A Proposal of a Constitutive Description for Aluminium Alloys in Both Cold and Hot Working

Severe plastic deformation (SPD) processes have attracted a great deal of both scientific and technological interest over the last few years as a consequence of the improvements that are possible to obtain in the microstructure and mechanical properties of the materials manufactured through the use of these kind of processes. However, the practical applications of such materials to obtain mechanical components are significantly fewer. As a direct consequence, the same thing has been observed in the development of studies that show the in-service behaviour of the mechanical components developed in this way. Since one of the industrial objectives of these SPD processes is to obtain functional parts, it is necessary to carry out studies to fill this gap. Therefore, in this study, an analysis of the wear that cams undergo when manufactured from an AA5083 aluminium-magnesium alloy is carried out. The cams were isothermally-forged from materials with and without previous SPD processing by equal channel angular pressing (ECAP). Subsequently, the wear behaviour of these cams was analysed by using specific equipment, which may have been considered to have a block-on-ring configuration, developed for testing in-service wear behaviour of mechanical parts. From this comparative wear study with cams, it is shown that previously-processed materials by ECAP have a better wear performance. Moreover, finite element modelling (FEM) simulations were also included to predict wear in the cams processed in this way. A good agreement between FEM and experimental results was obtained. It is this aspect of performing the wear tests on functional and real mechanical components, and not on laboratory samples, which makes this present research work novel.

Section: Set-up Of the Experimentsmentioning

confidence: 87%

Experimental and FEM Analysis of Wear Behaviour in AA5083 Ultrafine-Grained Cams

Pérez

Irigoyen

Fuertes

et al. 2020

“…Furthermore, a comparative study is made between the experimental results and the FEM simulations. For the FEM simulations, flow rules of N0 and N2F initial materials are used, where these are obtained from isothermal compression tests and by the application of a new constitutive model developed by these present authors [26].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Design and Mechanical Properties Analysis of AA5083 Ultrafine Grained Cams

Salcedo

Luis

Luri

et al. 2017

Self Cite

This present research work deals with the development of ultrafine grained cams obtained from previously ECAP (Equal Channel Angular Pressing)-processed material and manufactured by isothermal forging. The design and the manufacturing of the dies required for the isothermal forging of the cams are shown. Optimization techniques based on the combination of design of experiments, finite element and finite volume simulations are employed to develop the dies. A comparison is made between the mechanical properties obtained with the cams manufactured from material with no previous deformation and with those from previously SPD (Severe Plastic Deformation)-processed material. In addition, a comparative study between the experimental results and those obtained from the simulations is carried out. It has been demonstrated that it is possible to obtain ultrafine grained cams with an increase of 10.3% in the microhardness mean value as compared to that obtained from material with no previous deformation.

“…The flow rule proposed by [30] is assigned to the material in order to consider this predeformed state of the AA5083. This flow stress is shown in Equation (1), whose main parameters are defined in [30]. The ECAPed material was processed by using a press with a set of ECAP dies with a channel diameter of 20 mm and an intersection angle between the two channels of 90 • .…”

Section: Finite Element Modelling (Fem) Simulationsmentioning

confidence: 99%

“…The preform of the connecting rod is isothermally forged at a temperature of 200 • C and the material used in the FEM simulations is a 5083 aluminium alloy in a predeformed state through two ECAP passages with route C (N2). The flow rule proposed by [30] is assigned to the material in order to consider this predeformed state of the AA5083. This flow stress is shown in Equation (1), whose main parameters are defined in [30].…”

Section: Finite Element Modelling (Fem) Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Fatigue and Wear Behaviour in Ultrafine Grained Connecting Rods

Luri

Luis

León

et al. 2017

Self Cite

Abstract:Over the last few years there has been an increasing interest in the study and development of processes that make it possible to obtain ultra-fine grained materials. Although there exists a large number of published works related to the improvement of the mechanical properties in these materials, there are only a few studies that analyse their in-service behaviour (fatigue and wear). In order to bridge the gap, in this present work, the fatigue and wear results obtained for connecting rods manufactured by using two different aluminium alloys (AA5754 and AA5083) previously deformed by severe plastic deformation (SPD), using Equal Channel Angular Pressing (ECAP), in order to obtain the ultrafine grain size in the processed materials are shown. For both aluminium alloys, two initial states were studied: annealed and ECAPed. The connecting rods were manufactured from the previously processed materials by using isothermal forging. Fatigue and wear experiments were carried out in order to characterize the in-service behaviour of the components. A comparative study of the results was made for both initial states of the materials. Furthermore, Finite Element Modelling (FEM) simulations were used in order to compare experimental results with those obtained from simulations. In addition, dimensional wear coefficients were found for each of the aluminium alloys and initial deformation states. This research work aims to progress the knowledge of the behaviour of components manufactured from ultrafine grain materials.