50 mm, thickness (25 ± 0.5) mm.
  • Double specimen: length 250 mm, width 50 mm, thickness as produced.
• Apparatus:
  • Test machine capable of steady movement at (1 ± 0.5) mm/min parallel to specimen axis.
  • Machine force measurement conforming to class 1 of ISO 7500-1.
  • Rigid specimen supports (flat metal plates) and universal joint adaptors to ensure alignment.
• Measurement procedures:
  • Procedure A: records displacement of the movable plate (recommended for shear strength only).
  • Procedure B: uses an extensometer (±1% precision) to measure relative displacement - recommended when calculating shear modulus and strain.
• Adhesive requirements: Adhesive bond between supports and specimen must have shear strength and modulus significantly greater than the test material (see Annex A for recommended adhesives/methods).
• Conditioning and environment: Typical test climates include (23 ± 2) °C / (50 ± 10)% RH or alternative specified ranges; tests must be conducted at conditioning conditions.
• Sampling & repeatability: Test sets of five specimens; reject failures at adhesive interface and repeat so that five valid results remain. The standard notes the precision and bias are unknown; results should not be used for dispute resolution.
• Calculations: Shear strength τ = F / A (with A = l × b for single, 2 × l × b for double). Shear modulus and strain formulas provided in the standard.

Applications

• Characterizing shear performance of rigid cellular plastics used in insulation, sandwich panels, structural core materials, and building products.
• Material development, quality control, specification compliance, and comparative testing of foam formulations and manufacturing batches.
• Input data for structural design, finite-element models, and failure analysis where core shear is critical.

Who uses this standard

• Materials and mechanical engineers, test laboratories, R&D teams, manufacturers of rigid cellular plastics and composite panels, certification bodies, and procurement/specification engineers.

Related standards

• ISO 1923 - Determination of linear dimensions for cellular plastics and rubbers (used for specimen measurements).
• ISO 7500-1 - Calibration and verification of static uniaxial testing machines (force-measuring system requirements).

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2020
Penjeni polimerni materiali - Ugotavljanje nateznih lastnosti
Rigid cellular plastics - Determination of shear properties
Ta slovenski standard je istoveten z: ISO 1922:2018
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 1922
Fifth edition
2018-09
Rigid cellular plastics —
Determination of shear properties
Reference number
©
ISO 2018
© ISO 2018
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Dimensions of test specimens . 5
6.1 General . 5
6.2 Single shear test specimen. 5
6.3 Double shear test specimen . 5
7 Number of test specimens . 5
8 Conditioning and test temperature and humidity. 6
9 Procedure. 6
10 Calculation and expression of results . 7
10.1 Shear strength . 7
10.2 Shear modulus . 7
10.3 Shear strain at fracture . 7
11 Precision and bias . 8
12 Test report . 8
Annex A (normative) Choice of adhesives for preparation of test specimens .9
Bibliography .10
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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular
plastics.
This fifth edition cancels and replaces the fourth edition (ISO 1922:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— title has been modified as: Rigid cellular plastics — Determination of shear properties;
— Clauses 2, 4, 5, 7, 8, 9 have been technically revised.
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 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 1922:2018(E)
Rigid cellular plastics — Determination of shear properties
1 Scope
This document specifies a procedure of determining the shear strength of rigid cellular plastics. It also
provides for the determination of shear modulus and shear strain.
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 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Principle
A shear stress is applied to a test specimen of defined shape by means of rigid specimen supports
bonded to the specimen.
There are two procedures:
— Procedure A, which is recommended for shear strength measurement only;
— Procedure B, which uses an extensometer or similar device to measure displacement and is, thus,
the recommended method to calculate the shear modulus and strain (and strength as well).
5 Apparatus
5.1 Test machine
5.1.1 General
A test machine capable of applying a sufficient force within the maximum displacement experienced in
the shear test.
It shall be capable of operating at a constant rate of movement of the movable head of (1 ± 0,5) mm/min
in a direction parallel to the longitudinal axis of the test specimen assembly.
The test machine, conforming to class 1 of ISO 7500-1 shall exert a force on the test specimen, and produce
a displacement of the movable support relative to the fixed supports, having a maximum error of 1 %.
If the shear modulus and strain is required, the force and the displacement shall be simultaneously
recorded.
5.1.2 Single test specimen arrangement
The test machine shall exert longitudinal shear forces through parallel plates bonded to a single test
specimen of dimensions as in 6.2. The parallel plates shall be rigid
...

INTERNATIONAL ISO
STANDARD 1922
Fifth edition
2018-09
Rigid cellular plastics —
Determination of shear properties
Reference number
©
ISO 2018
© ISO 2018
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Dimensions of test specimens . 5
6.1 General . 5
6.2 Single shear test specimen. 5
6.3 Double shear test specimen . 5
7 Number of test specimens . 5
8 Conditioning and test temperature and humidity. 6
9 Procedure. 6
10 Calculation and expression of results . 7
10.1 Shear strength . 7
10.2 Shear modulus . 7
10.3 Shear strain at fracture . 7
11 Precision and bias . 8
12 Test report . 8
Annex A (normative) Choice of adhesives for preparation of test specimens .9
Bibliography .10
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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular
plastics.
This fifth edition cancels and replaces the fourth edition (ISO 1922:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— title has been modified as: Rigid cellular plastics — Determination of shear properties;
— Clauses 2, 4, 5, 7, 8, 9 have been technically revised.
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 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 1922:2018(E)
Rigid cellular plastics — Determination of shear properties
1 Scope
This document specifies a procedure of determining the shear strength of rigid cellular plastics. It also
provides for the determination of shear modulus and shear strain.
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 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Principle
A shear stress is applied to a test specimen of defined shape by means of rigid specimen supports
bonded to the specimen.
There are two procedures:
— Procedure A, which is recommended for shear strength measurement only;
— Procedure B, which uses an extensometer or similar device to measure displacement and is, thus,
the recommended method to calculate the shear modulus and strain (and strength as well).
5 Apparatus
5.1 Test machine
5.1.1 General
A test machine capable of applying a sufficient force within the maximum displacement experienced in
the shear test.
It shall be capable of operating at a constant rate of movement of the movable head of (1 ± 0,5) mm/min
in a direction parallel to the longitudinal axis of the test specimen assembly.
The test machine, conforming to class 1 of ISO 7500-1 shall exert a force on the test specimen, and produce
a displacement of the movable support relative to the fixed supports, having a maximum error of 1 %.
If the shear modulus and strain is required, the force and the displacement shall be simultaneously
recorded.
5.1.2 Single test specimen arrangement
The test machine shall exert longitudinal shear forces through parallel plates bonded to a single test
specimen of dimensions as in 6.2. The parallel plates shall be rigid with one plate attached to the fixed
parts and the other to the movable parts of the test machine.
5.1.3 Double test specimen arrangement
The test machine shall exert longitudinal shear forces through parallel plates bonded to a double test
specimen of dimensions as in 6.3. The parallel plates shall be rigid with the outer
...