Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Abstract Plastic deformation can be defined as a non-recoverable deformation which leads to a permanent ‘set’. Conventionally yield occurs when a given stress, the yield point, is exceeded as illustrated in Figure 1. For most polymers the tensile yielding behaviour is better described by curve (B) in which yield is followed by a load drop in the nominal stress-strain curve and the formation of a neck which grows to fill the gauge volume at a nearly constant flow stress. This is followed by strain hardening, a rapid increase in flow stress with strain. In many cases the value of the yield point is not well defined and it often common to quote a flow stress at a given strain. In the case of polymers, the ‘permanent’ deformation may decrease with time or even disappear completely if the material is heated close to Tg. This arises because of the viscoelastic nature of polymer deformation and the entropic forces which tend to relax extended chains if sufficient thermal energy is available. The resultant recovery that may take place after removal of a load is described in the article Recovery Behaviour of Glassy Polymers. (see also Viscoelasticity, Stress and Strain).
Abstract Plastic deformation can be defined as a non-recoverable deformation which leads to a permanent ‘set’. Conventionally yield occurs when a given stress, the yield point, is exceeded as illustrated in Figure 1. For most polymers the tensile yielding behaviour is better described by curve (B) in which yield is followed by a load drop in the nominal stress-strain curve and the formation of a neck which grows to fill the gauge volume at a nearly constant flow stress. This is followed by strain hardening, a rapid increase in flow stress with strain. In many cases the value of the yield point is not well defined and it often common to quote a flow stress at a given strain. In the case of polymers, the ‘permanent’ deformation may decrease with time or even disappear completely if the material is heated close to Tg. This arises because of the viscoelastic nature of polymer deformation and the entropic forces which tend to relax extended chains if sufficient thermal energy is available. The resultant recovery that may take place after removal of a load is described in the article Recovery Behaviour of Glassy Polymers. (see also Viscoelasticity, Stress and Strain).
Yield and Plastic Deformation
Swallowe, G. M. (Autor:in)
01.01.1999
5 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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