Stress concentration caused by an oblique round hole in a flat plate under uniaxial tension

Abstract

Stress-concentration factors have been determined for oblique holes in flat plates by a method using frozenstress photoelasticity. The ellipses formed at the intersection of the hole and the plate surfaces had their major axes perpendicular to the direction of application of the load.The maximum stress-concentration factor was found to increase with increasing angle of obliquity with respect to the normal to the plate but the experimental factors were found to be considerably lower than those predicted from a theory of Ellyin et al.Graphs are given which enable maximum stress-concentration factors to be obtained for oblique holes having a ratio of hole diameter to plate width of 0.1. It was found that, for the models tested, elliptical hole data gave a reasonable estimate of the maximum stress-concentration factors based on net area.Removing the feather edge of the hole, by applying various edge radii, did not alter the stress concentration appreciably except in so far as load-carrying area was reduced.

Designing against severe stresses at compound cooling holes of double wall transpiration cooled engine components

“…Sensibly, for pure bending the positive effect of 𝜌 𝑂 𝑓 /𝑡 dominates (Fig 17a), whereas tension gives rise to the negative effect, in consistency with previous reports [64].…”

“…These positive and negative effects of 𝜌 𝑂 𝑓 /𝑡, corresponding to pure bending and pure tension continue to apply for inclined holes with elliptical rims in both equibiaxial, 𝜎 𝑥 /𝜎 𝑦 = 1 (see Figs 17c), and uniaxial, 𝜎 𝑥 /𝜎 𝑦 = 0, (see Figs 17d) loading. The difference is that 𝜌 𝑂 𝑓 /𝑡 reduces the max SCF at the 90° wedge in both pure tension and pure bending when 𝜎 𝑦 /𝜎 𝑥 = 0; these results for pure tension are consistent with experimental data reported in [41,42,64].…”

Stress Analysis of Holes in Thick Plates

“…Although the photoelastic data from Refs. [8,18,20] are for maximum principal stress and those from Refs. [13,14] are maximum stress sum values there is a clear trend in the data showing that as the hole obliquity increases the maximum stress moves closer to the plate surface.…”

Finite Element Analysis of Elastic Stresses around Holes in Plate Subjected to Uniform Tensile Loading

“…These holes can be found at non-radial openings in cylindrical and spherical shells, gas engine turbine blades [3,4]. In any ideal, linear elastic component, the ratio of the maximum stress to the nominal stress (σ Max / (σ Min ) is designated as stress concentration factor (k t ).…”