ISO/TS 22762-4:2014
(Main)Elastomeric seismic-protection isolators — Part 4: Guidance on the application of ISO 22762-3
Elastomeric seismic-protection isolators — Part 4: Guidance on the application of ISO 22762-3
ISO/TS 22762‑4:2014 provides guidance on the use of ISO 22762‑3:2010. It includes example design calculations and provides data on the characteristics obtained from all types of elastomeric isolators.
Appareils d'appuis structuraux en élastomère pour protection sismique — Partie 4: Lignes directrices pour l'application de l'ISO 22762-3
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Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 22762-4
First edition
2014-07-15
Elastomeric seismic-protection
isolators —
Part 4:
Guidance on the application of
ISO 22762-3
Appareils d’appuis structuraux en élastomère pour protection
sismique —
Partie 4: Lignes directrices pour l’application de l’ISO 22762-3
Reference number
ISO/TS 22762-4:2014(E)
©
ISO 2014
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ISO/TS 22762-4:2014(E)
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ii © ISO 2014 – All rights reserved
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ISO/TS 22762-4:2014(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Guidance on the use of Clause 4 of ISO 22762-3 . 1
5 Guidance on the use of Clause 5 of ISO 22762-3 . 1
6 Guidance on the use of Clause 6 of ISO 22762-3 . 1
6.1 General . 1
6.2 Type tests and routine tests. 1
6.3 Functional requirements . 3
6.4 Design compressive force and design shear displacement . 3
6.5 Performance requirements . 4
7 Guidance on the use of Clause 7 of ISO 22762-3 .24
7.1 General .24
7.2 Compressive stiffness .24
8 Guidance on the use of Clause 8 of ISO 22762-3 .31
9 Guidance on the use of Clause 9 of ISO 22762-3 .31
10 Guidance on the use of Clause 10 of ISO 22762-3 .31
11 Guidance on the use of Clause 11 of ISO 22762-3 .31
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ISO/TS 22762-4:2014(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
ISO 22762 consists of the following parts, under the general title Elastomeric seismic-protection isolators:
— Part 1: Test methods
— Part 2: Applications for bridges — Specifications
— Part 3: Applications for buildings — Specifications
— Part 4: Guidance on the application of ISO 22762-3 [Technical Specification]
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TECHNICAL SPECIFICATION ISO/TS 22762-4:2014(E)
Elastomeric seismic-protection isolators —
Part 4:
Guidance on the application of ISO 22762-3
1 Scope
This Technical Specification provides guidance on the use of ISO 22762-3:2010. It includes example
design calculations and provides data on the characteristics obtained from all types of elastomeric
isolators.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 22762-1:2010, Elastomeric seismic-protection isolators — Part 1: Test methods
ISO 22762-3:2010, Elastomeric seismic-protection isolators — Part 3: Applications for
buildings — Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22762-3:2010 apply.
4 Guidance on the use of Clause 4 of ISO 22762-3
No guidance is given.
5 Guidance on the use of Clause 5 of ISO 22762-3
No guidance is given.
6 Guidance on the use of Clause 6 of ISO 22762-3
6.1 General
Guidance is given for 6.2, 6.4, and 6.5.
6.2 Type tests and routine tests
An example of the scaled test pieces (scales A and B) for the type testing of the specific isolator size is
given as follows.
Dimensions and properties of target isolator (isolator-X) are shown in Table 1.
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ISO/TS 22762-4:2014(E)
Table 1 — Dimensions and properties of isolator-X
Outer diameter, d (mm) 1 000
o
Inner diameter, d (mm) 25
i
Thickness of one rubber layer, t (mm) 6,7
r
Thickness of reinforcing steel plate, t (mm) 4,4
s
Number of rubber layer, n 30
First shape factor, S 36,4
1
Second shape factor, S 5,0
2
3
Shear stiffness, K (N/mm × 10 ) 2,44
h
Equivalent damping ratio, h 0,225
eq
3
Compressive stiffness, K (N/mm × 10 ) 5 450
v
In this case, requirement for scales A and B test piece are shown in Table 4 of ISO 22762-3:2010.
An example of dimensions and properties of scales A and B is shown in Table 2.
