Plastometric Testing of Rheological Properties of 5083 and 5754 Aluminium Alloy

2016 ◽  
Vol 682 ◽  
pp. 362-366
Author(s):  
Sylwester Sawicki ◽  
Anna Kawałek ◽  
Konrad Laber ◽  
Henryk Dyja ◽  
Jacek Borowski ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Rheological Properties ◽  
Inverse Method ◽  
Numerical Models ◽  
Strain Rate Range ◽  
Digital Filtration ◽  
Deformation Parameters ◽  
The Subject ◽  
Mathematical Processing ◽  
Metallurgical Processes

The paper present a method for determining the real steel work-hardening curves based on the cylindrical specimen compression test. The subject of testing were 5083 and 5754 aluminium alloy. The tests were carried out using the physical simulator of metallurgical processes GLEEBLE 3800 (Figure 1a) for the temperature range of 400 ÷ 560 °C and the strain rate range of 0,1 - 1,0s-1. Based on plastic deformation parameters recorded during the experiment, mathematical processing, that is the digital filtration and approximation of the obtained testing results, will be performed. Then, using the inverse method, the actual values of the coefficients of the numerical models for the rheological properties of the tested materials will be determined.

scholarly journals Aluminium Alloy Foam Modelling and Prediction of Elastic Properties Using X-ray Microcomputed Tomography

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 925
Author(s):  
Diogo Heitor ◽  
Isabel Duarte ◽  
João Dias-de-Oliveira
Keyword(s):  
Aluminium Alloy ◽  
Finite Element Modelling ◽  
Effective Properties ◽  
Numerical Models ◽  
Microcomputed Tomography ◽  
Cellular Materials ◽  
Metallic Foams ◽  
X Ray ◽  
The Impact ◽  
Structural Imperfections

X-ray microcomputed tomography has been gaining relevance in the field of cellular materials to characterize materials and analyse their microstructure. So, here, it was used together with finite element modelling to develop numerical models to estimate the effective properties (Young’s modulus) of aluminium alloy foams and evaluate the effects of processing on the results. A manual global thresholding technique using the mass as a quality indicator was used. The models were reconstructed (Marching Cubes 33), then simplified and analysed in terms of mass and shape maintenance (Hausdorff distance algorithm) and face quality. Two simplification procedures were evaluated, with and without small structural imperfections, to evaluate the impact of the procedures on the results. Results demonstrate that the developed procedures are good at minimizing changes in mass and shape of the geometries while providing good face quality, i.e., face aspect ratio. The models are also shown to be able to predict the effective properties of metallic foams in accordance with the findings of other researchers. In addition, the process of obtaining the models and the presence of small structural imperfections were shown to have a great impact on the results.

scholarly journals Design of a Small-Scale Experimental Model of the International Space Station Crew Quarters for a PIV Flow Field Study

2019 ◽  
Vol 111 ◽  
pp. 01045
Author(s):  
Matei-Razvan Georgescu ◽  
Ilinca Nastase ◽  
Amina Meslem ◽  
Mihnea Sandu ◽  
Florin Bode
Keyword(s):  
International Space Station ◽  
Numerical Models ◽  
Space Station ◽  
Scale Model ◽  
Microgravity Environment ◽  
Small Scale ◽  
Piv Measurements ◽  
International Space ◽  
The Subject ◽  
Small Scale Model

An attempt at improving the ventilation solution for the crew quarters aboard the International Space Station requires a thorough understanding of the flow dynamics in a microgravity environment. An experimental study is required in order to validate the numerical models. As part of this process, a small-scale model was proposed for a detailed study of the velocity field. PIV measurements in water offer high quality results and were chosen for the subject. Following certain similitude criteria, an equivalence can be found between the results of these measurements and the real ventilation scenario. This paper describes the development process of this small-scale model as well as its performance in the initial test runs. Details regarding the advantages and weaknesses of this first model are the core of the paper, with the intention of aiding researchers in their design of similar models. The conclusion presents future steps and proposed improvements to the model.

A summary review of mechanical properties prediction methods for textile reinforced polymer composites

2005 ◽  
Vol 219 (2) ◽  
pp. 91-109 ◽  
Author(s):  
J J Crookston ◽  
A C Long ◽  
I A Jones
Keyword(s):  
Mechanical Properties ◽  
Detailed Analysis ◽  
Polymer Composites ◽  
Numerical Models ◽  
Textile Composites ◽  
Prediction Methods ◽  
Reinforced Polymer ◽  
Mechanical Properties Prediction ◽  
The Subject

The use of textile reinforcements for polymer composite components has become a common practice due to the favourable material costs and labour requirements compared with traditional unidirectional prepreg composites, and the high stiffness and strength compared with the use of randomly orientated reinforcements. As a result, determination of both elastic properties and failure behaviour of textile composites has been the subject of substantial research in recent years. This paper presents a review of some of the analytical and numerical models pertaining to the mechanics of textile composites which have been published in the literature. Particular consideration is given to the suitability of models for the analysis of non-orthogonal weave structures such as those which have been deformed in shear during component manufacture. The intention of the paper is not to provide a detailed analysis of the underlying mathematics of the models discussed, but rather to provide an overview of the work conducted in order to direct further reading.

