Do polymers have plasticity?
Do polymers have plasticity?
Plasticity of polymers refers to large deformations of amorphous polymers in a temperature range below and near the glass transition temperature, and of semicrystalline polymers below their melting temperature. Semicrystalline polymers are very often deformed when the amorphous phase is in the rubberlike state.
Do polymers have plastic deformation?
A ductile material shows a characteristic yield point followed by a drop in strength and break at lower stress but much higher strain. At this point, the material starts to undergo plastic deformation. Amorphous polymers, when physically aged, exhibit soemtimes true strain softening. …
How does plastic deformation occur in a thermoplastic polymer?
What is crazing in polymers? Crazing occurs in thermoplastics when localized regions of plastic deformation form in a direction perpendicular to that of the applied stress. In transparent thermoplastics, such as some of the glassy polymers, the craze produces a translucent or opaque region that looks like a crack.
What is plastic deformation in geology?
Definition of plastic deformation : a permanent deformation or change in shape of a solid body without fracture under the action of a sustained force small changes in the density of crystals due to plastic deformation— Louise R. Smoluchowski plastic flow of crystalline rocks — Journal of Geology.
What is the difference between a polymer and a plastic?
Polymers can exist organically or be created synthetically, and consist of chains of joined individual molecules or monomers. Plastics are a type of polymer composed of chains of polymers which can be partially organic or fully synthetic. Simply put, all plastics are polymers, but not all polymers are plastics.
What causes plastic deformation?
Plastic deformation is the permanent distortion that occurs when a material is subjected to tensile, compressive, bending, or torsion stresses that exceed its yield strength and cause it to elongate, compress, buckle, bend, or twist.
What does plastic deformation depend on?
Generally, plastic deformation is also dependent on the deformation speed, i.e. higher stresses usually have to be applied to increase the rate of deformation. Such materials are said to deform visco-plastically.
What is plastic made of polymer?
Plastics are high molecular weight organic polymers composed of various elements such as carbon, hydrogen, oxygen, nitrogen, sulphur and chlorine. They can also be produced from silicon atom (known as silicone) along with carbon; a common example is silicone breast implants or silicone hydrogel for optical lenses.
What do you mean by plastic deformation?
Plastic deformation is a process in which enough stress is placed on metal or plastic to cause the object to change its size or shape in a way that is not reversible. In other words, the changes are permanent; even when the stress is removed, the material will not go back to its original shape.
What is an example of plastic deformation?
Examples of plastic deformation, on the other hand, include the bending of a steel rod under tension or the breaking of a glass under compression. Note that in the case of the steel rod, the object is deformed without rupturing-that is, without breaking or reducing to pieces.
What does plastic deformation mean?
plastic deformation. noun. variants: or plastic flow. : a permanent deformation or change in shape of a solid body without fracture under the action of a sustained force small changes in the density of crystals due to plastic deformation— Louise R. Smoluchowski plastic flow of crystalline rocks — Journal of Geology .
What happens when plastic deformation of a material occurs?
Plastic deformation is the permanent distortion that occurs when a material is subjected to tensile, compressive, bending, or torsion stresses that exceed its yield strength and cause it to elongate, compress, buckle, bend, or twist . From:Materials Enabled Designs, 2009
