BS ISO 17340:2014 pdf download – Metallic materials — Ductility testing — High speed compression test for porous and cellular metals.
1 Scope This International Standard specifies methods for high speed compression testing, at room temperature, of porous and cellular metals having a porosity of 50 % or more. The speed range applicable to this test method is 0,1 m/s to 100 m/s (or 1 s −1 to 10 3 s −1 in terms of the initial strain rate when the specimen height is 100 mm). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines ISO7500-1,Metallicmaterials—Verificationofstaticuniaxialtestingmachines—Part1:Tension/compression testing machines — Verification and calibration of the force-measuring system ISO 13314, Mechanical testing of metals — Ductility testing — Compression test for porous and cellular metals ISO 80000-1, Quantities and units — Part 1: General 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 13314 and the following apply. 3.1 test speed movement speed of the pressing jig, which applies the compressive force to the test piece, when the pressing jig contacts the test piece 3.2 initial strain rate value derived by dividing the test speed by the initial height of the test piece 3.3 sampling frequency frequency used to sample the measurement data per unit time 3.4 drop height initial distance between the pressure application plane of the pressing jig and the top surface of the test piece in the drop weight impact testing machine
4 Principle This test consists of applying an impact force at test speeds between 0,1 m/s and 100 m/s to porous and cellular metals and measuring the compressive force and displacement for evaluation of their high- speed compressive deformation characteristics, such as plateau stress and energy absorption. Test methods that apply high-speed compressive forces to porous and cellular metals are the drop weight impact test and the servo-type high-speed compression test. The drop weight impact test applies the compressive force by dropping a weight from a specified height. The test speed is controlled by the drop height. Due attention should be paid to the fact that the weight will be decelerated during the period of compressive deformation. When the drop height necessary to reach the specified test speed cannot be obtained, application of an initial velocity to the weight is possible. The servo-type high-speed compression test applies the compressive force using a hydraulic or electric high-speed servo mechanism. The test speed is changed by the servo control. The drive unit shall be capable of following the test speed. 5 Testing machine 5.1 Type of testing machine The testing machines to be used for high-speed compression testing of porous and cellular metals are the drop weight impact testing machine and the servo-type high speed compression testing machine.