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1、INTERNATIONAL STANDARD IS0 527-4 First edition 1997-04-15 Plastics - Determination of tensile properties - Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites Plastiques - DBtermination des propri a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii INT
2、ERNATIONAL STANDARD IS0 IS0 527-4:1997(E) Plastics - Determination of tensile properties - Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites 1 Scope 1 .l This part of IS0 527 specifies the test conditions for the determination of the tensile properties of isot
3、ropic and orthotropic fibre-reinforced plastic composites, based upon the general principles given in part 1. Unidirectionally reinforced materials are covered by part 5. 1.2 See IS0 527-1, subclause 1.2. 1.3 The test method is suitable for use with the following materials: - fibre-reinforced thermo
4、setting and thermoplastic composites incorporating non-unidirectional reinforcements such as mats, woven fabrics, woven rovings, chopped strands, combinations of such reinforcements, hybrids, rovings, short or milled fibres or preimpregnated materials (prepregs) (for directly injection-moulded speci
5、mens, see specimen 1 A in IS0 527-2:1993); - combinations of the above with unidirectional reinforcements and multidirectional reinforced materials constructed from unidirectional layers, provided such laminates are symmetrical (for materials with completely, or mainly, unidirectional reinforcements
6、, see IS0 527-5); - finished products made from these materials. The reinforcement fibres covered include glass fibres, carbon fibres, aramid fibres and other similar fibres. 1.4 The method is performed using specimens machined from a test panel made in accordance with IS0 1268 or by equivalent meth
7、ods, or from finished and semi-finished products with suitable flat areas. 1.5 See IS0 527-1, subclause 1.5. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 527. At the time of publication, the edition
8、s indicated were valid. All standards are subject to revision, and parties to agreements based on this par-l of IS0 527 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid In
9、ternational Standards. IS0 527-l :1993, Plastics - Determination of tensile properties - Pan 1: Genera/principles. IS0 527-4: 1997(E) IS0 IS0 527-2:1993, Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics. IS0 527-W 997, Plastics - Determinat
10、ion of tensile properties - Part 5: Test conditions for unidirectional fibre- reinforced plastic composites. IS0 1268:1974, Plastics - Preparation of glass fibre reinforced, resin bonded, low-pressure laminated plates or pane/s for test purposes. IS0 2818:1994, Plastics - Preparation of test specime
11、ns by machining. IS0 3534-l :1993, Statistics - Vocabulary and symbols - Part 7: Probability and general statistical terms. 3 Principle See IS0 527-1, clause 3. 4 Definitions For the purposes of this part of IS0 527, the following definitions apply. 4.1 gauge length: See IS0 527-1, subclause 4.1. 4.
12、2 speed of testing: See IS0 527-l) subclause 4.2. 4.3 tensile stress, cr (engineering): See IS0 527-1, subclause 4.3, except that CT for “l”-direction specimens is defined as 01 and for “2”-direction specimens as cr2 (see 4.8 for definitions of these directions). 4.3.1 tensile strength, 0: See IS0 5
13、27-1, subclause 4.3.3, except that oM for “1”-direction specimens is defined as ml and for “P-direction specimens as c$ tensile failure strain, Young s modulus, E: See IS0 527-1, subclause 4.6, except that E for “l”-direction specimens is defined as Et and for “T-direction specimens as E2. The strai
14、n values used are as given in IS0 527-1, subclause 4.6, i.e. E = 0,000 5 and E” = 0,002 5 (see figure l), unless alternative values are given in the material or technical specifications. 4.7 Poisson s ratio, ,u: See IS0 527-1, subclause 4.7, except that for “1 -direction specimens pb is defined as 1
15、2 and j b) 2 mm/min for qualification tests, when measuring the maximum elongation, when determining the tensile modulus of elasticity. 9.6.2 For type 2 and type 3 test specimens a) 5 mm/min for routine quality control; b) 2 mm/min for qualification tests, when measuring the maximum elongation, when
