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laminated shells has attracted several researchers during the past decade. Considerable attention has been paid to dynamic analyses, including free vibration, impact, transient, shock, etc. From the review of literature, it is observed that shell research has been conducted with emphasis on complicating effects in material such as damping and piezoelectric behavior and complicated structures such as stiffened shells with cutout with various boundary conditions. Applications of various shell theories such as classical, shear deformation, 3D, and nonlinear for various shell
-soil interface. An isotropic elastic model was used for the pile, piles cap, tunnel lining and tunnel boring machine shield (TBM). Zarev (2016) stated that the advanced models like HS and HS small model are required for obtaining a realistic prediction of the deformations during shield tunnelling. Table 2 summarizes the soil properties adopted from Miro et al., 2012 . According to Zarev (2016), the HS model allows for accounting the plastic collapse (isotropic hardening cap plasticity) as well as plastic shearing due to deviatoric loading with shear/frictional hardening
For metal forming problems, even for a simple forming technology, finite element analysis can provide a solution for calculating deformations, determining stress and strain distributions. The aim of this study is to create a parametric finite element model for deep drawing technology, by which technological optimization as well as theoretical problems can be solved. By performing parameter studies, numerous cases can be analyzed.
In the paper the parametric study of free vibration analysis of sandwich panel is presented. Effects of the face sheet material, as well as those related to the ply-thickness, core thickness and length of the panel are investigated. There are used approaches based on the first order shear deformation theory. Natural frequencies of sandwich panel are calculated by using analytical solution, which is compared with A NSYS results.
The use of high resistance materials in nowadays structures has led to an increase in the span of the floors. Despite meeting the resistance and deformation criteria, floors might vibrate excessively due to increased slenderness. Based on a real-scale model experimental program, a parametric study has been developed in order to asses the vibration performance of prestressed hollow-core slab system on spans larger than the ones on which tests have been conducted, and the interaction between the concrete that have been poured in different stages. The measurements have been performed using Brüel and Kjӕr equipment, whereas the study has been carried out using Abaqus 6.11. finite element software. The simulations have been made by increasing the span of the slab, in order to observe the variation of the fundamental frequency. Also, the simulations have been conducted with different types of concrete topping thickness. The minimum acceptable value of the fundamental frequency has been considered 8Hz, according to existing literature.
Based on the results of experimental tests, presented in the first part of this paper, Part 1-Experimental Investigations (Ghindea M., Catarig A., Ballok R.) advanced numerical simulations were performed using FEM based software Abaqus. The recently arise of high speed computers and advanced FEM software packages allow to create and solve extensively detailed 3D models. The aim of this second part of the paper is to develop accurate FEM models for better approach of the studied beam-to-column connections. The paper presents the designed numerical models and the results for four bolted beam-to-column connections using top-and-seat and/or web angle cleats, in different configurations. The objective of this paper is to achieve functional numerical models which, by faithfully running, reproduce the experimental results. Thus, calibrating the numerical results with the experimental ones it can be perform then parametric studies, achieving reliable results for similar configurations of joints. The results obtained after numerical simulations were compared with experimental data. The behavior moment-rotation curve and the deformation process of the experimental captured specimens were virtually reproduced with minimum deviation.
This paper presents the numerical part of the research program on concrete-filled steel columns. Nonlinear, three dimensional FE analysis of axial compression, was conducted using the finite element program ABAQUS. The numerical results were validated through comparison with experimental data in terms of ultimate loading and deformation modes. Modeling related problems such as the definition of boundary conditions, imperfections, concrete-steel interaction, material representation and others are investigated using a comprehensive parametric study. The developed FE models will be used for an enhanced interpretation of experiments and for the predictive study of cases not included in the experimental testing.
The purpose of the paper was to determine the impact of UV-C irradiation of seed potatoes on the formation of tuber defects in the progeny crop. The field experiment was carried out in 2016-2018, and the object of research was potato plants of the Vineta, Lord and Owacja varieties. Different heights of the UV-C radiator above the chamber bottom (40-100 cm) and exposure times (1-30 min.) were used. Data was analyzed with the STATISTICA 13.3 program, at the assumed significance level α = 0.05, using a non-parametric test χ2 for multidimensional contingency tables. In the scope of the parameters of the chamber for UV irradiation of plant material adopted in the experiment, no statistically significant UV-C effect on potato tuber defects was demonstrated. In the potato tuber crop of the examined varieties, shape deformations in the form of kidney and spindle disease were identified. The crop of potato obtained from seed potatoes irradiated with UV-C demonstrated a lower percentage of deformed tubers, as compared to the control combination.