1、October 2014 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 83.100!%;w)“2248406www.din.deDDIN EN ISO 3385Flexible cellular polymeric materials Determination of fatigue by constant-load pounding (ISO 3385:2014);English version EN ISO 3385:2014,English translation of DIN EN ISO 3385:2014-10Weich-elastische polymere Schaumstoffe Bestimmung der Ermdung im Daue
3、rschwingversuch mit Stobelastung unter konstanterKraft (ISO 3385:2014);Englische Fassung EN ISO 3385:2014,Englische bersetzung von DIN EN ISO 3385:2014-10Matriaux polymres alvolaires souples Dtermination de la fatigue par indentation charge constante (ISO 3385:2014);Version anglaise EN ISO 3385:2014
4、,Traduction anglaise de DIN EN ISO 3385:2014-10SupersedesDIN EN ISO 3385:2010-06www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 18 pages09.14 DIN EN ISO 3385:2014-10 2 A comma is used as the decimal marker. National foreword This docume
5、nt (EN ISO 3385:2014) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee ISO/TC 249 “Plastics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the DIN-Normenausschuss Materialprfung (DIN S
6、tandards Committee Materials Testing), Working Committee NA 062-04-37 AA Prfung weich-elastischer Schaumstoffe. The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 2439 DIN EN ISO 2439 Amendments This standard differs from DIN EN ISO 3385:2010
7、-06 as follows: a) machine type B driven by electro-, pneumatic or hydraulic mechanism has been added and the procedure has been revised accordingly; b) annexes relating to precision have been added. Previous editions DIN 53574: 1960-10, 1967-06, 1977-05 DIN EN ISO 3385: 1995-07, 2008-09, 2010-06 Na
8、tional Annex NA (informative) Bibliography DIN EN ISO 2439, Flexible cellular polymeric materials Determination of hardness (indentation technique) EN ISO 3385July 2014 ICS 83.100 Supersedes EN ISO 3385:1995English Version Flexible cellular polymeric materials - Determination of fatigue by constant-
9、load pounding (ISO 3385:2014) Matriaux polymres alvolaires souples - Dtermination dela fatigue par indentation charge constante(ISO 3385:2014)Weich-elastische polymere Schaumstoffe - Bestimmung der Ermdung im Dauerschwingversuch mit Stobelastung unter konstanter Kraft (ISO 3385:2014) This European S
10、tandard was approved by CEN on 28 June 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning
11、 such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its
12、 own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, German
13、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploi
14、tation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3385:2014 EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMContents Page Foreword . 3 1 Scope . 4 2 Normat
15、ive references. 4 3 Principle 4 4 Apparatus 4 5 Test pieces 7 5.1 Shape and dimensions 7 5.2 Samples showing orientation . 8 5.3 Number 8 5.4 Conditioning . 8 6 Procedure 8 7 Expression of results . 9 7.1 Loss in thickness . 9 7.2 Loss in hardness 10 7.3 Percentage hardness loss . 10 8 Precision . 1
16、0 9 Test report . 10 Annex A (informative) Typical loading cycle . 12 Annex B (informative) Precision . 13 Annex C (informative) Precision study Machine Type B . 15 Bibliography 16 2DIN EN ISO 3385:2014-10 EN ISO 3385:2014 (E) ForewordThis document (EN ISO 3385:2014) has been prepared by Technical C
17、ommittee ISO/TC 45 Rubber and rubber products in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest
18、by January 2015, and conflicting national standards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such
19、 patent rights. This document supersedes EN ISO 3385:1995. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
20、Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text
21、of ISO 3385:2014 has been approved by CEN as EN ISO 3385:2014 without any modification. “”3DIN EN ISO 3385:2014-10EN ISO 3385:2014 (E)1 ScopeThis International Standard specifies a method for the determination of loss in thickness and loss in hardness of flexible cellular materials intended for use
22、in load-bearing applications such as upholstery.It provides a means of assessing the service performance of flexible cellular materials based on rubber latex or polyurethane used in load-bearing upholstery.The method is applicable both to standard size test pieces cut from slabstock material and to
23、shaped components. The measured loss in thickness and loss in hardness are related to, but are not necessarily the same as, the losses likely to occur in service.This international Standard is not intended to function as a detailed engineering design specification for fatigue apparatus. 2 Normative
24、referencesThe 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) applie
25、s.ISO 2439:2008, Flexible cellular polymeric materials Determination of hardness (indentation technique)3 PrincipleRepeated indentation of a test piece by an indentor smaller in area than the test piece, the maximum load reached during each cycle being kept within specified limits. The typical loadi
26、ng cycle is shown in Figure A.1.4 Apparatus4.1 Pounding test machine of either Type A (see 4.2) or Type B (see 4.3), having the following parts.4.1.1 Plane platen, capable of fully supporting the test piece, and suitably vented with holes approximately 6 mm in diameter at approximately 20 mm pitch i
27、n order to allow air to escape from the test piece.4.1.2 Indentor, having an overall diameter of 250 mm 1 mm with a 25 mm 1 mm radius at its lower edge, provided with a device for applying a maximum force of 750 N 20 N during the loading cycle. The indentor shall be rigidly fixed to its guide and it
28、s surface shall be smooth but not polished.The machine shall be capable of oscillating either the platen (4.1.1) carrying the test piece, or the indentor towards the other in a vertical direction at a rate of (70 5) strokes per minute. The amplitude of the stroke shall be adjustable.The indentor sha
29、ll be linked to a re-settable counting device which displays the number of compression cycles performed during the test.4DIN EN ISO 3385:2014-10 EN ISO 3385:2014 (E) 4.1.3 Indentor drive mechanism, capable of applying the maximum force of 750 N 20 N for no more than 10 % of the total duration of eac
