Stress concentration analysis for countersunk rivet holes in orthotropic plates

Darwish, Feras H.; Tashtoush, Ghassan; Gharaibeh, Mohammad A.

doi:10.1016/j.euromechsol.2012.04.006

Cited by 41 publications

(21 citation statements)

References 18 publications

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“…As noted earlier, the amount of work on understanding stress/strain concentrations in scarfed composite laminates is very limited. As described previously, Darawish et al (28,29) is one of a few researchers to study stress concentrations ( Figure 1a). Darawish et al concluded that a stress concentration factor in an orthotropic composite laminate may be expressed using…”

Section: Existing Methodsmentioning

confidence: 93%

“…Although the method provided in (28) was successfully applied to small holes (of the order of a typical aerospace fastener with diameter 6.41 mm and countersunk angle of 45 o ), for shallow scarf angles significant coupling effects are possible and an alternative modelling approach is required. A greater scarf angle results in greater material removal and thinner more compliant laminates over greater areas.…”

Section: Existing Methodsmentioning

confidence: 99%

“…Darwish et al (28,29) carried out numerous FEA studies on orthotropic plates having countersunk holes. In the investigation the effect of countersunk size, plate thickness, and plate dimensions were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the influence of laminate stacking sequence on strain/stress concentrations in thin laminates at repair holes with large scarf angles

Damghani

Bakunowicz

Murphy³

2019

Journal of Composite Materials

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Scarf repair is widely used in the restoration of structural performance of damaged aircraft secondary structures. Such repairs result in reduced thickness sections which are significantly larger than those associated with typical fastener holes. Significant literature exists on the distribution of strain/stress concentration in fastener hole geometries, both straight sided and countersunk, but is lacking for the geometries associated with shallow scarf angles and thin laminates. Hence, herein three-dimensional finite element models are developed to understand the influence of stacking sequence and scarf angle on strain/stress concentrations. The results demonstrate and quantify for the first time that strain concentrations are not only dependant on the laminate membrane stiffness but also on laminate bending stiffness, due to the anisotropy created as a result of scarfing angle, hole geometry and laminate thickness. Scarfing is demonstrated, for typical repair geometry associated with foreign object damage (hole diameter 20 mm, scarf angles 3° to 7°), to elevate strains by up to 2.5 times when compared to equivalent diameter straight-sided holes in laminates of thickness ≈1 mm.

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Section: Existing Methodsmentioning

confidence: 93%

Section: Existing Methodsmentioning

confidence: 99%

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Understanding the influence of laminate stacking sequence on strain/stress concentrations in thin laminates at repair holes with large scarf angles

Damghani

Bakunowicz

Murphy³

2019

Journal of Composite Materials

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“…The model also called as two dimensional solid model used for plane stress analysis. Darwish et al (2013) used the quarter two dimensional model in order to determine stress concentration for countersunk rivet holes in orthotropic plates [26]. Pilkey (2008) also summarized and reported that nnumerous studies on the stress concentration of two dimensional (2-D) plates with circular holes subjected to several loading types [27].…”

Section: Fig 4 Stress Distribution Over the Cross Sectional For Tensmentioning

confidence: 99%

Simulation of Tensile Stress Concentration Evaluation using Finite Element Performance

Salleh*¹,

Islam²,

Epaarachchi³

2019

IJITEE

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This paper present the investigation on tensile behavior of syntactic foam using finite element analysis (FEA). Tensile properties which is important to discover especially for isotropic materials such syntactic foam. Different weight percentage (wt.%) of glass microballoon might be effected on developing of stress concentration (Kt) their stress on surface area. Comparative study on tensile syntactic foam using FEA approach was not explored yet. Hence, it is showed that the stress concentration more sensitive impact on lower modulus elasticity compared to the higher elasticity for syntactic foam

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“…Their simulation results showed that the stress concentration is commonly located at the sinking edge of the hole and they further used the numerical data to formulate an empirical formulas to mathematically compute t K in countersunk holes based on the geometry of the hole. Later, Gharaibeh et al [15] and Darwish et al [16,17] provided improved formulas for the SCF in countersunk holes in isotropic and orthotropic plates subjected to uniaxial tensile loadings. Hayajneh et al [18] and Bhargava et al [19] investigated the strain concentration factor (SeCF) in countersunk holes under uniaxial tension.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Stress Concentration Factor Induced in Double Countersunk Holes Due to Uniaxial Tension

Gharaibeh

2020

International Journal of Applied Mechanics and Engineering

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Finite element and response surface methods were utilized to investigate the stress concentration factor induced in isotropic rectangular plates with two identical countersunk rivet holes due to uniaxial tension. In this investigation, the finite element model was constructed using ANSYS software and used to produce stress concentration factor (SCF) data. Additionally, the response surface method (RSM) was implemented to characterize the influence of the problem geometric parameters on the SCF. Besides, RSM combined with least squares regression methods were employed to formulate a simple and effective equation to mathematically compute the stress concentration factor (Kt) value. This equation was consequently verified with finite element analysis (FEA) results. Lastly, an optimum plate and holes configuration that minimizes the SCF was suggested and hence recommended.

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Stress concentration analysis for countersunk rivet holes in orthotropic plates

Cited by 41 publications

References 18 publications

Understanding the influence of laminate stacking sequence on strain/stress concentrations in thin laminates at repair holes with large scarf angles

Understanding the influence of laminate stacking sequence on strain/stress concentrations in thin laminates at repair holes with large scarf angles

Simulation of Tensile Stress Concentration Evaluation using Finite Element Performance

A Study on the Stress Concentration Factor Induced in Double Countersunk Holes Due to Uniaxial Tension

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