BS ISO 17340:2020 Metallic materials — Ductility testing — High speed compression test for porous and cellular metals

BS ISO 17340:2020 Metallic materials — Ductility testing — High speed compression test for porous and cellular metals. 6.2.6 Absorber The absorber shall he capable of stopping the weight and preventing it from damaging the load cell after compressing the test piece to the specified height. 6.3 Servo-type high-speed compression testing machine 6.3.1 General Among servo-type high-speed compression testing machines, the basic composition of the servo- hydraulic-type high-speed compression testing machine is shown in FigLlre..2. The servo-type high-speed compression testing machine consists of a pressing jig, load cell, displacement sensor, rupture pin, and stopper, as described in 6.3.2 through 6.3.6. 6.3.2 Pressing jig The pressing jig shall be the same as described in 6.2.3. 6.3.3 Load cell The load cell shall he the same as described in 6.2.4. 6.3.4 Displacement sensor The displacement sensor shall be the same as described in 6.2.5. 6.3.5 Rupture pin The rupture pin is a test force transmission part provided to protect the load cell and the pressing jig from damage resulting from excessively large compressive forces. The material and the size of the rupture pin shall be capable of resisting the required test force adequately and of breaking, without large plastic deformation, below the load capacity of the load cell and the pressing jig. 6.3.6 Stopper The stopper shall be provided between pressing jigs and shall be capable of stopping the movement of the pressing jigs after having deformed the test piece to the specified height. 7 Test piece 7.1 Preparation of test piece The test piece shall be prepared by machining, electro-discharge machining, etc., as specified in ISO 13314. Cutting into test pieces shall be executed with the utmost care so as not to alter the cellular structure or pore shape of the porous and cellular metals. 7.2 Shape and dimensions of the test piece The shape and dimensions of the test piece shall be as follows. a) The shape of the test piece shall be a square prism, a rectangular prism, or a column. b) The length of the shorter side or diameter of the test piece shall be no less than 10 times the average pore size. c) The average pore size shall be measured in the cut section. d) The initial height of the test piece, H 0 , shall be between one and two times the diameter or length of the shorter side of the test piece. In the...