کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
788484 | 1466091 | 2012 | 12 صفحه PDF | دانلود رایگان |
In this paper, the C (t) and C∗ integrals, stress redistribution time tred and creep crack-tip stress distributions in the compact tension (CT) specimens with various thicknesses have been calculated by the three-dimensional (3D) finite element method, and the out-of-plane creep crack-tip constraint induced by specimen thickness is quantitatively characterized and analyzed in detail. The results show that the out-of-plane creep crack-tip constraint in the CT specimens could be characterized and analyzed by the new constraint parameter R. The 3D creep crack-tip constraint increases with increasing specimen thickness, and the 3D effect becomes more pronounced with increasing the parameter C∗. There is a central region with higher creep constraint along the crack front, the size of the region increases with increasing specimen thickness, and decreases with increasing creep time and parameter C∗. The factors of influencing the out-of-plane creep crack-tip constraint are analyzed.
► Out-of-plane creep crack-tip constraint induced by specimen thickness was studied.
► The creep constraint could be characterized and analyzed by a new parameter R.
► Out-of-plane creep constraint increases with increasing specimen thickness.
► There is a central region with higher creep constraint along the crack front.
► Size of the central region decreases with increasing creep time and load level.
Journal: International Journal of Pressure Vessels and Piping - Volumes 96–97, August–September 2012, Pages 78–89