Publication

The effect of prior deformation on the foaming behavior of 'FORMGRIP' precursor material

Andreas Mortensen
2002
Journal Articles

Abstract

It is shown that extrusion of "FORMGRIP" precursor material prior to baking leads to accelerated foaming and finer, more uniform cell structures. This effect is correlated with microstructural observations made on the precursor materials and on the foams, It is thought that, while extrusion apparently does not extensively fracture the gas-generating hydride particles, it does induce sonic damage to their protective surface oxide layers. Removal of the porosity normally present in as-cast precursors may also be beneficial.

Official source

https://infoscience.epfl.ch/entities/publication/81a795ef-dd63-4282-a37d-c6f5177f9fd9

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Andreas Mortensen
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/81a795ef-dd63-4282-a37d-c6f5177f9fd9

About this result

Related concepts (22)

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Work hardening

In materials science, work hardening, also known as strain hardening, is the strengthening of a metal or polymer by plastic deformation. Work hardening may be desirable, undesirable, or inconsequential, depending on the context. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Many non-brittle metals with a reasonably high melting point as well as several polymers can be strengthened in this fashion.

Plasticity (physics)

In physics and materials science, plasticity (also known as plastic deformation) is the ability of a solid material to undergo permanent deformation, a non-reversible change of shape in response to applied forces. For example, a solid piece of metal being bent or pounded into a new shape displays plasticity as permanent changes occur within the material itself. In engineering, the transition from elastic behavior to plastic behavior is known as yielding. Plastic deformation is observed in most materials, particularly metals, soils, rocks, concrete, and foams.

Related publications (1)

The effect of prior deformation on the foaming behavior of 'FORMGRIP' precursor material

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On the stability of carbonate-bearing faults at the brittle-to-ductile transition