scholarly journals Finite Element-Based Simulation of Cooling Rate on the Material Properties of an Automobile Silent Block

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Burak Öztürk ◽  
Fuat Kara
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Cooling Rate ◽  
Material Properties ◽  
High Speed ◽  
Tensile Tests ◽  
Isothermal Transformation ◽  
Element Analysis ◽  
Front Suspension ◽  
Safety Coefficient

The aluminum silent block is the part that connects the front suspension mounting and the road wheels. These products are used in high-speed cars and are subject to high engineering stresses. Over time, fractures occur in the connection part of these products due to insufficient strength. These problems are related to production metallurgy, which led to the concept of this study. During mass production, these parts are manufactured using the aluminum extrusion method. In this study, a rapid cooling process using water was applied, with the aim of improving the mechanical properties of the connecting part exposed to high dynamic loads. Samples were taken from the regions of these products which differed in thickness and width, and microhardness and tensile tests were performed for each region. The effects of both the extrusion cooling rate and the regional flash cooling on the material properties were then characterized. As a result of the isothermal transformation, the grain size in the microstructure of the material had shrunk. According to the findings, in this type of production, an average increase in strength of 25% was observed in the parts of the material subjected to maximum stress. The stress and safety coefficient values were found using finite element analysis, and curves were then drawn showing the differences in the safety coefficient values from the different points. As a result of cooperation between university and industry, the material and mechanical properties of an automobile part were improved in this study. This research has shown that, in terms of the accuracy of the results, it is very important to consider the variations in different regions of the product when defining the mechanical properties of any material produced by applying casting, heat treatment, and plastic forming methods.

Damage Length Predictor for High-Speed Craft

1999 ◽  
Vol 36 (04) ◽  
pp. 203-210
Author(s):  
Steven P. McGee ◽  
Armin Troesch ◽  
Nickolas Vlahopoulos
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Properties ◽  
High Speed ◽  
Historical Data ◽  
Element Analysis ◽  
Damage Prediction ◽  
Structural Layout ◽  
Vessel Speed ◽  
Indenter Geometry

In 1994 the International Maritime Organization adopted the Code of Safety for High-Speed Craft (HSC Code). After two years of use, several shortfalls were found, one being the damage length predictor, which is based on traditional steel, mono-hulled vessels. Other damage predictors were developed based on historical data, but they do not account for variables such as aluminum or fiberglass construction, transverse members, indenter geometry variation, or for the case where the vessel comes to rest on the grounding object. This paper proposes a damage prediction model based on material properties, structural layout, grounding object geometry, and vessel speed. The model incorporates four grounding mechanisms: plate cutting, plate tearing, crushing of plate behind transverse members, and transverse member failure. The method is used to determine the resistance energy, compared to the kinetic energy, of the vessel, to determine an effective damage length. Finite-element analysis was used to model the failure of both aluminum and steel transverse members with significant differences in the results. It was found that the transverse members provided the majority of the resistance energy in one grounding mechanism and negligible resistance energy in another.

scholarly journals Finite element analysis relating shape, material properties, and dimensions of taenioglossan radular teeth with trophic specialisations in Paludomidae (Gastropoda)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wencke Krings ◽  
Jordi Marcé-Nogué ◽  
Stanislav N. Gorb
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Material Properties ◽  
Stress And Strain ◽  
Plant Surface ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Force Volume ◽  
General Size

AbstractThe radula, a chitinous membrane with embedded tooth rows, is the molluscan autapomorphy for feeding. The morphologies, arrangements and mechanical properties of teeth can vary between taxa, which is usually interpreted as adaptation to food. In previous studies, we proposed about trophic and other functional specialisations in taenioglossan radulae from species of African paludomid gastropods. These were based on the analysis of shape, material properties, force-resistance, and the mechanical behaviour of teeth, when interacting with an obstacle. The latter was previously simulated for one species (Spekia zonata) by the finite-element-analysis (FEA) and, for more species, observed in experiments. In the here presented work we test the previous hypotheses by applying the FEA on 3D modelled radulae, with incorporated material properties, from three additional paludomid species. These species forage either on algae attached to rocks (Lavigeria grandis), covering sand (Cleopatra johnstoni), or attached to plant surface and covering sand (Bridouxia grandidieriana). Since the analysed radulae vary greatly in their general size (e.g. width) and size of teeth between species, we additionally aimed at relating the simulated stress and strain distributions with the tooth sizes by altering the force/volume. For this purpose, we also included S. zonata again in the present study. Our FEA results show that smaller radulae are more affected by stress and strain than larger ones, when each tooth is loaded with the same force. However, the results are not fully in congruence with results from the previous breaking stress experiments, indicating that besides the parameter size, more mechanisms leading to reduced stress/strain must be present in radulae.

