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Related to permanent deformation: Plastic deformation
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Permanent deformation for the upper sheet reached conformity level at 77%.
Wostmann, Influence of prolonged setting time on permanent deformation of elastomeric impression materials.
As expected, in the permanent deformation stage, increasing the temperature for all the samples increased the permanent deformation and reduced the ability of the material to recover the deformation elastically.
After unloading, the irrecoverable or permanent deformation is the plastic strain and it could be considered as a new reference state, where the elastic response can be measured since the failure is not achieved (Wood, 1991).
c], from which permanent deformation occurs, was defined by the previously calculated strength [3-4].
The Zhou model has been used by current studies to evaluate the permanent deformation of asphalt mixtures [12-15].
35 N/m, permanent deformation will exist in implant geometry and permanent damage to bone tissue with possible fracture, this is not consistent with clinical practice since in implant procedures applied with safety factor torque of 0.
In this paper the main objective was to verify the durability of various road structures and verification of design methods, which are used with application of standard FEM programs and selected empirical equations, for determining the fatigue life and the level of permanent deformation.
During the last decades, there have been dramatic changes in traffic volumes, traffic weights and tyre pressures, which have resulted in a significant increase in a permanent deformation of hot mix asphalt (HMA) pavements.
Polyvinyl siloxanes are frequently reported to be the most ideally elastic impression materials because they exhibit better elastic recovery and less permanent deformation than the other elastomers.
Moreover, the steel sheets that constitute the structure are extremely thin and therefore subject to permanent deformation induced by the multiple impacts of abrasives against the sheet's superficial fibres: the so called "shot-peening effect ".
The impression requires elastic deformation as it is removed from the mouth; however, permanent deformation can be minimized if the material has a sufficiently high elastic limit.

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