Table 2 — Examples of Scales A and B for Isolator-X
Characteristics Scale A Scale B
Scale 0,25 0,6
Outer diameter, d (mm) 250 600
o
Inner diameter, d (mm) 0 (6,3) 15
i
Thickness of one rubber layer, t ( mm) 1,7 4,0
r
Thickness of reinforcing steel plate, t (mm) 1,2 2,2
s
Number of rubber layer, n 30 30
First shape factor, S 36,4 36,4
1
Second shape factor, S 5,0 5,0
2
3
Shear stiffness, K (N/mm × 10 ) 0,61 1,46
h
Equivalent damping ratio, h 0,225 0,225
eq
3
Compressive stiffness, K (N/mm × 10 ) 1 360 3 270
v
For any dimension, variation of ±5 % from exact scale-downed dimensions can be allowed.
The scaling of reinforcing plate for scale A can be adjusted if the effect on characteristics of isolator is
not significant. In the case of scale A in Table 2, the thickness of the plate is computed as 1,1 mm and
1,2 mm is adopted for the test piece.
Number of the test pieces required is not specified in the text. The recommended number of the test
pieces is shown in Table 3 when each test piece is tested individually. In the case that double-shear
testing arrangement is used for determining the shear properties, it is recommended that two tests are
performed and the number of test pieces doubled.
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ISO/TS 22762-4:2014(E)
Table 3 — Recommended number of test pieces for each test item
Properties Number of test pieces
Compressive properties 2
Shear properties 2
Shear strain dep. 2
Dependency of shear
Compressive stress dep. 2
properties
Others 1
Dependency of compressive properties 1
Ultimate properties 1
Durability 1
In the case shown in Table 4, the available previous test results can be used for substitution of the test
required for the newly designed isolator.
Table 4 — An example of available previous type test results: Comparison of characteristics
between newly designed and previously tested isolator
Previously Newly designed Newly designed
Characteristics Remarks
tested isolator isolator (-) isolator (+)
Outer diameter, d (mm) 1 100 1 000 1 200 within ±10 %
o
Inner diameter, d (mm) 25 25 27 within ±10 %
i
Thickness of one rubber 7,0 6,7 7,5 within ±10 %
layer, t ( mm)
r
Thickness of reinforcing 4,4 4,4 4,8 within ±10 %
plate, t (mm)
s
Number of rubber layer, n 30 30 30 same
First shape factor, S 38,4 36,4 42,0 within ±10 %
1
Second shape factor, S 5,2 5,0 5,3 within ±10 %
2
Maximum comp. stress for 30 25 30 Previous test more
test, σ (MPa) severe condition
max
Minimum comp. stress for -0,5 5,0 0,5 Previous test more
test, σ (MPa) severe condition
min
Maximum shear strain for 3,5 3,0 3,2 Previous test more
test, γ severe condition
max
6.3 Functional requirements
No guidance is given.
6.4 Design compressive force and design shear displacement
Design compressive force refers to the force under non-seismic conditions.
Any specification or guidance is not given regarding nominal stress, σ . Recommended process to
nom
specify σ is given as follows:
nom
a) σ is determined in the range less than 30 % of critical stress, σ . Maximum σ is less than or
nom cr nom
equal to 15 MPa.
b) Adequacy of σ is verified so that compressive stress dependency (change of shear property
nom
under 0,5 σ and 2,0 σ ) is acceptable. Maximum σ is less than or equal to 15 MPa.
nom nom nom
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ISO/TS 22762-4:2014(E)
6.5 Performance requirements
Examples of tests for each requirement are introduced.
6.5.1 General
No guidance is given.
6.5.2 Compressive properties
Example for 6.5.2 of ISO 22762-3 on compressive properties is given.
6.5.2.1 In case of HDR
a) Test piece and test conditions
Test piece is shown in Table 5.
Table 5 — Test isolators (scaled isolator)
Outer Inner Second Compressive
First shape Number of
Type diameter diameter shape stress
factor test isolator
2
(mm) (mm) factor (N/mm )
HDR 700 15 36,4 5,0 12,0 1
Test conditions are given below:
— compressive stress amplitude: 12 MPa ± 30 %;
— number of cycles: 3 cycles;
— compressive stiffness, K , is computed from 3rd cycle.
v
b) Test result
The result for one type of HDR is plotted in Figure 1 and Table 6.