Impact of Grain Structure and Material Properties on Via Extrusion in 3D Interconnects

2015 ◽  
Vol 12 (3) ◽  
pp. 118-122 ◽  
Author(s):  
Tengfei Jiang ◽  
Chenglin Wu ◽  
Jay Im ◽  
Rui Huang ◽  
Paul S. Ho
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Grain Size ◽  
Finite Element ◽  
Analytical Model ◽  
Material Properties ◽  
Grain Structure ◽  
Element Analysis ◽  
Silicon Vias ◽  
The Relationship

In this article, the effects of Cu microstructure on the mechanical properties and extrusion of through-silicon vias (TSVs) were studied based on two types of TSVs with different microstructure. A direct correlation was found between the grain size and the mechanical properties of the vias. Both an analytical model and finite element analysis (FEA) were used to establish the relationship between the mechanical properties and via extrusion. The effect of via/Si interface on extrusion was also studied by FEA. The results suggest small and uniform grains in the Cu vias, as well as stronger interfaces between the via and Si led to smaller via extrusion, and are thus preferable for reduced via extrusion failure and improved TSV reliability.

scholarly journals Finite Element Analysis Relating Shape, Material Properties, and Dimensions of Taenioglossan Radular Teeth with Trophic Specialisations in Paludomidae (Gastropoda)

2021 ◽  
Author(s):  
Wencke Krings ◽  
Jordi Marcé-Nogué ◽  
Stanislav N. Gorb
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behaviour ◽  
Material Properties ◽  
Stress And Strain ◽  
Plant Surface ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Force Volume

Abstract The radula, a chitinous membrane with embedded tooth rows, is the molluscan autapomorphy for feeding. The morphologies, arrangements and mechanical properties of teeth can vary between taxa, which is usually interpreted as adaptation to food. In previous studies, we proposed about trophic and other functional specialisations in taenioglossan radulae from species of African paludomid gastropods. These were based on the analysis of shape, material properties, force-resistance, and the mechanical behaviour of teeth, when interacting with an obstacle, which was previously simulated for one species (Spekia) by the finite-element-analysis (FEA) and, for more species, observed in experiments. In the here presented work, we test the previous hypotheses by applying the FEA on 3D modelled radulae, with incorporated material properties, from three additional paludomid species. These species forage either on algae attached to rocks (Lavigeria), covering sand (Cleopatra), or attached to plant surface and covering sand (Bridouxia). Since the analysed radulae vary greatly in their size between species, we additionally aimed at relating the simulated stress and strain distributions with the tooth sizes by altering the force/volume. For this purpose, we also included Spekia again in the present study. Our FEA results show that smaller radulae are more affected by stress and strain than larger ones, when each tooth is loaded with the same force. However, the results are not fully in congruence with results from the previous breaking stress experiments, indicating that besides the parameter size, more mechanisms leading to reduced stress/strain must be present in radulae.

scholarly journals A novel technique for the assessment of mechanical properties of vascular tissue

2020 ◽  
Vol 19 (5) ◽  
pp. 1585-1594 ◽  
Author(s):  
Stefan N. Sanders ◽  
Richard G. P. Lopata ◽  
Lambert C. A. van Breemen ◽  
Frans N. van de Vosse ◽  
Marcel C. M. Rutten
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
High Speed ◽  
Vascular Tissue ◽  
Plaque Rupture ◽  
Tensile Tests ◽  
Accurate Estimation ◽  
Uniaxial Tensile ◽  
Inflation Experiment ◽  
Set Up

Abstract Accurate estimation of mechanical properties of the different atherosclerotic plaque constituents is important in assessing plaque rupture risk. The aim of this study was to develop an experimental set-up to assess material properties of vascular tissue, while applying physiological loading and being able to capture heterogeneity. To do so, a ring-inflation experimental set-up was developed in which a transverse slice of an artery was loaded in the radial direction, while the displacement was estimated from images recorded by a high-speed video camera. The performance of the set-up was evaluated using seven rubber samples and validated with uniaxial tensile tests. For four healthy porcine carotid arteries, material properties were estimated using ultrasound strain imaging in whole-vessel-inflation experiments and compared to the properties estimated with the ring-inflation experiment. A 1D axisymmetric finite element model was used to estimate the material parameters from the measured pressures and diameters, using a neo-Hookean and Holzapfel–Gasser–Ogden material model for the rubber and porcine samples, respectively. Reproducible results were obtained with the ring-inflation experiment for both rubber and porcine samples. Similar mean stiffness values were found in the ring-inflation and tensile tests for the rubber samples as 202 kPa and 206 kPa, respectively. Comparable results were obtained in vessel-inflation experiments using ultrasound and the proposed ring-inflation experiment. This inflation set-up is suitable for the assessment of material properties of healthy vascular tissue in vitro. It could also be used as part of a method for the assessment of heterogeneous material properties, such as in atherosclerotic plaques.