Application of Torsion Test for Determination of Rheological Properties of 5019 Aluminium Alloy

2016 ◽  
Vol 682 ◽  
pp. 356-361 ◽  
Author(s):  
Konrad Laber ◽  
Anna Kawałek ◽  
Sylwester Sawicki ◽  
Henryk Dyja ◽  
Jacek Borowski ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mathematical Modelling ◽  
Aluminium Alloy ◽  
Rheological Properties ◽  
Torsion Test ◽  
Hot Torsion ◽  
Hot Torsion Test

The paper presents the results of the study aimed at determination of plasticity of hard-deformed aluminium alloy grade 5019 in terms of parameters characteristic for the process of extrusion. The examinations were carried out in hot torsion test. Using the developed mathematical model of the analyzed alloy the mathematical modelling of torsion test was also performed.

New Materials and Methods for Aircraft Construction

1953 ◽  
Vol 57 (509) ◽  
pp. 277-300 ◽  
Author(s):  
H. J. Pollard
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Structural Members ◽  
New Materials ◽  
Aircraft Structures ◽  
The Subject

About twenty years ago I was invited by the Council to read a paper before the Society, the title suggested being "The Use of Steel in Aircraft Structures." At that time steel, as the material for important parts of main structural members, was giving place to the then new and stronger aluminium alloys, and I decided that the lecture should be on something of growing, and not diminishing, importance; therefore in a paper entitled “ Some Developments in Aircraft Construction ” (March 1934) stiffened sheeted structure in aluminium alloy was chosen as the theme of the subject. The paper was as up-to-date as possible, but it contained no pictures or descriptions of British aeroplane structure of that type because in this country no aeroplanes (except the odd one in which fabric had simply been replaced by aluminium alloy) designed basically in that way had been built.

Why do triangle zones exist? Insights from numerical models

2020 ◽  
Author(s):  
Betti Hegyi ◽  
Zoltan Erdos ◽  
Ritske S. Huismans ◽  
Christoph von Hagke
Keyword(s):  
Numerical Models ◽  
First Order ◽  
Driving Mechanisms ◽  
Triangle Zone ◽  
Kinematic Evolution ◽  
Thrust Belts ◽  
Wide Range ◽  
Tectonic Erosion ◽  
The Subject ◽  
Overburden Strata

<p>Triangle zones in fold and thrust belts are enigmatic structures bound by foreland verging thrust zones and back-thrusts verging towards the hinterland. The geometry as well as kinematic evolution of these structures has been the subject of a wide range of studies over the last few decades. The understanding of triangle zone mechanics is incomplete although different driving mechanisms for their formation have been proposed. So far few – mostly analogue – modeling studies have focused on understanding the primary factors controlling their formation. Factors suggested to have a first order control on the formation of triangle zones include the rheological properties of the detachment and overburden rocks, the thickness of the overburden rocks, syn-tectonic erosion and sedimentation rate, fluid over-pressure conditions, and the angle of the detachment. Here we use the arbitrary Lagrangian-Eularian finite element code FANTOM to examine the development of triangle zones. We focus especially on the effect of the angle and rheology of the detachment, the rheology of the overburden strata, and syn-tectonic deposition. </p>

scholarly journals Geogrid pull-out modelling using DEM

2019 ◽  
Vol 92 ◽  
pp. 13015
Author(s):  
Marcus Guadagnin Moravia ◽  
Pascal Villard ◽  
Delma De Mattos Vidal
Keyword(s):  
Numerical Models ◽  
Numerical Approach ◽  
Soil Reinforcement ◽  
Contact Points ◽  
Pull Out ◽  
The Subject ◽  
Physical Laws ◽  
Interaction Problem ◽  
Research Centres ◽  
Reinforcement Interaction

