Thermodynamic and kinetic parameters have been determined suitable for the numerical simulation of the curing reaction of the epoxy/anhydride based casting resin system Araldite CY 225/HY 225/filler. In particular, the decisive role of the heating rate on the evaluation of the kinetic parameters from dynamic DSC-experiments is discussed.
Within a 300 x 600 m
complex heterogeneous sodic grassland two techniques were compared for
assessing soil salinity. The standard technique is based on repeated field
instrumental measurements at 420 points. The alternative technique was
performed with the use of numerical simulation of salt accumulation carried out
on 3 profiles. These profiles have been selected as representatives of the
distinct classes, or map strata of salt accumulation, distinguished with
preliminary statistical clustering of the instrumental measuring points.
Simulated values were extrapolated for the 3 strata distinguished. The maps
obtained with the two techniques were statistically correlated. The use of
numerical simulation is cost-effective. Further improvements are expected from
a combination of improved numerical simulation and utilization of more strata.
Authors:Róbert Bordás, Santhosh Seshadhri, Gábor Janiga, Martin Skalej, and Dominique Thévenin
Numericalsimulation and Experimental Validation in an Exact Aortic Arch Aneurysm Model. In 4th European Conference of the International Federation for Medical and Biological Engineering
Authors:Cristian Vulcu, Aurel Stratan, and Dan Dubina
Dual-steel structural systems, in which mild carbon steel is used in dissipative members while high strength steel is used in non-dissipative ‘elastic’ members, can be very reliable and cost efficient. Because present seismic design codes do not cover this specific configuration, a research project started with the aim to investigate and evaluate the seismic performance of dual-steel building frames. The frames are considered to be moment resisting frames, dual concentrically braced frames and dual eccentrically braced frames. The paper makes a short description of the research project and the experimental program to be performed at the ‘Politehnica’ University of Timisoara.A number of numerical simulations have been performed for the beam-to-column joints that will be tested with the aim to assess their behavior under monotonic as well as cyclic loading. The material model used in the numerical simulations was calibrated based on the results from tensile tests. The assumptions considered in the modeling of the specimens, the loading procedure, as well as the results from the numerical analysis are finally presented.
excitation signal 0.1 m ω angular velocity of the excitation signal 10π/3.6 rad/s The numericalsimulations were carried out with Maple using ODE45 solver and 0.01 s interval [ 26 ], [ 27 ]. The simulation time was 50 s. 3.2 Using the RMS of acceleration The
In order to study the temperature changing rule of the crude oil in the storage tank, the wavelet finite element method, the traditional finite element method and the test were used to carry out the numerical simulation. Firstly, the thermal wavelet finite element was put forward established based on thermal finite element theory and the wavelet theory. And the computational model and three boundary conditions were established. And then the temperature changing rule of the crude oil in the storage tank in 24 h for three boundary conditions was obtained by using three methods, and the results showed that the wavelet finite element method had advantages in the numerical analysis of the temperature changing rule of the crude oil in the storage. And then the temperature distribution rule of the crude oil in the storage tank under different conditions in 5 h was obtained. And the temperature changing mechanism of the crude oil was summarized finally.
Authors:Adriana Ioan, Aurel Stratan, and Dan Dubina
Eccentrically braced frames are widely used as lateral-force resisting system for multi-storey buildings located in seismic areas. Capacity design principles used in modern seismic design codes are deemed to constrain plastic deformations to dissipative elements only, which in eccentrically braced frames are represented by links. The aim of using these frames is to reduce the repair costs and downtime of a structure hit by an earthquake. This objective is to be attained through removable dissipative members (bolted links) and re-centering capability of the structure. Numerical studies are performed in order to investigate the practical feasibility of the replacement procedure; analyzing dual frames obtained by combining steel eccentrically braced frames with removable bolted links with moment resisting frames. Practical solutions regarding order in which bolted links need to be replaced are proposed, as well as the mounting of some temporary tie braces, for safety measures during the link removal procedure.
This study introduces the old design methods of eye-bars of chain bridges and compares their results to the results of numerical calculations. The failure modes of four eye-bars with different head geometries have been investigated through experiments and numerical simulations, and the effect of the geometrical build-up of the chain heads on the failure mode is provided as well. Finally as a result of numerical calculations the elastic and plastic stress distribution in the eye-bar is shown as well.
Authors:T. Rolim, A. Freitas, S. Galdino, E. Filho, and C. Dantas
The conservation equations for particulate systems were utilized to investigate the fluid-dynamic behavior of a gas-solid mixture flowing along a vertical tube (riser) in a simplified model of a pilot catalytic cracking unit. Nuclear techniques were utilized for the determination of the flow parameters along the riser. The results show a satisfactory agreement between the theoretical data and those obtained by experimental tests.