scholarly journals Modelling of Nanoindentation of TiAlN and TiN Thin Film Coatings for Automotive Bearing

2019 ◽  
Vol 8 (3) ◽  
pp. 7194-7199
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Yield Strength ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Poisson's Ratio ◽  
The Finite Element Method ◽  
Element Method

Bearings are critical components for the transmission of motion in machines. Automotive components, especially bearings, will wear out over a certain period of time because they are constantly subjected to high levels of stress and friction. Studies have proven that coatings can extend the lifespan of bearings. Hence, it is necessary to conduct studies on coatings for bearings, particularly the mechanical and wear properties of the coating material. This detailed study focused on the mechanical properties of single-coatings of TiN and TiAIN using the finite element method (FEM). The mechanical properties that can be obtained from nano-indentation experiments are confined to just the Young’s modulus and hardness. Therefore, nanoindentation simulations were conducted together with the finite element method to obtain more comprehensive mechanical properties such as the yield strength and Poisson’s ratio. In addition, various coating materials could be examined by means of these nanoindentation simulations, as well the effects of those parameters that could not be controlled experimentally, such as the geometry of the indenter and the bonding between the coating and the substrate. The simulations were carried out using the ANSYS Mechanical APDL software. The mechanical properties such as the Young’s modulus, yield strength, Poisson’s ratio and tangent modulus were 370 GPa, 19 GPa, 0.21 and 10 GPa, respectively for the TiAlN coating and 460 GPa, 14 GPa, 0.25 and 8 GPa, respectively for the TiN coating. The difference between the mechanical properties obtained from the simulations and experiments was less than 5 %.

Young's Modulus and Poisson's Ratio Estimation Based on PSO Constriction Factor Method Parameters Evaluation

2019 ◽  
Vol 9 (2) ◽  
pp. 33-46
Author(s):  
George Lucas Dias ◽  
Ricardo Rodrigues Magalhães ◽  
Danton Diego Ferreira ◽  
Bruno Henrique Groenner Barbosa
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Young’S Modulus ◽  
Cantilever Beam ◽  
Poisson’S Ratio ◽  
Inverse Analysis ◽  
Young's Modulus ◽  
Poisson's Ratio ◽  
Factor Method ◽  
Constriction Factor

The knowledge of materials' mechanical properties in design during product development phases is necessary to identify components and assembly problems. These are problems such as mechanical stresses and deformations which normally cause plastic deformation, early fatigue or even fracture. This article is aimed to use particle swarm optimization (PSO) and finite element inverse analysis to determine Young's Modulus and Poisson's ratio from a cantilever beam, manufactured in ASTM A36 steel, subjected to a load of 19.6 N applied to its free end. The cantilever beam was modeled and simulated using a commercial FEA software. Constriction Factor Method (PSO variation) was used and its parameters were analyzed in order to improve errors. PSO results indicated Young's Modulus and Poisson's ratio errors of around 1.9% and 0.4%, respectively, when compared to the original material properties. Improvement in the data convergence and a reduction in the number of PSO iterations was observed. This shows the potentiality of using PSO along with Finite Element Inverse Analysis for mechanical properties evaluation.

A Finite Element Simulation Study on the Properties of a Multi-Material Based Auxetic Metamaterial

2019 ◽  
Author(s):  
Yutai Su ◽  
Xin Wu ◽  
Jing Shi ◽  
Jin Wang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Large Strain ◽  
Poisson's Ratio ◽  
Material Structure ◽  
Geometry Design ◽  
Trade Offs

Abstract Auxetic metamaterials have unique structural designs exhibiting zero or negative Poisson’ ratios during stretch/compression processes, which enable many critical applications such as sensing technology, wearable devices, and weight reduction parts. However, it is difficult to achieve ideal performance of various structural designs through geometry manipulation due to the beam/wall buckling under large strain. One way to minimize the occurrence of buckling is by introducing the high elasticity on the joints, but trade-offs exist among different mechanical behaviors. To this end, this study proposes to use a multi-material combining with the structure optimization to design an auxetic structure. The basic re-entrant structure is employed due to its simplicity, and finite element method (FEM) is adopted to demonstrate the effectiveness of this newly proposed strategy regarding the auxetic behaviors. For this multi-material structure, a different Young’s modulus is designed to apply on the additional arch structure. A series of simulations, which consider the influence of the mechanical properties, are conducted to investigate the change of auxetic behaviors such as stress distribution, Poisson’s ratio, and equivalent Young’s modulus against the applied material properties. The results indicate that the mechanical properties are strongly affected by the geometry design and the applied materials properties. Meanwhile, the buckling effect of the beam/wall could be eliminated if the hinge strength is small enough. The trade-off between equivalent mechanical properties and Poisson’s ratio could also be tuned through this newly material-based design.

Mechanical properties of a hierarchical honeycomb with sandwich walls

2016 ◽  
Vol 230 (16) ◽  
pp. 2765-2775 ◽  
Author(s):  
Ting Yi
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Fracture Toughness ◽  
Finite Element ◽  
Relative Density ◽  
Young’S Modulus ◽  
Elastic Limit ◽  
Young's Modulus ◽  
Peak Strength ◽  
Element Method

The in-plane compressive collapse and fracture toughness of a hierarchical hexagonal honeycomb with sandwich walls consisting of corrugated cores are studied by using finite element method. Its near-optimal configuration is identified by maximizing its elastic limit, which is determined by three competing failure modes including plastic yielding of the larger struts, or elastic wrinkling of the face sheets of the larger struts, or elastic buckling of the smaller struts. The overall mechanical properties of the optimal hierarchical honeycomb, including the Young’s modulus, elastic limit, peak strength, and fracture toughness are obtained from finite element method simulation and compared with analytical predictions, and the discrepancy between the two is explained. The optimal hierarchical honeycomb is found to be superior to its equivalent mass first-order honeycomb in all the mechanical properties listed above when the relative density is low (about 10%). Moreover, the Young’s modulus, elastic limit and peak strength under plastic failure mode, and the fracture toughness of this optimal hierarchical honeycomb are shown to depend linearly upon its relative density. This paper provides additional insights into hierarchical cellular materials.

scholarly journals Young’s modulus and Poisson’s ratio of the deformable cement adhesives

2020 ◽  
Vol 27 (1) ◽  
pp. 299-307
Author(s):  
Jacek Karpiesiuk ◽  
Tadeusz Chyzy
Keyword(s):  
Finite Element Method ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Cement Mortar ◽  
Young's Modulus ◽  
Experimental Studies ◽  
Poisson's Ratio ◽  
The Finite Element Method ◽  
Floor Systems ◽  
Relative Approximation

AbstractThe article outlines the methods, which has designated Young’s Modulus and Poisson’s Ratio of deformable cement adhesives. These indicators are necessary for the strength calculation of the lightweight floor systems (LFS), that do not require screeds with and without heating, using the finite element method. It was noticed that the diagrams of the dependence the stress on deformation in deformable cement adhesives are similar to the model of the ‘Madrid parabola’ used in testing concrete and cement mortar. In order to determine that the theory of ‘Madrid parabola’ is correct, calculations were performed using the least amount of squares approximation method. The data of the experimental studies combined with the formula calculations, allowed the study to achieve a reliable result, together to determine whether the theory of relative approximation is correct or not. All these actions have allowed determining the smallest deformations εc2 in deformable cement adhesives type C2S1 and C2S2 and their compressive strength. Thanks, these two methods (experimental and calculation) the functions describing deformable cement adhesives are defined. They were named S1 and S2 Evola and can be used by designers and producers of floor systems that do not require screeds.

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