کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
831171 1470364 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of creep ductility in a ferritic martensitic steel using a hybrid strain energy technique
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Analysis of creep ductility in a ferritic martensitic steel using a hybrid strain energy technique
چکیده انگلیسی

Creep rupture data for a modified 9% Cr 1% Mo ferritic martensitic steel was statistically analysed to provide a description of a ductility exhaustion approach for the evaluation of creep damage that occurs in creep–fatigue dwells. Energy approaches have been previously used; however, these require the use of the creep–fatigue test data themselves to identify the constants. This paper describes an approach based on a hybrid strain energy density formulation that uses creep rupture data and hence aligned with time fraction or classical ductility approaches. These current methods, however, tend to be overly conservative. Ductility models also tend to be statistically problematic when fitting to some datasets, particularly when stress and temperature are highly correlated. The method developed here was found to give the highest correlation for the tested models and was statistically robust for collinearity and heteroskedastic behaviour.


► Development of a new method based on a hybrid energy approach to characterise ductility damage.
► This method overcomes issues with multi-collinearity of data sets particularly where temperature and stress are highly correlated.
► This technique reduces the large scatter and standard deviations typical of other existing ductility exhaustion methods.
► Provides a robust and easily implemented model with excellent model fits for use in creep–fatigue predictions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 33, January 2012, Pages 491–495
نویسندگان
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