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Having a constant diameter, measured at varying angles around the shape, is often considered to be a simple measurement of roundness.This is misleading. [3]Although constant diameter is a necessary condition for roundness, it is not a sufficient condition for roundness: shapes exist that have constant diameter but are far from round.
Schematic representation of difference in grain shape. Two parameters are shown: sphericity (vertical) and rounding (horizontal). Rounding, roundness or angularity are terms used to describe the shape of the corners on a particle (or clast) of sediment. [1] Such a particle may be a grain of sand, a pebble, cobble or boulder.
In metrology and the fields that it serves (such as manufacturing, machining, and engineering), total indicator reading (TIR), also known by the newer name full indicator movement (FIM), is the difference between the maximum and minimum measurements (the range), that is, readings of an indicator, on the planar, cylindrical, or contoured surface ...
Schematic representation of difference in grain shape. Two parameters are shown: sphericity (vertical) and rounding (horizontal). Sphericity is a measure of how closely the shape of an object resembles that of a perfect sphere.
The most common shape factor is the aspect ratio, a function of the largest diameter and the smallest diameter orthogonal to it: = The normalized aspect ratio varies from approaching zero for a very elongated particle, such as a grain in a cold-worked metal, to near unity for an equiaxed grain.
Radius of curvature and center of curvature. In differential geometry, the radius of curvature, R, is the reciprocal of the curvature.For a curve, it equals the radius of the circular arc which best approximates the curve at that point.
A circular segment (in green) is enclosed between a secant/chord (the dashed line) and the arc whose endpoints equal the chord's (the arc shown above the green area). In geometry , a circular segment or disk segment (symbol: ⌓ ) is a region of a disk [ 1 ] which is "cut off" from the rest of the disk by a straight line.
Circularity may refer to: Circular definition; Circular economy; Circular reasoning, also known as circular logic Begging the question; Circularity of an object or roundness; A circularity ratio as a compactness measure of a shape; An assumption of ANOVAs, with repeated-measures, often called "sphericity"