1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 15 November 2003 prEN 2002-2 Edition P 3 November 2003 Comments should be sent within six months after the date of publication to AECMA-STAN ICs: Descriptors: ENGLISH VERSION Aerospace series Metallic materials Test methods Part
2、2: Tensile testing at elevated temperature Supersedes edition P 2 March 1996 Srie arospatiale Luft- und Raumfahrt Matriaux mtalliques Metallische Werkstoffe Mthodes dessais applicables Prfverfahren Partie 2: Essais de traction temperature leve Teil 2: Zugversuch bei Hochtemperatur This “Aerospace Se
3、ries“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member
4、comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN it
5、 will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdr
6、awing any national standards conflicting with the EN. Metallic Material Domain I I Copyright 2003 O by AECMA-STA1 Page 2 prEN 2002-2: 2003 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Metallic Material Domain. After inquiries and votes carried out in accorda
7、nce with the rules of AECMA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Contents Page O In trod uction . 3 1 Scope 3 2 Normative references . 3 3 Definitions . 3 4 Health and safety 6 5 Principle 6 6 Testing requirements . 6 7 Test report
8、 12 AnnexA(normative) Types of test piece to be used for sheet and strip with thickness less than 8 mm 14 Annex B (normative) Types of non-machined test piece to be used in the case of bar, section and wire with a diameter or thickness less than or equal to 8 mm Annex C (normative) Types of machined
9、 test piece to be used in the case of bar, section, plate and wire with diameter or thickness greater than 8 mm and for forgings and castings . Annex D (normative) Types of test piece to be used in the case of tubes 16 17 20 Page 3 prEN 2002-2: 2003 O Introduction This standard is part of the series
10、 of EN metallic material standards for aerospace applications. The general organization of this series is described in EN 4258. 1 Scope This standard specifies the requirements for the tensile testing of metallic materials at elevated temperature for aerospace applications. It shall be applied when
11、referred to in the EN technical specification or material standard unless otherwise specified on the drawing, order or inspection schedule. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cite
12、d at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of the publications apply to this European Standard only when incorporated in it by amendments or revision. For undated references the latest edition
13、of the publications referred to apply. EN IS0 7500-1 EN IS0 9513 EN 4258 EN 4259 EN 10002-4 EN 60584-2 ASTM E-I012 Metallic materials - Verification of static uniaxial testing machines - Part I: Tension/ compression testing machines - Verification and calibration of the force measuring system Metall
14、ic materials - Calibration of extensometers used in uniaxial testing Aerospace series - Metallic materials - General organization of standardization - Links between fypes of EN standards and their use Aerospace series - Metallic materials - Definitions of general terms 1 ) Metallic materials - Tensi
15、le test - Part 4: Verification of extensometers used in uniaxial testing Thermocouples - Part 2: Tolerances Standard practice for verification of specimen alignment under tensile loading 2) 3 Defini ti ons For the purposes of this standard, the following definitions apply: 3.1 General terms See EN 4
16、259. 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA Page 4 prEN 2002-2: 2003 3.2 Other terms Other terms are given in Table 1 Table 1 - Defi
17、nitions - Other terms Symbol Unit Term Definition Test piece The portion of the test sample on which the tensile test is carried out. Proportional test pieces A test piece with an original gauge length (Lo) having a specified relationship to the square root of the cross- sectional area (.So). The pr
18、oportionality coefficient, K, has the internationally recognised value of 5,65 for test pieces of circular cross-section. The gauge length of a proportional test piece is therefore equal to 5,65 - Lengths at least equal to that of the grips and may project beyond the grips for a maximum length equal
19、 to the external diameter of the tube; - A shape that shall have no effect on the deformation of the gauge length. Page 7 prEN 2002-2: 2003 e I o00 OC 6.1.1.4 Heating device The heating device for the test piece: - shall be such that the test piece can be heated to the specified temperature (O); - s
