کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5453385 | 1513875 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-equilibrium molecular dynamics simulations of the spallation in Ni: Effect of vacancies
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
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چکیده انگلیسی
The effects of defects on the fracture resistance of materials have attracted considerable attention recently. In the present work, the vacancy effects on the spallation in single-crystalline Ni are studied by nonequilibrium molecular dynamics simulations. The vacancy concentration ranges from 0% to 2.0%, and the spallation in shock wave loading along three low-index directions ([0Â 0Â 1], [1Â 1Â 0], and [1Â 1Â 1]) is investigated. We found that vacancies provide the sites of nucleation for compression-induce plasticity, and tension stress-induced plasticity plays the key role in void nucleation. Along the [0Â 0Â 1] direction, the degree of spall damage does not increase with the increase in vacancy concentration; however, along the [1Â 1Â 0] and [1Â 1Â 1] directions, it decreases with the increase in vacancy concentration when the vacancy concentration is higher than the threshold value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 137, September 2017, Pages 273-281
Journal: Computational Materials Science - Volume 137, September 2017, Pages 273-281
نویسندگان
Tian Qiu, Yongnan Xiong, Shifang Xiao, Xiaofan Li, Wangyu Hu, Huiqiu Deng,