Study of the Thermal-Structural Behavior of a Piston Diesel With Gallery Through Finite Element Method

2012 ◽  
Author(s):  
José Manuel Avila Aguilar ◽  
Raul Lesso Arroyo ◽  
Jorge Martínez Cruz
Keyword(s):  
Finite Element ◽  
Heat Flow ◽  
Interaction Analysis ◽  
The Body ◽  
Field Analysis ◽  
Element Analysis ◽  
Finite Element Software ◽  
Piston Head ◽  
The Finite Element Analysis

The finite element analysis is a useful tool to investigate the behavior of a body subjected to different loads. The objective of this work was the analysis of an aluminum diesel piston provided with a cooling gallery, Cu-Zn bushings, and a Ni-resist insert. This piston is used in 1.9 L turbodiesel engines. The investigation was undertaken in order to observe the mechanical behavior of the piston at the operating temperatures and pressures and thus to study the performance of the different parts of the piston. The analysis was performed using a finite element software, taking into account a coupled field analysis and involving a fluid passing through the cooling gallery, temperature and pressure at the piston head which resulted in heat flow and thermo-mechanical stresses in the piston. According to the obtained results, it is worth noting the important role of Cu-Zn bushings in the piston as they support the highest stress of about 359 MPa and protect the piston against failure, and these bushings are able to support more stress that the body of the piston (aluminum yield stress limit 290 MPa). Also it is observed that the cooling gallery acts as a thermal barrier by preventing the heat flow from the head piston (approximately 213 ° C) toward the piston body (approximately 80 ° C). Another important aspect is the structural thermal interaction analysis and it can be observed the influence of high temperatures in the piston, increasing stress up to 100%. Finally it was concluded that the piston is able to withstand the operating pressures and temperatures.

Finite element analysis of hydrogen effects on superelastic NiTi shape memory alloys: Orthodontic application

2018 ◽  
Vol 29 (16) ◽  
pp. 3188-3198 ◽  
Author(s):  
Wissem Elkhal Letaief ◽  
Aroua Fathallah ◽  
Tarek Hassine ◽  
Fehmi Gamaoun
Keyword(s):  
Finite Element ◽  
Coupled Model ◽  
Element Model ◽  
Orthodontic Wires ◽  
Niti Wire ◽  
Element Analysis ◽  
Finite Element Software ◽  
Orthodontic Wire ◽  
Niti Shape Memory Alloys

Thanks to its greater flexibility and biocompatibility with human tissue, superelastic NiTi alloys have taken an important part in the market of orthodontic wires. However, wire fractures and superelasticity losses are notified after a few months from being fixed in the teeth. This behavior is due to the hydrogen presence in the oral cavity, which brittles the NiTi arch wire. In this article, a diffusion-mechanical coupled model is presented while considering the hydrogen influences on the NiTi superelasticity. The model is integrated in ABAQUS finite element software via a UMAT subroutine. Additionally, a finite element model of a deflected orthodontic NiTi wire within three teeth brackets is simulated in the presence of hydrogen. The numerical results demonstrate that the force applied to the tooth drops with respect to the increase in the hydrogen amount. This behavior is attributed to the expansion of the NiTi structure after absorbing hydrogen. In addition, it is shown that hydrogen induces a loss of superelasticity. Hence, it attenuates the role of the orthodontic wire on the correction tooth malposition.

Stochastic Methods Applied to Structural Mechanics

2018 ◽  
pp. 199-220
Author(s):  
Siham Ouhimmou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Global Optimization ◽  
Transformation Method ◽  
Stochastic Methods ◽  
Element Analysis ◽  
Local Method ◽  
Structural Problem ◽  
Finite Element Software ◽  
The Finite Element Analysis

Uncertainty modelling with random variables motivates the adoption of advanced PTM for reliability analysis to solve problems of mechanical systems. Probabilistic transformation method (PTM) is readily applicable when the function between the input and the output of the system is explicit. When these functions are implicit, a technique is proposed that combines finite element analysis (FEA) and probabilistic transformation method (PTM) that is based on the numerical simulations of the finite element analysis (FEA) and the probabilistic transformation method (PTM) using an interface between finite element software and Matlab. Structure problems are treated with the proposed technique, and the obtained results are compared to those obtained by the reference Monte Carlo method. A second aim of this work is to develop an algorithm of global optimization using the local method SQP. The proposed approach MSQP is tested on test functions comparing with other methods, and it is used to resolve a structural problem under reliability constraints.

