کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5468022 | 1518926 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thickness-dependent fracture behaviour of amorphous carbon films on a PEEK substrate under nanoindentation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present work studied the fracture behaviour of a brittle film/ductile substrate under a sphero-conical indenter. To understand the effect of film thickness, the amorphous carbon films were prepared with different thicknesses, i.e. 140Â nm, 400Â nm and 1300Â nm, on a poly-ether-ether-ketone substrate. It was found that multiple ring-like cracks occur for all the films under nanoindentations. However, film spalling between ring cracks was noticed for the film with 1300Â nm thickness; whereas spalling was observed at the center of indent for the thin film with the thickness of 140Â nm. Finite element analysis revealed that different crack patterns were resulted from different stress distributions in the film-substrate systems, depending on the film thickness. In particular, when the film is thick the cracks were mostly caused by the contact stress induced by the indenter. For a thin film, however, the ring cracks could be formed due to the bending stress caused by the plastic zone in the substrate. Moreover, a dimensional analysis was preformed to quantitatively determine the ratio of bending stress and contact stress in different brittle film/ductile substrate system. The new findings of the thickness effect are important for fracture analysis of brittle films using nanoindentations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 144, October 2017, Pages 107-115
Journal: Vacuum - Volume 144, October 2017, Pages 107-115
نویسندگان
Kunkun Fu, Li Chang, Lin Ye, Yongbai Yin,