Figure 1 — Compressive property test of HDR
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ISO/TS 22762-4:2014(E)
Table 6 — Test results
Characteristics Test result
Compressive stiffness, K 4 592,0 kN/mm
v
6.5.3 Shear properties
Example for 6.2.2 of ISO 22762-3 on shear properties is given.
6.5.3.1 In case of HDR
a) Test piece and test conditions
Test piece is shown in Table 7.
Table 7 — Test isolators (scaled isolator)
Outer Inner Second Compressive
First shape Number of
Type diameter diameter shape stress
factor test isolator
2
(mm) (mm) factor (N/mm )
HDR 700 15 36,4 5,0 12,0 1
Test conditions are given below:
— compressive stress: 12 MPa;
— shear strain amplitude: ±100 % (141 mm);
— number of cycles: 3 cycles;
— shear stiffness, K , and damping ratio, h , are computed from 3rd cycle.
h eq
b) Test results
The result for one type of HDR is shown in Figure 2 and Table 8.
Figure 2 — Shear property test of HDR
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ISO/TS 22762-4:2014(E)
Table 8 — Test piece
Characteristics Test result
Shear stiffness, K 4 592,0 kN/mm
h
Equivalent damping ration, h 0,21
eq
6.5.4 Tensile properties
Example for 6.5.4 of ISO 22762-3 on shear properties is given.
6.5.4.1 In case of LNR
a) Test piece and test conditions
Test pieces are shown in Table 9.
Table 9 — Test piece
Outer diameter
Type S S
1 2
(mm)
500 32,0 5,1
LNR
800 31,7 5,1
b) Test results
Test results are shown in Figures 3 a) and b) and Table 10.
a) relationship of tensile stress and tensile
b) measurement of tensile yield stress
strain of LNR under shear-strain offset of 100%
Figure 3 — Tensile performance at γ = 100 %
Table 10 — Test results
Tensile yield stress
Outer diameter
under shear strain of 100%
(mm)
(MPa)
500 1,25
800 1,19
6.5.4.2 In case of HDR
a) Test piece and test conditions
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ISO/TS 22762-4:2014(E)
Test pieces are shown in Table 11.
Table 11 — Test piece
Outer diameter
Type S S
1 2
(mm)
800 36,1 4,0
HDR
600 36,6 3,0
b) Test results
Test results are shown in Figures 4 a) and b) and Table 12.
a) relationship of tensile stress and tensile b) measurement of tensile yield stress
strain of HDR under shear-strain offset of 100%
Figure 4 — Tensile performance at γ = 100 %
Table 12 — Test results
Tensile yield stress under
Outer diameter
shear strain of 100%
(mm)
(MPa)
800 1,2
600 1,4
6.5.5 Dependencies of shear properties
6.5.5.1 Shear strain dependency
Example for 6.5.5.1 of ISO 22762-3 on shear strain dependency is given.
6.5.5.1.1 In case of HDR
a) Test piece and test conditions
1) Scaled model
Test pieces of scaled model are shown in Table 13.
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ISO/TS 22762-4:2014(E)
Table 13 — Test isolators (scaled model)
Compressive Number of
Outer dia. First shape Second shape
Type stress isolators
(mm) factor factor
2
(N/mm ) tested
225 35,2 3,3 9,3 1
HDR 225 35,2 5,0 15,0 2
225 35,2 8,3 15,0 1
Test conditions are given below:
— test vibration frequency: 0,33 Hz, sinusoidal wave;
— shear strain amplitude: γ = ±10 %, ±20 %, ±50 %, ±100 %, ±150 %, ±200 %, and ±270 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle;
— test results were corrected to the corresponding value of the property at 20 °C by the specified
method in ISO 22762-3, 6.5.3.3.3.
2) Full scale isolators
Test pieces of full scale isolators are shown in Table 14.
Table 14 — Test isolators (full scale)
Compressive Number of
Outer dia. First shape Second shape
Type stress isolators
(mm) factor factor
2
(N/mm ) tested
600 36,6 3,0 6,6 1
800 36,1 4,0 12,1 1
HDR 1 000 36,4 5,0 15,0 1
1 200 35,8 6,0 15,0 1
1 600 36,5 6,4 15,0 1
Test conditions are given below and in Table 15.
