Manufacturing technologies of components for the aeronautical industry

The team “Manufacturing Technologies” offers his experience in the research on manufacturing processes for applications in the aeronautical industry. Moreover, The team have developed works on light alloys machining, material damage related with manufacturing process and prediction of surface integrity parameters using numerical simulation. The developments are achieved in a multidisciplinary approach to a problem in the manufacturing of components for the aeronautical industry. Solutions are developed guaranteeing the safety of components. However it is not the unique objective in the aeronautical industry, and it is also focused on cost and productivity. The manufacturing process is developed from a global perspective which includes the mechanical behaviour of the material and technological aspects of the process

Tecnologías de fabricación de componentes para la industria aeronáutica

El grupo "Tecnologías de Fabricación" ofrece su experiencia en la investigación sobre procesos de fabricación para su aplicación al sector aeronáutico. En concreto se tiene experiencia en mecanizado de aleaciones aeronáuticas, estudios de daño en el material debido al proceso de transformación y predicción de parámetros indicativos de integridad superficial mediante simulación. La actividad desarrollada radica en la aproximación multidisciplinar a un posible problema planteado en el marco de la fabricación de componentes para la industria aeronáutica, planteando soluciones en donde prima la seguridad de los componentes pero compatibles con la productividad y coste razonable que ha de tener el proceso. El proceso de fabricación se desarrolla desde una perspectiva global que incluye el comportamiento mecánico del material y los aspectos tecnológicos del proceso

Analysis of adiabatic shear banding in orthogonal cutting of Ti alloy

This work is focused on the numerical analysis of adiabatic shear banding in orthogonal cutting of Ti6Al4V alloy. Segmented chip results from adiabatic shear banding, depending on the competition of thermal softening and strain and strain rate hardening. The influence of cutting velocity and feed in the chip segmentation is studied. Also the role of friction at the tool-chip interface and the effect of rheological parameters of the constitutive equation are analyzed. Experimental tests obtained from previous work of the authors [Molinari A, Musquar C, Sutter G, Adiabatic shear banding in high speed machining of Ti-6Al-4V experiments and modeling, Int J Plast, vol. 18, 2002, p. 443-4591 and others were used as a reference to validate the models. Cutting forces and the mechanism of plastic flow localization are analyzed in terms of frequency of segmentation and shear band width and compared to experimental data.The financial support of this work to the Ministry of Economy and Competitiveness of Spain with the project DPI2011-25999 and to the Universidad Carlos III de Madrid —Banco de Santander for the program "Chair ofExcellence". This work was also supported by the French State through the program “Investmentin the future” operated by the NationalResearch Agency (ANR) and referenced byLabEx DAMAS.Publicad

Las tertulias literarias dialógicas en Educación Infantil

El siguiente Trabajo Fin de Grado se centra en las tertulias literarias dialógicas como actuaciones educativas de éxito basadas en un aprendizaje dialógico a través de una metodología comunicativa crítica, concediendo gran relevancia a las experiencias del alumnado de Educación Infantil como protagonista. De forma sucinta, se contextualizan estas actividades novedosas en la etapa de Educación Infantil y se fundamentan como tales, de forma teórica con el objetivo de crear una propuesta práctica de intervención en el aula de dicha etapa para la animación a la lectura de obras de la literatura clásica universal.Grado en Educación Infanti

Machining FEM model of long fiber composites for aeronautical components

This work is focused on the study of orthogonal cutting of long fiber composites. A model based in finite element was developed. The mechanisms of chip formation of Glass and Carbon Fiber Reinforced Polymer (FRP) composites were analyzed. Significant differences were observed when comparing machining induced damage predicted with the model for both materials. While damage extended widely ahead the interface and beneath the tool tip in the case of GFRP, damage was located in a much smaller zone in the case CFRP. The fiber orientation influences both the mechanism of chip formation and the induced subsurface damage.The authors are indebted for the financial support of this work, to the Ministry of Science and Education of Spain (under Project DPI2008-06746). The authors also acknowledge to the CAMUC3 M for the financial support obtained for this work with the Project CCG08-UC3 M/DPI-4494.Publicad

