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IS0
I NT ERN AT I ON AL ORGANIZATION FOR STA N DARD I ZAT 1 ON
IS0 RECOMMENDATION
R 88
REVERSE BEND TESTING OF STEEL SHEET AND STRIP
LESS THAN 3 mm THICK
1st EDITION
February 1959
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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.
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BRIEF HISTORY
The IS0 Recommendation R 88, Reverse Bend Testing of Steel Sheet and
Strip Less than 3 mm Thick, was drawn up by Technical Committee ISO/TC 17,
Steel, the Secretariat of which is held by the British Standards Institution
(B. S. I .) .
The drawing up of an IS0 Recommendation concerning this test was decided
on at the second meeting of ISO/TC 17, held in New York, in June 1932. The
Technical Committee instructed its Working Group No. 1, IIZethods of Mecha-
nical Testing for Steel, to prepare a draft proposal which was circulated to the
members of the Technical Committee in March 1954.
The comments of the Member Bodies were considered by the Working Group
which submitted, in August 1954, a revised draft proposal to the members
of ISO/TC 17. The revised draft proposal was discussed at the fourth
meeting of the full Committee, held in Stockholm, in June 1955, along with the
comments received, and was adopted, with a number of small amendments, as a
Draft IS0 Recommendation.
On 31 January 1957, the Draft IS0 Recommendation (No. 153) was sub-
mitted to all the IS0 Member Bodies and, subject to a few modifications, was
approved by the following Member Bodies:
Austria Hungary
Portugal
Belgium *Ireland Romania
*Bulgaria Italy Spain
"Canada Japan Sweden
Denmark Mexico United Kingdom
Finland
Norway U.S.S.R.
Germany Pakistan
*Greece Poland
One Member Body opposed the approval of the Draft: France.
The Draft IS0 Recommendation was then submitted by correspondence
to the IS0 Council, which decided, in February 1959, to accept it as an
IS0 RECOMMENDATION.
* These Member Bodies stated that they had no objection to the Draft being approved.
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ISO/R88 - 1959 (E)
IS0 Recommendation R 88 February 1959
REVERSE BEND TESTING OF STEEL SHEET AND STRIP
LESS THAN 3 mm THICK
1. PRINCIPLE OF TEST
1.1 The test consists of repeated bending
through go”, in opposite directions, of a
rectangular test piece held at one end, each
bend being over a support having a spe-
cified radius.
1.2 One “reverse bend” consists of bend-
ing the test piece through an angle of 90
...