A Multiaxial Salt Spray Corrosion Fatigue Crack Growth Test System

Abstract

The invention relates to a multi-axis salt spray corrosion fatigue crack growth test system. This system includes a fatigue testing machine that provides Type I, Type II, Type III and composite fatigue loads to the sample through the tensile-shear-torsional multiaxial loading fixture; this system also includes a salt spray corrosion environment box. The salt spray corrosion environment box includes a salt spray corrosion box and a salt spray pre-generation box that are connected to each other through pipelines. The fog corrosion box provides the required salt spray environment for the fatigue crack growth test, and the tension-shear-torsional multiaxial loading fixture and the fatigue crack growth sample are all located in the salt spray corrosion box. This system can better measure the fracture mechanics parameters such as the fatigue crack growth rate under the joint action of multi-axial load and salt spray corrosion environment, and provide a basis for material selection design and life evaluation of marine equipment serving in salt spray corrosion environment and complex stress state. support.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, and relates to a multi-axis salt spray corrosion fatigue crack growth testing system. Background technique [0002] With the continuous development of social economy and the increasingly tight land resources, people have gradually shifted their development goals to the resource-rich ocean, and in recent years, it has shown a trend of accelerated development, and various marine engineering equipment is constantly being introduced. Since many marine engineering equipment (such as oil and gas resources exploitation, processing, storage and transportation equipment, etc.) More and more marine engineering equipment adopts the damage tolerance design method based on principles such as fracture mechanics. The typical characteristics of this type of equipment are long-term service in the marine environment, which is greatly affected by corrosion such as salt spray or seawater, and t...

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Problems solved by technology

[0003] Although the existing Chinese patent documents "a fatigue crack growth rate test environment device under a corrosive environment" (authorization number: CN101358929A), "a fatigue test test system under a corrosive environment" (public number: CN103439202A), "spring Salt spray fatigue test device" (public number: CN102944511A), "a salt spray environment device for fatigue performance test" (notice number: CN201589746U), "high temperature salt spray test device" (notice number: CN202994631U), etc. have been published Some corrosion fatigue performance tests and salt spray environment simulation devices have been carried out, but they still cannot meet the actual needs of testing the fatigue crack growth rate under the joint action of multiaxial load and salt spray environment

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