Flexural strength and interlaminar shear strength of stitched GRP laminates following repeated impacts

Mouritz, A.P.; Gallagher, Jenny Sadler; Goodwin, Andy A

doi:10.1016/s0266-3538(96)00164-9

Cited by 138 publications

(81 citation statements)

References 26 publications

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“…Thus, the evolution of bending residual strength at various impact energies and variable impact numbers was studied. The reduction in residual strength of repeatedly impacted specimens was also noticed by Mouritz et al [6]. These authors determined the bending and shearing post-impact properties, of laminated composites containing glass fibres and ester of vinyl resin.…”

Section: Introductionsupporting

confidence: 56%

Some insights into the impact fatigue damage behaviour in laminated composites

Ouroua¹,

Azouaoui²,

Mesbah³

et al. 2006

WIT Transactions on the Built Environment, Vol 87

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An experimental method for impact fatigue of low energy was devised to provide some insights into the impact fatigue damage behaviour and characterize the response of laminated glass/polyester composites under conditions of increasing impact energy and increasing number of impacts. The impact frequency and subsequent projectile velocity of an impact fatigue apparatus specially designed and fabricated was varied to provide a spread of incident energies. The internal damage as a consequence of repeated impacts was investigated at five different levels of incident impact energy in the range of 3 -7J, with the laminated specimens. The results indicated that the laminates suffered severe microstructural damage under impact fatigue, including cracking of the resin, delaminations, crushing and fracture of the glass fibres. Macroscopic failure mode can also be observed, such as; formation of spherical crater and propagating crack at the back face of plates, formed by the tensileshearing failure of fibre bundles at the weaving level. The delamination behaviour in the laminated specimens depended largely upon the level of incident energy. Well-defined impact fatigue (E-N f ) behaviour, showing an endurance limit at above 10 4 impact cycles, has been demonstrated.

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Section: Introductionsupporting

confidence: 56%

Some insights into the impact fatigue damage behaviour in laminated composites

Ouroua¹,

Azouaoui²,

Mesbah³

et al. 2006

WIT Transactions on the Built Environment, Vol 87

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“…Contrarily, it was reported that the three-point flexural strength of two-directional stitched E-glass/vinylester composite structures was reduced by stitching and stitched induced stress concentration sites [21,22]. The stitching in the through-the-thickness direction increased impact damage performance.…”

Section: Methodsmentioning

confidence: 98%

Development Of Multistitched Three-Dimensional (3D) Nanocomposite And Evaluation Of Its Mechanical And Impact Properties

Bilişik

Özdemir

Kaya

2017

Autex Research Journal

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Multistitched three-dimensional (3D) woven E-glass/polyester/nanosilica composite (MNS) was developed. Its mechanical and impact performances were characterized for particular end-use applications. It was found that the warp-weft directional tensile strength and modulus of MNS structure were higher than those of the off-axis directions. In addition, there was not a big difference between warp and weft directional bending and short beam strengths of MNS structure. The MNS structure had a small damaged area under low velocity impact load. The failure was confined at a narrow area because of multistitching and nanomaterial and resulted in the catastrophic fiber breakages in the normal direction of the applied load of the structure. The results from the study indicated that the multistitching and the addition of nanosilica in the composite structure improved its damage tolerance.

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“…A user-defined subroutine called a VUMAT was used to write the constitutive behaviour for a non-linear elastic damaging material model. Modelling the transverse behaviour of thick woven composite plates is important [25], and the plates are thus discretised with solid elements thereby allowing the required 3d degradation of the woven ply material via a simple damage mechanics approach. Delamination between plies or groups of plies is also modeled using cohesive elements and a traction-separation law available in Abaqus/Explicit.…”

Section: Introductionmentioning

confidence: 99%