— test wave: triangular wave;
— shear strain amplitude: γ = ±50 %, ±100 %, and ±200 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle;
— test results were corrected to their counterpart with 0,33 Hz by the specified method in ISO 22762-3,
6.5.5.3;
— test results were corrected to the corresponding value of the property at 20 °C by the specified
method in ISO 22762-3, 6.5.5.5.
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ISO/TS 22762-4:2014(E)
Table 15 — Test velocities
Test velocity
(mm/sec)
[frequency (Hz)]
±50 % ±100 % ±200 %
13,0 (0,033) 13,0 (0,017) 10,0 (0,006)
b) Test results
1) Scaled model
Figure 5 shows the test results by the scaled model specimens.
Figure 5 — Shear strain dependency of shear properties of HDR (scaled isolator)
The shear strain dependence of the shear properties (shear modulus, damping, and u function introduced
in ISO 22762-1, Annex E) of HDR, as measured in dynamic loading tests are expressed by polynomial
functions of shear strain, as shown in Table 16.
Table 16 — An example of function for HDR
Properties at γ = 100 % Polynomial function
23 4
2
GG()γγ=×(,2 855−+3,,878 2 903γγ−+1,,016 0 1364γ )
G = 0,62 (N/mm )
eq eq eq
23
H = 0,240
eq
HH()γγ=×(,0 9150+−0,,2364 0 1804γγ+0,)02902
eq eq
u = 0,408
0
23
uu()γγ=×(,0 9028+−0,,2711 0 2083γγ+0,)03421
00
c) Full scale isolator
The test results for the full scale isolators are shown in Table 17.
Table 17 — Test result: Horizontal characteristics normalized by value at 100 % strain
Shear strain
Diameter
Items
(mm)
±50 % ±200 %
K 1,40 0,84
eq
600
H 0,98 0,95
eq
K 1,27 0,91
eq
800
H 0,96 0,95
eq
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ISO/TS 22762-4:2014(E)
Table 17 (continued)
Shear strain
Diameter
Items
(mm)
±50 % ±200 %
K 1,37 0,91
eq
1 000
H 0,98 0,91
eq
K 1,38 0,89
eq
1 200
H 0,95 0,95
eq
K 1,35 0,91
eq
1 600
H 0,95 0,95
eq
6.5.5.2 Compressive stress dependency
Example for 6.5.5.2 of ISO 22762-3 on compressive stress dependency is given.
6.5.5.2.1 In case of HDR
a) Test piece and test conditions
Test pieces are shown in Table 18.
Table 18 — Test piece
Outer Inner Nominal compressive Total thickness
Type diameter diameter S S stress, σ of rubber
1 2 s
2
(mm) (mm) (N/mm ) (mm)
600 (15) 15 36,6 3,0 6,6 200
HDR 800 (20) 20 36,1 4,0 12,1 200
1 200 (55) 55 35,8 6,0 15,0 200
Test conditions are given below:
— shear strain amplitude: γ = 100 (%);
— reference cycle: 3rd (cycle).
b) Test results
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ISO/TS 22762-4:2014(E)
Test results are shown in Table 19, Figures 6 a) and b).
a) compressive stress dependency on shear b) compressive stress dependency on equiva-
modulus G lent damping ratio H
eq eq
Figure 6 — Compressive stress dependency
Table 19 — Change in horizontal characteristics with respect to values at compressive stress, σ
s
Outer diameter Effect of compressive stress
Characteristics
(mm)
σ = 0,5σ σ = 2σ
s s
K 3,89 % −4,39 %
eq
600 (15)
H −2,30 % 12,6 %
eq
K 2,13 % −6,81 %
eq
800 (20)
H −4,76 % 21,5 %
eq
K −3,06 % −8,47 %
eq
1 200 (55)
H −10,5 % 11,6 %
eq
6.5.5.3 Frequency dependency
Example for 6.5.5.3 of ISO 22762-3 on frequency dependency is given.
6.5.5.3.1 In case of HDR
a) Test piece and test conditions
Test piece is shown in Table 20. Shear block specimen can be used for the test.
