Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers



Last updated: January 27, 2020

What Does Displacement Mean?

Displacement is a vector quantity that refers to how far out of place an object is — the object's overall change in position. A change in shape can be described by the displacements of points on the structure. The displacement caused by deformation displacement reactions may cause corrosion.

A strain is a normalized measure of deformation representing the displacement between particles in the body relative to a reference length.


Corrosionpedia Explains Displacement

Displacement is the absolute movement of a point with respect to a fixed reference frame. Stresses produce deformations because real materials are not infinitely rigid. Deformations are measured by strains. Integration of strains through space gives displacements, which measure motions of the particles of the body (structure). As a result the body changes size and shape:

Stresses => Strains => Displacement => Size & Shape changes

In ideal solids, atoms are arranged neatly without any disruptions. Under mechanical loads, all solids tend to reshape themselves. Shear stress is a periodic function of displacement, as each atom is attracted to the nearest atom of the next row.

Strain is the result of a relatively small displacement of the atoms in the crystal lattice. The strain affects the material's properties of the semiconductor, for example the lattice constant, energy gap and effective masses of electrons and holes. The displacement that minimizes the total energy is a consequence of a subtle balance between the two forces and results in different bond lengths within the same tetrahedron.

A change in the configuration of a continuum body results in a displacement. The displacement of a body has two components: rigid-body displacement and deformation. A rigid-body displacement consists of a simultaneous translation and rotation of the body without changing its shape or size. Deformation implies the change in shape and/or size of the body from an initial or undeformed configuration to a current or deformed configuration.


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