Peterson's Stress Concentration Factors

Pilkey, Walter D.; Pilkey, Deborah F.

doi:10.1002/9780470211106

Cited by 477 publications

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“…Also as shown in Figure 2b, the tip radius was, ρ = 0.1 mm, while the theoretical stress concentration factor, k t , was determined from Peterson's stress concentration factors [1] to be k t = 4.71. Fatigue notch factor, k f could also be calculated from the empirical estimates by using the following equations:…”

Section: Notch Sensitivity Q Nmentioning

confidence: 99%

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Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Rahmat¹,

Ibrahim²,

Oskouei³

2013

ujme

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In this study, stress raisers (notches, fretting fatigue and a combination of notch and fretting) were taken into consideration as to its performance in reducing fatigue life. Reduction factor measurements using fatigue sensitivity, q as an effect of the respective stress raiser on fatigue lives were done. Finite element analyses on the consequence of clamping pressure on a notched geometry revealed a further increase in stress concentration at the notch tip for this specific geometry. However, fatigue tests revealed no significant difference in the fatigue lives between the notched and the combined notch and fretting fatigue. Fatigue notch sensitivity, q n was found to be between 0.42 and 0.65 while a fretting notch-like sensitivity, q f calculated from fretting fatigue results using a method by Wharton et al were 3.52 and 3.28 at torque levels 20 Nm and 50 Nm respectively. It was found that the stress concentration factor, k t for the fretting condition was conservative in its value and did not correlate well with the actual fretting reduction factor, k f . Finally, fractorgraphic analysis revealed significant wear for both fretting fatigue specimens and the combined notch and fretting fatigue. However, cracks were only found to originate from the notch tip for the combined notch and fretting fatigue at all alternating stress levels.

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Section: Notch Sensitivity Q Nmentioning

confidence: 99%

“…The first 'stress raiser' is a typical notch [1]. Notches are notorious for influencing the stress distribution in producing high localised stresses.…”

Section: Introductionmentioning

confidence: 99%

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Rahmat¹,

Ibrahim²,

Oskouei³

2013

ujme

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“…The analytical equation of Stress Concentration Factors Scu for uniaxial and Scs shear load are respectively (Pilkey and Pilkey, 2008):…”

Section: Simplified Estimates Using An Equivalent Ellipsementioning

confidence: 99%

Stress concentration around perforations produced by corrosion in steel storage tanks

Godoy

Boccardo

Rodríguez

et al. 2014

Lat. Am. j. solids struct.

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This paper presents numerical results of stress concentration factors for plates perforated by corrosion. Evidence from 25 plates with corrosion perforation considered show that typical shapes may be characterized as a deviation from an ellipse or from a circle. In order to model typical perforations created by this type of corrosion, holes with non-circular boundaries have been considered in the form of cosine shape and variations from it. Two load cases are investigated: uniaxial and shear stress fields in an elastic plane stress problem. The influence of the amplitude of deviation with respect to an ellipse or circle and the local curvature of the internal boundary of the hole are studied. A simplified model of an equivalent ellipse originally proposed by Nishida is shown to provide good estimates for stress concentration factors for a range of shapes induced by corrosion.

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“…These stress concentrations are the key issue regarding the bearing capacity due to the brittle failure mode of glass. Known stress concentration factors are not applicable because of the laminate structure of the glass beam and the non-homogeneous cross section (see Pilkey and Pilkey 2008).…”

Section: Introductionmentioning

confidence: 99%

Load-bearing behavior of spliced glass beams under bending action

Ringli

Vogel

2016

Glass Struct Eng

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The load-bearing behavior of spliced structural glass beams under bending action is investigated using FE simulations. Since geometric singularities occur in spliced structural glass beams, stress concentrations arise, which are the key issue regarding the bearing capacity due to the brittle failure mode of glass. FE simulations show that stress concentration factors of more than 2.6 may occur within the cross section of spliced joints. Furthermore, the simulations show that these stress concentrations highly depend on the stiffness of the interlayer material, which in turn strongly depends on the temperature and the load duration. In case of low interlayer stiffness, the stress concentrations are low as well, but the zone of influence of a joint is large. In case of a high interlayer stiffness, the zone of influence of a joint is small and therefore, the force in the spliced pane has to be transferred in a small area leading to high stress concentrations. Consequentially, different load scenarios with different assumptions regarding the stiffness of the interlayer material, have to be considered in order to get a safe design. In addition, an interaction of neighboring joints cannot be excluded and therefore, a simulation of the entire structure is strongly recommended. Optimized joint designs, such as thinner outer panes or the use of an intermediate pane, significantly reduce the stress concentrations in case of outer spliced joints. However, thinner R. Ringli (B) ETH Zurich, Institute for Structural Engineering (IBK), Zurich, Switzerland e-mail: ringli@ibk.baug.ethz.ch outer panes lead to higher stress concentrations in inner spliced joints, which may result in a relocation of the critical stress concentration within the beam.

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Peterson's Stress Concentration Factors

Cited by 477 publications

References 0 publications

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Stress concentration around perforations produced by corrosion in steel storage tanks

Load-bearing behavior of spliced glass beams under bending action

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