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Andreas Mortensen

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Related publications (138)

Materials science: Pleated crystals

Andreas Mortensen, Francesco Stellacci

2010

Yield surface of polyurethane and aluminium replicated foam

Willy Dufour, Andreas Mortensen, Etienne Combaz, Raphaël Charvet, Claudio Bacciarini

It has been proposed in the literature, based on theoretical considerations and on finite-element calculations, that all three stress tensor invariants govern the yield surface of cellular materials. Recent experiments on 75 gm pore size aluminium replicat ...

Elsevier2010

Influence of reinforcement contiguity on the thermal expansion of alumina particle reinforced aluminium composites

Andreas Mortensen, Ludger Weber, Reza Tavangar Hamzehkolaei, Ghodratollah Roudini

Pore-free composites combining alumina particles within a matrix of pure aluminium are produced by pressure infiltration, varying systematically the degree of the contiguity, beta, of the ceramic phase by sintering prior to infiltration. The thermal expans ...

2010

Improvement of elevated temperature mechanical properties of Cu–Ni–Sn–Pb alloys

Andreas Mortensen, Vincent Laporte, Doris Empl

Cu-Ni-Sn alloys with Pb additions exhibit high mechanical strength at room temperature coupled with good machinability but experience a significant ductility loss above the melting point of lead. We explore here the influence of minor additions of Al, Mn, ...

Elsevier2010

Influence of chemistry and microstructure on the activation volume of TiAl alloys

Andreas Mortensen, Nicolas Vincent Barbi, Luc Rougier, Frédéric Diologent

Repeated stress-relaxation experiments are conducted from RT to 1073 K on three different gamma + alpha(2) TiAl alloys (Ti-46Al with 8Ta, 8Nb or 7Nb) One is a conventional duplex alloy, the two other are novel "convoluted" cast titanium aluminides develope ...

Elsevier2010

Fracture toughness of Al replicated foam

Andreas Mortensen, Etienne Combaz

Elastoplastic toughness testing of pure aluminium replicated foam is conducted following a J-procedure adapted from the ASTM E1820-08a standard using disc-shaped compact tension specimens. Tests cover a wide range of foam relative density V-m (10-24%). Res ...

Elsevier2010

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

Andreas Mortensen, Aude Hauert, Andreas Rossoll

2009

Dihedral Angles in Cu-1wt.%Pb: Grain Boundary Energy and Grain Boundary Triple Line Effects

Laurent Felberbaum, Andreas Mortensen, Vincent Laporte, Doris Empl

The dihedral angle shown by intergranular lead inclusions in Cu-1 wt.% Pb alloys is measured varying the purity of the metal and the temperature. Several measurement methods are used and compared, namely classical two-dimensional (2D) methods based on meta ...

2009

Surface oxide in replicated microcellular aluminium and its influence on the plasticity size effect

Andreas Mortensen, Frédéric Diologent

The oxide film present along the interface between metal and pores in microcellular aluminium produced by replication depends on the leaching medium that is used to dissolve the NaCl preform: leaching in water produces a thick and irregular multilayered hy ...

2009

Processing of Ag-Cu alloy foam by the replication process

Andreas Mortensen, Ludger Weber, Etienne Combaz, Vincent Laporte, Frédéric Diologent, Fabien Duc

Particulate reinforced material ...

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

Creep of aluminium-magnesium open cell foam

Andreas Mortensen, Frédéric Diologent

Aluminium-5 wt.% magnesium open cell foam produced by replication and tested in tension at 300, 350 or 450 degrees C creeps at rates between 10(-3) and 10(-8) s(-1). The behaviour of the foam matches that of the alloy from which it is made: three-power law ...

2009

Uniaxial deformation of microcellular metals: model systems and simplified analysis

Jean-François Despois, Randoald Müller, Andreas Mortensen, Yves Conde, Etienne Combaz, Frédéric Diologent, Sébastien Philippe Soubielle

Microcellular aluminium can be produced by a process known as replication; this involves the infiltration of a packed bed of NaCl particles which are subsequently leached after metal solidification. The resulting material features a uniform distribution of ...

Springer2009

Microstructure, Strength and Creep of Aluminium-nickel Open Cell Foam

Andreas Mortensen, Yves Conde, Frédéric Diologent

Al-6.4 wt% Ni open-cell foams produced by replication are tested in compression and in tension at room temperature and creep tested in tension at 450C. The mechanical behaviour of this foam at room temperature is consistent with that observed for other ope ...

2009

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

Intermediate temperature embrittlement of copper alloys

Andreas Mortensen, Vincent Laporte

Copper and its alloys generally display a severe reduction in ductility between roughly 300 and 600 degrees C, a phenomenon variously called 'intermediate temperature embrittlement' or 'ductility trough behaviour'. This review of the phenomenon begins by p ...

2009

Fracture behavior of low-density replicated aluminum alloy foams

Andreas Mortensen

Tensile tests have been performed on replicated aluminum alloy foams of relative density between 4.5% and 8%. During the test the electrical resistance was measured with a four-point set-up and the displacements along the gage section were measured using a ...

2008

Equilibrium shape of a liquid intergranular inclusion in a stressed elastic solid

Laurent Felberbaum, Andreas Mortensen, Vincent Laporte

The influence of applied stress on the equilibrium shape of a liquid intergranular inclusion is derived to show that (i) results differ significantly from those for a void, and (ii) this difference explains the experimental data if liquid inclusions behave ...

2008

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

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