1、DEUTSCHE NORM Februarv 1998 Fi bre-rei nforced plastic composites Determination of apparent interlaminar shear strength I DIN by short-beam method - I EN IS0 14130 (IS0 14130 : 1997) English version of DIN EN IS0 14130 ICs 83.1 20 Descriptors: Plastics, fibre-reinforced plastic composites, testing.
2、Supersedes DIN 53397, September 1974 edition. Faserverstrkte Kunststoffe - Bestimmung der scheinbaren inter- laminaren Scherfestigkeit nach dem Dreipunkt-Verfahren mit kurzem Balken (IS0 141 30 : 1997) European Standard EN IS0 14130 : 1997 has the status of a DIN Standard. A comma is used as the dec
3、imal marker. National foreword This standard has been published in accordance with a decision taken by CEN/TC 249 to adopt, without alteration, International Standard IS0 141 30 as a European Standard. The responsible German body involved in its preparation was the Normenausschu Kunststoffe (Plastic
4、s Technology Standards Committee), Technical Committee Prepregs. DIN EN IS0 291 and DIN EN IS0 281 8 are the standards corresponding to International Standards IS0 291 and IS0 2818, respectively, referred to in clause 2 of the EN. Amendments DIN 53397, September 1974 edition, has been superseded by
5、the specifications of EN IS0 141 30, which is identical to IS0 14130. National Annex NA Standards referred to (and not included in Normative references and Annex ZA) DIN EN IS0 291 Plastics - Standard atmospheres for conditioning and testing (IS0 291 : 1997) DIN EN IS0 2818 Plastics - Preparation of
6、 test specimens by machining (IS0 2818 : 1994) EN comprises 9 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN IS0 14130 : 1998-0 V Deutsches Institut fr Nonung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for Germa
7、n Standards (DIN-Normen). English price group 08 Sales No. 1108 07.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 14130 December 1997 ICs 83.120 Descriptors: Plastics, fibre-reinforced plastic composites, testing. English version Fibre-reinforced plastic composites Determination of appa
8、rent laminar shear strength by short-beam method (IS0 141 30 : 1997) Composites plastiques renforcs de fibres - Dtermination de la rsis- tance au cisaillement interlaminaire apparent par essai de flexion sur appuis rapprochs (IS0 141 30 : 1997) Faserverstrkte Kunststoffe - Bestimmung der scheinbaren
9、 inter- laminaren Scherfestigkeit nach dem Dreipunktverfahren mit kurzem Balken (IS0 141 30 : 1997) This European Standard was approved by CEN on 1997-1 1-23. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
10、 status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German
11、). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark,
12、Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart
13、36, 8-1050 Brussels O 1997. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN IS0 14130 : 1997 E Page 2 EN IS0 14130: 1997 Foreword International Standard IS0 141 30 : 1997 Fibre-reinforced plastic composites - Determination of app
14、arent interlaminar shear which was prepared by ISO/TC 61 ?Plastics? of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 249 ?Plastics?, the Secretariat of which is held by IBN, as a European Standard. This European Standard shall be given the status
15、of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by June 1998 at the latest. In accordance with the CENKENELEC Internal Regulations, the national standards organizations of the follow- ing countries are bound to imple
16、ment this European Standard: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. strength by short-beam method, Endorsement notice The text of the
17、International Standard IS0 141 30 : 1997 was approved by CEN as a European Standard without any modification. 1 Scope 1.1 This International Standard specifies a procedure for determining the apparent interlaminar shear strength of fibre-reinforced plastic composites by the shori-beam method. 1.2 Th
18、e method is suitable for use with fibre-reinforced plastic composites with a thermoset or a thermoplastic matrix, providing interlaminar shear failure is obtained. NOTE - When using other than laminated materials which are not symmetrical and balanced, the results may be affected by various coupling
19、s such as extensionhending, bending/twisting, etc. 1.3 The method is not suitable for the determination of design parameters, but may be used for screening materials, or as a quality-control test. 2 Normative references The following standards contain provisions which, through reference in this text
