Low-velocity impact behavior and residual tensile strength of CFRP laminates

Zhou, Jianwu; Liao, Binbin; Shi, Yaoyao; Zuo, Yangjie; Tuo, Hongliang; Jia, Liyong

doi:10.1016/j.compositesb.2018.10.090

Cited by 80 publications

(26 citation statements)

References 42 publications

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“…The above-mentioned researches on the impactor diameter mostly focus on the impact response and compressive strength after impact, and there is a lack of detailed research on the effect of the shape and expansion of internal damage, which will have an important impact on the residual strength of composite structures. Several studies also explored the effect of impact mass and velocity on the low velocity impact of CFRPs [25][26][27], drawing similar conclusions that the mentioned impactor parameters significantly affect the impact results.…”

Section: Introductionmentioning

confidence: 86%

“…The transferred energy is partially absorbed by the composite laminate, thereby causing the internal damage. The other part of the energy is stored as elastic energy; thus, rebounding phenomena are generated [25]. The final energy value denotes the overall amount of energy dissipated by specimens largely by damage evolution.…”

Section: Absorbed Energymentioning

confidence: 99%

“…This is mainly because there are two main energy dissipation ways in the impact process, i.e., the intralaminar damage evolution (including matrix cracking, fiber breakage and fiber-matrix debonding) and interlaminar damage evolution (delamination). The permanent indentation mainly reflects the intralaminar damage state, and delamination area mainly reflects the interlaminar damage state [25]. Impactor diameter has different impact on contact stiffness, shear stiffness and bending stiffness under different energies, which will induce different intralaminar and interlaminar damage state.…”

Section: Ultrasonic C-scansmentioning

confidence: 99%

“…Icten et al [24] investigated the effect of impactor diameter on the impact response of woven glass-epoxy laminates; they investigated variation of the impact characteristics and CAI after impact test, and concluded that the impactor diameter highly affects the impact and CAI response of composites materials. Zhou et al [25] studied the effect of four factors including impactor diameter on the impact responses of CFRP laminates, and their experimental results demonstrate that the four factors have significant effects on the impact behaviors of laminates in different ways; however, the effect of impactor diameter at different impact energies was not involved. The above-mentioned researches on the impactor diameter mostly focus on the impact response and compressive strength after impact, and there is a lack of detailed research on the effect of the shape and expansion of internal damage, which will have an important impact on the residual strength of composite structures.…”

Section: Introductionmentioning

confidence: 99%

“…Quasi-static indentation [28] and drop-weight impact [29] are two commonly used method to inflict damage into a specimen. Both of them are widely used to measure damage resistance properties or residual strength properties in recent years [19,25,[30][31][32]. In the present study, drop-weight impact tests were performed to induce BVIDs into the composite specimens, and phased array ultrasonic testing was adopted to inspect the specimens subjected to low velocity impact.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Impactor Diameter Effect on Low-Velocity Impact Response of CFRP Laminates in a Drop-Weight Impact Event

Cao

Jiang

et al. 2020

Materials

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The present study delved into the effect of impactor diameter on low velocity impact response and damage characteristics of CFRP. Moreover, the phased array ultrasonic technique (PAUT) was adopted to identify the impact damages based on double-sided scanning. Low-velocity impact tests were carried out using three hemispherical impactors with different diameters. The relationship of impact response and impactor diameters was analyzed by ultrasonic C-scans and S-scans, combined with impact response parameters. Subsequently, the damage characteristics were assessed in terms of dent depth, delamination area and extension shape via the thickness, and the relationships between absorbed energy, impactor displacement, dent depth and delamination area were elucidated. As revealed from experiment results, double-sided PAUT is capable of representing the internal damage characteristics more accurately. Moreover, the impactor diameter slightly affects the impact response under small impact energy, whereas it significantly affects the impact response under large impact energy.

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Section: Introductionmentioning

confidence: 86%

Section: Absorbed Energymentioning

confidence: 99%

Section: Ultrasonic C-scansmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Investigation of Impactor Diameter Effect on Low-Velocity Impact Response of CFRP Laminates in a Drop-Weight Impact Event

Cao

Jiang

et al. 2020

Materials

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Impact response of repaired sandwich structures

et al. 2020

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The low-velocity impact behaviour of repaired sandwich structures with woven carbon/epoxy facesheets and Nomex honeycomb core is studied experimentally. First, sandwich plates were subjected to ballistic impacts; the damaged area was removed, filled by nano-enhanced resin and covered by a double-external patch. Afterwards, the repaired sandwich plates were impacted at low-velocity. Peak load and absorbed energy were determined for several impact energies and compared with results for non-repaired (intact) sandwich plates. For all impact energies tested, repaired specimens show higher peak load and lower absorbed energy than the intact ones. Additionally, tested sandwich plates were cut transversally in order to observe the resulting damage, concluding that is different in both configurations, and confirming that it is initiated at higher impact energies in repaired structures.

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Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

Wang

et al. 2020

Polymer Composites

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The purpose of this article is to investigate the mechanical responses and critical failure mechanisms of notched composite laminates with the aid of numerical and experimental approaches, considering the effect of notch geometry, notch size and off-axis angle. Quasi-static tensile tests are implemented to study the influence of design variables on the mechanical response, during which the relationship of force vs displacement and strain distributions are collected by means of digital image correlation technique. Subsequently, the numerical simulation is implemented in ABAQUS/Explicit through a progressive damage model integrated with a VUMAT subroutine. Meanwhile, the initiation and propagation of damage are explored through the damage morphologies, combining with the logarithmic strain components from numerical predictions. Results show that notch strength and failure strain are more closely associated with off-axis angle and notch size compared with notch geometry. In addition, with the increase of off-axis angle, the contribution of fiber is increasingly weakened, the damage mode gradually varies from fiber fracture to pull out accompanied with the damage near the notch changing from fiber fracture to delamination. Meanwhile, the critical failure mechanism varies from tension dominated to tension-shear/ shear dominated as the off-axis angle grows larger. K E Y W O R D S composite laminates, digital image correlation, failure mechanism, notch strength 1 | INTRODUCTION Carbon fiber reinforced polymer (CFRP) laminate has been increasingly applied in light of its outstanding performance and superior damage tolerance. Compared with traditional materials, it has many typical advantages, such as high specific strength and stiffness, [1-3] improved impact and fatigue resistance, [4-6] perfect corrosion resistance and moistureproof ability, [7] and so forth. During the application, in addition to the complicated loading conditions, the unavoidable notches for mechanical connections also pose a risk to the load-bearing capacity and service life. In addition, notch geometry and notch size are usually diversified to facilitate the connection of structural components, which significantly diminishes the mechanical properties and further complicates the exploration of mechanical behaviors. Furthermore, due to the anisotropy, brittleness, heterogeneity, and obvious difference between the interlaminar and intralaminar property, damage patterns, and failure mechanisms of composites also present complexity and diversity. [8]

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Low-velocity impact behavior and residual tensile strength of CFRP laminates

Cited by 80 publications

References 42 publications

Experimental Investigation of Impactor Diameter Effect on Low-Velocity Impact Response of CFRP Laminates in a Drop-Weight Impact Event

Experimental Investigation of Impactor Diameter Effect on Low-Velocity Impact Response of CFRP Laminates in a Drop-Weight Impact Event

Impact response of repaired sandwich structures

Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

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