کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1451407 988772 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shear band formation in columnar thermal barrier oxides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Shear band formation in columnar thermal barrier oxides
چکیده انگلیسی

Columnar thermal barrier oxides either impressed or impacted by projectiles at high temperature develop kink bands. The bands emanate from sub-surface sites adjacent to the contact zone and extend diagonally toward the substrate. At the boundaries, the columns are cracked, indicating that the material has been weakened, and rendering them preferred sites for material removal upon subsequent impact. In some cases, the bands reach the interface with the thermally grown oxide and initiate a delamination crack. The experimental challenges in characterizing the bands and in relating their occurrence to constituent properties and microstructure are extreme. To address this limitation, the present article explores methods for numerical simulation of the bands. By modeling the material within the columns as a minimally porous Gurson solid and treating the inter-columnar material as a low density foam, it will be demonstrated that bands can be simulated consistent with those observed experimentally.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 53, Issue 13, August 2005, Pages 3765–3773
نویسندگان
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