Anticipating the induced delamination formation in composite laminates subjected to bending loads

Bahrami, Mohammad; Malakouti, M.; Farrokhabadi, Amin

doi:10.1111/ffe.13554

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…The first way is preferable if the solution is built "on average"-taking into account approximate methods, especially in nonlinear systems [70,71]. In applied theories, U is usually understood as the sum of the energies of membrane and bending deformations, which is asymptotically accurate [72].…”

Section: Criteria For Increasing Delaminationmentioning

confidence: 99%

“…Papers [33,72,84] provide reviews of early results of delamination crack growth in a multidirectional laminated plate from a straight edge. In the [±θ] structure packages, tensile failure Mode III (longitudinal displacement) predominates.…”

Section: Processes Of Delamination Growthmentioning

confidence: 99%

“…Delaminations that are anisotropic [25,38,39] have initial deflections due to residual stress, impact [15,61,72] or heating [17,30], and delaminations with incisions (which are "pocket-like") [65,66] bulge out without bifurcations under compression or shear pressure.…”

Section: Delamination Resistancementioning

confidence: 99%

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A Review of Delamination Damage of Composite Materials

Huang,

Bobyr

2023

J. Compos. Sci.

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The theoretical and practical achievements in the field of the theory of strength and reliability of composite materials are discussed in a review conducted on the scientific research conducted on the effect of delamination on the reliability and quality of composites. The methodological aspects of the stability of the mechanical characteristics of composite materials under the combined action of cyclic and impact loads are examined, as are the manufacturing and processing technologies. The reasons for delamination, such as technological, manufacturing and application, free edge, joints and loads, are revealed. The influence of delamination on the bearing capacity of structural elements made of composite materials is analyzed. The mechanism of delamination growth is outlined, and the criteria and processes are defined, such as the growth of delamination cracks in a multidirectional laminated plate from a straight edge, edge delamination during plate bending, delamination in plates in the field of residual stresses, etc. The importance of taking into account the visco-plastic effect at the top of the edge crack of delamination of composite materials is emphasized. The concept of critical delamination behavior is characterized, and the issues of delamination stability are described.

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Section: Criteria For Increasing Delaminationmentioning

confidence: 99%

Section: Processes Of Delamination Growthmentioning

confidence: 99%

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A Review of Delamination Damage of Composite Materials

Huang,

Bobyr

2023

J. Compos. Sci.

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“…In addition, the effect of thermal cycle fatigue on the curvature and residual stresses of nanocomposite laminates was investigated by Tabatabaeian and Ghasemi. [7] One of the major problems with composite materials is deboning between their constituents namely delamination which has led to much research devoted to the study of this phenomenon in composites [8][9][10][11][12][13][14] . Such a failure stems from the propagation of preexisting cracks or the formation of new cracks along with the material interfaces.…”

Section: Introductionmentioning

confidence: 99%

Critical strain energy release rate of woven carbon/epoxy composites subjected to thermal cyclic loading

2022

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In the current study, experimental and numerical approaches were adopted to investigate the effect of thermal cyclic load on the delaminated beam behavior of woven carbon/epoxy laminated composites. For this purpose, composite specimens were prepared according to ASTM standard and subjected to 175 thermal cycles in the range of −30 to 60°C before conducting the mode I and mode II interlaminar fracture tests. Experimental results revealed that thermal cycles lead to a drop in maximum loading capacity of the delaminated beam as well as the interlaminar fracture toughness of the woven carbon/epoxy composites. The beam fracture toughness at initiation and propagation decreased by 8% and 12% under mode I loading and by 13.84% and 15.64% under mode II loading, respectively. In the numerical analysis, the cohesive zone model was utilized in order to predict the global response of the delaminated beams. The micro and scanning electron microscope images of fracture surfaces provide efficient insights into the identification of the main mechanisms contributing to decreasing fracture toughness under cyclic thermal load. These images show that specimens subjected to cyclic thermal load exhibited smoother surfaces, which could be due to weaker bonding between matrix and fibers after cyclic thermal loading.

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Integration of carbon nanotube yarns into glass‐fiber reinforced composites for electrical self‐sensing of damage under cyclic bending and impact loading

Uribe‐Riestra,

Pech‐Pisté,

Avilés

2024

Polymer Composites

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Continuously long carbon nanotube yarns (CNTYs) were integrated into glass fiber weave/vinyl ester composites to act as electrical sensing elements to self‐monitoring damage. A grid comprising one longitudinal and three transverse CNTYs, running through the 125 mm long flexural specimen, was integrated into the top and bottom layers of glass fiber weaves to allow monitoring of the electrical resistance and locate damage. Four‐point bending specimens were tested under cyclic flexural loading, alternating with low‐velocity impacts to monitor damage initiation and progression. The electrical response of the CNTY grid is able to pinpoint the region where damage initiates, accumulates, and propagates under cycling loading, triggered or not by impact. The damage location identified by the electrical response of CNTYs is supported by in situ in‐plane and through‐thickness strain fields measured by digital image correlation (DIC). The correlation between the electrical technique and the DIC‐measured strain fields indicate that the majority of damage occurs through interlaminar stresses at or near the supports and/or loading introduction elements of the flexural test rig. Integrating CNTYs into structural composites enables online damage monitoring, leading to intelligent condition‐based maintenance for naval ships, aircrafts, and other structures, ultimately extending service life and reducing costs.Highlights CNTYs were integrated into composites for damage self‐sensing. Electrical response of CNTYs pinpoints the region of damage. Damage caused by cyclic bending and low velocity impacts were identified. Electrically identified damage is supported by DIC.

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Anticipating the induced delamination formation in composite laminates subjected to bending loads

Cited by 4 publications

References 32 publications

A Review of Delamination Damage of Composite Materials

A Review of Delamination Damage of Composite Materials

Critical strain energy release rate of woven carbon/epoxy composites subjected to thermal cyclic loading

Integration of carbon nanotube yarns into glass‐fiber reinforced composites for electrical self‐sensing of damage under cyclic bending and impact loading

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