1、STD.AECMA PREN b74-ENGL L798 LL23LL 0L5b57 055 AECMA STANDARD NORME AECMA AECMA NORM prEN 6074 Edition P 1 November 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 8-1200 BRUXELLES - Tel. +32) 2 775 81 10 Fax. (+32) 2 775 81 11 ICs: Descriptors: ENGLISH VERSI
2、ON Aerospace series Metallic materials Test methods Statistical data for material qualification Srie arospatiale Matriaux mtalliques Mthodes dessai Donnes statistiques pour la qualification des matriaux Luft- und Raumfahrt Metallische Werkstoffe Prfverfahren Statistische Daten fr Werkstoff Qualifika
3、tionen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee follo
4、wing comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, ph ysically or functionally, without re-identification of the standard. After examination and signature of the AECMA S
5、tandard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. I Nota - Extra copies can be supplied by B.N.A.E. - Technopoiis 54 - 199, rue Jean-Ja
6、cques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Edition approved for publication 1998-1 1-30 AIBITFG Chairman Comments should be sent within six months after the date of oublication to AECMA Gulledelle 94 8-1 200 BRUXELLES Mr W. Lampa aecma 1998 Contents list 1 Scope 2 Normative references 3 Defin
7、itions, symbols and abbreviations 4 Principle of the method 5 Statistical processing tools 6 Procedure 7 8 Test report Annex A (normative): Presentation of initial data Annex B (normative): Presentation in graphical form Annex C (normative): Presentation of statistical analysis results Evaluation an
8、d presentation of results STD-AECMA PREN 6074-ENGL 1778 D LUL2311 00LSb57 728 D Page 3 prEN 6074: 1998 1 Scope This standard defines the procedure to be followed in order to give purchaser, statistical manufacturing data, that contributes to manufacturer qualification to the relevant material standa
9、rd and the continuation of this qualification. This standard is suitable for any type of data resulting from previous production acceptance tests of the product from the manufacturer to be qualified. This statistical evaluation is a part of the technical qualification. 2 Normative references This Eu
10、ropean Standard incorporates by dated or undated reference provisions from other publications. These normative references are at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications appl
11、y to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 3534 Statistics-Vocabulary and symbols MIL-HDBK 5 G Metallic-Materials and Elements for Aerospace Vehicle Structures 1) 3 Definitio
12、ns, symbols and abbreviations For the purposes of this standard the following definitions apply: 3.1 Material characteristics and symbols R, = Tensile strength R0,* = A % = Elongation in percent K, = Fracture toughness K, = Impact energy y = Electrical conductivity Tensile yield stress at which perm
13、anent strain equals 0,2 % 3.2 Statistical definitions and symbols See IS0 3534 A value: B value: Value of the variable (V) taken into account (Rm, A%, .), such that the probability P (V Value A) 99% guaranteed with 95% confidence. Value of the variable (V) taken into account (Rm, A%, .), such that t
14、he probability P (V Value A) 90% guaranteed with 95% confidence. 3.3 Abbreviations SPC: Statistic Process Control FMECA: Failure Mode Effects and Criticality Analysis I) Published by: Department of Defense (DoD), the Pentagon, Washington D.C., 20301, USA Page 4 prEN 6074: 1998 4 Principle of the met
15、hod See figure i. Sampling I t Graphic representations and calculations on initial data: in histogram form in time base form calculations of mean values and standard deviation Normal rule or skewed normal rule Weibull rule or other A See MIL HDBK5 Chapter 9 or X2 - I Calculations of A and B values o
16、f the population t Yes a Statistical ) qualification is agreed Statistical qualification s suspended B If delivery is required, individual values given purchaser value for acceptation tests. acceptance tests by the purchaser. To propose corrective (or remedial) actions. * FoIIow-uP I Calculations of
17、 A and B values of the population f Yes u Statistical n qualification is agreed Figure 1 : Principle of Statistical qualification for each characteristic, thickness, range, direction of the relevant product STD-AECMA PREN b07Li-ENGL 1778 = 1012311 0015bb1 58b M Page 5 prEN 6074: 1998 5 Statistical p
18、rocessing tools The statistic processing may be carried out with a software system available on the market or a software system developed in house. 6 Procedure The procedure consists in: - defining the data sampling to be dealt with, - testing the statistical method named in the present standard, wh
19、ich is the most suitable for the data sampling to be dealt with, - comparing the results of the statistical analysis with the requirements in order to pass qualification tests, - proposing a protocol of corrective and curative actions, when the tests show negative results. See figure 1. 6.1 Sampling
20、 6.1.1 Evaluation statement There are three types of statistical evaluation Type I - The material is not new for the manufacturer but it is qualified according to a specification other than an EN (Material Standard). In this case, the data package may be used for constitution of the technical file r
21、equested for technical qualification. Type II - The material is a new material for the manufacturer, who makes another similar material using the same process. In the case where the lower limits for A and B values are not supplied through the literature, the supplier shall give its own initial speci
22、fications based on available data. Type III - The material is a new material for the manufacturer and for the purchaser. Statistical A and B values do not exist yet. For each type of statistical evaluation, the purchaser and the manufacturer shall agree on the initial data package to be analysed in
23、accordance with the following principle, and on an initial material specification see table 1. Table 1 Type of sampling to be analysed statistically Qualification requirements Release data of the previous production of the material to be qualified. EN standard values plus the rule used for their cal
24、culation. Release data of the previous production of the most similar material to the materiat to be qualified. EN standard values plus the rule used for their calculation. Release data of the previous production of the most similar material to the material to be qualified. EN standard values plus t
25、he rule used for their calculation. STD-AECMA PREN b074-ENGL Page 6 prEN 6074: 1998 6.1.2 Definition of statistical sampling - The samplings to be statistically processed are those which are related to all the release tests (also those not successful), for instance as a min. R, R, A% in Long and Tra
26、nsverse directions, and, if possible K, 7, O Standard deviation O : -1 value for 25 % I% : l I I 2 1. n Dates Frequency Variable Unit STD.AECMA PREN b07i.I-ENGL 1798 D 1012311 OOLSbbb Obi! D Page 10 prEN 6074: 1998 Name Annex C (normative) Presentation of statistical analysis results Value Variable I F x100 % x75 % x50 % x25 % xo Yo Unit - Mean value I Rule Normale Weibull Other Standard deviation 1-1 Test Name Name Values Value Value Test I O Name Value Value -I-
