Damage sequence in thin-ply composite laminates under out-of-plane loading

Wagih, A.; Maimí, P.; González, E.V.; Blanco, N.; Aja, J.R. Sainz de; Escalera, Federico Martín de la; Olsson, Robin; Álvarez, Esteban Cañibano

doi:10.1016/j.compositesa.2016.04.010

Cited by 92 publications

(51 citation statements)

References 39 publications

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“…5c since the transverse failure is strongly controlled by the inter-fiber distance [28]. [23,25,30]. We calculated E a for each specimen using load/unload data shown in Fig.…”

Section: Tensile Properties Of Pp and Gfppmentioning

confidence: 99%

Characterizing the influence of matrix ductility on damage phenomenology in continuous fiber-reinforced thermoplastic laminates undergoing quasi-static indentation

Yudhanto

Wafai

Lubineau

et al. 2018

Composite Structures

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The use of thermoplastic matrix was known to improve the impact properties of laminated composites. However, different ductility levels can exist in a single family of thermoplastic matrix, and this may consequently modify the damage phenomenology of thermoplastic composites. This paper focuses on the effect of matrix ductility on the out-of-plane properties of thermoplastic composites, which was studied through quasi-static indentation (QSI) test that may represent impact problem albeit the speed difference. We evaluated continuous glass-fiber reinforced polypropylene thermoplastic composites (GFPP), and selected homopolymer PP and copolymer PP that represent ductile and less ductile matrices, respectively. Several cross-ply laminates were selected to study the influence of ply thicknesses and relative orientation of interfaces on QSI properties of GFPP. It is expected that GFPP with ductile matrix improves energy absorption of GFPP. However, the damage mechanism is completely different between GFPP with ductile and GFPP with less ductile matrices. GFPP with ductile matrix exhibits smaller damage zone in comparison to the one with less ductile matrix. Higher matrix ductility inhibits the growth of ply cracking along the fiber, and this causes the limited size of delamination. The stacking sequence poses more influence on less ductile composites rather than the ductile one.

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“…5c since the transverse failure is strongly controlled by the inter-fiber distance [28]. [23,25,30]. We calculated E a for each specimen using load/unload data shown in Fig.…”

Section: Tensile Properties Of Pp and Gfppmentioning

confidence: 99%

Characterizing the influence of matrix ductility on damage phenomenology in continuous fiber-reinforced thermoplastic laminates undergoing quasi-static indentation

Yudhanto

Wafai

Lubineau

et al. 2018

Composite Structures

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“…For the same impact energy, the peak force of different impactor diameters exhibits slight difference under the mentioned impact conditions. However, from the analytical theory of out of plane indentation [34,35], the peak force will increase with a larger impactor diameter because the contact stiffness increases at the similar energy level. The difference between the analytical theory and the experimental result may cause by the different boundary conditions.…”

Section: Impact Force-time Historymentioning

confidence: 99%

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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“…[ and 8), i.e. (i) are the 45° cracks that propagate parallel to the fibre direction ('shear cracks' [33]), (ii) are the cracks initiated at fibre-free zones where the NCF yarn stitch two consecutive plies [34] and (iii) are the 90° cracks induced by tensile stresses at the bottom-plies of the laminate ('tensile cracks' [26]). Note that the latter observation was hindered by their narrow crack-opening.…”

Section: Non-destructive Inspectionmentioning

confidence: 99%

“…The impact response of thick laminates is dominated by shear and delamination [38]. Accordingly, the load-displacement curve presents two consecutive load-drops, attributed respectively to the onset of delamination and to fibre failure processes [26,27,33]. In contrast, the response of thin laminates is dominated by bending and associated non-linear membrane effects, which reduce or suppress the evidence of delamination onset in the force-displacement curve (i.e.…”

Section: Force-displacement Curvesmentioning

confidence: 99%

The effect interleaving has on thin-ply non-crimp fabric laminate impact response: X-ray tomography investigation

García-Rodríguez

Costa

Singery³

et al. 2018

Composites Part A: Applied Science and Manufacturing

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To improve the damage resistance and tolerance of thin laminates manufactured with thin-ply non-crimp-fabrics, we interleaved non-woven veils (two different types of co-polyamide veil were studied) into the interlaminar regions. We devised an impact, compression after impact (CAI) and quasi-static indentation experimental campaign, where X-ray micro-computed tomography illustrated how: (a) matrix cracking, delamination and fibre failure interact during out-of-plane loading and (b) interleaving affects the thickness of the interface. One type of thermoplastic interlayer avoided resin accumulation, reduced the initiation of delamination and improved CAI strength by up to 28%.

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Damage sequence in thin-ply composite laminates under out-of-plane loading

Cited by 92 publications

References 39 publications

Characterizing the influence of matrix ductility on damage phenomenology in continuous fiber-reinforced thermoplastic laminates undergoing quasi-static indentation

Characterizing the influence of matrix ductility on damage phenomenology in continuous fiber-reinforced thermoplastic laminates undergoing quasi-static indentation

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

The effect interleaving has on thin-ply non-crimp fabric laminate impact response: X-ray tomography investigation

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