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Trust is good, control is better—testing autoinjectors with ZwickRoell. While in EN and ISO the movement of the compression platen is typically measured by the crosshead travel of the testing machine with a defined minimum accuracy, ASTM D describes an additional method that compensates for the self-deformation of the testing machine. ISO , Method B also describes direct compressive deformation measurement of the specimen.
Method B provides deformation data and a compression modulus that is less influenced by force application effects. If deformations are significant, the measured deformations differ significantly from those in other methods because of the compression sphere that forms and do not provide reproducible results.
News Contact us. Purpose of the Test Compressive properties include the compressive strength, maximum compressive deformation, and the compression modulus, which describes the short-term deformation under load. The standards differ in the dimensions of the specimen and in the test execution.
Alternately, all standards permit direct displacement measurement of the compression platen. This makes it possible to effectively determine compression platen movement with a accuracy of over 5 micrometers.
Additional measurement of compression platen movement by direct displacement measurement is not required. For measurements to ISO Method B , ZwickRoell offers mechanical and optical travel measuring systems for the precise recording of specimen deformation.
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ASTM D1621 – Compression Testing of Rigid Cellular Plastics
Historical Version s - view previous versions of standard. More D Test data is obtained, and from a complete load-deformation curve it is possible to compute the compressive stress at any load such as compressive stress at proportional-limit load or compressive strength at maximum load and to compute the effective modulus of elasticity. The tests cannot be considered significant for engineering design in applications differing widely from the load - time scale of the standard test. Such applications require additional tests such as impact, creep, and fatigue.
Compression Test on Hard Foam
This post is intended to help you understand the basic test procedure and the equipment needed to perform this test with certainty. When you are ready to test your materials to this standard, please refer to the official ASTM D specification. Forgot your password? Previous Next. Procedure: Make sure that your samples are the correct size as indicated in the specification. Precisely measure the area of each specimen using the method recommended in the specification. Center the sample in the compression platens and begin applying load at the indicated rate.