Ger. Name for iron hat or gossan.
See:ferberite
See:ferberite
A trigonal mineral, Na2 Mg(CO3 )2 ; associated with
trona, nahcolite, or in places searlesite, from oil-well cores in
northeastern Utah.
A tetragonal mineral, ThCa2 Si8 O20 ; radioactive;
metamict; from the gem pits of Eheliyagoda, Raknapura district, Sri Lanka;
as fine crystals at the Mont St. Hilare Quarry, PQ, Canada.
A term in Sri Lanka for a drain, as around a gem pit.
An alternative spelling of eleolite.
a. Capable of sustaining stress without permanent deformation; the term is
also used to denote conformity to the law of stress-strain
proportionality. An elastic stress or elastic strain is a stress or strain
within the elastic limit. Roark
b. A physical property of minerals that may be bent without losing
cohesion and that return to their original shape when released, e.g.,
micas. CF:plastic; flexible.
See:creep recovery
The elastic axis of a beam is the line, lengthwise of the beam, along
which transverse loads must be applied in order to produce bending only,
with no torsion of the beam at any section. Strictly speaking, no such
line exists except for a few conditions of loading. Usually the elastic
axis is assumed to be the line that passes through the elastic center of
every section. The term is most often used with reference to an airplane
wing of either the shell or multiple-spar type. CF:torsional center;
flexural center; elastic center. Roark
See:elaterite
The boundary of an underground opening that requires no support. The
material around this boundary may be considered to be in the elastic
state, and no pressure need be exerted against the boundary to prevent the
material from fracturing and falling into the opening. Woodruff
The elastic center of a given section of a beam is that point in the plane
of the section lying midway between the flexural center and center of
twist of that section. The three points may be identical and are usually
assumed to be so. CF:flexural center; torsional center; elastic axis.
Roark
Deformation of a substance, which disappears when the deforming forces are
removed. Commonly, that type of deformation in which stress and strain are
linearly related, according to Hooke's law. CF:plastic deformation
AGI
Design of a structure based on working stresses which are about one-half
to two-thirds of the elastic limit of the material. For redundant frames,
this method of design is replaced by the plastic design.
See also:plastic design
A boundary between strata of different elastic moduli and/or density at
which seismic waves are reflected and refracted. AGI
The property or quality of being elastic; said of a body that returns to
its original form or condition after a displacing force is removed.
See also:elasticity of bulk; Hooke's law. AGI
a. The property possessed by all substances by which they tend to recover
their original volume after being compressed or extended. Hess
b. The elasticity for changes in the volume of a body caused by changes in
the pressure acting on it. The bulk modulus is the ratio of the change in
pressure to the fractional change in volume. See also:elasticity
CTD
The greatest stress that can be developed in a material without permanent
deformation remaining when the stress is released. AGI
See:elaterite