Publications de Andreas Rossoll

The local strength of microscopic alumina reinforcements

Andreas Mortensen, Marco Cantoni, Andreas Rossoll, Martin Guillermo Mueller, Václav Pejchal, Goran Zagar

We measure, using an adaptation of a method designed for ceramic ball bearings, the local strength of a brittle second phase that serves to reinforce a metal. The method uses focused ion beam milling and a nanoindentation device, and is free of artifacts c ...

Elsevier2015

Influence of quench rate and microstructure on bendability of AA6016 aluminum alloys

Cyrille Bezençon, Jean-François Despois, Andreas Mortensen, Andreas Rossoll, Frédéric Diologent

The influence of the quench rate after solution treatment on the bendability of AA6016 aluminum alloy sheets was investigated. Crack initiation during bending tests is found to be independent of quench rate whereas crack propagation is decreased after rapi ...

Elsevier2013

On the load-bearing efficiency of open-cell foams: A comparison of two architectures related to two processes

Andreas Mortensen, Andreas Rossoll

Using a simple beam element, this study estimates the elastic stiffness of two isotropic open-cell foam architectures that approximate, respectively, the space between tightly packed fluid bubbles and that defined between densified solid particles, and fin ...

Elsevier2013

Scaling of conductivity and Young’s modulus in replicated microcellular materials

Andreas Mortensen, Yves Conde, Andreas Rossoll

Scaling exponents for the conductivity and stiffness of replicated microcellular materials exceed commonly predicted values of 1 and 2. We show here that this is caused by the fact that, in replicated microcellular materials, the solid architecture varies ...

Springer US2013

Tensile strength of axially loaded unidirectional Nextel 610 (TM) reinforced aluminium: A case study in local load sharing between randomly distributed fibres

Andreas Mortensen, Benedikt Moser, Andreas Rossoll

The tensile failure of unidirectional alumina fibre reinforced aluminium is studied in uniaxial loading along the fibre axis. The tensile strength is measured as a function of matrix yield strength, which is varied by varying the testing temperature, from ...

2012

Hole and notch sensitivity of aluminium replicated foam

Andreas Mortensen, Andreas Rossoll, Etienne Combaz

The flow and failure behaviour of replicated pure aluminium foams in the presence of holes and notches is explored, varying the pore size and the notch depth or hole radius. Flat dog-bone tensile specimens containing a cylindrical hole, and cylindrical V-n ...

Elsevier2011

Laminated Metal Composites by Infiltration

Andreas Mortensen, Andreas Rossoll, Jérôme Krebs, Alexandre Durussel, Arda Cetin

We show that steel-magnesium alloy laminated metal composites (LMCs) can be produced by gas pressure infiltration of a liquid magnesium alloy between layers of stacked dimpled steel sheets. Resulting LMCs are amenable to subsequent warm rolling. The LMCs a ...

Springer US2011

Fracture of high volume fraction ceramic particle reinforced aluminium under multiaxial stress

Andreas Mortensen, Aude Hauert, Andreas Rossoll

Circumferentially notched cylindrical bars of high volume fraction Al2O3 particle reinforced aluminium are tested in tension to probe the role of tensile stress triaxiality on damage and failure of such materials. The transverse strain is monitored with a ...

Elsevier2010

Particle fracture in high volume fraction ceramic reinforced metals: governing parameters and implications for composite failure

Andreas Mortensen, Aude Hauert, Andreas Rossoll

2009

In situ flow stress of pure aluminium constrained by tightly packed alumina fibres

Andreas Mortensen, Ludger Weber, Benedikt Moser, Andreas Rossoll

The in situ matrix flow stress of continuous fibre-reinforced aluminium is measured in tension along the fibre axis. We use a new, tighter, estimate for the effect differential Poisson contraction between fibres and matrix and take into consideration nonli ...

Elsevier2009

Young's modulus of ceramic particle reinforced aluminium: measurement by the Impulse Excitation Technique and confrontation with analytical models

Andreas Mortensen, Aude Hauert, Andreas Rossoll

2009

Ductile-to-brittle transition in tensile failure of particle reinforced metals

Andreas Mortensen, Aude Hauert, Andreas Rossoll

We present an analytical micromechanical model designed to simulate the tensile stress-strain behaviour and failure of damaging composites containing a high volume fraction of reinforcing particles. One internal damage micromechanism is considered, namely ...

Elsevier2009

Measurement of damage evolution in continuous ceramic fibre-reinforced metals by acoustic emission

Andreas Mortensen, Ludger Weber, Benedikt Moser, Andreas Rossoll

Internal damage in uniaxial continuous alumina fibre-reinforced aluminium is measured by acoustic emission during tensile straining in the fibre direction. Over most of the loading history spatially uncorrelated fibre fragmentation occurs, consistent with ...

2008

Tensile flow stress of ceramic particle-reinforced metal in the presence of particle cracking

Randoald Müller, Andreas Mortensen, Ludger Weber, Andreas Rossoll

A simplified model is proposed to quantity the effect of damage in the form of particle cracking on the elastic and plastic behaviour of particle-reinforced metal matrix composites under uniaxial tensile loading: cracked particles are simply replaced, in a ...

2008

Longitudinal deformation of fibre reinforced metals: Influence of fibre distribution on stiffness and flow stress

Andreas Mortensen, Benedikt Moser, Andreas Rossoll

A computational analysis of the longitudinal deformation of continuous fibre reinforced metals is presented. Elastic and elastic-plastic matrix behaviour are considered. Analytical approaches are confronted with finite element analyses (FEA) for varying fi ...

2005

A stereoscopic method for dihedral angle measurement

Laurent Felberbaum, Andreas Mortensen, Andreas Rossoll

2005