Table 20 — Test isolators (scaled isolator)
Outer diameter First shape Second shape Compressive stress Number of test
Type
2
(mm) factor factor (N/mm ) isolator
HDR 225 35,2 5,0 15,0 2
Test conditions are given below:
— test vibration frequency: 0,01 Hz, 0,03 Hz, 0,1 Hz and 0,33 Hz, sinusoidal wave;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 3 cycles, respectively;
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ISO/TS 22762-4:2014(E)
— reference cycle: 3rd cycle;
— test results were corrected to the corresponding value of the property at 23 °C by the specified
method in ISO 22762-3, 6.5.5.5.
b) Test results
Test results are plotted in Figure 7.
Figure 7 — An example of frequency dependency test results of HDR
The test result for each frequency is normalized by the result for the isolation frequency. By curve-fitting
the results, correction factors that convert shear property values obtained at the testing frequency to
values at the isolation frequency can be determined. Correction factors for loading frequency, f, can be
derived as follows:
For shear stiffness:
1
α = (1)
κ
aflog( )+b
κκ
For equivalent damping ratio:
1
α = (2)
h
aflog( )+b
hh
where
α is the correction factor for shear stiffness, K ;
k eq
α is the equivalent damping ratio, H ;
h eq
f is the loading frequency.
The values for a , b , a , and b , which are obtained from test results on a scaled model specimen are
k k h h
shown in Table 21 for one type of HDR.
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ISO/TS 22762-4:2014(E)
Table 21 — An example of frequency correction factor
Isolation
a b a b
k k h h
frequency
0,33 Hz 0,144 1,07 0,059 4 1,010
The test results are corrected for frequency by multiplying the results of the shear property test by α
k
and α .
h
For shear stiffness:
KK(,033Hz)(=⋅f:testfrequency) α (3)
eq eq k
For equivalent damping ratio:
HH(,033Hz)(=⋅f:testfrequency) α (4)
eq eq h
6.5.5.3.2 In case of LRB
a) Test piece and test conditions
Test piece are shown in Table 22. Shear block specimen is also available for this test.
Table 22 — Test isolators (scaled isolator)
Outer Lead plug Second Compressive
First shape Number of test
Type diameter diameter shape stress
factor isolator
2
(mm) (mm) factor (N/mm )
LRB 208 41,6 28,9 4,8 7,8 2
Test conditions are given below:
— test vibration frequency: 0,01 Hz, 0,03 Hz, 0,1 Hz, and 0,33 Hz, sinusoidal wave;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle;
— test results were corrected to the corresponding value of the property at 23 °C by the specified
method in ISO 22762-3, 6.5.5.5.
b) Test results
The results for one type of LRB are plotted in Figure 8.
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ISO/TS 22762-4:2014(E)
Key
Qd sine wave
Qd* sine wave, f =0,33 Hz
Figure 8 — An example of frequency dependency test results of LRB
The correction factor for frequency, f, can be derived using Formula (5).
For characteristic strength, Q :
d
1
α = (5)
Qd
aflog( )+b
QQ10
where
α is the correction factor for characteristic strength, Q ;
Qd d
f is the loading frequency.
The values for a and b , which are obtained from test results on a scaled model specimen are shown
Q Q
in Table 23 for one type of LRB.
Table 23 — An example of frequency correction factor
Isolation
a b
Qd Qd
frequency
0,33 Hz 0,0829 1,049
The test results are corrected for frequency by multiplying the results of the shear property test by α .
Qd
For characteristic strength, Q :
d
QQ(,033Hz)(=⋅f:testfrequency) α (6)
dd k
6.5.5.3.3 In case of LNR
a) Test piece and test conditions
Test piece is shown in Table 24.
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ISO/TS 22762-4:2014(E)
Shear block specimen can be used for the test.
Table 24 — Test isolators (scaled isolator)
Outer Inner Second Compressive
First shape Number of test
Type diameter diameter shape stress
factor isolator
2
(mm) (mm) factor (N/mm )
LNR 253 29 20,0 7,0 10,0 2
Test conditions are given below:
— test vibration frequency: 0,01 Hz, 0,25 Hz, 0,5 Hz, and 1,0 Hz, sinusoidal wave;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle;
— test results were corrected to the corresponding value of the property at 23 °C by the specified
method in ISO 22762-3, 6.5.5.5.
b) Test results
The results for one type of LNR are plotted in Figure 9.
Figure 9 — An example of frequency dependency test results of LNR
Frequency dependency of LNR is negligible. Generally, no correction for frequency is required.
