1、-STD*AECMA PREN 2002-b-ENGL 2000 1012311 001744B Ob5 Edition approved for publication 2000-01-31 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-1200 BRUXELLES prEN 2002-6 Edition P 2 January 2000 PUBLISHED BY THE
2、 EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 i75 8110 - Fax. (+32) 2 775 8111 Supersedes issue P 1 January 1987 ICs: Descriptors: ENGLISH VERSION Srie arospatiale Matriaux mtalliques Mthodes dessais Partie 6: Essai de pliage Aerospace series M
3、etallic materials Test methods Part 6: Bend testing Luft- und Raumfahrt Metallische Werkstoffe Prfverfah ren Teil 6: Biegeversuch This Yierospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper
4、 for the needs of AECMA- Members. It has been technically approved by the experts of the concerned Technical Commitee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that inferchangeability is affec
5、ted, 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 if will be submitted as a draft European Standard to CEN (European Committee f
6、or Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C5 Chairman Mr Evetts Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with
7、AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Con tents O 1 Scope . 2 Normative references . . 3 Definitions 4 Health and safety 5 Principle . . . . . 6 Testing requirements . . 7 Test re port . . . . . . ,. .,. . . _,. , ._ ,.,., , .,. , .,. . . . _. ._ ._
8、Annex A (normative) Bending devices . . .,. Annex B (normative) Test pieces . ._ 50 mm, it shall be reduced to 25 mm minimum (see Annex B - Figure Bl). In this case the unmachined side shall be on the tension side during the bending test. Copyright Association Europeene des Constructeurs de Materiel
9、 Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN tOU2-b-ENLL 2000 M 1012311, OU17453 Y22 Page 6 prEN 2002-6: 2000 6.2.2.3 Forgings and castings Test piece shape and dimensions shall be agreed betwee
10、n the manufacturer or supplier and purchaser or user. 6.2.2.4 Test piece length The length of the test piece shall be suitable for its thickness and for the test equipment used. 6.2.2.5 Test piece preparation The longer edges of test pieces shall be rounded and smoothed longitudinally such that ther
11、e are no transverse burrs, scratches or marks which may adversely influence the test. The use of a shearing machine or flame cutting affects the structure of the metal along the cut edge. Metal thus affected shall be removed from such damaged edges by longitudinal milling, planing, grinding or other
12、 method which does not use large forces or overheat the material. 6.3 Testing procedure 6.3.1 Temperature of test The test shall be carried out at 10 “C I 8s 35 “C, unless otherwise specified. In case of dispute, the test shall be performed at O= 23 “C f 5 “C. 6.3.2 Method of test 6.3.2.1 The test p
13、iece shall be placed on the supports (Annex A - Figure AI), V-block (Annex A - Figure A2), block of soft material (Annex A - Figure A3) or in a clamp (Annex A - Figure A4) and bend in the middle between the supports by the action of a continuously acting force. The bending force shall be applied slo
14、wly to permit free plastic flow of the material. A specified angle of bend shall normally be regarded as a minimum. A specified internal radius of bend shall normally be regarded as a maximum. Bending to a specified angle or internal bend radius 6.3.2.2 Bending to parallelism The test piece may firs
15、t be bent as stated in 6.3.2.1 or by bending around a mandrel (Annex A - Figure A4) and then placed between the parallel plates of a press (Annex C - Figure Cl). A continually increasing force shall then be applied to obtain parallelism with or without an insert (Annex C - Figure C2). The thickness
16、of the insert shall be stated in the technical or material standard or be agreed between the manufacturer or supplier and purchaser or user. 6.3.3.3 Bending to contact The test piece, bent as stated in 6.3.2.2, may be further bent to obtain direct contact (Annex C - Figure C3). 6.3.3.4 Reverse bendi
17、ng The test piece shall be bent in a device shown in Annex A (Figure A5). The number of reverse bends shall be counted as shown in Annex A (Figure A6). To ensure continual contact between the test piece and the supports during the test, some form of constraint is applied. This may be tension along t
18、he longer axis or by rollers or guides. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD*AECMA PREN 2002-L-ENGL 2000 LO1231l OU17454 3b9 Page 7 prEN
