The effects of stacking sequence on drilling machinability of filament wound hybrid composite pipes: Part-1 mechanical characterization and drilling tests

Gemi, Lokman; Köklü, Uğur; Yazman, Şakir; Morkavuk, Sezer

doi:10.1016/j.compositesb.2020.107787

Cited by 92 publications

(38 citation statements)

References 67 publications

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“…Hybrid laminates in different stacking sequences will exhibit different failure forms when bent. [31,33,34] Except for the Epoxy-PC-Epoxy laminates, the other hybrid laminates show typical flexural failure mode, with compression at the top and tension at the bottom. The phenomenon of delamination failure is basically invisible.…”

Section: Resultsmentioning

confidence: 99%

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

et al. 2020

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Carbon fiber (CF) hybrid laminates with excellent mechanical properties have attracted great attention. Herein, CF reinforced epoxy/polycarbonate (CF/Epoxy/ PC) hybrid laminates are fabricated via laser surface processing and hot-pressing technique. Several mechanical tests, including uniaxial tensile, flexural, and impact, are conducted to assess the effect of stacking sequence on the prepared hybrid laminates. In addition, failure behaviors and morphologies are observed to analyze the interaction mechanism between the two laminates. Experimental results indicate that the tensile properties of hybrid laminates conform to the rules of mixture. The best flexural properties and impact peak force are found in Epoxy-PC hybrid laminates. However, due to the transfer phenomenon of flexural point during the impact process, PC-Epoxy hybrid laminates possess the best impact energy absorption. Furthermore, the introduction of CF/PC laminates greatly mitigates the out-of-plane fracture process of CF/Epoxy laminates during a flexural test. However, its in-of-plane fracture area has a further increase during the impact process, which illustrates the synergetic enhancement ability of hybrid laminates.

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Section: Resultsmentioning

confidence: 99%

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

et al. 2020

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“…It can seen from these figures that both analytical and finite element (FE) results can successful predict the elastic region of the pultruded GFRP. The composite structures produced in different production methods and geometries are subjected to damage analysis after the experimental study [28][29][30][31][32][33]. Each type of composite materials has their own unique damages.…”

Section: Fig 4 Numerical Model 5 Resultsmentioning

confidence: 99%

An Investigation on Static Analysis of Pultruded GFRP Composite Beams

Madenci

Özkılıç

Gemi

2020

Academic Platform Journal of Engineering and Science

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Composite materials, which have been used especially in the construction sector to strength beams and columns, have been produced in pultruded GFRP profiles with different geometries with the pultrusion method. Pultruded GFRP profiles are an alternative to traditional building elements in many construction applications thanks to their superior properties such as high strength, chemical resistance, thermal and electrical insulation. Pultruded GFRP profiles are exposed to various loads and change shapes due to the effect of these loads. It is very important to determine the load and deformation capacities as structural members. These profiles are often exposed to bending while serving as beams. In this study, a multiscale analysis of the deflection and stress behavior of pultruded GFRP composite beam is presented. The proposed formulations are verified using the results of experimental and numerical studies. The comparison of the analytical results to both experimental and finite element results revealed that the differences between analytical results and the experimental and numerical findings are less than 1%, which indicates an excellent agreement.

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“…Also, after any increment of hole-drilling, the proper time for strain relaxation and cooling specimens has been considered. Drilled specimens inevitably suffer from damages caused by drilling process; 34–36 to deal with this fact, the researchers manufactured and drilled more specimens and then rejected some of them whose damages was excessive. The excluding process has been conducted using the optical microscope and the criteria was damage intensity.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Amir-Ahmadi

Ghasemi

2020

Journal of Composite Materials

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This study employs numerical and experimental approaches to analyze effects of various filament-winding parameters, including mandrel diameter and cooling conditions, on the process-induced thermal residual stresses of composite and nanocomposite pipes. Simultaneous effects of the addition of multi-walled carbon nanotubes (MWCNTs) and the cooling conditions were also analyzed in detail. To accomplish this aim, a few composite and nanocomposite cylinders with various diameters in different cooling conditions were produced using filament-winding process and experimented. The incremental hole-drilling method using an integral inverse solution was employed for measuring the curing-induced residual stresses. The experimental findings confirm that using MWCNTs for reinforcing the matrix, choosing a slow cooling condition, and increasing the diameter generate less residual stresses during the process. Moreover, this study clearly showed that the addition of MWCNTs decreases the sensitivity of the structure to the effects of cooling conditions during the curing process. Therefore, finding optimum amounts of MWCNTs and cooling rate leads to the minimum cost of fabrication.

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The effects of stacking sequence on drilling machinability of filament wound hybrid composite pipes: Part-1 mechanical characterization and drilling tests

Cited by 92 publications

References 67 publications

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

Impact and Flexural Properties Studies on Carbon Fiber Reinforced Epoxy/Polycarbonate Hybrid Laminates with Different Stacking Sequence

An Investigation on Static Analysis of Pultruded GFRP Composite Beams

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

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