OS-C501

Offshore Standard DNV-OS-C501, November 2013
Sec.4 Materials - laminates – Page 45
Table 4-3 Values of k m
Target reliability level, Sec.2 [3.5]
Number of
test results
A B C D
Safety class low and Safety class normal
brittle failure and brittle failure
Safety class high and
brittle failure
or
or
Safety class low and
ductile failure
Safety class normal
and ductile failure
Safety class high and
ductile failure
3 3.0 3.7 5.0 7.4
4 2.7 3.2 4.0 5.3
5 2.5 2.9 3.5 4.4
6 2.4 2.8 3.3 4.0
7 2.4 2.8 3.1 3.7
8 2.3 2.6 3.0 3.5
10 2.3 2.5 2.8 3.2
15 2.2 2.3 2.6 2.9
Infinite 1.96 1.96 1.96 1.96
[2.6] and Table 4-4 shall be used instead of Table 4-3 when the conditions specified in [2.6] apply. [2.7] and
Table 4-5 may be used as an alternative to Table 4-3 when the conditions specified in [2.7] apply.
The background for the specification of the k m - values in Table 4-3, Table 4-4 and Table 4-5 is given in App.J.
2.6 k m for structures or components subjected loads with known maximum load effect.
2.6.1 For structures or components subjected to loads with known maximum load effect k m shall be taken as
specified in Table 4-4. Table 4-3 shall not be used. [2.7] and Table 4-5 may be used as an alternative to Table
4-4 when the conditions specified in [2.7] apply.
Table 4-4 Values of k m for loads with known maximum load effect
Number of
test results
Target reliability level, Sec.2 [3.5]
A B C D
Safety class low and Safety class normal
Safety class high and
brittle failure and brittle failure
brittle failure
or
or
Safety class low and Safety class normal Safety class high and
ductile failure and ductile failure ductile failure
3 4.2 5.8 10.4 16.1
4 3.5 4.4 6.6 9.0
5 3.1 3.8 5.1 6.5
6 2.9 3.5 4.5 5.5
7 2.8 3.3 4.1 4.8
8 2.7 3.1 3.8 4.4
10 2.6 2.9 3.5 4.0
15 2.4 2.7 3.1 3.4
Infinite 1.96 1.96 1.96 1.96
2.7 k m for well-known material combinations
2.7.1 For well-known FRP material combinations an upper limit of the standard deviation of the strength can
be specified that has a negligible probability of being exceeded. For such materials an alternative procedure for
determining the characteristic strength may be followed, in place of [2.5]. This procedure may result in a larger
characteristic strength compared to what is prescribed in [2.5].
For the purpose of determining characteristic strength by the alternative method a well-known material shall
as a minimum fulfil the following conditions:
— Fibres shall be E-glass or PAN based carbon fibres. The commercial brand of fibres shall have been
available in the market for at least five years. More recent introductions to the market shall not be
considered well known.
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