Salemizadeh Parizi, Fatemeh Mehrabi, Reza Karamooz-Ravari, Mohammad Reza
Published in
Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Transcatheter aortic valve implantation is a minimally invasive treatment for severe symptomatic aortic valve stenosis. Nitinol stents are proposed for aortic stenosis patients at high risk. In the present study, at different implantation depths in the aortic valve, the crimping and performance of Nitinol stents are investigated. To do so, a consti...
Luo, Wen Chau, Viet T. Bažant, Zdeněk P.
Published in
International Journal of Fracture
The dynamic ‘overstress’, i.e., the apparent increase of strength of concrete at very high strain rates (10–106\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^{6}$$\...
Steinke, Christian Zreid, Imadeddin Kaliske, Michael
Published in
Computational Mechanics
The finite element implementation of a gradient enhanced microplane damage model is compared to a phase-field model for brittle fracture. Phase-field models and implicit gradient damage models share many similarities despite being conceived from very different standpoints. In both approaches, an additional differential equation and a length scale a...
Itskov, Mikhail
Published in
Computational Mechanics
This paper is motivated by a recent study by Verron (Mecha Mater 89:216–228, 2015) which revealed huge errors of the numerical integration over the unit sphere in application to large strain problems. For the verification of numerical integration schemes we apply here other analytical integrals over the unit sphere which demonstrate much more accur...
Jebara, Khalil Ožbolt, Joško Hofmann, Jan
Published in
Materials and Structures
In the present article the results of a three-dimensional finite element study performed on a single headed stud anchor loaded in shear and failing in the so called pryout failure mode are presented and discussed. To verify the validity of the numerical model, recently performed experimental tests are simulated. It is shown that the model realistic...
Ožbolt, Joško Sharma, Akanshu İrhan, Barış Sola, Emiliano
Published in
International Journal of Impact Engineering
•Tensile behavior of concrete under high loading rates is numerically investigated.•3D FE code for multi body dynamics with fragmentation capability is used.•True strength due to material behavior and apparent strength due to inertia.•Results of any indirect tension test such as SHB test, needs careful interpretation.•Only true material strength sh...
Ožbolt, Joško Oršanić, Filip Balabanić, Gojko Kušter, Marija
Published in
International Journal of Fracture
Reinforced concrete structures, which are exposed to aggressive environmental conditions, such as structures close to the sea or highway bridges and garages exposed to de-icing salts, often exhibit damage due to corrosion. Damage is usually manifested in the form of cracking and spalling of concrete cover caused by expansion of corrosion products a...
Ožbolt, J. Lacković, V. Krolo, J.
Published in
International Journal of Fracture
In the present paper 3D rate sensitive constitutive model for modeling of laminate composites is presented. The model is formulated within the framework of continuum mechanics based on the principles of irreversible thermodynamics. The matrix (polyester resin) is modeled by employing a 3D rate sensitive microplane model. For modeling of fibers (gla...
Travaš, V. Ožbolt, J. Kožar, I.
Published in
International Journal of Fracture
In the paper, the results of numerical failure analysis of plain concrete beams loaded by impact three-point bending load are presented and discussed. The theoretical framework for the numerical analysis is continuum mechanics and irreversible thermodynamics. The spatial discretization is performed by the finite element method using update Lagrange...
Vořechovský, Miroslav Sadílek, Václav
Published in
International Journal of Fracture
The paper presents a follow-up study of numerical modeling of complicated interplay of size effects in concrete structures. The major motivation is to identify and study interplay of several scaling lengths stemming from the material, boundary conditions and geometry. Methods of stochastic nonlinear fracture mechanics are used to model the well pub...
