Photoelastic Investigation on Plates with Single Interference-Fit Pins with Load Applied to Plate Only

1956 ◽  
Vol 7 (4) ◽  
pp. 297-314 ◽  
Author(s):  
H. T. Jessop ◽  
C. Snell ◽  
G. S. Holister
Keyword(s):  
Stress Concentration ◽  
Flat Plate ◽  
Circular Hole ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Hole Diameter ◽  
Interference Fit ◽  
Applied Tension ◽  
Photoelastic Investigation ◽  
Hole Boundary

SummaryThe introduction of an interference-fit pin in a circular hole in a flat plate is found to result in a reduction in the stress concentration factor at the hole boundary under tension applied to the plate. The S.C.F. decreases rapidly with increase in the ratio of interference stress to applied tension, and decreases also with increase in the ratio of hole diameter to width of plate. Very little difference in the S.C.F. is found for different ratios of Young's modulus of pin and plate.

Stress Concentration at a Nearly Circular Hole With Uncertain Irregularities

1992 ◽  
Vol 59 (2S) ◽  
pp. S65-S71 ◽  
Author(s):  
Dan Givoli ◽  
Isaac Elishakoff
Keyword(s):  
Stress Concentration ◽  
Circular Hole ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Maximum Stress ◽  
Polar Coordinates ◽  
Elastic Plane ◽  
Worst Case ◽  
Hole Profile ◽  
Hole Boundary

We study the stress concentration on the boundary of an uncertain nearly circular hole in an infinite elastic plane under uniform radial tension at infinity. The uncertainty in the deviation of the hole profile from an ideal circle is modeled deterministically. The shape of the hole boundary in polar coordinates is assumed to have the form r = R + εh(θ), where R is the radius of the unperturbed circle and ε is a small parameter. First, we find an asymptotic solution for the stress concentration factor around the hole for any profile h(θ). Then we consider a certain set of bounded profiles, and we find the specific profile that yields the maximum stress concentration factor. This may provide the designer with a useful “worst case” information regarding the influence of the uncertainty of the hole shape on the uncertainty of the resulting stress concentration factor.

Simple formulae for the stress concentration factor for two- and three-dimensional holes in finite domains

2002 ◽  
Vol 37 (3) ◽  
pp. 259-264 ◽  
Author(s):  
Q. Z Wang
Keyword(s):  
Stress Concentration ◽  
Circular Hole ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Spherical Cavity ◽  
Three Dimensional ◽  
Finite Domain ◽  
Three Dimensional Models ◽  
Finite Domains ◽  
Asymptotic Validity

First, based on an approximate analysis, simple closed-form expressions of the stress concentration factor (SCF) for two- or three-dimensional models with a circular hole or a spherical cavity in a finite domain are derived. Then, an asymptotic method is adopted to improve the accuracy of the derived solutions for an extremely large circular hole or spherical cavity, when the remaining ligament approaches zero. Exact limit SCF values for these two kinds of models were given by Koiter; these values are used for the adjustment of the coefficients in the SCF expressions. Finally, simple SCF formulae for these finite domain problems are obtained, their accuracy is demonstrated to be very good by comparison with the available data from the literature, and the asymptotic validity is guaranteed.

The Use of an Interference-Fit Bush to Improve the Fatigue Life of a Pin-Jointed Connection

1962 ◽  
Vol 13 (3) ◽  
pp. 275-284 ◽  
Author(s):  
T. H. Lambert ◽  
R. J. Brailey
Keyword(s):  
Shear Stress ◽  
Fatigue Life ◽  
Stress Concentration ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Interference Fit ◽  
Light Interference ◽  
Maximum Benefit ◽  
High Degree

SummaryThe fatigue life of a pin-jointed connection can be optimised by using a moderately high degree of interference between the loading pin and plate. Where a joint has to be assembled in confined conditions, difficulty may be experienced in inserting the interference-fit pin and one possible solution is to use a pre-assembled interference-fit bush in the plate, leaving only a light interference-fit pin to be pressed in on assembly of the joint. It is shown that a relatively thick bush of diametral ratio 4/3 will give a reduction in shear stress concentration factor for the plate comparable with that obtained with a solid pin, but that maximum benefit is not obtained with a thinner bush of diametral ratio 8/7. Where thin bushes are essential in order to maintain the ultimate tensile and fatigue strengths of the plate and /or the ultimate and fatigue strengths of the pin, the shear stress concentration factor for the plate is reduced as the modular ratio of bush to plate is increased and as the interference fit of the loading pin in the bush is increased.