16、 determining the tensile modulus of elasticity. 9.7 Recording of data See IS0 527-1, subclause 9.7. 10 Calculation and expression of results See IS0 527-l) clause 10, except that the definitions given in clause 4 of this part of IS0 527 apply and strain values shall be reported to three significant
17、figures. If Poisson s ratio is required, calculate it at the strain values given in 4.6. 7 IS0 52741997(E) IS0 11 Precision The precision of this test method is not known because interlaboratory data are not available. When interlaboratory data are obtained, a precision statement will be added with
18、the following revision. The precision data will be specific to particular combinations of fibre and matrix types. 12 Test report The test report shall include the following information: a) a reference to this part of IS0 527, including the type of specimen and the test speed, written in the followin
19、g format: Tensile test IS0 527k/2/5 Type of specimen- Test speed in millimetres per minute b) to q) see IS0 527-l) clause 12, b) to q), including fibre type, fibre content and fibre geometry (e.g. mat) in 12b). 6 IS0 Annex A (normative) Specimen preparation IS0 527-4: 1997(E) A.1 Machining the speci
20、mens In all cases take the following precautions: - Avoid working under conditions that would create a large build-up of heat in the specimen (the use of a coolant is recommended). If a liquid coolant is used, dry the specimens immediately after machining. - Check that all cut surfaces of the specim
21、en are free from machining defects. A.2 Preparation of specimens with bonded end tabs A recommended method is as follows: Cut out from the material under test a sheet having the length of the intended specimens and of a width suitable for the number of specimens required. Identify the “1”-direction
22、of the material in the sheet. Cut out rectangular strips of the required length and width for the tabs. Attach the strips to the sheet as follows: a) W d d) e) If required, rub with fine abrasive paper or blast with suitable sand all the surfaces to which adhesive will be applied. Remove all dust fr
23、om these surfaces and clean them with a suitable solvent. Bond the strips in place along the ends of the sheet, parallel to each other and normal to the length direction of the specimens, as shown in figure A.l, using a high-stretch adhesive and strictly following the adhesive manufacturer s instruc
24、tions. NOTE - It is recommended that a film adhesive with a thin carrier be used. The adhesive should preferably have a shear strength greater than 30 MPa. It is desirable that the adhesive used be flexible in nature, with an elongation at break greater than that of the material under test. Keep the
25、 bonded parts at the pressure and temperature recommended by the adhesive manufacturer for the time recommended by the manufacturer. Cut the sheet, together with the strips constituting the end tabs, into test specimens (see figure A.l). 9 IS0 IS0 527-4:1997(E) waste Figure A.1 - Tabbed panel for sp
26、ecimen preparation 10 Q IS0 Annex B (informative) Alignment of specimens IS0 527-4:1997(E) It is recommended that the alignment of the tensile-testing machine and the test specimen be checked at the centre of the gauge length using a strain-gauged coupon of the same material as is to be tested. Use
27、a device or procedure which ensures that specimens are positioned in the grips in a repeatable manner. Strain-gauge the coupon as shown in figure B.1, attaching two gauges (SGl, SG2) to one face of the coupon approximately, one- eighth of the specimen width from the edge and midway between the tabs
28、and attaching a third gauge (SG3) on the centreline of the opposite face also midway between the tabs. Compare the output of the gauges at the mid-point of the strain range used to measure Young s modulus, i.e. at 0,001 5 for the strain values given in 4.6. Using equations (B.l) and (B.2), calculate
29、 the bending strain, expressed as a percentage, in the width (Bb) and thickness (Bh) directions, respectively. B b = 4lQ - 4 x 100 . . . 3%“ B h =lEav - G3 Figure B.l - Strain-gauge locations (SGl, SG2 and SG3) for system alignment check 11 IS0 527-4:1997(E) 0 IS0 ICS 83.120 Descriptors: plastics, reinforced plastics, tests, tension tests, determination, tensile properties, testing conditions, test specimens. Price based on 11 pages
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