Implementación de una metodología de prácticas que combina el aprendizaje cooperativo con el individualista y su posterior evaluación. [Implementation of a methodology for the practical teaching activities that combines cooperative and individualist learning and its evaluation]

En este trabajo se presentan una metodología para la realización de las sesiones prácticas que combina aprendizaje cooperativo con el aprendizaje individualista, y la evaluación de la experiencia por parte de los estudiantes. La metodología se ha implementado en las asignaturas Resistencia de Materiales y Estructuras en distintos grados de Ingeniería y Arquitectura. Los estudiantes han valorado positivamente el sistema de prácticas con una puntuación superior a 3.5 de una escala de 1 a 5. La encuesta también ha servido para detectar dos problemas que presenta el método actual. En el documento se presentan las soluciones que van a adoptarse para mejorar la metodología en los próximos cursos. [In this work, a methodology to carry out the practical sessions, which combines cooperative and individualist learning, and the evaluation of this experience by the participant students are presented. The methodology has been implemented in the courses of Strength of Materials and Structures in degrees of Engineering and Architecture. The evaluation from the students has been positive with an average value of above 3.5 over an scale between 1 and 5. The survey has also been useful to detect the problems of the current methodology. The solutions that will be adopted in the subsequent courses to overcome these problems are also presented in this work.

Adhesive thickness influence on a structural methacrylate adhesive behavior

Structural adhesive bonding importance has been growing steadily in the last decades as transport sector’s current problematic is to there products’ reduce mass. In addition, compared to riveting and welding, adhesive bonding offers better properties when joining dissimilar materials such as metals and composites which are a pair used more and more frequently. However, adhesive bonding suffers great-ly from a lack of confidence from industries as validating the bond quality need either destructive testing or long and costly nondestructive testing. Both these solutions can hardly be implemented at an industrial level. Nevertheless, with the implementation of robotics it is possible to auto-mate and control the entire bonding processes. In this con-text a collaborative project called S3PAC (Système de Supervision et de Simulation de la Production d’Assemblage par Collage) has been launched in order to offer a fully supervised and automated industrial bonding process

A simulation method for fatigue-driven delamination in layered structures involving non-negligible fracture process zones and arbitrarily shaped crack fronts

Most of the existing methods for fatigue-driven delamination are limited to two-dimensional (2D) applications or their predictive capabilities have not been validated in three-dimensional (3D) problems. This work presents a new cohesive zone-based computational method for simulating fatigue-driven delamination in the analysis of 3D structures without crack migration. The method accurately predicts fatigue propagation of non-nelgigible fracture process zones with arbitrarily shaped delamination fronts. The model does not require any kind of fitting parameter since all the input parameters are obtained experimentally from coupon tests. The evaluation of the energy release rate is done using two new techniques recently developed by the authors (the growth driving direction and the mode-decomposed J-integral) leading to an accurate prediction of delamination propagation under mixed-mode and non-self-similar growing conditions. The new method has been implemented as a UEL for Abaqus and validated against an experimental benchmark case with varying crack growth rate and shape and extension of the fracture process zone.Comment: 37 pages, 14 figures, 7 table

Thickness influence on a structural methacrylate adhesive behavior

Thickness influence on a structural methacrylate adhesive behavior