Contents DIN 50125:

Transcription

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2 Contents Foreword Scope Normative references Terms and definitions Types, dimensions, and designation General Type A test pieces Type B test pieces Type C test pieces Type D test pieces Type E test pieces Type F test pieces Type G test pieces Type H test pieces Marking Bibliography Page 2

3 Foreword This standard has been prepared by Working Committee NA AA Zug- und Duktilitätsprüfung für Metalle of the Normenausschuss Materialprüfung (Materials Testing Standards Committee). DIN EN ISO lays down general specifications regarding tensile test piece shapes. More detailed examples of tensile test piece shapes may be given in product standards. For this reason Working Committee NA AA felt it was important that DIN (which applies to tensile test piece shapes in Germany) remains valid to facilitate the manufacturing of such test pieces in the factory or workshop. This edition of the standard specifies examples of tensile test piece shapes which meet the overall conditions specified in DIN EN ISO Amendments The following amendments have been made to DIN 50125: : a) Tolerances on dimensions and shape have been harmonized with DIN EN ISO b) Symbols have been harmonized with DIN EN ISO c) The transition radius, parallel length, and total length of test pieces have been harmonized with DIN EN ISO Previous editions DIN DVM 125 = DIN 50125: , , , , DIN Corrigendum 1:

4 1 Scope This standard lays down specifications for test pieces which can be used for tensile testing metallic materials in accordance with DIN EN ISO The standard serves to facilitate the manufacture of tensile test pieces in the factory or workshop. NOTE The tensile test pieces specified here are examples of test pieces which meet the standard conditions laid down in DIN EN ISO Test pieces which deviate from the examples given here, but which meet the requirements of DIN EN ISO , are also deemed to be in compliance with this standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN EN ISO , Metallic materials Tensile testing Part 1: Method of test at room temperature 3 Terms and definitions For the purposes of this standard the terms and definitions in DIN EN ISO apply. 4 Types, dimensions, and designation 4.1 General The tolerances specified in Table 1 shall apply to test pieces as specified in 4.2 to 4.6 and

5 Table 1 Tolerances on dimension and shape relating to the transverse dimensions of test pieces Dimensions in millimetres Designation Test piece width Nominal transverse dimension Tolerance a Tolerance on shape b Diameter of machined test pieces of circular cross-section (types A, B, C, D) and transverse dimensions of test pieces of rectangular crosssection machined on all four sides (type E) 3 6 > 6 10 > > ,02 0,03 0,03 0,04 0,05 0,04 0,10 0, ,02 0,03 Transverse dimensions of test pieces of rectangular crosssection machined on only two opposite sides > 6 10 > > ,03 0,04 0,05 0,06 0,10 0,12 > ,15 0,15 Dimensions of test pieces taken from flat products (type H) 12,5 0,05 0, ,10 0,12 a b These tolerances are applicable if the nominal value of the original cross-sectional area S o is to be included in the calculation without having to measure it. If these machining tolerances are not complied with, it is essential to measure every individual test piece. Maximum deviation between the measurements of a specified transverse dimension along the entire parallel length L c of the test piece. 5

6 4.2 Type A test pieces Key d o test piece diameter L o original gauge length (L o = 5 d o ) d 1 diameter of gripped ends ( 1,2 d o ) L c parallel length (L c L o + d o ) h length of gripped ends L t total length of test piece Figure 1 Type A test piece, of circular cross-section, with smooth, cylindrical ends for clamping in wedge grips Designation of a type A test piece with a diameter d o = 12 mm and original gauge length L o = 60 mm: Tensile test piece DIN A Table 2 Examples of dimensions for type A test pieces Dimensions in millimetres d o L o d 1 r h L c L t min. min. min. min

7 4.3 Type B test pieces Key d o test piece diameter L o original gauge length (L o = 5 d o ) d 1 diameter of ISO metric thread L c parallel length (L c L o + d o ) h length of gripped ends L t total length of test piece Figure 2 Type B test piece, of circular cross section, with threaded ends Designation of a type B test piece with a diameter d o = 14 mm and original gauge length L o = 70 mm: Tensile test piece DIN B Table 3 Examples of dimensions for type B test pieces Dimensions in millimetres d o L o d 1 r h L c L t min. min. min. min M M M M M M M M M M M

