2. Determining viscoplastic properties
2.1 Definition of viscoplastic behavior
A viscoplastic material is characterized by a deformation that evolves over time and does not disappear upon discharge.
Various types of loading characterize such behavior. Under constant load, the material creeps: its deformation increases at a rate that may be decreasing or, on the contrary, increasing. If, instead of keeping the load constant, it is the elongation that is stabilized, the stress applied to this end decreases over time: this is a relaxation test. After unloading, material deformation is likely to decrease, a phenomenon known as recovery. In a test where the rate of elongation is kept constant, the material's behavior depends on this rate.
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Determining viscoplastic properties
Bibliography
References
Determining elastic properties
Standardization
European Committee for Standardization (CEN)
- Matériaux métalliques - Essai de traction - Partie 1 : Méthode d'essai à température ambiante. - EN 10002-1 - 2001
- Matériaux métalliques - Essai de traction - Partie 4 : Vérification des extensiomètres utilisés lors d'essais uniaxiaux. - EN 10002-4 - 1994
- Matériaux...
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