An experimental study on the Charpy impact response of cracked aluminum plates repaired with GFRP or CFRP composite patches

Khalili, S.M.R.; Ghadjar, R.; Sadeghinia, M.; Mittal, Ravi Kant

doi:10.1016/j.compstruct.2008.07.032

Cited by 30 publications

(13 citation statements)

References 13 publications

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“…After preparing the patches were allowed for 48hrs curing before testing. the dimensions of the patches are 30 mm×10 mm dimensions are considered in such a way that notch is covered completely concerning Khallili et al [19] . the number of plies is considered based on fracture toughness values from mechanical testing.…”

Section: Methodsmentioning

confidence: 99%

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Mechanical behavior of patched steel panels at elevated temperatures

2019

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Preventive maintenance is an accepted practice in engineering to keep the structural reliability of ship hulls at the highest possible level. Designers ensure a longer period in between the consecutive maintenance of ship hull parts to optimize expenditure. This is relevant in view of the difficulty in reaching farthest corners in ballast tanks, fuel storage tanks, cofferdams etc. Prior maintenance of the deck and hull parts save a considerable amount of the owner’s budget.A portable technology like patching becomes more handy and economic. Performance of both unpatched and patched samples during dynamic loading conditions being examined in the present investigation. The high strength steel panels with a dimension of 70mm×15mm×3mm were edge cracked for lengths of 4mm and 7mm, with width of 1mm for both. The edge cracked high strength steel panels are repaired with composite patches using GFRP (glass fiber reinforced plastic), CFRP (carbon fiber reinforced plastic) and AFRP (aramid fiber reinforced plastic). The patching was done by 3 and 5 layered and impact tested by Charpy impact tester at ranges of high temperatures. The amount of energy absorbed in the impact is converted to dynamic fracture toughness values and compared for evaluating the performance of FRP (fiber reinforced plastics). Finite element analysis was done for evaluating the stress intensity factors at different types of patching and testing conditions. Comparatively the AFRP patched samples showed better dynamic fracture toughness values at different temperatures.

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Section: Methodsmentioning

confidence: 99%

“…Industries always had a concern towards the application of composites in impact testing because of these limitations. Different types of FrP used showed an impact on the energy absorption capacity of the repaired components [19,20] .the different number of patch layers an influenced improving energy absorption capacity.…”

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confidence: 97%

Mechanical behavior of patched steel panels at elevated temperatures

2019

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“…They also demonstrated that a nonalternating electric field applied to the patch could more effectively enhance the dynamic (pulse buckling) response of the beam. Khalili et al [9] investigated edge-cracked aluminum plates repaired with one-sided composite patches experimentally for their response to Charpy impact test. They observed that carbon patches are more effective in reinforcing the cracked plates than glass patches.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Charpy Impact Response of the Cracked Aluminum Plates Repaired with FML Composite Patches

Ghasemi

Vanani

Anaraki

2016

J Fail. Anal. and Preven.

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Fiber metal laminates (FMLs) are widely used in aerospace industries nowadays. Reparation of the cracks in these advanced materials was first done by some aeronautical laboratories in the early 1970s. In this study, experimental investigations were done on the effects of repairing the edge-cracked aluminum plates using the FML patches. The repairing processes were conducted to characterize the response of the repaired structures to the Charpy impact tests. The composite patches were made of one aluminum layer and two woven glass-epoxy composite layers. Three different crack lengths, crack angles, and patch lay-ups were examined. It was indicated that for the lengthen cracks, the effect of increasing the crack angle on energy absorption in the structure was more. When the ratio of crack length to the specimen width, i.e., a/w, is 0.5, the energy absorption per unit area of the specimens having different crack angles but the same patch lay-ups was so different. It was also observed that the percentage of the absorbed energy of 45°cracked angle specimens was about 25% higher than the 0°ones. Also it was observed that the lay-up of the patches and the place where the metal layer was embedded in the FML patches had an important effect on the impact response of the tested specimens. The more the metal layer of the patches is far from the interfacial surface of the aluminum plate and the FML patches, the less the energy absorbs in the structure.

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“…Khalili et al [23] conducted the Charpy impact test on edge-cracked aluminum plates repaired with one-sided composite patch. They noticed that the carbon patches have better characteristics than glass patches in reinforcing the cracked plates.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation in failure of cracked aluminum plates repaired with bonded FML composite patch, under impact loading

Vanani

Kashani

Anaraki

et al. 2013

Science and Engineering of Composite Materials

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Experimental and numerical investigation in failure of cracked aluminum plates repaired with bonded FML composite patch, under impact loading Abstract: In this paper, Charpy impact tests were conducted on cracked aluminum plates repaired with FML composite patches. The effects of the crack characteristics and patch lay-up sequence on the energy absorption of the specimens were investigated experimentally. In order to reduce the test numbers, the design of experiments method was used, and the results were predicted by response surface method. The effect of repairing on the fracture parameters [stress intensity factor (SIF), J-integral, and crack propagation direction (CPD)] at the crack front was calculated using three-dimensional (3D) finite element analysis. The results show that the value of the energy absorption increases when the crack angle increases and that the patch lay-up sequence has a significant role on the efficiency of the repair. When the location of the metal layer of the patch is near the repaired surface of the specimen, the value of the energy absorption increases.

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An experimental study on the Charpy impact response of cracked aluminum plates repaired with GFRP or CFRP composite patches

Cited by 30 publications

References 13 publications

Mechanical behavior of patched steel panels at elevated temperatures

Mechanical behavior of patched steel panels at elevated temperatures

A Study on the Charpy Impact Response of the Cracked Aluminum Plates Repaired with FML Composite Patches

Experimental and numerical investigation in failure of cracked aluminum plates repaired with bonded FML composite patch, under impact loading

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