This method is used to investigate
the compressive
behavior
of the test specimens, and for determining the compressive strength, compressive strengths at pre-defined deformations, compressive modulus, and other aspects of the compressive stress/strain relationship under the conditions defined.
The ISO 844 test method is suitable for use with cellular plastics.
In principle, the test specimen is
compressed along its major axis at a constant rate of displacement until the specimen has deformed as a percentage of the specimen's original height. The load sustained by the specimen is measured during this procedure.
We used hardened-steel
compression anvils used to apply the deformation load to the test specimen. These anvils are fitted to a tensile testing machine, usually of single-column or dual-column table-top design. The use of testing software, such as Bluehill® 2, test method is used to input specimen details, set the desired test control, automatically calculate the desired results & statistics and produce a test report all in accordance with the standard.
We suggest reviewing ISO 844 to fully understand the test fixture and results requirements.