Arrestment of cracks in plane extension by local reinforcements

Zacharopoulos, D. A.

doi:10.1016/s0167-8442(99)00038-5

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…Cracked structural components which present flat shapes can be simply repaired by using bonded overlay patches which can easily be applied in situ and moreover (mainly by reducing the stress field in the critical zones) with the beneficial effect to improve the mechanical resistance and increase fatigue life (Liu et al, 1997;Ting et al, 1999;Davis and Bond, 1999;Zacharopoulos, 1999;Belhouari et al, 2004). Nevertheless 0020-7683/$ -see front matter Ó 2006 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Patch repair design optimisation for fracture and fatigue improvements of cracked plates

Brighenti

2007

International Journal of Solids and Structures

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The problem of improving fracture and/or fatigue life of structural components by means of patch repairs is addressed in the present paper by applying a biology-based method, known as the Genetic Algorithm. The optimum design procedure consists in evaluating the patch topology, to be applied to the highest stressed region, which maximises the fracture resistance or the expected fatigue life of the improved structural component by keeping constant the total patched area (constrained optimisation problem). The proposed procedure is implemented in a finite element code and some numerical simulations are carried out in order to assess its reliability. The method is applied to two simple cases of cracked plates under pure Mode I or Mode II: for such analysed configurations, the method allow to improve significantly the fracture or fatigue behaviour of structural components repaired by employing the optimised shape patches instead of a simple shape (e.g. square or rectangular) patches.

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Section: Introductionmentioning

confidence: 99%

Patch repair design optimisation for fracture and fatigue improvements of cracked plates

Brighenti

2007

International Journal of Solids and Structures

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“…Nowadays, the crack arrest methods used in engineering metal structures include: (a) welding the cracks, (b) drilling crack-stopping holes around the tips of cracks [2,3], (c) externally bonding a patch over the whole area of the crack surface [4,5], and (d) externally bonding a reinforcement patch near crack tips [6]. The effectiveness of the four methods above is different in arresting the continuous spreading of cracks temporarily.…”

Section: Introductionmentioning

confidence: 99%

“…The effectiveness of reinforcement patches can be evaluated by recording the level of reducing stress intensity factors or energy. Usually, two kinds of patches are used for this purpose, namely rectangular patches and semiannular patches [6]. Studies in this paper will concentrate on rectangular patches bonded to a single side of the cracked plate.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the effective position of a reinforcement patch used as crack arrest for plates with mixed-mode (I/II) cracks

Wang

Cui

2008

Proceedings of the Institution of Mechanical Engineers, Part M:

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Rectangular patches are usually used as the temporary crack stoppers ahead of the tips of macro cracks. As mixed-mode cracks are usually initiated in engineering structures, the relative position of reinforcement patches to crack tips should be carefully considered. There will be many directions around crack tips for allocating reinforcement patches and the effectiveness of reinforcement patches should be quite dependent on their allocation positions, which can be expressed by the distance between the crack tip and patch, and also the direction of the patch relative to the crack line. The present paper will aim to examine the proper position for allocating the reinforcement patch by comparing the reduction level of the stress intensity factors. Finite element analysis will be conducted for this purpose. The optimum position for allocating the reinforcement patch will be determined, which will be further compared with crack propagation direction determined by strain energy density theory for an elastic cracked body. The conclusion is drawn that the patch with proper stiffness should be allocated in the direction of initial crack propagation near the crack tips. Its effectiveness will not be satisfactory when allocated away from the region.

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2017

Handbook of Structural Life Assessment

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Arrestment of cracks in plane extension by local reinforcements

Cited by 9 publications

References 11 publications

Patch repair design optimisation for fracture and fatigue improvements of cracked plates

Patch repair design optimisation for fracture and fatigue improvements of cracked plates

Analysis on the effective position of a reinforcement patch used as crack arrest for plates with mixed-mode (I/II) cracks

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