کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1573656 | 1514685 | 2016 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and numerical studies of coupling size effects on material behaviors of polycrystalline metallic foils in microscale plastic deformation
ترجمه فارسی عنوان
مطالعات تجربی و عددی اثرات اندازه ی اتصال بر رفتار مواد پلی کریستال فلزی در تغییر شکل پلاستیکی میکروسکوپ
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کلمات کلیدی
اثرات اندازه، پلاستیک کریستال، میکرو تنش، مدل مواد غیر محلی، جابجایی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
A more comprehensive investigation of size effects is essential for the design and optimization of micro-metal forming processes. In this work, the micro-tension of polycrystalline copper foils with different thicknesses and grain sizes is investigated using both experimental and numerical techniques. A nonlocal physically based crystal plasticity (CP) FEM using the densities of statistically stored dislocations and geometrically necessary dislocations as the internal state variables is applied to simulate the micro-tensile operations. The micro-tensile experiments show that the mechanical properties of copper foils are affected synthetically by the grain size, sample size, and crystallographic orientation. The simulation results show good agreement with the experimental results in terms of flow stress. In addition, the first order and second order size effects are well captured. The research finds that the number of grains across the thickness is a prominent factor to affect the intergranular and intragranular deformation heterogeneities, which play a key role in controlling the formation of shear bands, the strength, and failure modes of materials at microscale. The modeling gives access to more physically based details about the microscale plastic deformation, and shows the potential of using nonlocal physically based CPFEM in the investigation of micro-metal forming.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 658, 21 March 2016, Pages 450-462
Journal: Materials Science and Engineering: A - Volume 658, 21 March 2016, Pages 450-462
نویسندگان
Haiming Zhang, Xianghuai Dong,