The method of accelerated fatigue testing of cable wire

One of the factors of technological order, affecting the durability of steel ropes, is the quality of the wire rope. The main criterion for the quality and uniformity of the metal cable wire are mechanical tests (for rupture according to GOST 10446, bending according to GOST 1579 and twisting according to GOST 1545). However, traditional bending and twisting tests, where the material of the wire specimen is subjected to periodic stretching and compression in the plastic deformation zone, cannot fully characterize the quality of the metal. The main criteria for the rejection of ropes are considered defective indicators on wire breaks, which are the result of fatigue failure, which is a process consisting of two phases – the formation of a macrofracture, and then its development until the complete destruction of the sample. To assess the quality of the wire rope material is enough to fix the moment of formation of macro-cracks. One way to implement this principle is to test the sample under resonant conditions. To improve the quality control of the wire rope is offered standard mechanical tests in accordance with GOST 3241 to complement the accelerated fatigue tests of the wire rope, the proposed design of the installation, based on the resonance mode, and the method of these tests.