The evaluation of the characteristics of a dental restorative material is based on several criteria such as the
ability of the material to resist to potential degradation, its durability, the stress it exerts on the residual dental structures,
its resistance to surface wear, and its resistance to fracture. All these important factors must be taken into account and
tested when developing a new dental restorative material. Glass ionomer cements (GIC) possess unique properties,
including adhesion to tooth structure, bioactivity and fluoride release. The objective of this study is to evaluate by
analyzing the dynamics of the polarized speckle field how GIC samples, prepared according to two different methods
and conserved in water at 35°C, deteriorate.
This study concerns the pseudoelasticity of Shape Memory Alloys (SMA). A series of tests under tension-compression-torsion
multiaxial loadings is used to show the validity of a conjecture concerning the relation between the volume
fraction of martensite and the equivalent transformation strain. It is shown that the proportionality between an ad doc
equivalent transformation strain and the volume fraction of martensite is confirmed under multiaxial proportional and
nonproportional loadings.
This study concerns the superelasticity of Shape Memory Alloys (SMA) under cyclic loading. A particular attention is
paid to the evolution of residual strain with number of cycles (like ratcheting in cyclic plasticity of classical metals). To
study the phenomenology of the cyclic behavior and to identify the origin of the developed residual strain a series of
cyclic uniaxial tensile tests on copper based alloys wires has been realized. A macroscopic model describing the cyclic
behavior of superelastic SMA has been proposed. The originalities of the model are, on the one hand, the definition of a
particular elasticity domain when the material is in a two phased state and, on the other hand, an ad hoc kinetic of
transformation strain taking into account a residual strain evolution. The proposed model has been identified using our
experimental data base and has been used to simulate various cyclic multiaxial loadings.
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