Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Ali, Hafiz T.; Akrami, Roya; Fotouhi, Sakineh; Pashmforoush, Farzad; Fragassa, Cristiano; Fotouhi, Mohammad

doi:10.22190/fume191119010a

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…The DIC measurements were able to follow the nonlinear slip distributions at a low slip magnitude as theoretically described in the literature 9,10,45 and obtained from the use of equation (3). After the debonding load has been reached, the slip distributions of the anchored CFRP-to-timber joints tended to a linear configuration that, as expected, is confirmed by the replacement of the displacements made and missed by the DIC technique.…”

Section: Slip Distributionssupporting

confidence: 70%

“…The use of CFRP composites also allows us to increase the strength and stiffness of all elements of the timber construction. In addition, their good thermal and acoustic insulation and their non-corrosion properties, 2,3 makes the use of FRP composites on timber constructions a very good alternative to other conventional materials such as metals. 2 The externally bonded or the near surface mounted (NSM) are just some examples of techniques that have been used to repair ancient timber buildings.…”

Section: Introductionmentioning

confidence: 99%

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Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Biscaia

Canejo

Zhang

et al. 2021

Structural Health Monitoring

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The use of optic measurements such as digital image correlation to take strain measurements of fibre-reinforced polymers bonded to a substrate has been on the increase recently. This technique has proven to be useful to fully characterize the bond behaviour between two materials. Although modern digital cameras can take high-definition photos, this task is far from simple due to the tiny displacements that need to be measured. Consequently, digital image correlation measurements lead to relative errors that, at an initial stage of the debonding process, are higher than those calculated close to the debonding of the fibre-reinforced polymer from the substrate. This study aims to evaluate and analyse the use of the digital image correlation technique on the bond between carbon fibre-reinforced polymer laminates and timber when subjected to a pull-out load consistent with fracture Mode II. To allow the quantification of the relative errors obtained from the digital image correlation measurements during the full debonding process, several strain gauges were used to measure the strains in the carbon fibre-reinforced polymer composite. The accuracy of the digital image correlation measurements is analysed by comparing it with those obtained from the strain gauges, which is a very well-established measuring technique. Another contribution of this study is to check the versatility of the digital image correlation measurements on a broader range of situations. To that end, several timber prisms were bonded with seven different bonding techniques with and without the installation of a mechanical anchorage at the carbon fibre-reinforced polymer unpulled end. The results showed that the digital image correlation technique was able to track the slips calculated from the strain gauge measurements until the debonding load, but after that, some difficulties to measure the displacements of the anchored carbon fibre-reinforced polymer-to-timber joints were detected. The digital image correlation technique also over predicted bond stresses when compared with those taken from the strain gauges, which led to bond–slip relationships with higher bond stresses.

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Section: Slip Distributionssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Biscaia

Canejo

Zhang

et al. 2021

Structural Health Monitoring

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“…Impact energy is absorbed, among other things, by the destruction mechanism [38]. In the case of laminated shells, the characteristic failure mechanism is matrix cracking, delamination, fibre/matrix debonding and a fibre breakage [39].…”

Section: Discussionmentioning

confidence: 99%

Impact of the Development of the Design of Firefighter Helmets on the Mechanical Shock Absorption Capacity

Walczak,

Pieniak,

Lonkwic

et al. 2023

Adv. Sci. Technol. Res. J.

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A firefighter's helmet is used as a basic personal protective equipment item. The purpose of the helmet is to absorb a part of mechanical impact acting towards the rescuer's cervical spine, which may lead to its injury. The aim of the study was to determine the effect of changes in the helmet design on the threshold passive forces transferred to the firefighter's cervical spine. The test subjects were firefighter's helmets compliant with the European standard for helmets used by fire brigades. The study was carried out under model conditions, using special equipment with a head model and an additional force sensor placed under it, where the cervical spine is anatomically located. The central impact energy was assumed to be 60 J. A semi-spherically ended beater was used. The experimentally determined force-displacement characteristics revealed two phases of force increase. Using polyurethane foam as a cushioning insert instead of the expanded polyester used in older designs reduced values of forces in the first phase of the characteristic. There were many cases where the critical passive force value was exceeded, which would have resulted in the cervical spine injury. Modifications in material selection and component manufacturing technology affect the protective capabilities of firefighter's helmets and result in their improvement. Nevertheless, helmets that are currently in use are still affected by forces whose values exceed the ones that are considered to be safe for a firefighter.

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“…The energy absorption capacity is highly critical for many engineering applications and some investigations on the traditional composite materials and foams have already been conducted [23][24][25]. This feature is also one of the most significant properties of AMSFs and strongly depends on plateau behavior.…”

Section: Figure 6 Compressive Properties Of Bubble Alumina Reinforcementioning

confidence: 99%

Mechanical and Physical Characteristics of Bubble Alumina Reinforced Aluminum Syntactic Foams Made Through Recyclable Pressure Infiltration Technique

Bolat

Bekar

Gökşenli

2022

Gazi University Journal of Science

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Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Cited by 9 publications

References 23 publications

Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Using digital image correlation to evaluate the bond between carbon fibre-reinforced polymers and timber

Impact of the Development of the Design of Firefighter Helmets on the Mechanical Shock Absorption Capacity

Mechanical and Physical Characteristics of Bubble Alumina Reinforced Aluminum Syntactic Foams Made Through Recyclable Pressure Infiltration Technique

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