20、, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editi
21、ons of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 291 :1997, Plastics - Standard atmospheres for conditioning and testing. IS0 1268:1974, Plastics - Preparation of glass fibre reinforced, resin bonded, low-pressure laminat
22、ed plates or panels for test purposes.?) IS0 2602:1980, Statistical interpretation of test results - Estimation of the mean - Confidence interval. IS0 2818:1994, Plastics - Preparation of test specimens by machining. IS0 5893:1993, Rubber and plastics test equipment - Tensile, flexural and compressi
23、on types (constant rate of traverse) - Description. 1) Under revision. Page 3 EN IS0 14130 : 1997 3 Principle A bar of rectangular cross-section is loaded as a simple beam in flexure so that interlaminar shear failure occurs. The bar rests on two supports and the load is applied by means of a loadin
24、g member midway between the supports. NOTES 1 The test is similar in nature to the three-point loading method used to determine the flexural properties of plastics (IS0 141 25, Fibre-reinforced plastic composites - Determination of flexural properties). However, a smaller test span/specimen thicknes
25、s ratio is adopted to increase the level of shear stress relative to the flexural stress in the test specimen to encourage interlaminar shear failure. 2 It is emphasized that the result obtained is not an absolute value. For this reason the term “apparent interlaminar shear strength” is used to defi
26、ne the quantity measured. Test results from different-sized specimens, or from specimens tested under different conditions, are not directly comparable. 4 Definitions For the purposes of this International Standard, the following definitions apply: 4.1 specimen. apparent interlaminar shear stress, z
27、: The interlaminar shear stress acting on the neutral plane of the It is calculated from the relationship given in 10.1 and is expressed in megapascals (MPa). 4.2 apparent interlaminar shear strength, zM: The value of the apparent interlaminar shear stress at failure or when the load reaches a maxim
28、um value. It is expressed in megapascals (MPa). 4.3 span, L: The distance between the two specimen supports in the test machine. It is expressed in millimetres (mm). 4.4 specimen coordinate axes (for aligned materials): The coordinate axes for the material under test are defined in figure 1. The dir
29、ection parallel to the fibre axes is defined as the “1” direction and the direction perpendicular to it the “2 direction. For other materials, the 1, 2 and 3 directions are generally described by the X, y, z system of coordinates. NOTES 1 The “1” direction is also referred to as the O degree (O”) or
30、 longitudinal direction, and the “2 direction as the 90 degree (90”) or transverse direction. 2 A similar definition can be used for material with a preferred fibre lay-up or in cases where a direction (e.g. the lengthwise direction) can be related to the production process (.e. directions A and B i
31、n figure 3). 5 Apparatus 5.1 Test machine 5.1.1 General The machine shall conform to IS0 5893 as appropriate to the requirements given in 5.1.2 and 5.1.3. Page 4 EN IS0 14130: 1997 Figure 1 - Unidirectional reinforced composite plate element showing symmetry axes 5.1.2 Speed of testing The speed of
32、testing v shall be kept constant in accordance with IS0 5893. 5.1.3 Load indicator The load indicator shall be such that the error in the indicated load is less than +_ 1 % of full scale (see IS0 5893). 5.2 Loading member and supports The radius of the loading member r, shall be 5 mm f 0,2 mm and th
33、at of the supports r2 shall be 2 mm I0,2 mm (see figure 2). The width of the loading member and the supports shall be greater than the test specimen width. The loading member shall apply the load mid-way between the supports. The span (distance between the supports) shall be adjustable. 7 Loading me
34、mber i Support / I I Figure 2 - Loading configuration 5.3 Micrometer, or equivalent, capable of reading to 0,Ol mm or less, and suitable for measuring the width h and thickness h of the test specimen. The micrometer shall have contact faces appropriate to the surface being measured (.e. flat faces f
35、or flat, polished surfaces and hemispherical faces for irregular surfaces). Page 5 EN IS014130: 1997 Thickness, h mm 2 I0.2 6 Test specimens Overall length, 1 Width, b mm mm 20+ 1 10 k 0,2 6.1 Shape and dimensions 6.1.1 Standard specimen size Unless 6.1.2 applies, test specimens shall comprise recta
