Photoelastic Investigation on Plates with Single Interference-Fit Pins with Load Applied (a) to Pin only and (b) to Pin and Plate Simultaneously

Abstract

SummaryThe reduction in stress concentration factors resulting from the introduction of an interference-fit pin in a circular hole in a flat plate to which a simple tension is applied has already been recorded. The same result is found to occur to an equally marked extent, and qualitatively in a very similar way, when the load is applied to the pin itself. When varying loads are applied to the pin or the plate, the effect of the interference is to produce a rise in the mean stress level at critical points on the hole boundary with a marked fall in the oscillatory stress. There appears to be an optimum value for the “interference stress” for given applied loading conditions at which the endurance of the plate will have its highest value.When loads are applied simultaneously to pin and plate the critical stress on the hole boundary is found to be the mean of the stresses which would be produced by the total load applied separately to the pin and to the plate.

Strain-Relief Inserts for Composite Fasteners -An Experimental Study

“…It is interesting to compare the relatively large magnitude of the strains in the bearing region with the low strains above the hole. Also the magnitude of the compressive strain, E,, , at the rim of the hole located at the lower end of its vertical diameter should be a maximum, as has been reported by several investigators [8][9][10][11]. As shown in Figure 4, the maximum is attained at some distance off the rim of the hole.…”

Reduced dependence on loading parameters in almost conforming contacts

“…It is clear that this field satisfies all the homogeneous equations and inequalities in (13,14) and it will also satisfy the inhomogeneous conditions corresponding to a gap function lg 0 and loading lU; lT. It follows that…”

“…The elastic contact problem has also received a lot of attention from elasticians from the early days of Bickley [5] and Knight [6] who suggested simplified sinusoidal forms of pressure distribution, Howland [7], Howland and Stevenson [8] and Theocaris [9] who studied the infinite strip subject to rivet loading, and Mori [10] (the case of a semi-infinite plate). Also, several experimentalists attacked similar problems, initially by photoelastic methods [11][12][13][14][15][16][17] and also involving orthotropic materials [18]. This work, including more recent investigations, is reviewed by Rao [19].…”

Stress concentration around a loaded bolt in an axially loaded bar

“…The integrals /" and J n have been studied and tabulated by Howland (5). It will be noticed that the values of a 00 and fi 01 are not given in (5)(6)(7)(8)(9)(10)(11)(12) and (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). In fact, they do not appear in the final set of equations and their values are never needed.…”

“…If t h e elastic material occupied t h e whole region r > a, a n d stresses of t h e form (4-8) a n d (4)(5)(6)(7)(8)(9) were applied around r = a, t h e n t h e corresponding stress function would be found b y expanding it in a series of the form In the present problem then, it is natural to expand % (if possible) in a series of the form CD oo X = a* S A n $ n + a» X B n f n , where the A n and the B n are to be determined from the prescribed stress conditions around r = a. It may be possible to show that any x satisfying the conditions P1-P5 set out in section 4 possesses an expansion of the type (6-2).…”