Numerical Evaluation of the Active Earth Pressure Acting on Rigid Retaining Walls

2012 ◽  
Vol 204-208 ◽  
pp. 410-413
Author(s):  
Shi Lun Feng ◽  
Jun Li ◽  
Pu Lin Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Maximum Error ◽  
Active Earth Pressure ◽  
Element Analysis ◽  
Finite Element Software ◽  
Strain Behaviour ◽  
The Finite Element Analysis

The active earth pressure on rigid retaining wall is analyzed using the finite element software ABAQUS. The fill behind the wall is sand and the Mohr–Coulomb constitutive model was used to model the stress–strain behaviour of soils.The finite element analysis results were compared with the Rankine results. The maximum error of the results is about 10% and the finite element analysis result is bigger. So the result obtained from the finite element method could safely be used in actual projects.

Stress Distribution Behavior of Spherical Plain Bearing Fabricated by TiAl-Based Composite Materials Based on the Finite Element Analysis

2014 ◽  
Vol 1061-1062 ◽  
pp. 649-652
Author(s):  
Jing Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Guang Ji Xue ◽  
Chang Xiu Zhou
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Composite Materials ◽  
Bearing Steel ◽  
Plain Bearing ◽  
Element Analysis ◽  
Specific Strength ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Spherical Plain Bearing

Spherical plain bearing is a sliding bearing have a spherical contact surface,it can bear larger load and automatically adjusted to the self-alignin. TiAl-based composite material is a material that be used to lightweight spherical plain bearing. The Simulation used the finite element software Ansys for the bearing’s static analysis.The material of outer ring using normal bearing steel, one group used the TiAl-based composite materials as the material of the inner ring, Another group the inner ring material is bearing steel 9Cr18. The law of the stress and strain produced by the two groups is consistent,the deformation of the composite materials is bigger under the same load, its elasticity modulus and density is smaller compared to the ordinary bearing steel,the composite material has the advantages of high specific strength especially in the occasions have strict requirements of the bearing weight.

The Finite Element Analysis on Axial Tensile Bearing Capacity of Round Steel-Tubes Reinforced with CFRP Sheets

2011 ◽  
Vol 368-373 ◽  
pp. 1595-1599
Author(s):  
Xiu Li Wang ◽  
Jun Jie Li
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Large Scale ◽  
Steel Tubes ◽  
Element Analysis ◽  
Cfrp Sheets ◽  
Finite Element Software ◽  
Axial Tensile ◽  
The Finite Element Analysis ◽  
Circumferential Reinforcement

The numerical simulation calculation on round steel-tubes reinforced with CFRP sheets was done through the large-scale finite element software ANSYS. In this research, four factors were comparatively analyzed so as to obtain the influence of them on ultimate axial tensile bearing capacity of steel-tubes. These four factors are longitudinal reinforcement length rate , thickness , elastic modulus and circumferential reinforcement ways of CFRP sheets. The results show that the ultimate axial tensile bearing capacity of steel-tubes strengthened with CFRP sheets is enhanced significantly and the reinforcement effect is very good.

