|
Ref. No.: ISO/ R 144 - 1960 (E)
IS0
I N T E RN AT1 O N A L ORGAN I2 AT I ON FOR STA N DARD 1 Z AT! O N
IS0 RECOMMENDATION
R 144
REVERSE BEND TESTING OF STEEL WIRE
1st EDIT I ON
February 1960
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 144, Reverse Bend Testing of Steel Wire, was drawn up
by Technical Committee ISO/TC 17, Steel, the Secretariat of which is held by the British
Standards Institution (B.S.I.).
During its third meeting, held in London, in December 1953, the Technical Committee
decided to undertake the study of an IS0 Recommendation concerning this test and assigned
the task of preparing a draft proposal on this subject to its Working Group ISO/TC
17/WG 1, Methods of Mechanical Testing for Steel.
A first draft proposal drawn up by Working Group No. 1 was submitted to the Tech-
nical Committee during the plenary meeting held in London, in March 1957. As a result of
decisions reached at that meeting, a second draft proposal was prepared by the Secretariat
and was submitted to the members of the Technical Committee for approval. With some
minor amendments, this draft proposal was accepted and a revised version, incorporating
these amendments, was adopted as a Draft IS0 Recommendation.
On 11 July 1958, this Draft IS0 Recommendation (No. 205) was distributed to all the
IS0 Member Bodies and was approved, subject to some amendments, by the following
Member Bodies :
Australia Germany Poland
Romania
Austria Hungary
Spain
Bulgaria India
Burma Israel Sweden
Chile Italy Switzerland
United Kingdom
Czechoslovakia Japan
U.S.S.R.
Denmark Netherlands
Finland New Zealand Yugoslavia
France Norway
One Member Body opposed the approval of the Draft : Belgium.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in February 1960, to accept it as an IS0 RECOMMENDATION.
-3-
---------------------- Page: 2 ----------------------
lSO/ R I44 - 1980 (E)
REVERSE BEND TESTING OF STEEL WIRE
1. SCOPE
This IS0 Recommendation applies only to wire having a diameter equal to or greater than
0.5 mm (0.02 in).
2. PRINCIPLE OF TEST
2.1 The test consists of repeated bending through go", in opposite directions, of a test piece
held at one end, each bend being over a cylindrical surface having a specified radius.
2.2 One reverse bend consists of bending the test piece through an angle of 90" and then
returning it to its original position (see Fig. 1).
2 bends I
I
FIG. 1. -- Method of counting reverse bends
3. SYMBOLS AND DESIGNATIONS
Number Symbol
Designation
1 d Diameter of a round wire (see Fig.' 2, page 5)
2 a Minimum thickness of a wire of non-circular section which
it is possible to arrange between parallel clamps (see
Fig. 3, page
...