Load Ratio Estimation Through Striation Height and Spacing Analysis of an Aerospace Al Alloy 7475-T7351

It is well known that striation spacing may be related to the crack growth rate, d a /d N , through Paris equation, as well as the maximum and minimum loads under service loading conditions. These loads define the load ratio, R , and are considered impossible to be evaluated from the inter-spacing s...

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Bibliographic Details
Published inJournal of materials engineering and performance Vol. 20; no. 3; pp. 382 - 389
Main Authors Ruckert, C. O. F. T., Messias Filho, A. A., Bose Filho, W. W., Spinelli, D., Tarpani, J. R.
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.04.2011
Springer Nature B.V
Subjects
Aluminum base alloys
Amplification
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Estimates
Fatigue failure
Field emission
Materials Science
Mathematical analysis
Paris
Quality Control
Reliability
Safety and Risk
Striation
Tribology
electron microscopy
aerospace
aluminum
failure analysis
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Summary:It is well known that striation spacing may be related to the crack growth rate, d a /d N , through Paris equation, as well as the maximum and minimum loads under service loading conditions. These loads define the load ratio, R , and are considered impossible to be evaluated from the inter-spacing striations analysis. In this way, this study discusses the methodology proposed by Furukawa to evaluate the maximum and minimum loads based on the experimental fact that the relative height of a striation, H , and the striation spacing, s , are strongly influenced by the load ratio, R . Fatigue tests in C(T) specimens were conducted on SAE 7475-T7351 Al alloy plates at room temperature and the results showed a straightforward correlation between the parameters H , s , and R . Measurements of striation height, H , were performed using scanning electron microscopy and field emission gun (FEG) after sectioning the specimen at a large inclined angle to amplify the height of the striations. The results showed that for increasing R the values of H / s tend to increase. Striation height, striation spacing, and load ratio correlations were obtained, which allows one to estimate service loadings from fatigue fracture surface survey.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-010-9687-0