Co-operating organizations

The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations:

The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this standard:

This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 30th May, 1961

The following BSI references relate to the work on this standard:

Committee reference ISM/NFM/4 Draft for comment A(MEE) 9391

Foreword

In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they refer.

A complete list of British Standards, numbering over 9,000, fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The Catalogue may be consulted in many public libraries and similar institutions.

This standard makes reference to the following British Standard:

BS 131‑2, Charpy V-notch impact test on metals.

This British Standard which states the requirements for the Izod Impact Test on metals is published as Part 1 of a revision of BS 131. Part 2 previously published gives the requirements for the Charpy V-notch test.

The work of Technical Committee 17, “Steel”, of the International Organization for Standardization (ISO) has been taken into account in preparing the standard and the square section and circular section straight notch test pieces are in accordance with ISO Recommendation R84. The scope has also been widened to include details of the method of test together with structural and dimensional requirements for testing machines.

Dimensions with appropriate machining tolerances are given for standard 10 mm square section and standard circular section test pieces. The use of the curved notch circular section test piece is not preferred, but at the request of the steel industry the form and dimensions of this test piece are given in an Appendix.

After due consideration of the requirements of certain sections of industry for subsidiary test pieces of cross-section smaller than 10 mm x 10 mm, it has been decided to omit the two given in the 1933 revision of the standard, and to introduce in an appendix two new subsidiary test pieces having dimensions of 10 mm × 7.5 mm and 10 mm × 5 mm with the notch cut in a narrow face. These are intended for use only when it is impossible to obtain a standard test piece from the material available. It should be noted that no trustworthy relationship has been found between the energies absorbed in breaking test pieces of different sizes and only results of test pieces of identical dimensions should be compared.

In this standard no reference is made to the number of tests required for particular applications as this is regarded as part of the specification for the material.

It should also be noted that no reliable relationship has been found between different types of impact test, and conversions from Izod impact test results to Charpy-V-notch or Charpy U-notch values are not recommended.

A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16 and a back cover.

This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.

1 Scope

This British Standard specifies the conditions for carrying out the Izod impact test on metals. The test consists of measuring the energy absorbed in breaking a notched test piece by one blow from a striker carried by a pendulum. The test piece is gripped vertically with the root of the notch in the same plane as the upper face of the grips. The blow is struck on the same face as the notch and at a fixed height above it.

2 Form and dimensions of test piece

3 Preparation of test piece

4 Testing machine

5 Striking energy

6 Test requirements

7 Testing temperature

8 Presentation of results

BS 131-1:1961

Methods for notched bar tests - The Izod impact test on metals

Current

Published:

30 May 1961