کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7987359 | 1515276 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural impact of creep in tungsten monoblock divertor target at 20Â MW/m2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural impact of creep in tungsten monoblock divertor target at 20Â MW/m2 Structural impact of creep in tungsten monoblock divertor target at 20Â MW/m2](/preview/png/7987359.png)
چکیده انگلیسی
In order to increase erosion lifetime of the divertor target, in the 2nd design phase of R&D work package 'Divertor' for European DEMO, armor thickness of tungsten monoblock divertor target is increased from 5â¯mm to 8â¯mm. By increasing armor thickness, surface temperature increases nearly linearly, which makes effect of creep no longer negligible at slow transients of 20 MW/m2. In this work, structural impact of creep in tungsten monoblock divertor target is for the first time quantitatively analyzed with the aid of finite element method. The numerical simulations have revealed that creep results in an increase of inelastic strain accumulation. With increasing armor thickness, tensile surface stress along x-axis (the longer edge at the plasma-facing surface of tungsten monoblock) reduces, while surface stress along z-axis (axial direction of the cooling tube) changes from tensile to compressive. Creep will accelerate this change. With increasing grain size, creep strain accumulation at loading surface increases due to higher creep rates, while plastic strain accumulation decreases. Creep can mitigate the risk of deep cracking by reducing the driving force for crack opening, and has a positive impact for preventing the contact between the upper parts of neighboring monoblocks in high heat flux tests.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Materials and Energy - Volume 14, January 2018, Pages 1-7
Journal: Nuclear Materials and Energy - Volume 14, January 2018, Pages 1-7
نویسندگان
Muyuan Li, Jeong-Ha You,