Dislocation Ontology
Ahmad Zainul Ihsan
Edge Dislocation
A dislocation that has a line sense perpendicular to its Burgers vector.
has family crystal direction
hasFamilyCrystalDirection represents the relationship between lattice direction and family of crystal direction.
has family crystal plane
hasFamilyCrystalPlane represents the relationship between the lattice plane and the family of crystal planes.
A quantity is the measurement of an observable property of a particular object, event, or physical system. A quantity is always associated with the context of measurement (i.e. the thing measured, the measured value, the accuracy of measurement, etc.) whereas the underlying quantity kind is independent of any particular measurement. Thus, length is a quantity kind while the height of a rocket is a specific quantity of length; its magnitude that may be expressed in meters, feet, inches, etc. Examples of physical quantities include physical constants, such as the speed of light in a vacuum, Planck's constant, the electric permittivity of free space, and the fine structure constant. In other words, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, momentum, energy, and weight, and units are used to describe their measure. Many of which are related to each other by various physical laws, and as a result the units of some of the quantities can be expressed as products (or ratios) of powers of other units (e.g., momentum is mass times velocity and velocity is measured in distance divided by time). These relationships are discussed in dimensional analysis. Those that cannot be so expressed can be regarded as "fundamental" in this sense. A quantity is distinguished from a "quantity kind" in that the former carries a value and the latter is a type specifier.
A Quantity Kind is any observable property that can be measured and quantified numerically. Familiar examples include physical properties such as length, mass, time, force, energy, power, electric charge, etc. Less familiar examples include currency, interest rate, price to earning ratio, and information capacity.
A Quantity Value expresses the magnitude and kind of a quantity and is given by the product of a numerical value n and a unit of measure U. The number multiplying the unit is referred to as the numerical value of the quantity expressed in that unit. Refer to NIST SP 811 section 7 for more on quantity values.
A unit of measure, or unit, is a particular quantity value that has been chosen as a scale for measuring other quantities the same kind (more generally of equivalent dimension). For example, the meter is a quantity of length that has been rigorously defined and standardized by the BIPM (International Board of Weights and Measures). Any measurement of the length can be expressed as a number multiplied by the unit meter. More formally, the value of a physical quantity Q with respect to a unit (U) is expressed as the scalar multiple of a real number (n) and U, as \(Q = nU\).
Crystallographic Defect
The crystallographic defect is a lattice irregularity that has one or more dimensions on the order of an atomic diameter.
has position vector
hasPositionVector represents the relationship between entity and position vector.
Line Defect
Linear or one-dimensional defect around which some of the atoms are misaligned.
Screw Dislocation
A dislocation that has a line sense parallel to its Burgers vector.
family direction miller indice
familyDirectionMillerIndice represents a set of miller indices of lattice direction in string.
family plane miller indice
familyPlaneMillerIndice represents a set of Miller indice of lattice plane in string.
has end node
Sub-property of hasNode that relates the segment with the end node.
has mathematical representation
hasMathematicalRepresentation relates the entity with its mathematical representation.
has numerical representation
hasNumericalRepresentation relates the entity with its numerical representation.
has segment
hasSegment represents the relationship between discretized line and segment.
has shape function
hasShapeFunction represents the relationship between discretized line and shape function.
has start node
Sub-property of hasNode that relates the segment with the start node.
has vector origin
hasVectorOrigin represents the relationship between lattice plane and origin.
moves on
movesOn represents the relationship between dislocation and slip plane.
plane miller indice
planeMillerIndice represents Miller indice of lattice plane in string.
results in
resultsIn represents the relationship between dislocation and lattice displacement.
slipArea
slipArea represents the slip area of discretized line in double.
Position Vector
Euclidean vector that represents the position of a point P in space in relation to an arbitrary reference origin O.
Vector Component of Basis
Vector components/vector coordinates of particular basis. It has relation to a specific basis.
Field Ion Microscopy
Field Ion Microscopy (FIM) is a microscopy technique that can be used to image the arrangement of atoms.
Lattice Displacement
The displacement of atoms from their perfect lattice sites due to the existence of defects, e.g., point defect, line defect, and grain boundary.
