【正文】 cate test pieces shall be taken from each specimen and submitted to the test。, as applicable, around a pin having a radius equal to k times the thickness t of the sheet, strip or plate (. 2,5 t) without cracking. Remended values of the minimum bend radii for different alloys, tempers and thicknesses are given in Tables 2 to 39. Compliance with these values and/or conduct of the test is only required when so specified on the order. The test shall be carried out in accordance with EN ISO 7438, particular attention being paid to the following: ? bend test shall be carried out on a specimen taken adjacent to the tensile test specimen。 ? elongation for rectangular (or square) testpieces shall be measured using an original gauge length of 50 mm。 ? for specified thicknesses from 10,0 mm up to and including 12,5 mm a round testpiece or a rectangular test piece may be used。 R NOR M UNG Management Centre: rue de Stassart, 36 B1050 Brussels 169。nder, Bleche und Platten Teil 2: Mechanische Eigenschaften This European Standard was approved by CEN on 24 March 2020. CEN members are bound to ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up todate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T 201。les 233。ENNE EUROP196。Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Nov 14 09:45:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 國內(nèi)外標(biāo)準(zhǔn) 大全 網(wǎng) 國內(nèi)外標(biāo)準(zhǔn) 下載地址 BRITISH STANDARD BS EN 4852:2020 Aluminium and aluminium alloys — Sheet, strip and plate — Part 2: Mechanical properties The European Standard EN 4852:2020 has the status of a British Standard ICS BS EN 4852:2020 Amd. No. Date Comments Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Nov 14 09:45:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI National foreword This British Standard is the official English language version of EN 4852:2020. It supersedes BS EN 4852:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee NFE/35, Light metals and their alloys, to Submittee NFE/35/5, Wrought aluminium and aluminium alloys, which has the responsibility to: — aid enquirers to understand the text。 BSI 14 July 2020 ISBN 0 580 44060 5 Summary of pages This docum ent prises a front cover, an inside front cover, the EN title page, pages 2 to 49 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Nov 14 09:45:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROP201。les, bandes et t244。caniques Aluminium und Aluminiumlegierungen B228。 I S C H ES KOM I TEE F 220。 ? for specified thicknesses up to and including 12,5 mm the testpiece shall have a rectangular (or square) crosssection. Its reduced section shall be 12,5 mm wide and its thickness equal to the full thickness of the product。 ? during a test to determine proof stress, the rate of stress application shall not exceed 12 MPa/s. After removal of the extensometer the rate of straining may be increased but it shall not exceed 50 % of the length of the reduced section per minute。 or 180176。 ? edges of the testpiece may be machined when practical. They may be rounded to a radius of approximately 2 mm. 5 Hardness test Hardness test can be a convenient means for checking the homogeneity of a lot 。 ? no stresscorrosion related rupture shall be observed after a minimum exposure time of 20 days. The method of stressing (bending, uniaxial loading, Cring, etc.), the shape and dimensions of the testpieces and the frequency of the test are left to the discretion of the producer, who shall maintain records of all lots so tested and make them available for examination at the producer39。 ? revealed microstructure shall be predominantly free of a continuous grain boundary work of aluminium magnesium precipitate (Al3Mg2). Acceptability shall be determined by parison to producerestablished reference photomicrographs of acceptable material. If the microstructure shows evidence of Al3Mg2 precipitates