Concept

Casting defect

Related publications (79)

Mechanisms of void initiation at small hard particles and implications for ductile fracture

Ductile fracture in steels is essentially due to cavity nucleation, growth and coalescence. Once voids are initiated in the metallic matrix, and the deformation continues to increase, voids grow in size and finally coalescence to fracture. This dissertatio ...

EPFL2006

Rheological Behavior of Al-Cu Alloys during Solidification: Constitutive Modeling, Experimental Identification, and Numerical Study

Jean-Marie Drezet

The rheological behavior of a solidifying alloy is modeled by considering the deforming material as a viscoplastic porous medium saturated with liquid. Since the solid grains in the mush do not form a fully cohesive skeleton, an internal variable that repr ...

2005

Structuration of micro-fluidic devices based on low temperature co-fired ceramic (LTCC) technology

Peter Ryser, Thomas Maeder, Caroline Jacq, Hansu Birol, Yannick Sébastien Fournier, Giancarlo Corradini, Sigfrid Straessler

Smart packaging concept has been the driving force for the search of advanced technologies to produce multi-functional micro-scale devices for long years. In this sense, LTCC technology has been recently addressed as the suitable choice for a wide range of ...

2005

Resin transfer moulding of anionically polymerized polyamide 12

Véronique Michaud, Pierre-Etienne Bourban

Liquid composite moulding of Lactam 12 monomer and activating system (APLC12) into satin weave carbon fabrics is investigated, with emphasis on minimising the void content in the final part. The main sources for void formation are identified. The solidific ...

2005

SAMARIS D13 - Report on preliminary studies for the use of HPFRCC for the rehabilitation of road infrastructure components

Emmanuel Denarié, Katrin Habel

The aims of the preliminary study reported in this document were twofold. Firstly, within the context of the application of UHPFRC for the rehabilitation of reinforced concrete structures, to identify the phenomena that require further study with respect t ...

MCS/SAMARIS2004

Coalescence and mechanical behaviour of semi-solid aluminium alloys in relation to hot tearing

Piero Daniele Grasso

Semi-continuous direct-chill (DC) casting of aluminium ingots suffers from a very frequent defect which can lead to a strong decrease in productivity: hot tearing. This phenomenon takes place in the mushy state (i.e., at solid fractions, gs, lower than uni ...

EPFL2004

Low-profile mechanisms in composites with thermoplastic/polyester blend matrices

Unsaturated Polyester (UP) resins are extensively used as a matrix for the production of composites due to their low cost and versatility. Their significant polymerization shrinkage has however a negative impact on the dimensional stability of the molded p ...

EPFL2004

Ceramic microcomponents by microstereolithography

Philippe Renaud, Heinrich Hofmann, Arnaud Bertsch, Sébastien Jiguet

This paper describes new polymer/ceramic photosensitive resins that can be used in the microstereolithography process for manufacturing complex 3D components in composite material. These new resins contain high loads (up to 80 wt.%) of alumina nanoparticle ...

2004

Etude de l'effet du brassage électromagnétique sur les microstructures d'alliages cuivreux

Thomas Campanella

In order to eliminate internal and surface defects, which appear in the ingots during continuous casting of metallic alloys, homogeneous and fine structures are often required. Therefore, when the adjunction of inoculant substances is not possible, the ele ...

EPFL2003

Hot Tear formation and coalescence observations in organic alloys

Michel Rappaz, Jean-Marie Drezet, Piero Daniele Grasso

Hot tear formation has been observed during the solidification of a succinonitrile–acetone (SCN-acetone) alloy by pulling the columnar dendrites in the transverse direction with a stick. It is observed that the cracking of the mushy zone (hot tears) always ...

TMS Publ.2002

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