A Numerical/Experimental Study on the Impact and CAI Behaviour of Glass Reinforced Compsite Plates

Perillo, Giovanni; Jørgensen, Jens Kjær; Cristiano, Roberta; Riccio, Aniello

doi:10.1007/s10443-017-9628-2

Cited by 11 publications

(9 citation statements)

References 43 publications

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“…In this study, the Puck criteria proposed by Puck and Schürmann [18] were employed for the matrix cracking prediction. Puck criteria have been widely used [23,24,25] since they can predict the crack initiation and its angle successfully. The fracture angle is important in LVI simulations.…”

Section: Finite Element Modeling Strategymentioning

confidence: 99%

Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

Tan

Sun

et al. 2019

Materials

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The effect of matrix cracking on the delamination morphology inside carbon fiber reinforced plastics (CFRP) laminates during low-velocity impact (LVI) is an open question. In this paper, the relationship between matrix cracking and delamination is studied by using cross-ply laminates. Several methods, including micrograph, C-scan, and visual inspection, were adopted to characterize the damage after LVI experiments. Based on the experimental results, finite element (FE) models were established to analyze the damage mechanisms. The matrix cracking was predicted by the extended finite element method (XFEM) and the Puck criteria, while the delamination was modeled by cohesive elements. It was revealed that the matrix crack in the bottom ply not only promoted the outward propagation of delamination but also contributed to the narrow delamination beneath the impact location. Multiple matrix cracks occurred in the middle ply. The ones close to the plate center initiated the delamination and prevented large-scale delamination beneath the impact location. For the cracks that were far away, no significant effect on delamination was found. In conclusion, the stress redistribution caused by the crack opening determines the delamination.

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Section: Finite Element Modeling Strategymentioning

confidence: 99%

Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

Tan

Sun

et al. 2019

Materials

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“…6). According to [23], a triaxial ply can be approximated to the equivalent properties of individual plies oriented in [+45/-45/0] with 35%, 35% and 30% contributions, respectively, whereas uniaxial plies can be approximated to the equivalent properties of individual plies oriented in [0/90] layers with 95% and 5% contributions, respectively. These multidirectional plies correspond to the smearing properties and cannot be explicitly utilised for progressive damage modelling, as they would be unable to predict the impact response of individual plies subjected to impact.…”

Section: Modelling Methodsmentioning

confidence: 99%

“…In the literature [22,23,24,25], most of the impact modelling techniques at the coupon scale are based on pure solid elements involving the discretisation of plies throughout the coupon length, with brick elements and their interfaces defined by cohesive formulations. However, this requires a adequate number of elements through-thethickness (at least one element for each ply) [26].…”

Section: Problem Statement and Literature Reviewmentioning

confidence: 99%

Comparison of numerical modelling techniques for impact investigation on a wind turbine blade

Verma

Vedvik

Haselbach

et al. 2019

Composite Structures

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Wind turbine blades are exposed to numerous impact risks throughout their lifetimes. The impact risks range from bird collisions during operation to impacts with surrounding structures at the time of transportation and installation. Impact loads on the fibre composite blades can induce several complex, simultaneously interacting and visually undetectable damage modes and have a high potential to reduce the local and global blade sti↵ness. An assessment of such impact-induced damages is therefore necessary and usually involves high computational costs using numerical procedures, especially when analysing large composite components. To minimise this computational expense, di↵erent numerical impact modelling techniques are utilised, primarily shell-element-based approaches and multiscale-modelling-based global-local approaches. In this article, a comparison between (1) pure shell, (2) shellto-solid coupling, and (3) submodelling finite element modelling techniques using Abaqus/Explicit is presented for a case where an impactor hits the leading edge of a blade. A high-fidelity local solid finite element model is developed for the leading edge of a DTU 10 MW blade at the region of impact and its sti↵ness is compared with baseline. A user material subroutine VUMAT for the intralaminar damage mode based on the Hashin failure criterion is formulated and then validated via an experiment from the literature. Finally, based on di↵erent numerical modelling techniques, impact investigations are performed, and the impact responses, damage to the blade and computational analysis durations are compared. It is found that the submodelling-based global-local approach is the most e cient analysis technique for this case, capturing failure modes including delamination, core crushing and local surface indentation in the blade. The findings of this study can be used to develop accurate and computationally e cient tools for modelling impact-induced damage to a blade.

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“…According to Ref. [32], the residual compression strength of GFRP laminates under the applied impact energies of 45 J and 68 J are about 75% and 60% of compressive strength of the undamaged GFRP laminates, respectively. There is a lack of the residual compression strength of GFRP laminates under the applied impact energy of 108J, so the reduction of CFRP properties after impact is used herein.…”

Section: Residual Ultimate Compressive Load Capacity Of Damaged Panelsmentioning

confidence: 99%

Low-velocity impact responses and CAI properties of synthetic foam sandwiches

Wang

GangaRao

et al. 2019

Composite Structures

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This paper presents experimental and analytical studies on impact and compression after impact (CAI) responses of synthetic foam sandwiches with glass fiber reinforced polymer (GFRP) skins and synthetic foam cores under low-velocity impacting. The impact test results showed that the penetration depth of GFRP panels with synthetic foam is much smaller than that of bare synthetic foam panels. The edgewise compression test results indicated the facesheet debonding dominates the failure mode of the sandwich panels without lattice webs, while the failure mode of the sandwich panels with lattice webs is predominated by the wrinkling and delamination of the facesheets and the crushing of foam core. The influences of applied impact energy, GFRP lay-up, synthetic foam density and the existence of webs on the impact and post impact behavior of sandwich panels are discussed herein. Analytical models are proposed to predict the residual ultimate edgewise compressive load capacity of sandwich panels with lattice webs after impacts, using energy principles and variational methods in applied mechanics. The influences from impact damage, the local buckling of the facesheets and the confined strength of the foam core are measured and compared well with proposed analytical models.

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A Numerical/Experimental Study on the Impact and CAI Behaviour of Glass Reinforced Compsite Plates

Cited by 11 publications

References 43 publications

Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

Relationship Between Matrix Cracking and Delamination in CFRP Cross-Ply Laminates Subjected to Low Velocity Impact

Comparison of numerical modelling techniques for impact investigation on a wind turbine blade

Low-velocity impact responses and CAI properties of synthetic foam sandwiches

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