کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9704025 | 1463874 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fatigue growth of a surface crack in a welded T-joint
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Fatigue growth of a surface crack in a welded T-joint Fatigue growth of a surface crack in a welded T-joint](/preview/png/9704025.png)
چکیده انگلیسی
Structural component failures due to fatigue loading often occur in welded T-joints, the geometry of which gives raise to a local stress increase that makes them preferential sites for crack initiation and propagation. In the present paper, the fatigue behaviour of a T-jointed blade in a hydraulic turbine runner is analysed both experimentally and numerically. For relatively small cracks, it is shown that the structural component geometry does not remarkably influence the stress-intensity factor (SIF) values, provided that the stress field in the vicinity of the crack is approximately the same. Therefore, in order to simplify the problem, a cracked finite-thickness plate is examined instead of the actual T-jointed blade. The SIFs along the front of a semi-elliptical surface flaw in such a plate are determined through a finite element analysis for different elementary loading conditions that can be employed to model the actual stress field at the expected crack location in the examined T-joint. Then, by applying the superposition principle and the power series expansion of the actual stress field due to the load applied to the T-joint being considered, an approximate SIF for the cracked T-joint is evaluated and used for fatigue crack growth simulations by also employing a two-parameter model based on the Paris law. The numerical results deduced are compared with those obtained from experimental tests. The agreement between the different results is quite satisfactory.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 27, Issue 1, January 2005, Pages 59-69
Journal: International Journal of Fatigue - Volume 27, Issue 1, January 2005, Pages 59-69
نویسندگان
Andrea Carpinteri, Roberto Brighenti, Hans-Jörg Huth, Sabrina Vantadori,