Consistency of stress smooting by convolution

Conference (2001, March)

A convolution process is presented in order to smoothen finite element stresses. A comprehensive analysis leads to the fact that a pertinent choice of the convolution kernel has to be done, as consistency ... [more ▼]

A convolution process is presented in order to smoothen finite element stresses. A comprehensive analysis leads to the fact that a pertinent choice of the convolution kernel has to be done, as consistency conditions have to be satisfied. Such kernels are then presented. [less ▲]

Expertise relative à l'affaire Duchâteau Révisions/Baiamonte

Report (2001)

le fabricant de ressorts Baiamonte a commandé à Duchâteau-Révisions une machine à bobiner les ressorts. Il en conteste le bon fonctionnement.

QUESTIONS SPECIALES DE TECHNOLOGIE

Book published by DEBONGNIE (JEAN-FRANCOIS) (2001)

Analytical solutions of the rigid-plastic model to forming processes

Revisiting early works of the aerospace laboratory of Liège. Dual analysis, 60's and 70's

in Nguyen-Dang, Hung; Ronday, François; Nguyen, Van Diep (Eds.) Proceeding of the International colloquium in mechanics of solids, fluids, structures and interactions (2000, August)

The goal of this presentation is to describe the main scientific contribution of the Aerospace Laboratory of the Liège University (LTAS) during the sixties and seventies. This period was very important ... [more ▼]

The goal of this presentation is to describe the main scientific contribution of the Aerospace Laboratory of the Liège University (LTAS) during the sixties and seventies. This period was very important for the development of the finite element techniques and the major part of the concepts and the algorithms were defined at that time. The contribution of the LTAS was especially original because it was the only team in the world who was proposing the dual method and included it in a Finite Element code for all the applications : bar, membrane and plates, using for both types of models the same displacement solution algorithm. After the presentation of this method a short description is made about recent improvements proposed by the authors. [less ▲]

Controlling form errors from 3D measures

in ASME (Ed.) Proceedings of the 1999 ASME Design Engineering Technical Conference (1999, September)

Owing to the fact that a correct evaluation of form errors is particularly difficult by the classical ways, it seems more efficient to develop numerical algorithms from 3D measures. Several methods are ... [more ▼]

Owing to the fact that a correct evaluation of form errors is particularly difficult by the classical ways, it seems more efficient to develop numerical algorithms from 3D measures. Several methods are described, including direct and iterative ones. A new method is proposed, which is based on Lp-norms and a specialized algorithm. It proved to be the most effective and robust one on every studied application. [less ▲]

Recent advances in the dual analysis theory

Conference (1999, June)

The dual analysis concept, which is one of the oldest methods of measuring the discretization error of finite element models, suffered by its lack of generality in its original version. In fact, severe ... [more ▼]

The dual analysis concept, which is one of the oldest methods of measuring the discretization error of finite element models, suffered by its lack of generality in its original version. In fact, severe restrictions were imposed to the boundary conditions, excluding any mixed problem. These restrictions, related to an analysis where stiffness plays a central role, can be avoided by using the proper reference energy, which is the total complementary energy. This leads to convergence curves which are always on the same side of the exact value and whose distance measures the quality of the analyses. [less ▲]

La fabrication, un problème de conception

Conference (1999)

Communication about the interactions between design and manufacturing and their necessary complementarity

Sur l'évaluation des défauts de forme à partir de mesures tridimensionnelles

in European Journal of Mechanical and Environmental Engineering (1998), 43(1), 13-21

Owing to the fact that a correct evaluation of form errors is particularly difficult by the classical ways, it seems more efficient to develop numerical algorithms from 3D measures. Several methods are ... [more ▼]

Owing to the fact that a correct evaluation of form errors is particularly difficult by the classical ways, it seems more efficient to develop numerical algorithms from 3D measures. Several methods are described, including direct and iterative ones. A new method is proposed, which is based on Lp-norms and a specialized algorithm. It proved to be the most effective and robust one in every studied application. Another problem which is seldom studied, concerns the sensibility of form errors to measure errors. A theory is presented which leads to a very simple result. [less ▲]

catalogue des cas-tests

Report (1996)

This report describes the benchmarks which have been done with the machining simulation prototype.

Commentaires sur les quatre essais réalisés chez Renault

Report (1996)

RENAULT had performed a series of machining tests in the frame of the feasability study of a machining simulation tool. This report is a first critical analysis of the results.