1、UDC 621.886.1 : 620.176 DEUTSCHE NORM October 1992 Determination of shear strength of pins English version of DIN EN 28 749 (IS0 8749 : 1986) DIN - EN 28 749 Stifte und Kerbstifte; Scherversuch (IS0 8749 : 1986) This standard incorporates the English version of Is0 8749. Supersedes DIN IS0 8749, Apr
2、il 1991 edition. European Standard EN 28 749 : 1992 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword The publication of this standard is in keeping with a decision made by CENTTC 185 to adopt, without alteration, a series of IS0 Standards covering pins as Eu
3、ropean Standards. The responsible German body involved in their publication is the Normenausschu Mechanische Verbindungselemente (Fasteners Standards Committee). As a consequence, the DIN Standard covering determination of the shear strength of such pins, DIN IS0 8749, has been superseded by this DI
4、N EN Standard. Previous edition DIN IS0 8749 : 04.91. International Patent Classification F 16 B 19/02 G O1 N 3/00 EN comprises 3 pages. DIN EN 28 749 Engl. Price group 5 Beur Veflag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 04.93 Sales No. 11 05 EUROPEAN STAND
5、ARD NORME EUROPENNE EUROPAISCHE NORM EN 28 749 July 1992 UDC 621.886.1 : 620.176 Descriptors: Fasteners, grooved pins, pins, shear test, test equipment. English version Pins and grooved pins Shear test (IS0 8749 : 1986) Goupilles et goupilles canneles; essai de cisaillement (IS0 8749 : 1986) Stifte
6、und Kerbstifte; Scherversuch (IS0 8749 : 1986) This European Standard was approved by CEN on 1992-07-17 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
7、status of a national standard without any alteration. Up-to-date 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).
8、 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, Denmark, Finland, France, Germa
9、ny, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. GEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1992. Cop
10、yright reserved to all CEN members. Ref. No. EN 28 749 : 1992 E Page 2 EN 28 749 : 1992 Foreword In 1992, CENTTC 185 Threaded and unthreaded fasteners and accessories, the Secretariat of which is held by DIN, decided to submit International Standard IS0 8749 : 1986 Pins and grooved pins; shear test
11、to Formal Vote. The result was positive. In the countries bound to implement this European Standard, a national standard identical to this European Standard shall be published, and conflicting national standards withdrawn, by 1993-01 -31 at the latest. In accordance with the CENXENELEC Internal Regu
12、lations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the Internati
13、onal Standard IS08749 : 1986 was approved by CEN as a European Standard without any modifi- cation. Page 3 EN 28 749 : 1992 1 Scope and field of application This International Standard specifies the test method for shear testing of metallic pins with nominal diameters from 0,8 to 25 mm inclusive. 2
14、Principle The test consists of subjecting a pin to a double shear load using a suitable test fixture in a testing machine and recording the maximum load to fracture. 3 Test equipment and method The shear test is performed in a fixture (a typical fixture is shown in the figure) in which the pin suppo
15、rt members and the member for applying the load have holes with diameters con- r shear Load 1 forming to the nominal pin size (tolerance H6) and a hardness of not less than 700 HV. The clearance between the supporting member and the load member shall not exceed 0,15 mm. The shear planes shall be at
16、least one pin diameter away from each end and at least two diameters apart. Pins too short to be tested by double shear shall be tested by shearing two pins simultaneously in a cingle shear. Spring pins shall be mounted in the test fixture with the slot up- wards. Pins shall be tested to fracture. T
17、he maximum load applied to the pin coincident with or prior to pin fracture shall be regarded as the double shear strength of the pin. Pins tested for shear strength shall show a ductile shear without longitudinal cracks. The speed of testing shall not exceed 13 mm/min. Hardened suppori block L Spacers and guides for shear block Figure - Typical pin shear test fixture