8 4.4 Type C test pieces Key d o test piece diameter h length of gripped ends ( d o + 5 mm) d 1 diameter of gripped ends ( 1,75 d o ) L o original gauge length (L o = 5 d o ) d 2 diameter of shoulder ( 1,2 d o ) L c parallel length (L c L o + d o ) g length of shoulder ( d o ) L t total length of test piece Figure 3 Type C test piece, of circular cross section, with shoulder ends Designation of a type C test piece with a diameter d o = 16 mm and original gauge length L o = 80 mm: Tensile test piece DIN C Table 4 Examples of dimensions for type C test pieces Dimensions in millimetres d o L o d 1 d 2 r g h L c L t min. min. min. min. min

9 4.5 Type D test pieces Key d o test piece diameter L o original gauge length (L o = 5 d o ) d 1 diameter of shoulder ( 2 d o + 8 mm) L c parallel length (L c L o + d o ) h length of gripped ends L t total length of test piece a Ends may be extended, provided the specified diameter d 1 is maintained. Figure 4 Type D test piece, of circular cross section, with conical ends Designation of a type D test piece with a diameter d o = 12 mm and original gauge length L o = 60 mm: Tensile test piece DIN D Table 5 Examples of dimensions for type D test pieces Dimensions in millimetres d o L o d 1 r h L c L t min. min. min

10 4.6 Type E test pieces Key o test piece thickness L o original gauge length (L o = 5,65 o b o ) b o test piece width L c parallel length (L c L o + 1,5 o b o ) B width of gripped ends ( 1,2 b + 3 mm) L t total length of test piece h length of gripped ends ( 2 b + 10 mm) Figure 5 Type E test piece, flat bar with ends for clamping in wedge grips Designation of a type E test piece with a thickness o = 5 mm, width b o = 16 mm and original gauge length L o = 50 mm: Tensile test piece DIN E Table 6 Examples of dimensions for type E test pieces Dimensions in millimetres o b o L o B r h L c L t min. min. min. min. min

11 NOTE 1 Flat test pieces are usually to be taken from strip, sheet, bars and sections. The edges should be deburred. If the rolling skin is not machined off, the test piece thickness o is equal to the product thickness. NOTE 2 Where flat test pieces are machined on all surfaces, the specified surface roughness applies for all surfaces, with the exception of the test piece ends. 4.7 Type F test pieces Unmachined sections of round bars Designation of a type F test piece with a diameter d o = 10 mm and original gauge length L o = 50 mm: Tensile test piece DIN F Table 7 Examples of dimensions for type F test pieces Dimensions in millimetres Test piece diameter Original gauge length Total length of test piece d o L o L t min

12 4.8 Type G test pieces Unmachined sections of flat bars and sections Designation of a type G test piece with an original cross-sectional area S o = 314 mm 2 and original gauge length L o = 100 mm: Tensile test piece DIN G Table 8 Examples of dimensions for type G test pieces Original cross-sectional area Original gauge length Total length of test piece S o mm 2 L o L t min

13 4.9 Type H test pieces Flats taken from flat products having a thickness between 0,1 mm and 3 mm: sheet, strip and flat rolled products, non-proportional test pieces Key o b o B h test piece thickness (= product thickness) test piece width width of gripped ends length of gripped ends L o L c L t original gauge length parallel length (L c = L o + 2 b) total length of test piece Figure 6 Type H test piece, flat bar with ends for clamping in wedge grips Designation of a type H test piece with a width b o = 20 mm and original gauge length L o = 80 mm: Tensile test piece DIN H Table 9 Examples of dimensions for type H test pieces b o L o B r h L c L t 1 min. min. 12, NOTE 1 Flat test pieces are usually to be taken from strip and sheet. The edges should be deburred. Where possible, the rolling skin should not be machined off. NOTE 2 Manufacturing test pieces by punching may result in significant changes in the material characteristics, particularly the proof stress (due to strain hardening). For materials which are known to strain-harden, test pieces should be prepared by milling, grinding, etc. 5 Marking Tensile test pieces shall be marked in such a way that, after testing, it is still possible to determine from which sample the test pieces were taken, as well as their location and direction in the sample, where necessary. The marking shall be applied to the face or side of one end, or to both ends, where necessary. 13

14 Bibliography DIN 50148, Tensile test pieces for non-ferrous metals pressure die castings DIN 50154, Tensile test without extensometer on foils and strips of aluminium and wrought aluminium alloys with a thickness up to 0,179 mm DIN EN 1561, Founding Grey cast irons DIN EN ISO 22674, Dentistry Metallic materials for fixed and removable restorations and appliances 14