Substructure


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substructure

[¦səb′strək·chər]
(civil engineering)
The part of a structure which is below ground.

Substructure

The foundation and footings as opposed to the superstructure.

Substructure

 

(or subboundary structure), in metals, the internal structure of grains characterized by the type, number, and arrangement of lattice defects.

In undeformed metal, the grains consist of blocks (subgrains) that are misoriented relative to one another by angles of the order of minutes of arc; the blocks are separated by subboundaries. The shape, size, and angular misorientation of the subgrains, as well as the length of the subboundaries, are important characteristics of metal substructure. The subgrains contain dislocations, which form arrays or are in a disordered arrangement. The arrangement of dislocations depends on the nature of the material and the “history” of the sample; for example, for small degrees of deformation, dislocations are concentrated in slip planes.

With increasing deformation in such metals as aluminum or iron, the dislocations form complex spatial networks. The type, structure, and arrangement of the dislocation arrays and the density of dislocations are also characteristic of metal substructure.

V. IU. NOVIKOV

substructure

The foundation or understructure of a building; supports the superstructure.
References in periodicals archive ?
Furthermore, [R.sub.j] is defined as the connection receptance matrix of the jth connection substructure that is the inverse matrix of the connection impedance matrix and is calculated by (2).
The example considers a reanalysis of the truss structure to attach a substructure composed of elements a, b, and c at nodes 14, 8, and 7, respectively, as shown in Figure 5.
The acoustic response curve based on the substructure method largely retains the features of the curve based on the conventional method.
Substructure kinematics equation can be established by dividing the whole structure into several substructures.
Then the differential equation of motion of each substructure can be derived.
Story Drift of the Substructure. Comparison of story drift responses of the substructure between the experimental and numerical simulation results of the aseismic structure, isolated structure, and LSC structure is tabulated in Table 5.
Usually, real materials contain more than one substructure. It is heuristically obvious that each substructure gives its own contribution to the total material behaviour.
All the condensates were deposited in the same technological conditions, ensuring the formation of the nanotwinned substructure in the copper condensates (substrate temperature 260[degrees]C, the deposition rate of the condensates 2 [micro]m [min.sup.-1] (30 nm [s.sup.-1]); the pressure of the residual gases in the chamber did not exceed 1*[10.sup.-3] Pa; the substrate--target distance was 300 mm).
"Our new SciFinder Substructure Module is the first time point-and-click substructure access has been available for CAS databases, including the largest collection of substance information in existence."
Assume that a structure consists of r independent substructure as shown in Figure 1(a).
On the example of copper condensates, produced in electron beam deposition from a vapor phase in vacuum, an effect of substrate temperature on characteristics of their micro- and substructure was studied.
de Kemp both believe that satisfactory resolution of the problem would require extensive rewriting of the substructure module of the search software over too long a period of time Rather than offering an incomplete service, both companies have agreed that it is in the best interest of ORBIT's customers that the database be discontinued at the present time.