36、ngular bars of uniform thickness with the dimensions given in table 1. Table 1 6.1.2 Other test specimens When it is not possible or not desirable to use the standard specimen, the following rules shall be observed: - the length and the thickness of the test specimen shall be in the same ratio as in
37、 the standard specimen, .e. 1 = 10h - the width shall be chosen in the same ratio to the thickness as in the standard specimen, .e. h = 5h NOTE - Depending upon the material being tested, specimens of 2 mm thickness may fail by shear or experience compression failure under load or exhibit extreme de
38、flection without shear failure. As specimen thickness (height) is increased, the probability of compression failure under load increases and the probability of extreme deflection with no failure decreases. As specimen thickness is decreased, the reverse is true. It is important to select a specimen
39、thickness that will cause specimens to fail by horizontal shear (see 9.7). 6.2 Preparation of specimens Machine the test specimens from a moulded blank or sheet, prepared in accordance with IS0 1268 or another specified/agreed procedure. Some parameters for machining are given in IS0 2818. 6.3 Check
40、ing the test specimens The specimens shall be flat and free of twist. The surfaces and edges shall be free from defects. The thickness along the whole length shall be within rt 5 o/o of the mean thickness. The width of individual specimens shall be constant to within 0,2 mm. Specimens showing measur
41、able or observable departure from one or more of these requirements shall be rejected or machined to the required size and shape before testing. 7 Number of test specimens 7.1 At least five test specimens shall be tested. 7.2 When the fibre orientation and distribution in the material to be tested d
42、oes not differ significantly between the two principal directions, shear specimens shall be taken in each of these two directions (see figure 3, specimens A and B). When the material has a preferred orientation, the specimens shall be taken in this direction. Page 6 EN IS0 14130: 1997 i-”- Figure 3
43、- Location of specimens 8 Conditioning Where applicable, condition the test specimens as specified in the standard for the material under test. In the absence of such information, select the most appropriate conditions from IS0 291, unless agreed otherwise by the interested parties. 9 Procedure 9.1
44、Test atmosphere Conduct the test in the same atmosphere as that used for conditioning unless agreed otherwise by the interested parties (e.g. for testing at elevated or reduced temperatures). 9.2 Measurement of specimen dimensions Measure, at the mid-point of each test specimen, the width of the spe
45、cimen to the nearest 0,02 mm and the thickness to the nearest 0,055 mm. 9.3 Span Set the span L to 5h f 0,3 mm, where h is the mean thickness of the set of specimens (see figure 2). NOTE - For some materials, a shorter span may be necessary to produce interlaminar shear failure (see 9.7). 9.4 Speed
46、of testing Where applicable, set the speed of testing as given in the standard for the material being tested. In the absence of this information, the speed of testing v shall be 1 mm/min $- 0,2 mm/min. 9.5 Actual testing Place the test specimen symmetrically across the two parallel supports with an
47、unmachined surface in contact with the supports (see figure 2). Apply the force uniformly across the width of the test piece by means of the loading member, parallel to and midway between the supports. Page 7 EN IS0 14130 : 1997 9.6 Data collection Record the force throughout the test 9.7 Mode of fa
48、ilure Record the mode of failure using the following classification: Acceptable interlaminar shear failure modes: a) single shear, multiple shear see figure 4a)l. Unacceptable failure modes: b) c) d) mixed modes of failure see figure 4b)l: shear and tension, shear and compression; non-shear modes of
49、 failure see figure 4c)l: tension, compression; plastic shear see figure 4d)l. NOTE - There are two possible failure cases: - for failure by mode “a”, approximately in the plane of the neutral axis, the apparent interlaminar shear strength can be calculated as shown in 10.1; for failure by modes “b and “c”, the result calculated in accordance with 10.1 is not an interlaminar shear strength and may only be used to compare test specimens taken from the same material. - 10 Calculation and expression of results 10.1 Calculate the apparent interlaminar shear strength 7, expre
