کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4922707 1430191 2017 73 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A three-invariant cap-plasticity damage model for cementitious materials
ترجمه فارسی عنوان
مدل آسیب پلاستیکی سه گانه برای مواد سیمانی
کلمات کلیدی
سیمان، بتن، پلاستیک-پلاستیک مکانیک آسیب مدل سازمانی، بارگیری چند محوری
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
We present a new continuum elastoplastic damage model for cementitious materials which captures their distinct behavior in tension and compression due to crack-induced damage and irreversible plastic deformation. It also describes their response under multi-axial loading with low to high confining pressures. A smooth, closed-convex three stress-invariant yield surface is developed which perpendicularly intersects the negative hydrostatic axis and is composed of a shear loading surface and an elliptical cap. It incorporates a plastic internal state variable (ISV) characterizing non-uniform hardening of both shear loading surface and elliptical cap, while the flow rule is considered to have volumetric non-associativity. Damage evolution laws incorporate two ISVs describing crack growth at the macroscale under tensile and compressive stresses separately. Overall damage under multiaxial loading explicitly considers the effect of confining stresses on damage evolution and stiffness recovery effects under cyclic loading. Model predictions are compared against several experimental results on various concretes and also against responses of recently reported models. The proposed model predicts distinctive features of concrete very well including hardening behavior in triaxial-compression and both pre- and post-peak volumetric behavior.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 108, 1 March 2017, Pages 186-202
نویسندگان
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