A. Schorderet

A set of three-dimensional solid to shell transition elements for structural dynamics

Abstract The development of efficient and reliable transition elements which can connect solid and shell finite elements is of prime importance for an accurate modelling of the transition area between three-dimensional solid continuum and thin shell-like regions of complex structures. This paper presents a large set of C0 compatible transition elements that are based upon standard isoparametric solid and superparametric shell elements. The proposed elements, which incorporate the properties of both solids and shells, are adapted to structural dynamics and satisfy the classical finite element convergence requirements. Several numerical examples which compare the current formulation to previously published results or to analytical and experimental solutions are included.

A subspace iteration algorithm for the eigensolution of large structures subject to non-classical viscous damping

Reference LMAF-ARTICLE-2000-002View record in Web of Science Record created on 2005-09-14, modified on 2017-05-10

Effects of Process Parameters on Ultrasonic Micro‐Hole Drilling in Glass and Ruby

Brittle materials such as ceramics, glasses and oxide single crystals find increasing applications in advanced micro-engineering products. Machining small features in such materials represents a manufacturing challenge. Ultrasonic drilling constitutes a promising technique for realizing simple micro-holes of high diameter-to-depth ratio. The process involves impacting abrasive particles in suspension in a liquid slurry between tool and work piece. Among the process performance criteria, the drilling time (productivity) is one of the most important quantities to evaluate the suitability of the process for industrial applications.

A Combined Structural and Electromechanical FE Approach for Industrial Ultrasonic Devices Design

Ultrasonic assistance is widely used in manufacturing, both for conventional (e. g. grinding, drilling) and non-conventional (e. g. EDM) processes. Ultrasonic machining is also used as a stand alone process for instance for micro-drilling. Industrial application of these processes requires increasingly efficient and accurate development tools to predict the performance of the ultrasonic device: the so-called sonotrode and the piezo-transducer. This electromechanical system consists of a structural part and of a piezo-electrical part (actuator). In this paper, we show how to combine two simulation softwares - for stuctures and electromechanical devices - to perform a complete design analysis and optimization of a sonotrode for ultrasonic drilling applications.