Investigation of stress field parameters in a cracked stiffened plate under mixed mode I/II

Document Type : Research Paper

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Abstract

Thin reinforced plates are utilized widely in many fields of engineering industries. Existence of crack is an important factor of failure in such structures, which can lead to structural damage in less time than its real function without the crack. In this paper, stress intensity factors for mode one and mode two of fracture are studied in isogrid thin plate reinforced with diamond lattice and stiffeners with T-shaped cross section under uniaxial and biaxial loading conditions to find the difference with simple plates. The rectangular reinforced plate has 12 stiffener ribs with angle of 60 degrees regarding to transverse axis. In order to model the reinforced sheet, plates and stiffeners are assembled together uniformly. Modeling and analysis are performed using Abaqus finite element software; and the effect of various parameters such as length and angle of the crack and also, the different loading conditions on stress intensity factors in reinforced lattice plane are investigated. The results show that each of the investigated variables has a significant impact on stress intensity factors. Also, by changing the angle of crack or at different loading conditions, the stress intensity factors can have negative values in lattice reinforced thin plate.

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References

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Aerospace Knowledge and Technology Journal
Volume 5, Issue 2 - Serial Number 2
October 2016
Pages 93-107

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