New crack stop hole shape using structural optimizing technique

Fanni, Mohamed; Fouda, Noha; Shabara, Mohamed Ahmed Nasr; Awad, M.

doi:10.1016/j.asej.2015.02.010

Cited by 28 publications

(8 citation statements)

References 10 publications

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“…The physical implication is that placing a large circular hole at the crack tip would contribute to an extension of the life of the material. This result agrees with the numerical results found in [10,11] and [12].…”

Section: Effect Of Size Of the Circular Hole On The Stress Fieldsupporting

confidence: 93%

“…A survey of the techniques of evaluating the influence of the stop hole on the elastic fields show that experimental and numerical techniques have mostly been used while analytical methods have received less attention. For example, Matsumoto et al [10], Fanni et al [11], and Chen [12] used the finite element method to obtain an optimum crack breaker that gives maximum fatigue crack initiation life.…”

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confidence: 99%

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Closed form solution for a semi-infinite crack moving in an infinite orthotropic material with a circular crack breaker under antiplane strain

2022

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This study investigates the influence of a circular crack breaker on mode-III deformation behavior of a semi-infinite crack in a homogeneous, elastic orthotropic material subjected to longitudinal shear loads. The Galilean transformation is employed to convert the governing wave equation to Laplace’s equation which is time independent, rendering the problem amenable to analysis within the realm of the classical theory of two-dimensional elasticity. Considering the geometrical configuration of the problem, the analytical solution of the problem is possible if the problem is transformed using the appropriate mapping function. Our construction of a holomorphic function that maps the circular hole into a straight line with the edge terminating at the origin is a novelty which enables the use of integral transform method to obtain an analytic solution of the displacement, leading to closed-form expression for mode-III stress intensity factor, $$K_{111}$$ K 111 . The asymptotic values of the fields are obtained and shown to depend on the radius of the crack breaker. A parametric study shows that, for a fixed loading interval, a crack breaker of larger radius leads to increased stress intensity factor.

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Section: Effect Of Size Of the Circular Hole On The Stress Fieldsupporting

confidence: 93%

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confidence: 99%

Closed form solution for a semi-infinite crack moving in an infinite orthotropic material with a circular crack breaker under antiplane strain

2022

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“…Traditional strengthening methods, including welding, crack arresting hole, prestressing strengthening, and geometric have some drawbacks and limitations 2 . They may introduce new defects in the parent material, resulting in failure to assure the safety of the structures 3,4 . Carbon fiber‐reinforced polymer (CFRP) strengthening is one of the effective ways to enhance the fatigue behavior of steel structures 5 .…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Ke,

Chen,

Feng

et al. 2024

Polymer Composites

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Carbon fiber‐reinforced polymer (CFRP) is increasingly used to improve the fatigue behavior of damaged steel structures due to its advantages, including high strength and convenient processing. However, several issues, such as the effects of the adhesive property and CFRP arrangement, still need to be studied. In this study, a total of 20 single‐cracked steel specimens were tested under fatigue load, including two unstrengthened specimens, six single‐sided strengthened specimens, and 12 double‐sided strengthened specimens. The failure mode, fatigue life, crack propagation pattern, and interface damage development were obtained from experiments. The results show that epoxy resin structural adhesives (adhesives Araldite 420 and J133C) have the best bonding properties with CFRP. For the conventional epoxy adhesives, Araldite 420 and J133C can considerably improve fatigue life, which increased by more than 44.84 times to unstrengthened specimens. CFRP plate strengthening can significantly improve the fatigue life of single‐edge cracked steel plates. For the double‐sided strengthened specimens, the fatigue life can be improved by 6.93–44.84 times that of unstrengthened specimens. For the single‐sided, the fatigue life can be improved by 2.24–2.77 times. Properties of epoxy adhesive have a more significant effect on fatigue life compared to the thickness of the CFRP plate due to debonding.Highlights Ductile epoxy adhesives are most conducive to improving the fatigue behavior of CFRP strengthened steel plates. The fatigue life of steel plates can be improved by increasing the thickness of CFRP plates and using double‐sided CFRP strengthening. Interface debonding is the main failure mode of CFRP plates strengthening single‐edge cracked steel plates under fatigue.

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“…The crack arrest behaviour of the stop-holes can be improved through optimizing the hole shape [ 21 ] and the arrangement, and by adjusting from the flank hole in front of the crack tip [ 22 ] to symmetric crack flank holes along the crack flanks [ 23 ] with different hole position. For example, Lu et al [ 24 ] studied the fatigue crack growth behaviour with the pure stop-hole effect and the combination of stop-hole and overload.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Fracture Behaviour for Cracked Joints in Corrugated Plate Girders Repaired by Stop-Holes

Wang

Zhou²,

Wang

et al. 2023

Materials

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The efficient crack eliminated stop-hole measure was proposed to repair and reduce the stress concentration associated fracture risk of the corrugated plate girders by setting it at the critical joint of flange plate with tightened bolts and gaskets under preloading. To investigate the fracture behaviour of these repaired girders, parametric finite element analysis was conducted, focusing on the mechanical feature and stress intensity factor of crack stop-hole in this paper. The numerical model was verified against experimental results first, and then the stress characteristics due to the presence of crack open-hole were analysed. It was found that the moderate-sized open-hole was more effective than the over-sized open-hole in the reduction of stress concentration. For the model with prestressed crack stop-hole through bolt preloading, the stress concentration was nearly 50% with the prestress around open-hole increased to 46 MPa, but such a reduction is inconspicuous for even higher prestress. Relatively high circumferential stress gradients and the crack open angle of oversized crack stop-holes were decreased owing to additional prestress effects from the gasket. Finally, the shift from the original tensile area around the edge of the crack open-hole that was prone to fatigue cracking to a compression-oriented area is beneficial for the reduction of stress intensity factor of the prestressed crack stop-holes. It was also demonstrated that the enlargement of crack open-hole has limited influence on the reduction of stress intensity factor and crack propagation. In contrast, higher bolt prestress was more beneficial in consistently reducing the stress intensity factor of the model with the crack open-hole, even containing long crack.

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New crack stop hole shape using structural optimizing technique

Cited by 28 publications

References 10 publications

Closed form solution for a semi-infinite crack moving in an infinite orthotropic material with a circular crack breaker under antiplane strain

Closed form solution for a semi-infinite crack moving in an infinite orthotropic material with a circular crack breaker under antiplane strain

Fatigue performance of carbon fiber‐reinforced polymer strengthened single‐edge cracked steel plates: Effects of adhesive property and CFRP arrangement

Numerical Analysis of Fracture Behaviour for Cracked Joints in Corrugated Plate Girders Repaired by Stop-Holes

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