Corrosion fatigue life prediction method based on damage evolution

Abstract

The invention belongs to technical field of metal material corrosion and particularly relates to a corrosion fatigue life prediction method based on damage evolution. The method includes following steps: carrying out a stress corrosion test to a to-be-tested material for determining a stress threshold value of the stress corrosion and a damage index; carrying out a fatigue test to the to-be-tested material for determining a fatigue damage parameter; determining a corrosion fatigue damage nonlinear evolution index of the to-be-tested material; and predicting a corrosion fatigue life of the to-be-tested material. A corrosion solution circulating device in the invention can achieve cyclic refreshing of a corrosion liquid in a metal material corrosion fatigue and stress corrosion test. The corrosion fatigue life is predicted through a method of combining theory with experimental investigation so that defects in an analytical method and a test method are overcome. The prediction method is reasonable and is accurate in result. The predicted result is free of any influence due to combination of environment and the material. The prediction method is simple in operation, is easy to carry out, is strong in popularizing performance and is convenient in engineering application.

Description

technical field [0001] The invention belongs to the field of corrosion of metal materials, and in particular relates to a corrosion fatigue life prediction method based on damage evolution, which is used for prediction of corrosion fatigue life of metal materials used in marine engineering, aerospace and the like. Background technique [0002] There are various structures that bear cyclic loads in engineering, such as marine engineering structures, aircraft, etc., and their service environments are corrosive to varying degrees. The corrosive environment will reduce the fracture toughness of the material, accelerate the initiation and propagation of cracks, and reduce the service life of the structure. Corrosion fatigue has become a serious problem faced by various structures subjected to cyclic loads in engineering. The research on corrosion fatigue performance and the prediction of corrosion fatigue life have become important contents in the durability and integrity design ...

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Problems solved by technology

The test method can be said to be the best method to solve the corrosion fatigue life of materials for a specific situation, but it is often limited by the test conditions or special requirements, and the results that may be made may deviate greatly from the facts

[0010] In addition, the neural network method, probability method, etc. for material corrosion fatigue life prediction can basically be said to be parameter analysis methods based on analytical methods, which do not overcome the shortcomings of analytical methods in essence. At the same time, these methods require There are many test samples, which brings inconvenience to engineering applications

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