5. Glossary
Plastic deformation; plastic deformation
Permanent deformation of a material after mechanical loading. In uniaxial tension, plastic deformation occurs when the stress reaches the plastic flow stress.
Hardness
Resistance of a material to penetration by a pointed or spherical tool
Creep
Progressive increase in the deformation of a material after application of a mechanical load. For a viscoelastic material, this behavior is characterized in a tensile test by the creep modulus J(t) = ε(t)/σ where ε(t) is the deformation of the specimen after application during time t of the stress σ.
Relaxation; relaxation
Gradual decrease in stress in a material after application of a strain. For a viscoelastic material, this behavior...
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