Papers by Keyword: Computational Analysis

Abstract: There is a growing demand in the dental implant sector which aims to recreate the exact function and appearance of natural teeth, including strength, textures, and seamless blending with nearby teeth. Therefore, choosing the best crown material is a vital and challenging decision. To address this challenge, current study employs a comprehensive approach using Finite Element Analysis (FEA) on a 3-D CAD model. The stress analysis was carried out on three different crown materials - commercially pure Titanium (cp Ti), Zirconia (ZR), and Lithium Disilicate (LD) and compared their performance with that of human tooth material. The computational analysis results reveal that the pure Titanium (cp Ti) crown has shown the least deformation while the LD crown has showed the highest deformation under same loading conditions. When maximum stress is compared, Titanium showed the highest value, followed by Zirconia, whereas Lithium Disilicate (LD) demonstrated stress and deformation levels comparable to those of natural teeth.

Abstract: The paper discusses one of possible approaches for speedup of computational analysis of reinforced concrete slabs on foundation. The parallel processing is utilised to accomplish this task. The studied structure is divided to several parts are processed in parallel. A solution of real problems which can include iterative procedures and different levels of interaction between them, however it requires refinement and adaptation of such procedures.The main aim of the paper is to discuss these challenges and to propose solution of them for the particular case of the concrete and reinforced concrete slabs on a foundation.

Abstract: In the current study, two extreme cases are considered for the dispersion of carbon nanotubes(CNTs) in a polymeric matrix: randomly-oriented and randomly-aligned. The representative volume element (RVE) is used to represent the composite material consisting of epoxy resin matrix and CNT-reinforcement. The finite element method acts as the computational tool to conduct the simulations and investigate the effective parameters, i.e., the influence of the aspect ratio and the orientation, on the thermal conductivity of the matrix. A Fortran subroutine was used for both generation and analysis of the models by means of the MSC Marc finite element package and a Python script was used for the sensitivity analysis. The results indicate that optimum performance of the CNTs in terms of thermal conductivity can be reached by orienting them along the temperature gradient whereas a random distribution improves the conductivity by a smaller magnitude.

Abstract: Metal structures, given their broad plastic deformation capacity, have been often at the core of research for the evaluation of the post elastic behavior via the direct methods of plasticity. Limit and shakedown analysis were often exploited to determine the plastic collapse load capacity, as they provide advantages in terms of computational robustness in comparison with incremental non-linear analysis. The aforementioned approach has been widely and effectively applied for steel structures, characterized by rigid-plastic behavior. Υet in the case of aluminium structures, there are special parameters to be considered, as they exhibit a relationship of round-house type, whose trend cannot be interpreted through the classic elastic-perfectly plastic material law idealization.The present paper aims to develop a limit and shakedown analysis formulation suitable for the safety assessment of 3D aluminium frame structures against plastic collapse. Research yielded the proposed two-surface methodology in the framework of stress resultant plasticity, which is capable of estimating the plastic collapse limit state of real-life aluminium frames, incorporating Eurocode 9 codified failure criteria and limited kinematic hardening. A numerical example of a 3D frame is realized utilizing the finite element method and the 3-node Timoshenko column-beam element, in order to showcase the proposed methodology and validate the influence of hardening effect.

Abstract: Numerical and analytical models dealing with different physics involved in pultrusion are combined in the optic of an integrated analysis of the process. The impregnation stage is simulated by means of a CFD multiphase model, evaluating the pressure and velocity field in the liquid resin. Composite temperature and degree of cure are inferred using 3D thermo-chemical models. Finally, contact conditions, stresses and strains are derived applying computational simulation and analytical models, in order to predict the final pulling force. Different product sizes are considered, simulating suitable processing condition.

Abstract: In this paper is study the performance of heat exchangers by using computational analysis method. In past decade’s years, many researchers had discovered that nanofluids have a brilliant efficient in the heat transfer process. They believes that applied the nanofluids in the heat transfer equipment would bring a better enhancement compare with the conventional cooling fluids. In the literature journals, the authors have specified focused on the thermal conductivity, specific heat, density, and viscosity of nanofluids. They believes these are the most significant factors of the working fluids that would influence the efficiency of heat exchanger. In this study, an imitated real-life marine transport used of shell and tube heat exchanger to be analyzed. The shell and tube sides of heat exchanger will be filled with Water or nanofluids and Water or seaWater in respectively. The nanofluids will be assumed as single-phase nanofluids with variant of volume fraction of copper and alumina. The computational result of Water at the shell and tube sides will be used as validation of data compared with the technical performance specification given by the supplier. Further, the efficiency of different volume fraction of nanofluids and the optimum of volume fraction of nanofluids in this system would be discussed in the simulation results.

Abstract: Using simulation software, numerical simulation and plateau tests are combined to create the plateau diesel engine process simulation model. External characteristics tests of the diesel engine, plateau simulation experiments and plateau vehicle tests are combined to verify the model. The maximum deviation of the results is less 10%. The simulation model is accurate, which provides a way to study plateau environmental adaptation of diesel engines.

Abstract: The article deals with the creation of models for the analysis of plastic zones generation in ductile cast iron. The aim is the study of the microplasticization process near the graphite particles border. In creating the graphite particle model there is randomly chosen shape and orientation of the particle. The basic characteristic of the shape is ovality (the ratio of the inscribed circle to the circumscribed circle). The size of plastic deformation and the size of the plastic area are monitored by the microplasticization process analysis. The results are statistically elaborated to determine the relationship between graphite particle ovality and microplasticization caused by an inclusion.

Abstract: This paper introduces the principles and methods of process performance of the compressor online test. The proposed monitoring system consisting of a computer and test analysis software, intuitive, real-time display the cylinder of transient pressure curve, and the curve real-time analysis of the performance of the machine and fault diagnosis.

Abstract: Based on the base isolated benchmark building, the dynamic calculation methods of the seismic response were established. Through the computational analysis and comparison of the non-isolation situation and two isolation situations, the influence of the isolation effect about base isolation system stiffness, damping and the method of stiffness arrangement were demonstrated on the platform of benchmark building. The isolated benchmark building was evaluated to offer some new basis about the model used in theoretical research and isolation designed as well as alternative ways to further broaden the base isolated benchmark building.