A high-temperature tensile fatigue test fixture and method for flat specimens

Abstract

The invention discloses a high temperature tensile fatigue test fixture for a panel test piece and a method. The clamping for the panel test piece in a high temperature test is realized, so that the tensile fatigue test for the panel test piece can be performed under a high temperature condition. A hydraulic chuck of a fatigue machine is used for clamping an optical rod end of a central shaft and is connected with a connecting rod through a sleeve; a fixing nut is arranged on the central shaft; the fixing nut is used for limiting the downward movement of the sleeve; the connecting rod is fixed with the sleeve through a screw; the connecting rod is in threaded connection with a wedge-shaped chuck body; the central shaft passes through a through hole in the middle of the connecting rod; a shaft end is connected with a guiding platform; the guiding platform is located in a groove between two wedge-shaped clamp blocks and is used for guiding the wedge-shaped clamp blocks to move up and down; the test piece is clamped by the wedge-shaped clamp blocks in the wedge-shaped chuck body; the bottoms of the wedge-shaped clamp blocks are propped by the top end of the guiding platform; the two sides are in contact with the wedge-shaped plane in the wedge-shaped chuck body; the upwards movement of the wedge-shaped clamp blocks is limited. The high temperature tensile fatigue test fixture can meet the requirement for stably clamping the panel test pieces in various sizes and can realize the single-shaft tensile fatigue under the high temperature condition.

Description

technical field [0001] The invention relates to metal material fatigue performance testing equipment, in particular to a high-temperature tensile fatigue test fixture and method for flat specimens, and belongs to the field of design and manufacture of metal material uniaxial high-temperature tensile fatigue test fixtures. Background technique [0002] For the test requirements that require high temperature, large load, high frequency, and repeated tension, ordinary wedge-shaped fixtures cannot meet the test requirements, because there are few such fixtures that consider the test conditions of high temperature and high load at the same time. Fatigue failure tends to occur first in high temperature fatigue tests. After reviewing the existing patent documents, no high-temperature fixture for flat specimens that can solve the above problems has been found. Therefore, it is necessary to design a high-temperature tensile fatigue test fixture suitable for flat specimens. [0003] ...

AI Technical Summary

Problems solved by technology

The fixture design also does not consider the influence of high temperature test conditions

[0007] In summary, the existing technology cannot meet the requirements of the tensile fatigue test of flat specimens under high temperature conditions with large loads and high frequencies.

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