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Investigation of stress-concentration factors in tensile strips

A photoelastic and numerical investigation has been carried out for different ratios of hole diameter to width of tensile strips

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Abstract

A photoelastic and a numerical investigation has been carried out to determine the stress-concentration factors at the edge of a central circular hole in a tensile strip for different ratios of hole diameter to width of the strip. The photoelastic data and the numerical results indicate that the stress-concentration factor at the minimum cross-sectional area tends to a value of two if the ratio of the hole diameter to the strip-width approaches a value of one.

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Abbreviations

A net :

minimum cross-sectional area of model (two ligaments), mm2

a :

hole diameter, mm

D :

diameter test disk, mm

f σ :

stress-fringe constant, N/fr-mm

h :

height of ligament, mm

k :

stress-concentration factor\(( = \sigma _{\max } /\sigma _{net} )\)

L :

length of model, mm

N :

fringe order, fr

P :

load, N

t :

thickness of model, mm

w :

width of model, mm

σ:

applied stress on gross area, N/mm2

\(\sigma _{\max }\) :

maximum stress, N/mm2

\(\sigma _{\min }\) :

minimum stress, N/mm2

\(\sigma _{net}\) :

nominal stress based on net area (=P/A net), N/mm2

References

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  2. Fuehring, H., “Stress Concentrations in Tensile Strips with large Circular Holes—Discussion,”Experimental Mechanics,13(6),255–256 (1973).

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  3. Hooke, C. J., “Numerical Solution of Plane Elastostatic Problems by Point-Matching,”Strain Analysis,3(2),109–114 (1968).

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  4. Koiter, W. T., “An Elementary Solution of Two Stress-Concentration Problems in the Neighbourhood of a Hole,”Qtly. of Appl. Math.,15,303 (1957).

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van Riesen, P.E., Spiering, R.M.E.J. Investigation of stress-concentration factors in tensile strips. Experimental Mechanics 15, 111–113 (1975). https://doi.org/10.1007/BF02320641

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  • DOI: https://doi.org/10.1007/BF02320641

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