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Perfect plasticity is a property of materials to undergo irreversible deformation without any increase in stresses or loads. Plastic materials that have been hardened by prior deformation, such as cold forming, may need increasingly higher stresses to deform further. Generally, plastic deformation is also dependent on the deformation speed, i.e ...
The scholarly analysis of material culture, which can include both human made and natural or altered objects, is called material culture studies. [6] It is an interdisciplinary field and methodology that tells of the relationships between people and their things: the making, history, preservation and interpretation of objects. [ 7 ]
An alternative approach is to add a strain rate dependence to the yield stress and use the techniques of rate independent plasticity to calculate the response of a material. [ 4 ] For metals and alloys , viscoplasticity is the macroscopic behavior caused by a mechanism linked to the movement of dislocations in grains , with superposed effects ...
Plastic deformation of a thin metal sheet. Flow plasticity is a solid mechanics theory that is used to describe the plastic behavior of materials. [1] Flow plasticity theories are characterized by the assumption that a flow rule exists that can be used to determine the amount of plastic deformation in the material.
A material property is an intensive property of a material, i.e., a physical property or chemical property that does not depend on the amount of the material. These quantitative properties may be used as a metric by which the benefits of one material versus another can be compared, thereby aiding in materials selection. A property having a ...
The exact mechanisms that control electroplasticity vary based on the material and the exact conditions (e.g., temperature, strain rate, grain size, etc.). Enhancing the plasticity of materials is of great practical interest as plastic deformation provides an efficient way of transforming raw materials into final products.
When plastic products are recycled, it is highly likely that the additives will be integrated into the new products. Plastic waste, even if it is all of the same polymer type, will contain varying types and amounts of additives. Mixing these together can give a material with inconsistent properties, which can be unappealing to industry.
Hydroperoxide decomposition occurs when metal and metal ions within the plastic material lead to the deterioration of the object [13] Plasticizer migration occurs when additive chemicals intended to keep a plastic resin soft and pliable gradually move to the surface or are shed from an object. The loss of these chemicals causes the plastic to ...