Determination of the crush resistance of the compressed channel

The compressed specimen, 100 mm in length, is cut from the newly compressed channel. This test specimen is placed in a suitable testing apparatus where both ends are fixed and subjected to a continuously increasing test load, uniformly distributed perpendicular to the axis direction and along its length, until the deformation in the load direction equals 10% of the outer diameter.

During the test, the rate of increase in deformation must not exceed 50 mm/min.

The compressive strength is determined based on the maximum test load F1 reached.