The influence of different circular hole perforations on interlaminar shear strength of a novel fiber metal laminates

2014 ◽  
Vol 37 (3) ◽  
pp. 963-973 ◽  
Author(s):  
Mustafa Özgür Bora ◽  
Onur Çoban ◽  
Tamer Sinmazçelik ◽  
İsmail Cürgül
Keyword(s):  
Shear Strength ◽  
Circular Hole ◽  
Interlaminar Shear Strength ◽  
Fiber Metal Laminates ◽  
Interlaminar Shear ◽  
Fiber Metal

Experimental failure analysis and mechanical performance evaluation of fiber-metal sandwich laminates interleaved with polyamide-6,6 interlayers through the combined usage of acoustic emission, thermography and microscopy techniques

2020 ◽  
pp. 109963622092465
Author(s):  
Bertan Beylergil ◽  
Isa E Tabrizi ◽  
Jamal SM Zanjani ◽  
Shaghayegh Saeidiharzand ◽  
Leila H Poudeh ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Low Velocity Impact ◽  
Polyamide 66 ◽  
Low Velocity ◽  
Fiber Metal Laminates ◽  
Interlaminar Shear ◽  
Fiber Metal ◽  
Microscopy Techniques

Fiber-metal laminates are hybrid sandwich composite structures made of thin metallic sheets and layers of fiber-reinforced plastics. In this study, for the first time, the effects of polyamide 66 nonwoven interlayers on the tensile, three-point bending, interlaminar shear strength, and low velocity impact responses of fiber-metal laminates are investigated by coupling acoustic emission, thermography, and microscopy techniques. The fiber-metal laminates are interleaved with polyamide 66 nonwoven fabrics at two different areal weight density, namely, 17 gsm (grams per square meter) and 50 gsm. The tensile, bending, interlaminar shear strength, and low velocity impact tests are carried out in accordance with the ASTM standards. During the tensile and flexural tests, acoustic emission data are collected to understand damage types occurring under various loading conditions and, in turn, clearly shed light on the performance of polyamide 66 for interfacial strengthening in fiber-metal laminates. The results of acoustic emission investigation are correlated with the optical and scanning electron microscope-based microscopic analysis. It is shown that the interlaminar shear strength of fiber-metal laminates can be increased significantly (about 42%) by using polyamide 66 nonwoven interlayers. The impacted fiber-metal laminate specimens are examined to determine damage area and length using the lock-in thermography method. It is found that the polyamide 66 interlayers decrease the debonded length and damaged area up to 39 and 32%, respectively. The tensile and flexural strength and modulus of the fiber-metal laminate are not significantly affected by the presence of polyamide 66 interlayers, except a negligible drop in the value of tensile and flexural strength by 6 and 4%, respectively. The polyamide 66 interlayers are proved to be very successful in enhancing plastic deformation ability of the matrix and bonding efficiency between aluminum and composite sections.

scholarly journals Interlaminar Shear Strength (ILSS) Characterization of Fiber Metal Laminates (FMLs) manufactured through VARTM Process

2021 ◽  
pp. 100038
Author(s):  
Muhammad Yasir Khalid ◽  
Zia Ullah Arif ◽  
Ans Al Rashid ◽  
Muhammad Ihsan Shahid ◽  
Waqas Ahmed ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Fiber Metal Laminates ◽  
Interlaminar Shear ◽  
Fiber Metal ◽  
Vartm Process

scholarly journals Interlaminar Shear Strength and Failure Analysis of Aluminium-Carbon Laminates with a Glass Fiber Interlayer after Moisture Absorption

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2999
Author(s):  
Jarosław Bieniaś ◽  
Patryk Jakubczak ◽  
Magda Droździel ◽  
Barbara Surowska
Keyword(s):  
Shear Strength ◽  
Failure Analysis ◽  
Interlaminar Shear Strength ◽  
Metal Composite ◽  
Glass Composite ◽  
Fiber Metal Laminates ◽  
Composite Interface ◽  
Interlaminar Shear ◽  
Fiber Metal ◽  
Hygrothermal Conditioning

This article presents selected aspects of an interlaminar shear strength and failure analysis of hybrid fiber metal laminates (FMLs) consisting of alternating layers of a 2024-T3 aluminium alloy and carbon fiber reinforced polymer. Particular attention is paid to the properties of the hybrid FMLs with an additional interlayer of glass composite at the metal-composite interface. The influence of hygrothermal conditioning, the interlaminar shear strength (short beam shear test), and the failure mode were investigated and discussed. It was found that fiber metal laminates can be classified as a material with significantly less adsorption than in the case of conventional composites. Introducing an additional layer of glass composite at the metal-composite interface and hygrothermal conditioning influence the decrease in the interlaminar shear strength. The major forms of damage to the laminates are delaminations in the layer of the carbon composite, at the metal-composite interface, and delaminations between the layers of glass and carbon composites.

