Deflection length

Defined as the deflection/length of an injection molded wall. A tray configuration (8.5" x 11") is molded, and the length between two edges are measured and compared with the vertical distance from a reference point midpoint on an attached wall. 

Figure 5.14 (a) A confined chain inside a pore is a set of blobs of diameter Dp. (b) A semiflexible chain is deflected by the pore at a contour distance of s, called the deflection length kj. (c) A long semiflexible chain is a series of deflection lengths, (d) Hairpin formation by semiflexible chains, (e) A chain confined in a channel is a two-dimensional self-avoiding-walk of blobs of diameter Dp. 

We define the arc length s, at which a semiflexible chain-contour collides with the pore wall on an average, as the deflection length (Odijk 1983), satisfying the relation of Equation 5.55... 

Let us now consider a semiflexible chain of length L larger than its persistence length tp, which in turn is larger than the deflection length Xd... 

Supports. The spaciag of supports is governed by the hot allowable stress of the piping materials stabiUty, ia the case of large-diameter thin-wall pipe deflection to avoid sagging or pocketing and the natural frequency of the unsupported length to avoid susceptibiUty to undesirable vibration. 

At its simplest, the mirror is a circular disc, of diameter 2a and mean thickness f, simply supported at its periphery (Fig. 7.2). When horizontal, it will deflect under its own weight M when vertical it will not deflect significantly. We want this distortion (which changes the focal length and introduces aberrations into the mirror) to be small... 

The square-section beam of length / (determined by the design of the structure, and thus fixed) and thickness t (a variable) is held rigidly at one end while a force F (the maximum service force) is applied to the other, as shown in Fig. 7.4. The same texts that list the deflection of discs give equations for the elastic deflection of beams. The formula we want is... 

A uniform, rectangular-section beam of fixed width w, unspecified depth d, and fixed length L rests horizontally on two simple supports at either end of the beam. A concentrated force E acts vertically downwards through the centre of the beam. The deflection, 8, of the loaded point is... 

At small strains the cell walls at first bend, like little beams of modulus E, built in at both ends. Figure 25.10 shows how a hexagonal array of cells is distorted by this bending. The deflection can be calculated from simple beam theory. From this we obtain the stiffness of a unit cell, and thus the modulus E of the foam, in terms of the length I and thickness t of the cell walls. But these are directly related to the relative density p/ps= t/lY for open-cell foams, the commonest kind. Using this gives the foam modulus as... 

Shaft deflection is the result of an external radial load. The external radial loading originates with the pump operator or proee.ss when the pump runs away from its best effieieney point on the curve. The resistance to deflection is a function of the shaft s overhang length and its diameter. The deflection resi.stanee, also called the flexibility laetor, is known as the L/D laetor. 

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