کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
770668 1463127 2013 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fitting small data sets in the lower ductile-to-brittle transition region and lower shelf of ferritic steels
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Fitting small data sets in the lower ductile-to-brittle transition region and lower shelf of ferritic steels
چکیده انگلیسی

The use of a 3-parameter Master Curve approach where the Weibull modulus is 4 and a minimum toughness value of 20 MPa m1/2 is now well accepted and standardised. The standard allows the use of a minimum of six specimens, tested at a single temperature, to produce the Master Curve. However, the examination of a small data set can lead to difficulties when trying to fit to this standard formula especially if the toughness is larger than 20 MPa m1/2. A small data set obtained from lower shelf testing of a ferritic pressure vessel steel is used to explore some of the issues related to the Weibull modulus and minimum toughness and how a user might try to fit such data. Finite element models are used to show that enhanced minimum toughness values larger than 20 MPa m1/2 are unlikely to have arisen from warm pre-stressing. The implications for the Master Curve of the different fitting options are also briefly explored.


► KIC tests were conducted on a small number of ferritic steel specimens.
► Numerous Weibull and normal distributions were fit to the test data.
► It is shown that the Kmin of the steel tested is probably larger than 20 MPa m1/2.
► Finite element analysis shows that the increased KIC is not due to warm-prestress.
► Implications for the Master Curve of the different fitting options is explored.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 98, January 2013, Pages 350–364
نویسندگان
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