20、hall be able to maintain an indicated test temperature (Oi), which at any time throughout the duration of the test and at any point within the gauge length, shall not deviate from the specified temperature (O) by more than the values shown in Table 2; +3“C +4“C +5“C +I% Table 2 - Tolerances on test
21、temperature Test temperature I Tolerance The permitted deviation in temperature along the original gauge length (io) shall comply with the above at least until the point corresponding to the proof stress of non-proportional elongation is reached. The heating characteristics of the furnace and temper
22、ature control system shall prevent the limits specified above being exceeded during the heating of the test piece. 6.1 .I .5 Temperature measurements Platinum/platinum-rhodium thermocouples of type R or type S to Class 1 according to EN 60584-2 shall be used. They shall be verified over the working
23、temperature range by a method traceable to the international unit (SI) of temperature, at intervals not exceeding one year. 6.1.1.6 Recording A recordeddata logger, accurate to + 1 ,O “C and with a resolution of 0,5 OC, shall be verified at intervals not exceeding 12 months. Verification shall be pe
24、rformed using a thermocouple measuring/simulating instrument, accurate to + 0,5 “C and with a resolution of 0,2 OC, it self verified at intervals not exceeding 12 months. Verification errors shall be recorded in a report. 6.1.2 MateriaWeagents Materialdreagents may include suitable: - degreasing flu
25、ids; - recording paper; - means of electronic recording, if appropriate; - marking inks. - refractory materials 6.1.3 Qualification of personnel Testing to the requirements of this test method shall only be undertaken and/or supervised by personnel who have demonstrated their competence by a suitabl
26、e education or appropriate training and experience. Such competence shall be documented in an appropriate form. Page 8 prEN 2002-2: 2003 Sheet and strip 8 mm and for forgings and castings Tu be Type of product I Corresponding annex C D 6.2.3 Preparation of test pieces Machining, if required, shall b
27、e carried out at ambient temperature in accordance with a machining procedure. Precautions shall be taken to minimize superficial cold working, appreciable heating of the part or surface irregularities that could affect the results of the test. The surface finish of the parallel length shall have a
28、Ra value not exceeding 0,8 pm. The parallel length shall be free of any visible scratches, especially circumferential marks. In the case of material with an elongation specified in the material standard to be less than 10 %, tensile test pieces of other than circular cross-section shall have the edg
29、es along the parallel length and the transition radii slightly rounded and lengthwise polished. The reduction of the cross-sectional area by this treatment shall be negligible. The test piece shall be protected from damage or contamination until the start of the test. 6.3 Testing procedu re 6.3.1 6.
30、3.1 .I The original cross-sectional area shall be calculated from measurement of the appropriate dimensions, with an accuracy of 0,2 % or 0,005 mm, whichever the greater value, for each dimension. In the case of a length of tube, the original cross-sectional area (So) shall be calculated as follows:
31、 Determination of the cross-sectional area. Determination of the original cross-sectional area (So) So = na (D -a) Page 9 prEN 2002-2: 2003 When using test piece consisting of a longitudinal strip cut from a tube, the original cross-sectional area shall be calculated according to one of the followin
32、g equations: 6 D (D -2 a) b 0,17 d r rl Page 20 prEN 2002-2: 2003 Annex D (norm a tive) Types of test piece to be used in the case of tubes D.l Shape of the test piece The test piece consists either of a length of tube or a longitudinal strip cut from the tube and having the full thickness of the wa
33、ll of the tube, or of a test piece of circular-cross-section machined from the wall of the tube. (See Figures D.l and D.2) D.2 Dimensions and tolerances of the test piece Machined longitudinal test pieces are described in: a) Annex A for tube of wall thickness less than or equal to 8 mm; b) Annex C
34、for tube of wall thickness greater than 8 mm. A test piece consisting of a length of tube shall conform to annex B. Where a tube is fitted with plugs to assist gripping, the free length between a plug and the closest gauge mark shall be greater than D/4. Figure D.l -Test pieces comprising a length of tube before and after fracture Figure D.2 - Example for test piece cut from a tube before and after fracture
