Bolted joints in quasi-unidirectional glass-fibre NCF composite laminates

İnal, Oğuzcan; Balıkoğlu, Fatih; Ataş, Akın

doi:10.1016/j.compstruct.2017.05.075

Cited by 14 publications

(12 citation statements)

References 24 publications

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“…C-3 elyaf sıralamasına sahip 3 Nm sıkma torklu cıvata bağlantılı cam KE/epoksi ve pim bağlantılı cam KE/epoksi Şekil 6. C-1 [90°/0°] s elyaf sıralamasına sahip i) pim bağlantılı HTS40/977-2 karbon fiber/epoksi [16], ii) pim bağlantılı cam KE/epoksi ve iii) 3 Nm sıkma torklu cıvata bağlantılı cam KE/epoksi [19,26] plakalarda hasar (Damage in C-1 [90°/0°]s stacking sequence for i) pinned joint of HTS40/977-2 carbon fibre/epoxy [16], ii) pinned joint of glass NCF/epoxy and iii) 3 Nm torqued bolted joint of glass NCF/epoxy [19,26]) [19,26] plakalarda hasar.…”

Section: C-3 [90°/0°] 2s Elyaf Sıralaması (C-3 [90°/0°]2s Stacking Sequence)unclassified

“…Bu konuda, cıvata bağlantılarındaki hasar ve bu hasarın sonlu elemanlar yöntemiyle modellenmesi yazarlar tarafından incelenmiştir. Çalışmada yaygın kullanılan modelleme ve hasar analizi yöntemlerinin KE takviyeli kompozitler için de uygulanabilir olduğu görülmüştür [19]. Bu çalışmanın temel amacı ise pim bağlantılı KE takviyeli kompozit plakaların hasar mekanizmalarının belirlenmesi ve hem aynı malzemenin cıvata bağlantılı konfigürasyonuyla karşılaştırılması hem de klasik prepreg sistemine sahip tekyönlü kompozitlerle karşılaştırılmasıdır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

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Kıvrımsız cam elyaf takviyeli kompozit plakalarda pim bağlantılarının deneysel olarak incelenmesi

İnal¹,

Ataş²

2018

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Damage mode and mechanisms of pinned joints in quasiunidirectional glass NCF composite layups were investigated  Cross-ply layups of this particular material system were less sensitive to the lateral support provided by bolt clamping force.  Initial damage starts at the 0° bundles as a fibre micro-buckling mode. Figure A. Pin joint test results of glass non-crimp fabric (NCF) composite plates. Purpose:The main goals of this study were to observe the damage mode and measure the strength of pin joints in selected quasi-unidirectional glass NCF composite layups and provide recommendations for their optimum design. Theory and Methods:The specimen preparation and the mechanical tests were conducted according to the ASTM D-5961 standard test method. Damage analysis of tested specimens was carried out by optical micrography and transparent light photography. Results:The results of pinned joint tests are shown and compared with bolted configurations of the same layups in the Fig.A. The pin joint strength was decreased for all layups due to the lack of lateral support provided by the bolt head and nut. However, the cross-ply layups were less sensitive to the lateral support in comparison to the quasi-isotropic layups. It was observed that the major cause of the damage initiation was fibre micro buckling at the 0° bundles due to their significantly low compressive strength. In crossply layups, the 90° bundles restricted the buckling of the 0° bundles by acting as a lateral support. Also, stacking of the plies in the same direction together resulted in a lower resistance against the bundle buckling. Conclusion:The mechanical performance of the pinned joints of the quasi-unidirectional NCF composites was evaluated experimentally including basic imaging techniques. The results showed that the cross-ply layups have a better performance against pin loading in comparison to the quasi-isotropic layups.

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Section: C-3 [90°/0°] 2s Elyaf Sıralaması (C-3 [90°/0°]2s Stacking Sequence)unclassified

Section: Gi̇ri̇ş (Introduction)unclassified

Kıvrımsız cam elyaf takviyeli kompozit plakalarda pim bağlantılarının deneysel olarak incelenmesi

İnal¹,

Ataş²

2018

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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“…15 The damage mechanism has also been studied for non-crimp laminates subject to fatigue using digital image correlation 16 and for bolted joint NCF both experimentally and by FE modelling. 17,18 Moreover, compression on quasi-isotropic NCF laminates as a function of the stacking sequence 19 and as a function of waviness on unidirectional NCF 20 has been investigated. Some authors extended the characterization to more complex stress types, considering combinations of compressive and shear loads.…”

Section: Introductionmentioning

confidence: 99%

“…Damage on non‐crimp fabrics composites loaded in tension has been investigated by Edgren 15 . The damage mechanism has also been studied for non‐crimp laminates subject to fatigue using digital image correlation 16 and for bolted joint NCF both experimentally and by FE modelling 17,18 . Moreover, compression on quasi‐isotropic NCF laminates as a function of the stacking sequence 19 and as a function of waviness on unidirectional NCF 20 has been investigated.…”

Section: Introductionmentioning

confidence: 99%

A non‐crimp fabric mechanical characterization for the production of aerospace components

Lepore

Ferrante

Sanguigno

et al. 2021

Mat Design & Process Comms

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“…Experimental testing and numerical modeling have been provided valuable insight to the behavior of bolted joint in composite structures by many investigators [9,[13][14][15][16] and is the subject of the present work. Hyer et al [13] investigated the effects of pin elasticity, clearance and friction on the stress state of pin-loaded joints.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Finite Element Analysis of Bolt-Hole Clearance Effects in Composite Joints

Khashaba

Sebaey

Selmy

2018

The International Conference on Applied Mechanics and Mechanica

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Bolt-hole clearance effects on bearing strength of bolted joints in cross-ply, [0/90] 2s , glass fiber reinforced epoxy (GFRE) composites, were investigated experimentally and numerically. A series of ASTM tests (tensile, compressive and shear) were conducted on a unidirectional laminates to find the lamina properties, which were used as input to a 3D developed progressive damage model (PDM). The model was built with the aid of ABAQUS software, nonlinear Hashin failure criteria and Riccio property degradation rules. The PDM was used to predict the failure load and mode of composite bolted joint with bolt-hole clearance of 0, 50, 100, 200, 300 µm. Bearing strength was determined according to three different criteria: load at 4% hole deformation, first peak load and ultimate load. The numerical results of the ultimate strength agree well with the experimental ones with a maximum deviation of 7.1 %. Increasing the bolt-hole clearance from 0 to 300 µm reduces the contact area by 17.8% and increasing the contact pressure by 26.6 %. Accordingly, the 4% HDS, first peak bearing strength, the measured ultimate strength and the predicted ultimate strength were decreased respectively by 20.9%, 34.0%, 14.2% and 8.8%. On the other hand, the failure mode did not affected by increasing the bolt-hole clearance within the investigated values.

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Bolted joints in quasi-unidirectional glass-fibre NCF composite laminates

Cited by 14 publications

References 24 publications

Kıvrımsız cam elyaf takviyeli kompozit plakalarda pim bağlantılarının deneysel olarak incelenmesi

Kıvrımsız cam elyaf takviyeli kompozit plakalarda pim bağlantılarının deneysel olarak incelenmesi

A non‐crimp fabric mechanical characterization for the production of aerospace components

Experimental and Finite Element Analysis of Bolt-Hole Clearance Effects in Composite Joints

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