Stress concentrations at an oblique hole in a thick flat plate under an arbitrary in-plane biaxial loading

1993 ◽  
Vol 28 (3) ◽  
pp. 223-235 ◽  
Author(s):  
P Stanley ◽  
B J Day
Keyword(s):  
Stress Concentration ◽  
Flat Plate ◽  
Biaxial Loading ◽  
Plate Thickness ◽  
Diameter Ratio ◽  
Hole Diameter ◽  
Stress Concentrations ◽  
Photoelastic Investigation ◽  
Concentration Factors ◽  
Stress Concentration Factors

The results of an extensive ‘frozen-stress’ photoelastic investigation of the stresses at isolated oblique holes in thick wide plates subjected to uniform uniaxial tension are used to provide stress concentration factors at holes resulting from any form of biaxial in-plane loading. The work covers plate thickness/hole diameter ratios from 1.3 to 3.0 and hole obliquity angles up to 60 degrees. Over these ranges the effects of changes in the plate thickness/hole diameter ratio are not of major importance but the effects of changes in the angle of obliquity are considerable.

On the Axisymmetrical Stress Concentration at an Eccentrically Reinforced Circular Hole in a Plate

1965 ◽  
Vol 16 (1) ◽  
pp. 15-32 ◽  
Author(s):  
W. H. Wittrick
Keyword(s):  
Stress Concentration ◽  
Circular Hole ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Dimensionless Parameter ◽  
Annular Plate ◽  
Infinite Extent ◽  
Non Linear

SummaryThis paper is concerned with the effectiveness of reinforcing a hole in a plate on one surface only. The particular problem considered is that of a circular hole in a plate of infinite extent, subjected to axially symmetrical tension at infinity, when the reinforcement consists of an annular plate on one surface. Because of the interaction between bending and stretching, the problem is highly non-linear and it has only been possible to solve it for certain limiting cases. The stress concentration factor depends on a dimensionless parameter proportional to the tension at infinity. It is shown that the stress concentration factor is increased, because of the eccentricity of the reinforcement, if the parameter is small, but for values of the parameter greater than a certain minimum the stress concentration factor is decreased. The results also make it quite clear that there is no possibility of obtaining reasonably accurate results by linearisation of the equations.

Effects of Perforation on the Collapsing Strength of Casing

2013 ◽  
Vol 395-396 ◽  
pp. 881-886
Author(s):  
Yu Guang Cao ◽  
Shi Hua Zhang ◽  
Xin Ren
Keyword(s):  
Stress Concentration ◽  
Flat Plate ◽  
Elasticity Theory ◽  
Stress Concentration Factor ◽  
Mechanical Model ◽  
Concentration Factor ◽  
Three Dimensional ◽  
Theoretical Equation ◽  
Fem Model ◽  
Strength Factor

In this study, three-dimensional mechanical model of the perforated casing was simplified as flat plate mechanical model. The theoretical equation for the calculation of collapsing strength factor for a perforated casing under squeeze was derived as per elasticity theory. Three-dimensional FEM model of a perforated casing was built using ANSYS and analysis was performed. The stress concentration factor (SCF) was discussed for perforated casing in this paper and the effects of aperture on SCFs were analyzed in detail.

scholarly journals Measurement of Stress Concentration Factor for Shoulder Fillet on Flat Plate under Axial Tension using Photoelasticity Method and FEA

2019 ◽  
Vol 8 (3) ◽  
pp. 8546-8556
Keyword(s):  
Stress Concentration ◽  
Flat Plate ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Loading Condition ◽  
Tensile Loading ◽  
Element Analysis ◽  
Axial Tension ◽  
The Finite Element Analysis ◽  
Tension Loading

Many researchers have made attempt to investigate stress concentration factor (SCF) for different discontinuities under different loading conditions and applications, but still failures of components take place which having discontinuities. Number of applications under which the components or parts working under tensile loading. Here, efforts are made to investigate the SCF of flat plate with shoulder fillet under axial tension loading using the approach of Photoelasticity for different D/d ratios. The Finite Element Analysis (FEA) approach used to validate the results of experimentation and found that the results are reasonably at acceptable level. One can utilize the outcome of this research for similar application having same discontinuity and loading condition.

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