Mechanical properties of multiwall carbon nanotubes/unidirectional carbon fiber-reinforced epoxy hybrid nanocomposites in transverse and longitudinal fiber directions

2021 ◽  
pp. 096739112098651
Author(s):  
Saeedeh Saadatyar ◽  
Mohammad Hosain Beheshty ◽  
Razi Sahraeian
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Interlaminar Shear Strength ◽  
Lap Shear Strength ◽  
Transverse Tensile ◽  
Lap Shear ◽  
Longitudinal Fiber ◽  
Interlaminar Shear ◽  
Multiwall Carbon

Unidirectional carbon fiber-reinforced epoxy (UCFRE) is suffering from weak transverse mechanical properties and through-thickness properties. The effect of different amount (0.1, 0.3 and 0.5 phr which is proportional to 0.09, 0.27 and 0.46 wt%, respectively) of multiwall carbon nanotube (MWCNT), on transverse tensile properties, flexural strength, fracture toughness in transverse and longitudinal fiber directions, interlaminar shear strength and lap shear strength of UCFRE has been investigated. Dicyandiamide was used as a thermal curing agent of epoxy resin. MWCNT was dispersed in the epoxy resin by ultrasonic instrument and their dispersion state was investigated by scanning electron microscopy (SEM). The curing behavior of epoxy resin and its nanocomposites was assessed by differential scanning calorimetry. Results show that transverse tensile strength, modulus and strain-at-break were increased by 28.5%, 25% and 14%, respectively by adding 0.1 phr of MWCNT. Longitudinal flexural properties of UCFRE was not changed by adding different amount of MWCNT. Although longitudinal flexural strength was increased by 5% by adding 0.1 phr of MWCNT. Fracture toughness in transverse and longitudinal fiber directions was increased by 39% and 9%, respectively at 0.3 phr of MWCNT. Results also show that interlaminar shear strength and lap shear strength were increased at 0.3 phr of MWCNT by 8% and 5%, respectively. These increases in mechanical properties were due to the good adhesion of fibers to the matrix, interlocking and toughening action of MWCNT as revealed by SEM.

Effect of consolidation force on interlaminar shear strength of CF/PEEK laminates manufactured by laser-assisted forming

2021 ◽  
Vol 266 ◽  
pp. 113779
Author(s):  
Qiuyu Miao ◽  
Zhihong Dai ◽  
Guangyi Ma ◽  
Fangyong Niu ◽  
Dongjiang Wu
Keyword(s):  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Interlaminar Shear

Surface and Composite Interface of Carbon Fiber Modified by Grafting of Diethanolamine

2009 ◽  
Vol 79-82 ◽  
pp. 497-500 ◽  
Author(s):  
Lei Chen ◽  
Zhi Wei Xu ◽  
Jia Lu Li ◽  
Xiao Qing Wu ◽  
Li Chen
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Functional Groups ◽  
Carbon Fibers ◽  
Irradiation Dose ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Composite Interface ◽  
Γ Ray ◽  
Interlaminar Shear

The γ-ray co-irradiation method was employed to study the effect of diethanolamine modification on the surface of carbon fiber (CF) and the interfacial properties of CF/epoxy composites. Compared with the original carbon fiber, the surface of modified fibers became rougher. The amount of oxygen-containing functional groups was increased and the nitrogen element was detected after irradiation grafting. The interlaminar shear strength (ILSS) of composites reinforced by carbon fibers irradiated in diethanolamine solution was increased and then decreased as the irradiation dose increased. The ILSS of CF/epoxy composites was enhanced by 16.1% at 200kGy dose, compared with that of untreated one. The γ-ray irradiation grafting is expected to be a promising method for the industrialized modification of carbon fibers.

Ramie fiber reinforced composites with flame retardant structure design: flammability, smoke suppression, and mechanical properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chenkai Zhu ◽  
Lei Nie ◽  
Xiaofei Yan ◽  
Jiawei Li ◽  
Dongming Qi
Keyword(s):  
Shear Strength ◽  
Iron Oxide ◽  
Heat Release ◽  
Flame Retardant ◽  
Interlaminar Shear Strength ◽  
Smoke Suppression ◽  
Strength Analysis ◽  
Ramie Fiber ◽  
Composite Surface ◽  
Interlaminar Shear

Abstract In this work, the structure of composite was designed as Core Stack and Surface Stack, which was treated with the expandable graphite (EG) and metal oxides such as iron oxide (IO), hydroxyapatite (HA), and aluminum tri-hydroxide (ATH). The mechanical performance of composites was characterized via flexural performance and interlaminar shear strength analysis. The flame retardance and smoke suppression of composite was explored in detail by LOI, UL-94, and cone calorimeter test. The findings presented that flexural properties of composites were observed to decrease due to delamination of surface stack, whilst no significant effect on interlaminar shear strength. In comparison with control composite, the loading of metal oxide into composite Surface Stack led to the reduction of peak heat release rate, total heat release, and fire growth index effectively. Moreover, the remarkable decrease in total smoke production could be observed due to the addition of iron oxide and the flame retardant mechanism was discussed. This study was the preliminary exploration of composite with flame retardant design which could be potential solution to improve flame retardancy and smoke suppression of composite with better mechanical structure preservation.

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