Exploration of energy absorption and viscoelastic behavior of CFRPs subjected to low velocity impact

Xiao, Lin; Wang, Guanhui; Qin, Si; Han, Zhaoxiang; Li, Xiaodan; Zhang, Dongxing

doi:10.1016/j.compositesb.2018.11.126

Cited by 36 publications

(14 citation statements)

References 28 publications

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“…When an impact force acts upon a composite, energy is released, with part of it utilised in elastic deformation, while excess energy is dissipated through various mechanism that leads to the failure of the material [39][40][41][42]. Therefore, the degree of damage due to an impact force depends on the amount of energy absorbed by the laminate.…”

Section: Charpy Impact Responsementioning

confidence: 99%

The Influence of Ply Stacking Sequence on Mechanical Properties of Carbon/Epoxy Composite Laminates

et al. 2022

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In this work, the effect of ply stacking sequence of carbon/epoxy laminates subjected to flexural, tensile and impact loading was investigated. Five laminates with different stacking configurations were produced using the hand-laying-up technique. This includes a unidirectional laminate, cross-ply laminates, and quasi-isotropic laminates. Following the autoclave curing process, the responses of the composites to bending, tension and impact force were determined according to ASTM standards, and their corresponding strength, stiffness as well as impact energy were evaluated. Likewise, the flexural failure mode associated with each laminate was characterised using an optical microscope. The unidirectional laminates have higher flexural and tensile strength compared to the cross-ply and quasi-isotropic laminates. Moreover, as a result of material symmetry, the flexural and tensile modulus of symmetric cross-ply laminate improved by 59.5% and 3.97% compared to the unsymmetric counterpart. Furthermore, the quasi-isotropic laminates with absorption energy of 116.2 kJ/m2 and 115.12 kJ/m2, respectively have higher impact resistance compared to other samples.

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Section: Charpy Impact Responsementioning

confidence: 99%

The Influence of Ply Stacking Sequence on Mechanical Properties of Carbon/Epoxy Composite Laminates

et al. 2022

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“…The first one is based on assessing the residual properties of the damaged composites, after impact loading by using compression-after-impact (CAI) and other static tests [1][2][3][4]. The second one considers the composites energy absorption ability to evaluate the impact damage [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the successive impact behavior of composites in ship structures

et al. 2022

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Composite materials are categorized to be highly sensitive to low-velocity impact events. This feature is considered as a serious limitation for their application in engineering. Therefore, understanding impact energy absorption is critical in improving composite material damage tolerance and especially under successive impacts. This work was dedicated to an experimental investigation that aims to study and compare the energy absorption ability and damage behavior of PVC-foam sandwich and GFRP laminated composites under multiple impacts occurring at small energy levels. For this purpose, low-velocity impact repeated tests were carried out until total absorption of the impact initial energy was reached. A relative energy absorption index and a rebound index were proposed in order to assess energy absorption capacity. The results indicated that, directly after the first impact, the sandwich composite formed from two 4mm laminated skins absorbed 80% of the initial impact energy, in comparison to approximately 60% for 8mm laminated composite. This performance of sandwich composite is attributed to the damping ability of the core. Also, the impact velocity rebound rate of this composite was found to be higher than that of laminates. However, impact damage is greater in composite sandwiches than in laminates.

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“…Carbon fiber reinforced plastics (CFRPs) are widely used in aerospace, military, marine, and automotive industry due to their high specific strength and stiffness [ 1 ]. However, CFRPs are easily damaged by transverse loading because fibers in the composite structures are mainly focused on in-plane direction than in the direction normal to plane [ 2 , 3 ]. A CFRP especially suffers low-velocity impacts, such as dropping a tool on the laminate surface during maintenance, bird strikes, and fall of hailstones [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, CFRPs are easily damaged by transverse loading because fibers in the composite structures are mainly focused on in-plane direction than in the direction normal to plane [ 2 , 3 ]. A CFRP especially suffers low-velocity impacts, such as dropping a tool on the laminate surface during maintenance, bird strikes, and fall of hailstones [ 3 ]. The major failure mechanisms caused by a low-velocity impact are matrix cracking, delamination, and fiber failure [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Determination of Impact Damage in CFRP via PVDF Signal Analysis with Support Vector Machine

Won

Woo

et al. 2020

Materials

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Carbon fiber reinforced plastics (CFRPs) have high specific stiffness and strength, but they are vulnerable to transverse loading, especially low-velocity impact loadings. The impact damage may cause serious strength reduction in CFRP structure, but the damage in a CFRP is mainly internal and microscopic, that it is barely visible. Therefore, this study proposes a method of determining impact damage in CFRP via poly(vinylidene fluoride) (PVDF) sensor, which is convenient and has high mechanical and electrical performance. In total, 114 drop impact tests were performed to investigate on impact responses and PVDF signals due to impacts. The test results were analyzed to determine the damage of specimens and signal features, which are relevant to failure mechanisms were extracted from PVDF signals by means of discrete wavelet transform (DWT). Support vector machine (SVM) was used for optimal classification of damage state, and the model using radial basis function (RBF) kernel showed the best performance. The model was validated through a 4-fold cross-validation, and the accuracy was reported to be 92.30%. In conclusion, impact damage in CFRP structures can be effectively determined using the spectral analysis and the machine learning-based classification on PVDF signals.

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Exploration of energy absorption and viscoelastic behavior of CFRPs subjected to low velocity impact

Cited by 36 publications

References 28 publications

The Influence of Ply Stacking Sequence on Mechanical Properties of Carbon/Epoxy Composite Laminates

The Influence of Ply Stacking Sequence on Mechanical Properties of Carbon/Epoxy Composite Laminates

Comparative study on the successive impact behavior of composites in ship structures

Determination of Impact Damage in CFRP via PVDF Signal Analysis with Support Vector Machine

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