ASD-STAN PREN 2747-1990 Aerospace Series Glass Fibre Reinforced Plastics Determination of Tensile Properties (Issue P 1)《航空航天系列 玻璃纤维增强塑料 抗拉特性的测定 第P1版》.pdf
《ASD-STAN PREN 2747-1990 Aerospace Series Glass Fibre Reinforced Plastics Determination of Tensile Properties (Issue P 1)《航空航天系列 玻璃纤维增强塑料 抗拉特性的测定 第P1版》.pdf》由会员分享,可在线阅读,更多相关《ASD-STAN PREN 2747-1990 Aerospace Series Glass Fibre Reinforced Plastics Determination of Tensile Properties (Issue P 1)《航空航天系列 玻璃纤维增强塑料 抗拉特性的测定 第P1版》.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、AECNA PREN2747 70 E 1012311 0004071 5 W 1- I A, E. CI M. A. STAN DAR D prEN 2747 NORME A.E.C.M.A. Issue P 1 A.E.C.M.A. NORM August 1990 Edition approved for publication 1990-08-24 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63
2、-82-85 UDC : Key words : Comments should be sent within six months C7 Chairman after the date of publication decision A.E.C.M.A. 88, Bd. Malecherbes Mr. BEZAUD 75008 PARIS - FRANCE ENGLISH VERSION Aerospace series Glass fibre reinforced plastics Determination of tensile properties Srie arospatiale L
3、uff- und Raumfahrt Matires plastiques renforces au verre textile Dtermination des caractristiques en traction Glasfaserverstrkte Kunststoffe Zugversuch This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatia
4、l). It is published on green paper for the needs of AECMA-Members. It has been technically approvedby the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard the technical content shall not be changed to an extent that int
5、erchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to C
6、EN (European Committee for Standardization) for final vote. 0 aecrna 199 _ AECMA PREN2747 90 M 1012311 0004092 7 M prEN 2747 Page 2 Content s 1 2 3 4 5 6 7 8 9 10 Scope and field of application Eeferences De.f initions Designation of the method Apparatus lest specimens Ccnditioning Procedure Calcula
7、tions and expression of results Test report I AECMA PREN27Li7 90 a LOLZ3LL _ 0004073 7 a I prEW 2747 Page 3 1 Scope and fielcl of application 1.1 This standard specifies a method for the determination of tensile properties of glass fibre reinforced plastic materials. The method is applicable to rein
8、forced thermosetting resins and equally to reiiif orced thermoplastic resins. The results from injection nioulded test specimens fron: glass fibre reinforced therxoplastics are mainly influenced by the orientation of the fibre. This manufacturing method may be used, when other methods for manufactur
9、ing test specimen are not possible. 1.2 This method enables the following tensile properties to be determined : - tensile strength at break, - tensile moduli of elasticity, - elotigat ions. 2 References EW 2374 Aerospace series - Glass bre reinforced mou composites - Production of test panels ings a
10、nd sanciw,:h EN 2489 Aerospace series - Fibre reinforced plastics - Determination of the action of liquid chemicals 1) EN 2743 Aerospace series - Bein.forced plastics - Standard atmospheres for corditioning and testing 2) EN 2823 Aerospace series - Fibre reinforced plastics - Test method for the det
11、ermination of the effect of exposure to humfd atmosphere on physical and mechanical characteristics 2) 3 Definitions 3.1 Tensile stress Tensile load borne by the test specimen throughout the test, per unit initial cross sectional/area of the straight portion of the specimens. 3.2 Elongation Increase
12、 in distance between reference-marks on the straight portion of the test specimen prodiiced by a tensile load and expressed as a percen.tage of the initial distance between the ref erence-marks . 1) Published as AECMA pre-standard at the date of publication of the present standcrd 2) In preparation
13、at the date of publication of the present standard AECMA PREN2q 90 LOL23LL OOOqO7q O 9 psEh 2747 Pc,ge 4 3.3 Modulus of elasticity Quotient of the tensile stress and the corresponding relative deformation in the ultimate maximum strain that a material can bear without deviating from the proportion d
14、eformation-stress, that is the grdient of the relative stress/deformaticn diagram obtained in a tersile test. When the ultimate proportion is exceeded or when it does not exist, it is necessary to distinguish : 3.3.1 Initial tangent modulus Gradient to the tangent at the zero point (see note) of the
15、 relative load /apparent st rain diagram. Note : With certain types of equipment, it may happer. that the diagrams obtained show local irregularities at the outset which must be discounted when. plotting the tangent. There are grounds in this cace when measuring the change in length, for correcting
16、the zero point (see figure 2). 3.3.2 Secant modulus to x 2 elongation Grsdient of the straight line going through the zero point 1) of the stress/deformation diagram and the point in this diagram which corresponds to a relative change in length of x %. 4 Designation of the method Example : In case t
17、he test has been carried out with specimen type I. Description block Identity block Tensile properties EN2747-I Title description Number of the EN standard Type of specimen according to table 1 5 Apparatus 5.1 Test machine with constant tensile speed and comprising : a) A fixed or in practice fixed
18、part, with a suitable grip and a mobile part with a second grip. The grips shall.be designed so as to enable the axis of the test specimens to be aligned at all times with the direction of the applied force. Thh can be achieved, for example, by using centring rods in the jaws of the test: machine, 1
19、) The zero point being taken after possible correction according to the note to clause 3.3.1. b) A load indicating mechanism. It is essential that this mechanism has no inertia at the test speeci and it shall indicate the load to an accuracy of at least 1 % of the value indicated. The fixed and mobi
20、le parts, the device mechanisni and the grips shall be constructed from materials and In sizes such that the total elastic longitudinal deformation of these devices does not exceed 1 Z of the longitudinal deformation sustained at the time of the test compared to the reference length of the test spec
21、imen; these requirements shall be satisfied for any load whatsoever that is less or equal to the fixed capacity of the test machine. 5.2 Extensometer It shall enable determination at any time during the test of the distance between two fixed points (or reference-marks) situated on the straight porti
22、on of the test specimen, Note 1 : Also applicable are mechanical, optical or volumetrical devices, if they measure the elongation of the test specimen to an accuracy of at least 1 %. Note 2 : test specimen not cause failures in the grips. The extensometer used shall not give rise to any damage to th
23、e The initial distance between the - two ref erence-marks, called “gauge length“, shall be known to within an accuracy of 5 1 %. The change in length shall be recorded automatically in relation to the load or the time elapsed since the start of the test, In this latter case, one shall equally record
24、 the load in relation to time. It is essential that the extensometer has no inertia at the test speed. It shall be accurate to within at least 1 X of the elongation measured. The reference length recommended is to be taken from table 1. However, a shorter distance can be used, as long as the above t
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