A Tension-bend Multiaxial Fatigue Test Mechanism

Abstract

The invention discloses a bending multi-axial fatigue test mechanism which is composed of an immobilizing end part, a bending vibration part, a flexible mechanism part, a tensile loading connection part and a blade-shaped test sample, wherein the immobilizing end part is arranged on the leftmost side of the test mechanism, and clamps the lower end part of the blade-shaped test sample; the bending vibration part clamps the other end of the blade-shaped test sample, and then is connected with the flexible mechanism part and the tensile loading connection part; due to the immobilizing end part, the stress state of the blade-shaped test sample is same as the constraint stress state of a real operating blade; a bending vibration load is applied to the bending vibration part by using a vibration exciter, and due to the connection of the flexible mechanism part and the bending vibration part, the bending rigidity of the whole bending multi-axial fatigue test mechanism is reduced, thereby facilitating the loading of the bending vibration load; the tensile loading connection part and the flexible mechanism part are connected for loading a tensile load in the direction of a main shaft. According to the invention, an effect that while a tensile load is applied in the direction of the main shaft of the blade-shaped test sample, a bending vibration load also can be applied in a direction perpendicular to the main shaft is achieved.

Description

technical field [0001] The invention relates to a stretch-bend multiaxial fatigue test mechanism, which belongs to the technical field of mechanical testing equipment. Background technique [0002] Impeller power machinery is widely used as the core power of high-end fields such as aviation, power stations, ships, missiles, tanks, and heavy-duty locomotives, as well as the main or auxiliary power of general industrial fields such as metallurgy, exploration, chemical engineering, and civil engineering. It occupies a very important position in the whole heavy industry system. The main part of the turbomachinery is the working blade. When the turbomachinery is working, it is not only subjected to a huge centrifugal force load, but also subjected to bending vibration loads caused by internal flow field distortion and mechanical vibration of the system. Bending vibration load is an alternating load, which can easily lead to fatigue fracture of the blade. At present, there are t...

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Problems solved by technology

Existing multi-axial fatigue testing machines cannot realize multi-axial fatigue tests in tension and bending

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