With the advancement of the use of synthetic reinforcements in geotechnics, a greater understanding of the mechanisms involved in soil-reinforcement interaction is the focus of major research centres on the subject. The topic of this study is the shearing behaviour at interfaces between granular materials and geogrids. The main objective is to provide a more fundamental understanding of some micromechanisms present in this type of interface, which in turn are important to optimize the design of such reinforcement. The numerical modelling of these reinforced structures must deal with the complexity of the material-reinforcement interaction problem; therefore, it requires specific numerical models whose formulations admit localized behaviours in the contacts as well as the granular nature of the material (e.g., soil, gravel, ballast). A robust and flexible way of modelling this problem is through the Discrete Element Method (DEM). The DEM proposes to model this granular nature by representing the soil as interacting constituent particles, whose behaviour is ruled by physical laws defined at the contact points. The numerical approach is desirable since it allows, in an articulated and relatively fast way, studying closely different regions of the interface, in order to identify factors and variables that are important for the problem. The purpose involves the DEM for a 3D modelling of a geogrid pull-out test to calculate the magnitude of forces in different elements of the geogrid (i.e., nodes, longitudinal and transverse members). Preparation of numerical samples has a particular importance in the final results of simulations. Thus, the numerical techniques used to obtain better geometry for the geogrid and a granular assembly with a representative grain rolling effect are also presented in this paper.

Rheological Properties of Asbestos Waste Filler-Based Epoxy Composite Materials

2017 ◽  
Vol 737 ◽  
pp. 231-235
Author(s):  
M.A. Gavrilov ◽  
O.V. Tarakanov
Keyword(s):  
Composite Materials ◽  
Rheological Properties ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Test Results ◽  
Natural Mineral ◽  
Technological Factors ◽  
Mineral Material ◽  
Mathematical Processing ◽  
Degree Of Filling

Buildings and structures susceptible to aggressive environmental and industrial factors are often protected by composite materials. The latter most notably include polymer-based composites. The rheological properties of filled epoxy composites with fillers based on construction and chemical industries’ waste, as well as composites based on natural mineral material, have been researched and accessed. Optimal degrees of filling for such composites have been determined. Border values of filling have also been determined. Authors attempt to determine the dependencies of rheological properties upon the degree of filling and technological factors. The microstructure of epoxy composite materials has also been taken into consideration. The specific features of deformability processes in of epoxy composite materials have been predicted. The mathematical processing of test results has been carried out.

scholarly journals Influence of indentation test factors on the mechanical response of the skin

2019 ◽  
Vol 24 (1) ◽  
pp. 49-72 ◽  
Author(s):  
Jesica Andrea Isaza ◽  
Damien Lacroix ◽  
Juan Ramírez
Keyword(s):  
Constitutive Equations ◽  
Inverse Method ◽  
Muscle Activation ◽  
Mechanical Response ◽  
Numerical Models ◽  
Indentation Test ◽  
Experimental Conditions ◽  
Indentation Tests ◽  
Pump Pressure

This study proposes in vivo tests and design of experiments to determine the influence of experimental factors on the mechanical response of the soft tissue. The experimental factors considered are: room temperature (A), indentation velocity (B), indenter temperature (C), pump pressure (D) and muscle activation (E). An inverse method was developed to obtain the constants for constitutive equations of a multilayer biological model (skin, hypodermis, and muscle) through the use of indentation tests in combination with a finite element method. For each combination of the experimental factors, two groups of constants were established from the inverse method. Sixteen combinations of experimental conditions and their corresponding constants for the Mooney-Rivlin constitutive equations were obtained to be used in further numerical models. The factor D and factor interactions ADE, CDE, and ACDE were statistically significant with respect to skin mechanical response. Therefore, it can be concluded that there is not a current equation able to represent the mechanical properties of the skin under all the experimental conditions considered in this study.

Effect of epoxidation and nanoparticle addition on the rheological and tribological properties of canola oil

2021 ◽  
pp. 135065012110161
Author(s):  
Gourav Gupta ◽  
Mir Irfan Ul Haq ◽  
Ankush Raina ◽  
Wani K Shafi
Keyword(s):  
Aluminium Alloy ◽  
Rheological Properties ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Canola Oil ◽  
Molybdenum Disulphide ◽  
Tungsten Disulphide ◽  
Pin On Disc ◽  
Lubricating Properties ◽  
And Tungsten

The paper investigates the lubricating properties of epoxidised canola oil. The epoxidation is carried out to decrease the unsaturated bonds present in canola oil. Further, metal dichalcogenide nanoparticles (molybdenum disulphide and tungsten disulphide) are mixed in modified canola oil and their effect on rheological and tribological properties is evaluated. The tribological investigation is carried out on a pin-on-disc tribometer with aluminium alloy and steel as tribopairs. The rheological properties of nanofluids have been studied. It is observed that the modification of the canola oil improves the tribological properties of virgin canola oil. The addition of nanoparticles into the modified canola increases the viscosity of the oil with a 1 wt% concentration of nanoparticles. Further, enhancement in the tribological properties is observed with the addition of nanoparticles. A maximum of 54.6% and 30% decrease in coefficient of friction is observed with the use of tungsten disulphide and molybdenum disulphide nanoparticles, respectively.

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