کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
825514 1470043 2009 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Size effects in the bending of thin foils
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Size effects in the bending of thin foils
چکیده انگلیسی

The plastic response of a thin foil under bending is analysed using the phenomenological flow theory of strain gradient plasticity proposed by Fleck and Willis [N.A. Fleck, J.R. Willis, A mathematical basis for strain gradient plasticity theory. Part I: scalar plastic multiplier, J. Mech. Phys. Solids 57 (2009) 161–177; N.A. Fleck, J.R. Willis, A mathematical basis for strain gradient plasticity theory. Part II: tensorial plastic multiplier, J. Mech. Phys. Solids 57 (2009) 1045–1057]. Both the scalar and the tensorial versions of the theory are considered. Numerical results for elasto-plastic and elasto-viscoplastic foils are obtained via minimum principles, and closed-form expressions are derived in the limit of vanishing elasticity. An elevation of both bending moment at yield and hardening rate is predicted with decreasing foil thickness. Predictions are in line with existing experimental data on nickel foils with inferred material length-scales in the range 1–12 μm. Finally, the theory is used to assess size effects on the strength of metallic foams.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Engineering Science - Volume 47, Issues 11–12, November–December 2009, Pages 1251–1264
نویسندگان
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