6.5.5.4 Repeated loading dependency
Example for 6.5.5.4 of ISO 22762-3 on repeated loading dependency is given.
6.5.5.4.1 In case of HDR
a) Test piece and test conditions
Test piece is shown in Table 25.
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ISO/TS 22762-4:2014(E)
Table 25 — Test isolators (scaled isolator)
Outer Inner Second Compressive
First shape Number of
Type diameter diameter shape stress
factor test isolator
2
(mm) (mm) factor (N/mm )
HDR 700 15 36,4 5,0 12,0 1
Test conditions are given below:
— test vibration frequency: 0,008 Hz, triangle wave;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 50 cycles;
— reference cycle: 3rd cycle;
— test results were corrected to the corresponding value of the property at 23 °C by a specified
method.
b) Test results
The results are given in Figure 10 and Table 26.
rd th
a) Hysteresis loop (3 cycle) b) Hysteresis loop (30 cycle)
Figure 10 — Repeated loading dependency of shear characteristics
Table 26 — Effect of repeated cycling [values normalized by corresponding value after third
cycle (same correction as other part)]
Number of
K H
eq eq
cycles
3 1,000 1,000
5 0,99 0,99
10 0,98 0,97
30 0,95 0,95
50 0,94 0,92
6.5.5.5 Temperature dependency
Example for 6.5.5.5 of ISO 22762-3 on temperature dependency is given.
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ISO/TS 22762-4:2014(E)
6.5.5.5.1 In case of HDR
a) Test piece and test conditions
Test piece is shown in Table 27. Shear block specimen can be used for the test.
Table 27 — Test isolators (scaled isolator)
Outer diameter First shape Second shape Compressive stress Number of test
Type
2
(mm) factor factor (N/mm ) isolator
HDR 225 35,2 5,0 15,0 3
Test conditions are given below:
— test vibration frequency: 0,33 Hz, sinusoidal wave;
— test temperature: −10 °C, 0 °C, 23 °C, 30 °C, and 40 °C;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle.
b) Test results
The results for one type of HDR are plotted in Figure 11.
Figure 11 — An example of temperature dependency test results of HDR
The result at each temperature is normalized by the result for 23 °C.
Curve-fitting of the data gives a function expressing the dependence of the shear property on the
temperature, T °C. Hence, a factor converting the value obtained at T °C to that, at 23 °C, can be derived
as follows:
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ISO/TS 22762-4:2014(E)
For shear modulus:
1
β = (7)
k
23
ab++TcTd+ T
For equivalent damping ratio:
1
β = (8)
h
23
ef++TgTh+ T
The values for a, b, c, d, e, f, g, and h for one type of HDR are shown in Table 28.
Table 28 — An example of temperature correction factor
a B c d
−2 −4 −6
1,224 −1,892 × 10 6,087 × 10 −9,135 × 10
e F g h
−3 −4 −6
1,076 −4,175 × 10 1,107 × 10 −3,133 × 10
The test results can be corrected for temperature by multiplying the results of the shear property test
by β and β .
k h
For shear stiffness:
KK23 °C:= T test temperature ⋅β (9)
( ) ()
eq eq k
For equivalent damping ratio:
HH23 °C:= T test temperature ⋅β (10)
( ) ()
eq eq h
6.5.5.5.2 In case of LRB
a) Test piece and test conditions
Test specimen is shown in Table 29.
Table 29 — Test isolators (scaled isolator)
Outer Lead plug Second Compressive
First shape Number of test
Type diameter diameter shape stress
factor isolator
2
(mm) (mm) factor (N/mm )
LRB 250 38 41,7 4,8 6,2 2
Test conditions are given below:
— test vibration frequency: 0,33 Hz, sinusoidal wave;
— test temperature: −10 °C, 0 °C, 23 °C, 30 °C, 40 °C;
— shear strain amplitude: γ = ±100 %;
— loading cycles: 3 cycles, respectively;
— reference cycle: 3rd cycle.
b) Test results
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ISO/TS 22762-4:2014(E)
The results for one type of LRB are plotted in Figure 12.
a) b)
Figure 12 — An example of temperature dependency test results of LRB
The result at each temperature is normalized by the result for 23 °C.
Curve-fitting the data gives a function expressing the dependence of the shear property on the
temperature, T °C. Henc
...
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