ANALYTICAL AND EXPERIMENTAL STUDIES ON 400 kV S/C PORTAL-TYPE GUYED TOWERS

2009 ◽  
Vol 09 (01) ◽  
pp. 85-106
Author(s):  
N. PRASAD RAO ◽  
S. J. MOHAN ◽  
R. P. ROKADE ◽  
R. BALA GOPAL
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Ground Level ◽  
Test Results ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Guyed Towers ◽  
Analytical Behavior

The experimental and analytical behavior of 400 kV S/C portal-type guyed towers under different loading conditions is presented. The portal-type tower essentially consists of two masts extending outward in the transverse direction from the beam level to the ground. In addition, two sets of guys connected at the ground level project outward along the longitudinal axes and converge in the transverse axes. The experimental behavior of the guyed tower is compared with the results of finite element analysis. The 400 kV portal-type guyed towers with III and IVI type insulator strings are analyzed using finite element software. Full scale tower test results are verified through comparison with the results of the finite element analysis. The initial prestress in the guys is allowed to vary from 5% to 15% in the finite element modeling. The effect of prestress variation of the guys on the tower behavior is also studied.

scholarly journals A M-theta Method on Mode I and II Failure of Two Cameroonian Hardwoods in Bending

2019 ◽  
Vol 4 (3) ◽  
pp. 176-182
Author(s):  
Hervice Kouefouet ◽  
Jeanne Sandrine Takam Mabekou ◽  
Joseph Albert Fosting Mukam ◽  
Pierre Kisito Talla ◽  
Rostand Pitti Moutou
Keyword(s):  
Finite Element ◽  
Bending Test ◽  
Mode I ◽  
Pure Mode ◽  
Element Analysis ◽  
Finite Element Software ◽  
Path Independence ◽  
The Finite Element Analysis ◽  
Edge Notch ◽  
Theta Method

This work deals with the numerical simulation on bending test to characterize two Cameroonian hardwoods under mode I and II loading for different crack lengths. The finite element analysis for fracture in orthotropic medium is developed. The algorithm of fracture is introduced in a finite element software Cast3M. According to the Mtheta method, the calculation of the stress intensity factors and the energy release rate for pure mode I and II fracture are deduced using a SENB (Single Edge Notch Bending) specimen. The path independence of Mθ-method on the specimen is confirmed.

Finite Element Analysis for the Temperature and Stress Fields of the Diesel Piston Based on CAE

2012 ◽  
Vol 538-541 ◽  
pp. 815-818
Author(s):  
Wen Fu Sun ◽  
Xiao Bo Li ◽  
Yuan Ju Yu ◽  
Xiao Li Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Load ◽  
Cooling Condition ◽  
Stress Fields ◽  
Element Analysis ◽  
Finite Element Software ◽  
Piston Head ◽  
Analytical Results ◽  
High Thermal Load

Adopting the finite element software ANSYS, this paper calculates the temperature and stress fields of the combined piston under the conditions of cooling and no cooling. The analytical results show that the piston under no cooling condition has higher thermal load and integrative stress than the condition of cooling, because the piston head can’t get better cooling. Moreover, the high thermal load causes the piston head creating great deformation, which has exceeded the normal gap between the piston and the liner, so the piston abrasion may worsen.

Technological Process Optimization of Hot-Machining Numerical Simulation

2013 ◽  
Vol 364 ◽  
pp. 474-477
Author(s):  
Yin Ping Huang ◽  
Min Tua Ma ◽  
Fu Ping Ning ◽  
Rui Fen Chen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Casting Process ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Software ◽  
Analysis Process ◽  
The Finite Element Analysis ◽  
Hot Machining ◽  
Analysis System

Applying the CAD/CAE method and the finite element analysis system, It was the research of the optimization technology about diesel body of the ship in the casting process in the paper. There are the functions of finite element software and application method in the paper, too. The analysis method can forecast the castings defects and advance the quality control. Applying the HyperMesh module of finite element software, we can cut the optimization period and realize the flow restructure analysis process to large-scaled complex castings.

The Finite Element Analysis Concerning the Slip Coat of Workover Rig

2013 ◽  
Vol 483 ◽  
pp. 297-300
Author(s):  
Jia Qi Jin ◽  
Ye Yuan ◽  
Xian Rong Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Static Analysis ◽  
Allowable Stress ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Lifting System

Based on the finite element analysis of the slip coat in the compulsory lifting system of hyper-thermal snubbing operation injected by steam, the static analysis with regard to the slip coat is undoubtedly employed taking advantage of the finite element software. And then, the failure forms are deduced and the maximum allowable stress is calculated by analyzing the stress distribution.

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