ISO 11531:2015

INTERNATIONAL ISO
STANDARD 11531
Second edition
2015-11-01
Metallic materials — Sheet and strip
— Earing test
Matériaux métalliques — Tôles et bandes — Essai de corne
Reference number
ISO 11531:2015(E)
©
ISO 2015

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ISO 11531:2015(E)

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ii © ISO 2015 – All rights reserved

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ISO 11531:2015(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Symbols and their meanings . 1
3 Principle . 2
4 Test equipment. 3
5 Test piece . 3
6 Procedure. 4
7 Interpretation of results . 5
8 Test report . 5
© ISO 2015 – All rights reserved iii

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ISO 11531:2015(E)

Foreword
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The committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 2, Ductility testing.
This second edition cancels and replaces the first edition (ISO 11531:1994), of which it constitutes a
minor revision.
iv © ISO 2015 – All rights reserved

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INTERNATIONAL STANDARD ISO 11531:2015(E)
Metallic materials — Sheet and strip — Earing test
1 Scope
This International Standard specifies a method for determining the ear height of metal sheet and strip
of nominal thickness from 0,1 mm to 3 mm after deep drawing.
2 Symbols and their meanings
The meanings of the symbols used in the earing test are given in Table 1 and illustrated in Figures 1 and 2.
Table 1 — Symbols
   Symbol   Meaning   Units
     a Thickness of test piece    mm
     d Diameter of punch    mm
1
     R Corner radius of punch    mm
1
     d Inside diameter of die   mm
2
    R Inside corner radius of die   mm
2
    d Diameter of circular blank   mm
b
     h Distance between outside bottom of cup and any ear    mm
t
peak
     h Distance between outside bottom of cup and any ear    mm
v
valley
     h Maximum value of h   mm
t,max t
     h Minimum value of h   mm
v,min v
Mean value of h   mm
t
     h
t
Mean value of h   mm
     h v
v
Mean ear height   mm
     h
e
     h Maximum ear height   mm
e,max
     N Number of ear peaks   —
ear peaks
     N Number of ear v
...