A boundary element method for stress reduction by optimal auxiliary holes

Ulrich, T.W.; Moslehy, F.A.

doi:10.1016/0955-7997(95)00025-j

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…Providakis and Sotiropoulos [5] solved the stress concentration problem by introducing auxiliary holes in the loading direction, their results show that decreasing the distance between the original hole and the auxiliary hole can reduce the stress concentration, but at the same time increases the stress concentration at the auxiliary hole. Similar work was done by Ulrich [6] earlier to reduce the stress concentration by introducing optimally sized and placed circular holes.…”

Section: Introductionmentioning

confidence: 85%

On Reduction of Stress Concentration around the Pin Hole in Turbine Discs

Shi

Wang

Yuan

et al. 2013

AMM

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The stress concentration phenomenon around holes in rotated components is discussed. Firstly, finite element analysis of a simplified model of turbine disc flange is carried out, and then a method is developed by designing an intended-cut notch on the model to reduce the stress around the pin hole. Furthermore, two characteristic parameters which determine the configuration of the notch, namely notch depth and arc length parameter, are investigated by changing the notch dimensions. The results show that this method can reduce the stress around the hole significantly, notch depth and arc length have an important impact on the stress concentration factor (SCF), the SCF decreases with the increase of notch depth, and increasing the arc length within a critical scope results in the decrease of the SCF.

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Section: Introductionmentioning

confidence: 85%

On Reduction of Stress Concentration around the Pin Hole in Turbine Discs

Shi

Wang

Yuan

et al. 2013

AMM

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“…To ensure convergence and to obtain accurate results, a gradual change in the element size is employed. Therefore, smaller elements are used near the points of stress concentrations while larger elements are utilized far Ulrich and Moslehy [9] Tension Reduces the SCF (stress concentration factor) up to 3.0 for the ellipse from the high stress areas. Also, the size of elements is decreased until changes in the results of well-known cases are less than 1 per cent.…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…Naik et al [8] optimized the hole shapes in beams under pure bending. Ulrich and Moslehy [9] and Providakis et al [10] used boundary element methods to reduce stress concentration in plates by introducing optimal auxiliary holes.…”

Section: Introductionmentioning

confidence: 99%

Design of a defence hole system for a shear-loaded plate

Akour

Nayfeh

Nicholson

2003

The Journal of Strain Analysis for Engineering Design

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Stress concentrations associated with circular holes in pure shear-loaded plates can be reduced by up to 13.5 per cent by introducing elliptical auxiliary holes along the principal stress directions. These holes are introduced in the areas of low stresses near the main circular hole in order to smooth the principal stress trajectories. A systematic study based on univariate search optimization method is undertaken by using finite element analysis (FEA) to determine the optimum size and location for an auxiliary defence hole system. The results are validated using RGB (red-green-blue) photoelasticity.

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“…Naik et al [1986] optimized the hole shapes in beams under pure bending. Povidakis [1993] and Ulrich and Moslehy [1995] used boundary element methods to reduce stress concentration in plates by introducing optimal auxiliary holes. Duchek et al [1998] have demonstrated the effectiveness of stiffeners fastened on either side of a hole or cutout in a flat plate loaded in tension.…”

Section: Introductionmentioning

confidence: 99%

Defense Hole Design for a Shear Dominant Loaded Plate

Akour

Nayfeh

Nicholson

2010

Int. J. Appl. Mechanics

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Baseline data is produced for designing an optimum Defense Hole System (DHS) for a large plate with a circular hole in shear dominant-load range. Stress concentration associated with circular holes for tensile/shear ratio ranging from 0% to 25% is reduced by 13.5% to 16.67%, respectively. This reduction is achieved by introducing auxiliary elliptical holes (i.e., DHS) along the principal stress directions. Each pair lies along the same principal direction has the same geometry and placement on either side of the main hole. These holes are placed in the low stress regions. With such reduction in the maximum stress level, the improvement in fatigue life of a structural part can be very significant. Both redesign optimization and parametric optimization techniques are utilized to reach the optimum solutions and to generate the baseline data. Finite Element Analysis (FEA) is used to evaluate the stresses and to optimize the size and location of the DHS. The optimum cases are validated using the RGB-photoelasticity technique. Three main goals are achieved by introducing such holes: maximum stress reduction, working as crack arrest in case a crack propagates, and material reduction.

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A boundary element method for stress reduction by optimal auxiliary holes

Cited by 12 publications

References 12 publications

On Reduction of Stress Concentration around the Pin Hole in Turbine Discs

On Reduction of Stress Concentration around the Pin Hole in Turbine Discs

Design of a defence hole system for a shear-loaded plate

Defense Hole Design for a Shear Dominant Loaded Plate

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