Quotation of fatigue durability test - fatigue durability test - Jiangsu Weikuo (view)

Torsion compression durability test of rubber bushing

Assembly method:

a) Fix the inner support tube, --- the inner support tube does not move or rotate during the test;

b) The external steel sleeve is connected to the test equipment, and torsion and load loading are applied to the external steel sleeve;

Loading mode:

a) Apply periodic load along the direction of f, fatigue durability test, the load value is 0~1.7 kn;

b) Torsion load: the external steel sleeve is subject to reciprocating torsion relative to the assembly position, and the torsion angle is ± 10 °;

c) The torsional load and the loading force have the same loading frequency, which is 0.5 hz;

d) The torsional load and the loading force reach the zui maximum value synchronously;

e) Test times: 2 million times

Fatigue fracture is the main failure mode of structural parts and components. According to statistics, 85% ^ - 90% of the heavy load caused by structural component failure is related to fatigue fracture. According to the view of fracture mechanics, the fatigue failure of metal structures is caused by the main crack expanding to the critical size. The fatigue durability test quotation shows that the life of the structure depends on the initiation and expansion of cracks in the dangerous parts of the structure. This method divides the fatigue fracture process into three stages. First, the component produces initial cracks under the action of alternating force (there is no unified standard for the definition of initial cracks, which is usually 0.5 ^ - 1mm); Second, the crack began to expand, and the reducer fatigue durability test resulted in large macro cracks; The third is the rapid expansion of cracks, which leads to rapid destruction, and its life is often very short, which is called instantaneous fracture life, and is not investigated in engineering.