Discretization Errors of Random Fields in Finite Element Analysis

2014 ◽  
Vol 553 ◽  
pp. 405-409 ◽  
Author(s):  
J. Huang ◽  
D.V. Griffiths ◽  
Andrei V. Lyamin ◽  
Kristian Krabbenhoft ◽  
Scott William Sloan
Keyword(s):  
Field Theory ◽  
Mechanical Properties ◽  
Finite Element ◽  
Material Properties ◽  
Random Fields ◽  
Element Analysis ◽  
Element Mesh ◽  
Random Field Theory ◽  
Correlation Lengths ◽  
Discretization Errors

The mechanical properties of natural materials such as rocks and soils vary spatially. This randomness is usually modelled by random field theory so that the material properties can be specified at each point in space. When these point-wise material properties are mapped onto a finite element mesh, discretization errors are inevitable. In this study, the discretization errors are studied and suggestions for element sizes in relation with spatial correlation lengths are given.

Finite Element Analysis of Mechanical Behavior of Light-Weight Mobile FRP Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1995-1998
Author(s):  
Xin Huang ◽  
Zai Gen Mu ◽  
Peng Feng
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Material Properties ◽  
Weight Ratio ◽  
High Strength ◽  
Light Weight ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Superior Corrosion Resistance ◽  
Main Material

As composite materials have advantages of high strength-to-weight ratio and superior corrosion resistance properties, it is used in emergencies in the construction of mobile bridges as the preferred material. However, In contrast to traditional steel or aluminum to the movement of the bridge as the main material, the original bridge forms need to be improved in order to reach the full of FRP material properties. In this paper, to study the domestic light-weight mobile FRP Bridge, the finite element method is used to analysis the mechanical properties of bridge.

Mapping the Mechanical Properties of Cancellous Bone from the Femoral Head

2015 ◽  
Vol 801 ◽  
pp. 273-277
Author(s):  
Karla Noemy Kun ◽  
Lorand Kun ◽  
Ramona Nagy ◽  
Karoly Menyhardt ◽  
Dana Silaghi-Perju ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Femoral Head ◽  
Cancellous Bone ◽  
Material Properties ◽  
Compression Testing ◽  
Experimental Program ◽  
Element Analysis

This work presents an experimental program to determine the mechanical properties of cancellous bone in the femoral head as a function of location. To achieve this several specimens of cancellous bone of approximately 10 mm height and 10 mm diameter were obtained from one human femoral head, starting the sampling from its main loading compressive direction. All specimens underwent compression testing in order to determine the mechanical properties of each specimen and thus a properties map of the cancellous bone in the femoral head was obtained. Based on the results a parametric file with material properties was created in order to be used by professionals in finite element analysis programs.

scholarly journals Experimental Research and Simulation on the Mechanical Performance Degradation of Corroded Stud Shear Connectors

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Bing Wang ◽  
Xiaoling Liu ◽  
Jiantao Du
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Corrosion Rate ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Tensile Tests ◽  
Tensile Behavior ◽  
Uniaxial Tensile ◽  
Element Analysis ◽  
Gtn Model

Electrochemical accelerated corrosion and tensile tests were conducted on six series of 30 stud specimens in this study to assess the various mechanical properties in corroded stud connectors. The results indicate that there is a gradual decline in mechanical properties (e.g., yield strength, ultimate strength, and plasticity) as stud corrosion rate increases. Degradation equations for these parameters were established via fitting analysis on the test data. A Gurson–Tvergaard–Needleman (GTN) constitutive model describing the tensile behavior of corroded studs was established based on mesodamage mechanics and finite element analysis. In the GTN model, the corrosion rate equals the original void volume fraction; the trial-and-error method was adopted to determine the relationship between the corrosion rate and material failure parameters. The finite element simulation results are in good agreement with the experimental results. The GTN model accurately simulates the uniaxial tensile behavior of the corroded stud.

Inverse Method to Determine Mechanical Properties of Thin Film by Nanoindentation and Finite Element Analysis

2006 ◽  
Vol 326-328 ◽  
pp. 219-222 ◽  
Author(s):  
Dong Cheon Baek ◽  
Soon Bok Lee
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Young’S Modulus ◽  
Material Properties ◽  
Inverse Method ◽  
Young's Modulus ◽  
Displacement Curve ◽  
Element Analysis

As a reliable tool to measure the Young’s modulus, nanoindention technique has been used widely recently. In this paper, nanoindetation technique was overviewed with its advantage and limitation and a new method was proposed to determine material properties of film, i.e. both Young’s modulus E and Poisson’s ratio ν from load-displacement curve of shallow-depth indentation using ‘inverse method’.

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