ISO 12986-1:2014 pdf free

ISO 12986-1:2014 pdf free.Carbonaceous materials used in the production of aluminium – Prebaked anodes and cathode blocks
A bar-shaped test specimen is placed on two bearing blocks and a force is applied to its centre until the test specimen ruptures; the force is equally distributed on two points. The flexural strength is calculated from the maximum force, the distance between the supports, and the dimensions of the cross-section of the test specimen.
The device shall ensure a cardanic suspension and movable support blocks; see Figure 1. The radius of curvature of the bearing blocks and of the force edges shall be in the range 2 mm to 5 mm.
The distance between the points of support should be variable in order to adjust the measuring device to different sample geometries.
Cylindrical or prismatic specimens can be used, provided that the smallest dimension be at least twice the diameter of the largest structural constituent (e.g. maximum particle size) of the material to be tested, but not smaller than 4 mm. The length of the specimens shall be at least 3,5 times their width or diameter.
Choose the measuring range of the testing machine such that the expected load at failure is at least 1/10 of full scale. Centre the test specimen on the support, with the longitudinal axis perpendicular to the support edges. The width between supports shall be at least three times the width or diameter of the specimen. The distance between the force edges shall be equal to the width or diameter of the test specimen.
In the case of prismatic specimens, ensure that the specimens rest entirely on the support edges, that at least one loading edge is movable and that the loading edges transmit the force uniformly over the whole width to the test specimens. In the case of cylindrical specimens, it is recommended that support edges be used with a diameter about 2 mm larger than the diameter of the test specimens to prevent the specimens from rolling away.
Increase the force uniformly and shock-free at a rate (velocity of the force edge) of about 5 mm/min or about 0,5 N/mm2/s until the test specimen fractures. Determine the maximum force.ISO 12986-1 pdf free download.