Analysis of cracked aluminum plates repaired with bonded composite patches

Sun, C. T.; Klug, John C.; Arendt, C.

doi:10.2514/3.13073

Cited by 133 publications

(23 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decreasing shear modulus is disadvantage to reduce the stress concentration factor of the notched face sheet. Normally, the adhesive shear modulus is from 0.5 GPa to 1GPa [6][7][8]. The adhesive thickness is much thinner.…”

Section: Impact Of the Adhesive Thickness And Shear Modulusmentioning

confidence: 99%

Analysis on the parameters of adhesively bonding patch repairing cracked sandwich face panel

Wang

Tong

Zhu

2008

2008 Asia Simulation Conference - 7th International Conference on System Simulation and Scientific Computing

View full text Add to dashboard Cite

The parameters of adhesively bonding patch, which include patch materials, patch size, patch thickness, have been analyzed on the stress concentration factor and the stress intensity factor (SIF) thanks to the 3D finite element method (FEM) in the paper. The adhesive shear modulus and thickness are studied in this paper as well. The aluminum sandwich face panel is analyzed and the results show that the Boron/Epoxy composite patch reduces more stress concentration factor and SIF comparing with the other patches. The stress concentration factor reaches the minimum when the fiber orientates the tension direction. Meanwhile, the stress concentration in the patch and the adhesive reach the maximum. The stress concentration factor in the aluminum face sheet decreases with the increasing patch thickness. But the effect of the patch thickness weakens when the patch thickness is larger than the face panel. The impact of the adhesive thickness on the stress concentration of the face panel reduces with the increasing adhesive shear modulus. The stress concentration factor increases when the adhesive thickness increases. The results are useful to design the bonded composite patch repair.

show abstract

Section: Impact Of the Adhesive Thickness And Shear Modulusmentioning

confidence: 99%

Analysis on the parameters of adhesively bonding patch repairing cracked sandwich face panel

Wang

Tong

Zhu

2008

2008 Asia Simulation Conference - 7th International Conference on System Simulation and Scientific Computing

View full text Add to dashboard Cite

show abstract

“…Shear spring elements were used to represent the adhesive. In Sun et al 15 two‐dimensional Mindlin plate elements with transverse shear deformation capability were used to model both the cracked plate and the composite patch. Again shear spring elements were introduced to represent the adhesive.…”

Section: Finite Element Modelmentioning

confidence: 99%

Analysis of cracked steel members reinforced by pre‐stress composite patch

Colombi

Bassetti

Nussbaumer

2002

Fatigue Fract Eng Mat Struct

123

View full text Add to dashboard Cite

Pre-stress bonded composite patch is a promising technique to reinforce steel member damaged by fatigue. ifhe effectiveness of this technique was verified by fatigue tests on notched steel plâtes. Results showed that the application of carbon fibre reinforced plastic (CFRP) strips and, eventually, the introduction of a compressive stress by pretension of the CFRP strips prior to bonding produced a significant increment of the remaining fatigue life. In this paper, the stress intensiqr factor in the notched plates is computed by a two-dimensional finite element model in connection with the three-layer technique in order to reduce the computational effort. Due to high stress concentrâflon at the plate crack tip, debond is assumed at the adhesive-plate interface. The goal is to illustrate the influence of some reinforcement parâmeters such as the composite strip stiffness, the pre-stress level, the adhesive layer thickness and the size of the debonded region on the effectiveness of the composite patch reinforcement.Keyvords composite patch; fatigue crack reinforcement; parametric analysis.In Bassetti5 a novel technique was proposed to reinforce steel member damaged by fatigue. It consists in the appiication of carbon fibre reinforced plastic (CFRP) strips and, eventually, the introduction of a compressive stress by pretension of CFRP strips prior to bonding. Note that this new methodology applied to riveted steel members avoids the drawbacks of standard reinforcement techniques such as hole drilled at crack fiont, cover plates application, replacement of rivets by high strength bolts, cold expansion of the rivet hole and welding of the detected cracks. effectiveness of pre-stress CFRP-strips to stop fatigue crack emanating from the rivet hole or to prevent further cracking at other locations. The carbon fibre reinforced plastic laminates have physical and mechanical properties particularly interesting for reinforcement of fatigue damaged steel elements. The high fatigue resistance of CFRP avoids crack propâ-gation from the cracked steel section into the patch. The high stiffness of CFRP reduces the stress range in the cracked steel section and promotes crack bridging. llhe high tensile strength of CFRP allows also the application of a pretension to composite strips in order to increase the effectiveness of the bonded patch on thicker steel section. Finally, the low self-weight of CFRP plates limits the dead load increment and simplifies the strengthening operations. Composite patch reinforcement technique is a standard and reliable procedure in different engineering branches to reinforce structural elements subjected to extreme actions (high fatigue loads, high temperature ranges and exposure to aggressive agents) and nowadays, is also a standard reinforcement methodology in aircraft industries.T In fact the CFRP laminates is becoming a familiar procedure for O 2003 B ackwe I Publ sh ng Ltd. Fatigue Fract Engng Mater Struct 26, 59-66

show abstract

“…Several research studies have been conducted to analyse the stress redistribution at the crack tip of repaired structures, developing three-dimensional nite element analyses. Chue et al [1] and Sun et al [2] performed threedimensional nite element analyses and found the stress intensity factor of cracked plates when repaired with composite layers. Naboulsi and Mall [3] extended a three-layer model using Mindlin plate elements to evaluate the stress intensity factor of a cracked panel.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation of aluminium panels repaired with adhesively bonded composite laminates

Daghyani

Sayadi

Hosseini

2003

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

The fatigue crack propagation of aluminium panels when repaired with unidirectional glass bre composite laminates was investigated. The stress intensity factor at the crack tip of cracked panels repaired with single-sided and double-sided composite patches was evaluated by developing three-dimensional nite element models (FEMs). A particular surface preparation was used to bond the patches to the aluminium panels, resulting in a cohesive failure mechanism in the specimens. The results show that the stress intensity factor in the aluminium specimens was considerably decreased for double-sided repair, although for singlesided repair specimens the fatigue life was almost doubled compared with the specimens before repair.

show abstract

Analysis of cracked aluminum plates repaired with bonded composite patches

Cited by 133 publications

References 9 publications

Analysis on the parameters of adhesively bonding patch repairing cracked sandwich face panel

Analysis on the parameters of adhesively bonding patch repairing cracked sandwich face panel

Analysis of cracked steel members reinforced by pre‐stress composite patch

Fatigue crack propagation of aluminium panels repaired with adhesively bonded composite laminates

Contact Info

Product

Resources

About