کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7211673 | 1469278 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of tension-compression asymmetry of the plastic flow on ductility and damage accumulation of porous polycrystals
ترجمه فارسی عنوان
نقش عدم تقارن تنش - فشرده سازی جریان پلاستیکی بر انعطاف پذیری و تجمع آسیب های پلی کریستال های متخلخل
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کلمات کلیدی
دوقلو، پلی کریستال های متخلخل تکامل تخلخل، شکل پذیری،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
چکیده انگلیسی
The influence of the tension-compression asymmetry of the plastic flow, due to intrinsic single-crystal deformation mechanisms, on porosity evolution and the overall ductility of voided metallic polycrystals is assessed. To this end, detailed micromechanical finite-element analyses of three-dimensional unit cells containing a single initially spherical cavity are carried out. The plastic flow of the matrix (fully-dense material) is described by a criterion that accounts for strength-differential effects induced by deformation twinning of the constituent grains of the metallic polycrystalline materials. The dilatational response of porous polycrystals are calculated for macroscopic axisymmetric tensile loadings corresponding to a fixed value of the stress triaxiality and the two possible values of the Lode parameter. It is shown that damage accumulation, and ultimately ductility of the porous polycrystals are markedly different as compared to the case when the matrix is governed by von Mises criterion. Most importantly, a direct correlation is established between the macroscopic material parameter k that is intimately related to the particularities of the plastic flow of the matrix and the rate of damage accumulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ciência & Tecnologia dos Materiais - Volume 29, Issue 1, JanuaryâApril 2017, Pages e234-e238
Journal: Ciência & Tecnologia dos Materiais - Volume 29, Issue 1, JanuaryâApril 2017, Pages e234-e238
نویسندگان
J.L. Alves, M.C. Oliveira, L.F. Menezes, Oana Cazacu,