Corrosion crack expansibility characterization and life estimation method

A technique for crack propagation and life estimation, which is used to test the strength of materials by applying repetitive force/pulsation force

Active Publication Date: 2015-11-18
北京睦邦仁科技有限公司
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Problems solved by technology

At present, there is still a lack of a more accurate and practical corrosion crack growth performance characterization model and life estimation method. Therefore, a simple and practical method for corrosion crack growth performance characterization and life estimation is invented. According to the constant loa

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  • Corrosion crack expansibility characterization and life estimation method
  • Corrosion crack expansibility characterization and life estimation method
  • Corrosion crack expansibility characterization and life estimation method

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Embodiment Construction

[0064] Image 6 For the flow chart of the method of the present invention, the present invention is realized in three steps, specifically:

[0065] Step 1. Corrosion crack growth performance da / dN-ΔK curve

[0066] figure 1 is the schematic diagram of the loading of the central crack tensile M(T) specimen, according to figure 1 The loading form and the national standard "Metallic Materials Fatigue Crack Growth Rate Test Method" (GB-T6398), the crack growth test is carried out in a corrosive environment. Apply the specified stress ratio R, observe and record the left and right crack lengths during the crack growth process, and calculate the average crack growth length a according to the left and right crack lengths, and obtain the constant load crack growth a-N data of aluminum alloy materials, using the secant method data processing

[0067] ( d a d ...

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Abstract

A corrosion crack expansibility characterization and life estimation method comprises the following steps: 1, obtaining the corrosion crack expansibility da/dN-deltaK curve of a material through constant load test; 2, considering influences of corrosion on the fracture threshold value, correcting a Walker formula, fitting the da/dN-deltaK curve through combining a binary linear regression theory, and constructing a corrosion crack expansibility characterization model; and 3, considering the interaction between the retardation effect and load under spectrum load, and estimating the corrosion spectrum-loaded crack expansion life of the material by adopting a Willenborg-Chang model and an accumulation integration technology. The method is simple and practical, allows the corrosion crack expansibility characterization model to be constructed and the spectrum-loaded crack expansion life to be estimated only through using the constant load crack expansibility curve and the actually measured flight load spectrum of the material in corrosion environment, and has great scientific significance and engineering application values.

Description

technical field [0001] The invention provides a corrosion crack propagation performance characterization and life estimation method, which belongs to the technical field of metal structure fatigue fracture reliability. Background technique [0002] In engineering practice, materials are often damaged by alternating loads and fatigue cracks appear; when the damage accumulation exceeds the allowable limit of the material, fracture failure occurs, thus posing a threat to the safety of the structure. Corrosion is an inevitable environmental factor in the use of materials. For example, aircraft serving in coastal areas are often corroded by the ocean atmosphere; oil pipelines are corroded by acidic substances in crude oil; in corrosive environments, the macroscopic properties and microstructure of materials often change. , the crack growth behavior is also different, therefore, the research on the corrosion crack growth behavior of materials has important practical significance. ...

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Application Information

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IPC IPC(8): G01N3/32
Inventor 熊峻江刘牧东王池权
Owner 北京睦邦仁科技有限公司
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