Out-of-plane failure mechanisms in LFRP composite cutting

LFRP (Long Fiber Reinforced) composites are widely used in structural components for high responsibility applications in different industrial sectors. Composite components are manufactured near final shape, however several machining operations are commonly required to achieve dimensional and assembly specifications. Machining should be carefully carried out in order to avoid workpiece damage. Despite of the interest of numerical modeling to analyze in detail the phenomena involved during composite cut ting, there are only few works in the scientific literature dealing with this topic even in the simple case of orthogonal cutting. Out of plane failure can be accounted only if three dimensional modeling is per formed. However up to date numerical analysis of cutting found in scientific literature was focused in two dimensional approach. In this paper (2D) and three dimensional (3D) numerical modeling of orthog onal cutting of carbon LFRP composite are presented. The aim of the paper is to analyze the complex aspects involved during cutting, including out of plane failure.The authors are indebted for the financial support of this work, to the Ministry of Science and Innovation of Spain (under project DPI2008 06746)Publicad

Computational analysis of temperature effect in composite bolted joints for aeronautical applications

This study focuses on the analysis of influence of temperature and bolt torque on aeronautical joint behavior. A single-lap joint, according to ASTM D5961, with a titanium bolt and composite plates was considered. A numerical model based on FEM was developed to evaluate the stress in both bolt and composite plates. Load–displacement curves, stress fields, and induced damage showed, significantly, the influence of temperature combined with torque level on the joint. It was found that in the plate, both maximum and minimum levels of torque considered produced damage above critical threshold. This fact should be accounted for, during the design process of the joint.This work was supported by Spanish Comisión Interministerial de Ciencia y Tecnología [project TRA2004 03960].Publicad

Analysis of the effect of out-of-phase biaxial fatigue loads on crack paths in cruciform specimens using XFEM

[EN] In the present research work, a numerical crack growth analysis using linear elastic fracture mechanics is carried out paying attention to the crack paths that grow in the central part of cruciform specimens under biaxial fatigue loads. The crack propagation in this type of specimens has been studied using the extended finite element method (XFEM). The objective is to analyse the effect of different phase angles under biaxial fatigue loads and to assess the different orientation criteria for nonproportional loading, benefiting from the advantages of XFEM. The crack path and the stress intensity factor range of a crack either aligned or inclined to the load directions have been investigated using different crack orientation criteria. Symmetrical branching is predicted for an initial crack inclined at 45 degrees with phase angle of loading equal to 90 degrees and 180 degrees. Numerical results are in good agreement with the experimental observations found in the literature, although the study reveals important differences in the crack path predictions depending on the orientation criteria.The authors gratefully acknowledge the financial support given by the Spanish Ministry of Economy and Competitiveness and the FEDER program through the project DPI2017-89197-C2-1-R, DPI2017-89197-C2-2-R and DPI2014-56137-C2-2-11 and the FPI subprogram associated to the project with the reference BES-2015-072070. The support of the Generalitat Valenciana, Programme PROMETEO 2016/007, is also acknowledged. Guian Qian is grateful for the financial support by the National Natural Science Foundation of China (No.11872364).Infante, D.; Qian, G.; Miguélez, MH.; Giner Maravilla, E. (2019). Analysis of the effect of out-of-phase biaxial fatigue loads on crack paths in cruciform specimens using XFEM. International Journal of Fatigue. 123:87-95. https://doi.org/10.1016/j.ijfatigue.2019.01.019S879512

Influence of temperature on composite aeronautical structural bolted joints

15th International Conference on Composite Structures (ICCS/15), University of Porto, Porto, Portugal, 15-17 June 2009This work focuses on the analysis of temperature and bolt torque influence on aeronautical joint behaviour. A numerical model based on finite elements was developed. Results obtained from numerical simulations showed coupled influence of temperature combined with torque level on the jointPublicad

Development of software for easy prediction of process parameters in air bending with local heating

This paper presents a new software tool for sheet metal forming, based on an analytical model of the process. The advantages of this kind of tool, compared with numerical models based on finite element codes, are described. The analysis is focused on sheet metal bending at high temperature that is a promising method for metal forming, improving sheet formability and machines range of use.Publicad