Multiaxial Fatigue Test Fixtures for High Cycle Fatigue Testing Machines

Abstract

A multi-axis fatigue test fixture for a high-cycle fatigue testing machine, including two opposite clamp bodies, the clamping end of each clamp body is composed of an extension spindle and an extension sleeve, and the front end of the extension sleeve is provided with an internal thread , to cooperate with the external thread at the rear of the connecting shaft at the rear end of the arc-shaped fixture; the inner concave surface of the front-end of the arc-shaped fixture is provided with multiple locking devices at different angles from the vertical direction. The structure of the locking device is: the inner surface of the arc-shaped fixture There is a convex platform with a blind hole on the concave surface, and the conductive pad is placed in the blind hole. The sample connection block covers the conductive pad, and its limiting teeth cooperate with the limiting grooves on the convex platform; the surrounding of the convex platform is opened. There is an annular groove adapted to the side wall of the locking cover, the locking cover covers the sample connection block, and the locking cover is connected to the boss through threads; and there is a through hole on the locking cover, and the sample connection block Internally threaded through holes are provided on the top. The fixture is used in conjunction with a uniaxial high cycle fatigue testing machine for high cycle and multiaxial fatigue test research on samples.

Description

technical field [0001] The invention relates to a fatigue test fixture of a high-cycle fatigue testing machine, in particular to a multi-axis fatigue test fixture of a high-cycle fatigue testing machine, and belongs to the technical fields of machinery and materials. [0002] technical background [0003] Many parts and components in modern engineering work under cyclic loads, such as crankshafts, connecting rods, blades, railway bridges, wheels, nuclear reactors and power generation equipment, etc., and the failure mode is mainly fatigue fracture. For the convenience of analysis and research, fatigue is divided into two types according to the number of failure cycles, low cycle fatigue and high cycle fatigue. The stress level acting on parts and components is relatively high, and the number of failure cycles is generally less than 10 4 ~10 5 The fatigue is called low cycle fatigue; on the contrary, the stress level acting on parts and components is low, and the number of f...

AI Technical Summary

Problems solved by technology

[0005] Patent 200610112809.9 discloses a cross-shaped electric welding sample multi-directional fatigue loading fixture device, which realizes the multi-directional cyclic loading fatigue test fixture for the cross-shaped spot welding sample, but the patent has relatively large limitations on the requirements of the sample. Standard specimens, and can only perform tension-shear cycle multi-directional fatigue tests

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