Large low-temperature fatigue experimental device for bolt

Abstract

The invention belongs to an experimental device, and particularly relates to a large low-temperature fatigue experimental device for a bolt. The large low-temperature fatigue experimental device comprises a low-temperature environmental box, wherein the low-temperature environmental box consists of a hollow cylindrical-special-vertical Dewar flask, and the upper end and the lower end of the low-temperature environmental box are respectively provided with a coaxial through hole; an upper pulling rod and a lower pulling rod are connected with a clamp system arranged in the low-temperature environmental box by the two through holes; the clamp system is used for clamping a tested experimental bolt; and the upper pulling rod and the lower pulling rod are connected with an external power source. The large low-temperature fatigue experimental device has the beneficial effect of being capable of being suitable for carrying out high-strength and large-size (the length is more than 1000mm and the diameter is more than phi40mm) bolt fatigue test under the environment with the ultralow temperature of being minus 196 DEG C.

Description

technical field [0001] The invention belongs to experimental devices, in particular to a large-scale bolt low-temperature fatigue experimental device. Background technique [0002] The invention belongs to the technical field of mechanical performance testing of mechanical parts of materials, and is suitable for low-temperature fatigue life testing of bolts made of special materials in the fields of nuclear energy, aerospace and the like. The fusion superconducting device consists of many complex parts connected by bolt fasteners and operates at the temperature of liquid nitrogen (-196°C). Since the fusion device is subjected to complex alternating loads during operation, low temperature (-196°C) fatigue tests of bolts with constant force and alternating force are required for bolt fasteners. Although the fatigue test technology is widely used now, the low temperature test environment is generally around -60°C, and the length of the sample does not exceed 10cm, the diameter...

AI Technical Summary

Problems solved by technology

Conventional fatigue machines cannot test the low-temperature fatigue of this type of bolts, which is mainly reflected in: this type of bolts requires 1:1 full-scale prototypes to be subjected to liquid nitrogen temperature fatigue; a batch of high-strength alloy materials such as Inconel718 and A286 are used to manufacture bolts; Bolt size parameter is large, its length exceeds 1000mm, diameter exceeds Ф40mm; the low temperature fatigue test of large size parameters and high strength bolts poses challenges to fixtures, tooling and tie rods connected to fatigue machines

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