Shape Function
The shape function is the function that interpolates the solution between the discrete values obtained at the mesh nodes. In discretized dislocation, the shape function determines the shape of a segment and ultimately determines the shape of the line. Examples of shape function that is used to discretize the dislocation are circular, elliptic, spiral, linear, cubic, and quintic.
Ursprung
Vector Origin
A fixed point that is needed by the vector to identify other points in the space relative to its origin.
direction miller indice
directionMillerIndice represents Miller indice of lattice direction in string.
has Burgers vector
hasBurgersVector represents the relationship between dislocation to Burgers vector.
has lattice plane
hasLatticePlane represents the relationship between a lattice and lattice planes.
has line sense
hasLineSense represents the relationship between dislocation and line sense.
has node
hasNode represents the relationship between segment and node.
has representation
hasRepresentation relates the entity to another representation of entity.
has slip plane
hasSlipPlane represents the relationship between crystal structure and slip plane.
has slip system
hasSlipSystem represents the relationship between a crystal structure and slip system.
is segment of
Inverse of hasSegment
observed by
observedBy represents the relationship between dislocation and microscopy techniques, e.g., TEM, FIM, etc.
Basis
A basis defines a spatial unit used to express fractional coordinates.
Set of vector(in 2-D two vectors and in 3-D three vectors) that linearly independent.
Crystal Structure
A crystal structure is described by the lattice geometry and atomic arrangements within the unit cell.
Lattice
The mathematical concept to represent the periodicity of a crystal. A lattice defines a periodic arrangement of one or more atoms.
Burgers Vector
An elementary unit (length order of lattice parameter) of lattice translation. The basic notion of the Burgers vector comes from the closure failure of an initially perfect lattice due to the existence of dislocation. The magnitude and direction of closure failure are characterized by the Burgers vector.
Family of Crystal Direction
A set of symmetrically equivalent directions in the lattice.
Line Sense
A sense that characterizes a directed line, i.e., it has a start and an end.
Transmission Electron Microscopy
Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is often an ultrathin section less than 100 nm thick.
Coordinate Vector
A coordinate vector according to standard basis, i.e., e_x (1, 0, 0), e_y(0, 1, 0), and e_z (0, 0, 1).
Point
In classical Euclidean geometry, a point is a primitive notion that models an exact location in the space, and has no length, width, or thickness.
Vector
(Euclidean) vector is used to represent quantities that both magnitude and direction.
(Euclidean) vector used to represent quantities that both magnitude and direction.
Family of Crystal Plane
A set of symmetrically equivalent planes in the lattice.
has slip direction
hasSlipDirection represents the relationship between the slip plane or slip system with the slip direction.
has slip plane normal
hasSlipPlaneNormal represents the relationship between a slip plane or slip system with slip plane normal.
Line
Mathematical representation of dislocation as 'Line'. An instance of mathematical representation of a dislocation line is an oriented curve parameterized by its arc length.
Slip Direction
The direction in the slip plane along which plastic deformation takes place. The slip direction corresponds to one of the shortest lattice translation vectors.
Slip System
A slip system is defined as the set of slip planes with the same unit normal vector and the same slip direction.
Node
A point of a segment.
Slip Plane Normal
The unit normal vector of slip planes.
has lattice direction
hasLatticeDirection represents the relationship between a lattice or a lattice plane with lattice directions.
has lattice point
hasLatticePoint represents the relationship between a lattice or lattice plane or lattice direction with lattice point.
Lattice Point
Lattice point is the point where atom(s) or molecule(s) is located.
Segment
The segment is a part of a line bounded by two distinct end points and may contain points on the line between its endpoints.
Slip Plane
The crystallographic/lattice plane along which the dislocation line traverses/moves. The slip plane is usually the plane with the highest density of atoms, i.e. most widely spaced.
Discretized Line
The numerical representation of the dislocation line that is discretized into the number of segments.
Versetzung
Dislocation
Linear or one-dimensional defect around which some of the atoms are misaligned. In the mesoscale, a dislocation is a line object that is a boundary separating the regions on the slip plane which have undergone slip from those that have not.
The presence of dislocation introduces local disturbance of the atomic-level geometry.
Lattice Plane
The lattice plane forms an infinitely stretched plane (characterized through a plane normal) that cuts through lattice points such that, again, a regular arrangement of lattice points in the plane occurs.
Lattice Direction
The vector direction inside the lattice that is connecting two lattice points.