ISO 15166-1:1998 接着剤—バルク試験片の準備方法—パート1：2部構成のシステム | ページ 2

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.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 15166-1 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products.

ISO 15166 consists of the following parts, under the general title Adhesives — Methods of preparing bulk specimens:

• Part 1: Two-part systems
• Part 2: Elevated-temperature-curing one-part systems

Introduction

Accurate values for the mechanical properties of adhesives are needed in the design of bonded joints to enable calculations of the stress distribution in the loaded joint to be made and failure criteria for the adhesive material to be determined. The use of test methods that employ specimens in the form of a bonded joint for the measurement of these properties is not ideal. This is because the thickness dimension of the bond constitutes the gauge length of the specimen for the determination of strain and, since the thickness is small (typically < 1 mm), strains cannot be routinely determined with high accuracy. Furthermore, the failure of a joint specimen usually arises under a multiaxial-stress state, the complexity of which depends upon many factors such as the geometry of the joint, the dimensions and properties of the adherends and the geometry of any fillets. The failure data derived from these specimens may be informative for design purposes, but additional data are needed corresponding to deformation and failure under more simple stress states such as shear and uniaxial tension.

The availability of bulk specimens with suitable dimensions will enable mechanical properties under different loading conditions and environments to be measured using methods developed and standardized for engineering plastics. These are both accurate and relatively inexpensive.

Procedures are described that will enable specimens to be obtained that have structures and properties comparable with those for the adhesive in a bonded joint. Additional tests on joint specimens will be necessary to give information relating to the performance of the bond between the adhesive and the adherend.

1 Scope

This part of ISO 15166 describes methods for the preparation of bulk specimens of adhesives.

The procedures described are suitable for two-part adhesives such as epoxies, polyurethanes, acrylics, etc.

The methods are not suitable for the preparation of bulk specimens of adhesives which require the evaporation of solvents or the liberation of gas for curing. They are also not suitable for pseudo-one-part adhesives that require an initiator to be applied to one of the surfaces to be bonded. In addition, the methods are not suitable for adhesives whose working life is very short, so that there is insufficient time to mix the components, dispense the adhesive and close the mould.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 15166. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 15166 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.

3 Definition

For the purposes of this part of ISO 15166, the following definition, as given in ISO 472:1988, applies.