Publications

The reported study firstly presents the results of an extensive experimental program consisting of 9 full-scale I-shaped prestressed concrete beams. Each specimen is subjected to a four-point bending test with monotonically increasing load until failure occurs. The investigated parameters are the amount of prestressing, the amount of longitudinal and shear reinforcement and the shear spanto- effective depth ratio respectively. Continuous ...

In this paper, a hybrid structural finite element (FE) - acoustic wave based (WB) approach is formulated to avoid using extra acoustic FE in the case of a simple structural geometry but with complicated structural material properties. Following the formulation, the approach is implemented and validated. First, linear hexahedral solid elements with a selective reduced integration are implemented in an in-house code and are checked to be able to ...

© 2015 Elsevier Ltd. All rights reserved. A finite element (FE) approach for tension-tension fatigue damage in textile reinforced composites on meso-scale level (fabric unit cell) is proposed. S-N curves of a unidirectional composite (UD) out of the fatigue tests in fibre, transverse-fibre, in-plane-shear and out-of-plane-shear directions are used as the input for the impregnated yarns. The algorithm of multi-axial fatigue is applied to ...

© 2014 Marcin Luczak et al. This paper presents selected results and aspects of the multidisciplinary and interdisciplinary research oriented for the experimental and numerical study of the structural dynamics of a bend-twist coupled full scale section of a wind turbine blade structure. The main goal of the conducted research is to validate finite element model of the modified wind turbine blade section mounted in the flexible support structure ...

© 2018 The spatial distribution and orientation of carbon nanotubes (CNTs) have significant effects on the mechanical properties of nanocomposites. But what is the ideal CNT network morphology to achieve a desired mechanical performance? To help answer this question, we propose a novel computational approach to optimize position and orientation of CNTs in a nanocomposite to reduce stress concentrations. The presence of stress risers (either ...

Predicting the airborne sound insulation of a complex building element generally requires a detailed model of that element, as simplified analytical models such as an equivalent orthotropic plate are only accurate for the first few natural frequencies. A commonly adopted strategy therefore consists of constructing a detailed finite element model and computing the expected value of the sound reduction index by numerically integrating the ...

The interaction between bovine claws and a concrete floor with defined roughness and friction coefficients is described using a finite element model. The model was built by using x-ray tomography scanner images of an unloaded fore and hind bovine claw. These images were used to reproduce the geometry of the claw horn capsule, which was used to create a finite element model. Young's moduli of 382, 261, and 13.6 MPa were attributed to the dorsal ...

Purpose: Recent studies have emphasized the importance of anatomical ACL reconstruction to restore normal knee kinematics and stability. Aim of this study is to evaluate and compare the ability of the anteromedial (AM) and transtibial (TT) techniques for ACL reconstruction to achieve anatomical placement of the femoral and tibial tunnel within the native ACL footprint and to determine forces within the graft during functional motion. As the AM ...

© The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav. A meso-scale finite element model for static damage in textile composites was established. The impregnated yarn is taken as homogeneous and transverse isotropic material, whose mechanical properties are calculated using Chamis' equations. The damage modes are determined by using the Tsai-Wu criterion and additional criteria. The Murakami damage tensor is used ...