19、 2002-6: 2000 6.4 Expression of results 6.4.1 Acceptance criteria Test pieces bent to the angle or internal bend radius specified in the technical or material standard, drawing or order shall exhibit no visible cracks at a nominal 10 times magnification. Acceptance criteria may be otherwise specifie
20、d by agreement between the manufacturer or supplier and purchaser or user. 6.4.2 Non-compliance with acceptance criteria Reference shall be made to the relevant technical standard, drawing or order. Otherwise the purchaser or user and manufacturer or supplier shall agree on the action to be taken. 7
21、 Test report All results shall be in written form and the test report shall include, when relevant, at least the following information: - reference to this test method; - any other information relevant to the test method(s), (e.g. test condition, test equipment, test procedure, verification, .); - i
22、dentification and traceability of the semi-finished product to be tested in accordance with the technical specification; - identification and traceability of test samples taken from the semi-finished product (e.g. location, orientation, size): - identification and traceability of test pieces taken f
23、rom test samples (e.g. number, preparation, method, condition); In certain cases the test piece may be the test sample: - expression of results (e.9. individual values or mean values, units, .): - recorded plotdgraphs, when necessary; - date of test; - traceability to individual performing the test
24、work; - any incident which may have affected the results; - any deviation from the test method standard. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-
25、,-STDDAECMA PKEN 2002-b-ENGL 2000 1012311 0037455 2T5 I Page 8 prEN 2002-6: 2000 Annex A (normative) Bending devices All dimensions in mm Method 1 I Mandrel Method 2 a = Thickness of test piece (or diameter of a round test piece, or diameter of inscribed circle of a polygonal test piece) D = Diamete
26、r of mandrel L = Length of test piece I = Distance between supports (D + 3a) f 1/2a a = Angleofbend R = Radius of supports (2a I R I 1 Oa) Figure AI - Bending device with two supports and mandrel Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license
27、with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- Page 9 prEN 2002-6: 2000 STD-AECMA PREN 2002-b-ENGL 2000 B LOL2311 001745b 131 U All dimensions in mm a = Thickness of test piece (or diameter of a round test piece, or diameter of inscribed circle of a pol
28、ygonal test piece) D = Diameter of mandrel a = Angleofbend a= D= a= Figure A2 - Bending device with a V-block and mandrel Thickness of test piece (or diameter of a round test piece, or diameter of inscribed circle of a polygonal test piece) Diameter of mandrel Angle of bend Figure A3 - Bending using
29、 a block of soft material Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- STD-AECHA PREN ZOU2-b-ENGL 2000 E 10L231B OCIL7957 078 .II Page 10 prEN 2002
30、-6: 2000 All dimensions in mrn Packing i Elevation Mandrel I Test piece Vice _ Roller TE-(- _- Plan a = Thickness of test piece (or diameter of a round test piece, or diameter of inscribed circle of a polygonal test piece) D = Diameter of mandrel a = Angleofbend Figure A4 - Bending device with a cla
31、mp and a mandrel Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-All dimensions in mm Tension Method 1 Method 2 Method 3 a = Thickness of test piece (o
32、r diameter of round test piece or diameter of inscribed circle of a polygonal test piece) h 5 5a except for very thin sections Figure A5 - Reverse bending device Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reprodu
33、ction or networking permitted without license from IHS-,-,-STD=AECMA PREN 2002-b-ENGL 2OO W LOL23LL OUL7959 940 S Page 12 prEN 2002-6: 2000 Figure A6 - Method of counting reverse bends Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMAN
34、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Annex B (norm at ive) Test pieces I In N t,/ Figure BI - Test pieces when diameter or inscribed circle diameter exceeds 50 mm Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS un
35、der license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD=AECMI- PREN 2002-b-ENGL 280U H 1OL231L C!Cl17YLL 5T9 Page 14 prEN 2002-6: 2000 Annex C (normative) Method of test Figure CI - Bending to parallelism - Starting position (1- insert Figure C2 - Bending to parallelism - Finishing position Figure C3 - Bending to contact Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
