1、1 _ - - _- CEN *PREN*lb75 92 H 3404589 0025836 O W - Edition approved for publication 1992-04-30 A.E.C. M .A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM Conirnentc should be cent.wvithrn six months C7 Chairman after the date of publication decision A E.C.M A. Teclinotiolis - 175, rue Jean-Jacques Rou
2、sseau 921 38 Issf-lec-Mouliiieaux Cdex - FRANCE M. BEZAUD . prEN 3675 Issue P 1 April 1992 EDIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIELAEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex - Tl. (1) 47.36.98.76 UDC : Key words : ENGLISH VERSION A
3、erospace series Sampling plan for acceptance testing of aramid, carbon fibre and textile glass filament yarns Srie arospatiale Luft- und Raumfahrt Plan dchantillonnage pour le contrle de rception des fils continus daramide, de carbone et de verre textile Prfplan fr die Abnahmeprfung von Aramid-, Koh
4、lenstoff- und Textilglas- filamentgarnen This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). it is published on green paper for the needs of AECMA-Members. It has been technically approved by the expe
5、rts of the concerned Commission following comment by the Member countries. Subsequent to the publication of tfiis pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After ex
6、amination 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 :o CEN (European Committee for Standardization) for final vote. (Q aecrna $392 CEN *PREN*3La75 92 3404583 002.581
7、7 2 aS prEN 3675 Page 2 Contents 4 2 References 3 Acceptance sampling plan Scope and field of application - - -.-= c- CE“ *PREN*3675 72 W 340Y587 00258L8 Y y- prEN 3675 Page 3 Sample cite (Spools) 1 Scope and field of application Vsuatiy detectable nonconorrnities (Spoolsf AQL S,5 This standard spec
8、ifies the sampling plan for acceptance testing of aramid, carbon fibre and textile glass filament yarns in terms of sample size and rejection criteria. ch ara ct,e ris t ics (Spool values) This standard serves as a basis for the corresponding Technical Specification. It covers the inspection by attr
9、ibutes. The inspection by measurements (variables) will be added in a subsequent edition. It is also planned to extend its scope of application to reinforcing woven fabrics. Sample size (Spools) 2 References 8 13 20 IS0 1886 Reinforcement fibres - Sampling pians applicable to received batches O 1 1
10、lSO2859-1 Sampling procedures for inspection by attributes - Pat 1 : Sampling plans indexed by acceptable quality levei (AQL) for lot-by-lot inspection IS0 3951 Sampling pfocedures and charts for inspection by variables for percent nonconforming Aerospace series - Carbon fibre filament yarn - Techni
11、caf specification 1) EN 2962 3 Acceptance camplin9 plan 3.1 Sampling Sampling shall be carried out in accordance with the sampling plan shown in table 1, The testing procedures and the evaluation of results shall be specified in the relevant test standard. The plan shown represents a sampling plan f
12、or reciuced inspection by attributes in accordance with IS0 2859-1 (table Il-C) and is applicable to acceptance testing under normal conditions. Special quality situations or particular quaiity requirements necessitate tke application of sampling pians for normal (table 3) or tightened inspection by
13、 attributes in accordance with IS0 2859-1 or also for inspection by variables in accordance with IS0 3951. Table 1 - Sampling plan for reduced inspection in accordance with IS0 2859-5, table Il-C - Delivery batch size (spooisl N 2 to 25 26 to 50 51 to 90 91 to 150 151 to 280 281 to 500 501 to 1 200
14、1201 to 3 200 3201 to 10 O00 i d 2, I I 2 2 3 4 5 6 8, c l - O O o O O 1 1 2 3 61 : l) c = acceptance number 2, d = rejection number i) In preparation at the date of publication of the present standard. f. I. . CEN %!PRENu3b?5 92 iEi 3404589 0025dL9 b UM prEN 3675 Page 4 3,2 Evaluation 3.2.1 The num
15、ber of nonconforming spoofs in sample nl is compared to the acceptance and rejection numbers, c and d respectively, specified for visual nonconformities. The evaluation shall be as specified in,table 2. - Inspection of visually detectable nonconformities 3,2,2 Measurable product characteristics The
16、following applies to each characteristic : The mean value Zof all spool values in sample nl shall conform to the requirements specified for the mean value of the delivery batch in the relevant material standard. The number of spool values in sample nl not conforming to the requirements specified in
17、the relevant material standard is compared to the acceptance and rejection numbers, c and d respectively, specified for measurable product characteristics. The evaluation shall be as specified in table 2. The individual value represents the arithmetic mean of all individual measurements carried out
18、on one elementary unit. The individual values determined in this way for each elementary unit will then be used for the decision. Table 2 - Acceptance criteria Number of nonconforming units in the samples less than or equal to c larger than or equal to d larger than c and less than d Decision Consig
19、nment accepted Consignment rejected Consignment accepted, but switching over to normal inspection in accordance with IS0 2859-1 for the following consignment (table 3) CEN *PREN*Ib95 e12 E 3404589 0025820 2 H : - Delivery batch size (Spools) N 2 to 8 9 to 15 16 to 25 26 to 50 51 to 9c 91 to 15c 151
20、to 28C 281 to 50C 501 to 1 20c I1201 to 3 20c 3201 to 10 OOC Table 3 - Sampling plan for normal inspection Sample size ( s p o o I s 1 nl 2 3 5 8 13 20 32 50 80 125 200 Visual nonconfoimities (Spoolsl AQL 2,5 . - c ” O O O O 1 1 2 3 5 7 10 d 2, 1 1 1 1 2 2 3 4 6 8 11 Measurable product characteristi
21、cs (Spool values) AB c 1 O O O o O 1 1 2 3 5 7 1,5 d 2 1 1 1 1 1 2 2 3 4 6 prEN 3675 Page 5 -aminate inspection Sample size (spools) n2 2 2 2 4 I c = acceptance number 2, d =rejection number 3.3 When normal inspection is being carried out, reduced inspection to table 1 may be only reverted to provid
22、ed 3 consecutive batches at least equal in size to the one previously rejected) submitted to normai inspection have been accepted. 3.4 Laminate inspection For each measured characteristic, the mean value Fand II individual measurements in sample n2 shall conform to the requirements specified in the
23、relevant material standard, That means for laminate inspection the .individual measurement also gives the individual value to be used according to tables 1, 2 and 3. 3.5 Test report The test report shall include the following information : - Reference to the present standard, - Complete identificati
24、on of the product tested, - Number of delivery or production batch or date, - A survey of the tests and inspection performed, the test methods applied and the results obtained (table 41, - A definite statement on acceptance or rejection of the batch submitted and tested, - Details on change of inspe
25、ction severity, if any. - CEN *PREN*K3b75 92 W 3YOY589 0025121 Y prEN 3675 Page 6 Table 4. Inspection and test results Mean value X Conforming to material stan- dard require- ments 1) 110 Spools/Spool values Total Conforming to material number standard requirements no inspection batch Conforming to
26、standard requirements b 5, Material designation Visual examination Measurable product cha- racteristics - to standard., . - to standard . - to standard., . - to standard . - to standard. La mi na te inspections - to standard . - to standard. - to standard . no l) 2, 3, Actual value to be entered in appropriate column. Number of spools or individual measurements to be entered in appropriate column. Mark by sign x in the appropriate column 4, a = without reservation 5, b = switch to normal inspection