30、h cycle.4.2 Machine Type A, in its simplest form the mechanism comprises a crank drive and suspended weight. The weight shall be supported throughout the loading cycle except at that part of the stroke when the mounting and platen are closest together. At this point, the full force of the indentor s
31、hall be supported by the test piece; this shall not be for more than 10 % of the full machine cycle. This type of device is shown schematically in Figure 1 a) and Figure 1 b). The moving platen (5) shall be fitted with appropriate means to locate the test piece and prevent its lateral movement durin
32、g the test.a) Full loading point b) Zero load pointKey1 load frame2 indentor mounting3 indentor4 test piece5 moving platen6 drive shaft/camFigure 1 Example of an arrangement of machine Type A with manual adjustment4.3 Machine Type B, a fully controlled device driven by electro-, pneumatic or hydraul
33、ic mechanism, equipped with load cell and means to provide the necessary indentation frequency and peak force. The generic form of machine Type B is illustrated schematically in Figure 2. Figure 3 is an outline drawing of one of the commercially available machines, but is not meant to exclude other
34、machines that comply with the essential requirements.The apparatus shall be capable of measuring the maximum force with a precision of 1 %. Compliance with specified limits shall be provided by graphical or other visual display.5DIN EN ISO 3385:2014-10EN ISO 3385:2014 (E)Key1 load frame2 actuator (e
35、lectro-mechanical, pneumatic or servo-hydraulic)3 indentor4 test piece5 support platen6 load cellFigure 2 Examples of diagrammatic arrangements of machine Type B with fully automatic adjustment a) Generic design6DIN EN ISO 3385:2014-10 EN ISO 3385:2014 (E) Key1 beam2 electromechanical, pneumatic or
36、hydraulic cylinder3 flow control valve4 load cell adapter5 load cell6 indentor7 test piece8 base plateFigure 3 Examples of diagrammatic arrangements of machine Type B with fully automatic adjustment b) Example of one commercially available apparatusType B machines shall be equipped with a force-meas
37、urement device, whereby the maximum load applied to the test piece by the indentor during every cycle shall be measured. The maximum force shall be controlled within 750 N 20 N tolerance throughout the full duration of the pounding process.The support platen (5) or base plate (8) (as appropriate) sh
38、all be fitted with appropriate means to locate the test piece and prevent its lateral movement during the test.5 Test pieces5.1 Shape and dimensionsTest pieces shall be right parallelepipeds having sides of length 380 mm 20 mm and a thickness of 50 mm 2 mm. Tests may also be conducted on components
39、that do not comply with these dimensions subject to agreement between the interested parties.7DIN EN ISO 3385:2014-10EN ISO 3385:2014 (E)5.2 Samples showing orientationNormally, testing shall be conducted in that direction in which the finished product will be stressed under service conditions. If m
40、aterials show cell structure orientation, the direction in which the indentation is applied may be agreed between the interested parties.5.3 NumberThree test pieces shall be tested.5.4 Conditioning5.4.1 Material shall not be tested less than 72 h after manufacture, unless at either 16 h or 48 h afte
41、r manufacture it can be demonstrated that the result does not differ by more than 10 % from that obtained after 72 h. Testing is permitted at either 16 h or 48 h if, at the specified time, the above criterion has been satisfied.5.4.2 Prior to the test, the test pieces shall be conditioned, undistort
42、ed, for at least 16 h in one of the specified atmospheres as follows:a) 23 C 2 C, 50 % 5 % relative humidity, orb) 27 C 2 C, 65 % 5 % relative humidity.This period can form the latter part of the period following manufacture.6 Procedure6.1 Testing shall be conducted in a climate controlled atmospher
43、e as specified in 5.4.6.2 Perform all measurements on the same surface of the test specimen.6.3 Measure the thickness, d1, and its hardness index as specified in ISO 2439:2008, Method A.6.4 Machine Type A: Place the test piece concentrically under the indentor, adjust the stroke to be equal to the t
44、hickness of the test piece with a tolerance of 10 % and adjust the relative separation of the indentor and platen, until the specified load of 750 N 20 N is applied. The correct loading is achieved when the indentor is just lifted in its mounting and is completely unsupported.As the foam softens dur
45、ing pounding, it is necessary for the indentor position to be continuously adjusted during the test sequence to maintain the above test load of 750 N 20 N.6.5 Machine Type B: Place the test piece concentrically under the indentor and set the indentor speed to provide an indentation frequency of (70
46、5) strokes per minute in a way that approximates to a triangular or sinusoidal travel-time sequence.Apply contact between indentor and specimen and, within the first 10 preliminary loading cycles, bring peak load and dwell time under control within specified limits. The maximum allowed force of 770
47、N shall not be exceeded at any time during the test. The dwell time at peak load shall not exceed 10 % of the full period time of the indentation cycle throughout the whole test.During the test, ensure that the peak load of 750 N 20 N is constantly within tolerance by appropriate adjustment e.g. of
48、the stroke or test speed. The indentor shall be completely discharged in each loading cycle of the test.8DIN EN ISO 3385:2014-10 EN ISO 3385:2014 (E) 6.6 Run the machine for 80 000 continuous load cycles and then remove the test piece from the machine and allow it to rest in an unstrained state for
49、10 min 0,5 min, before performing fresh measurements on the fatigued area as described in 6.7.6.7 Re-measure the thickness d2of the test piece as specified in ISO 2439 and then carry out the measurement of hardness index at (40 1) % indentation as specified in Subclauses 7.2 and 7.3 (method A) of ISO 2439:2008, except that the (40 1) % indentation level shall be calculated using the original thickness measurement d1.
