Mode II delamination resistance of composites reinforced with inclined Z-pins

M’membe, Beene; Gannon, Sam; Yasaee, Mehdi; Hallett, Stephen R.; Partridge, Ivana K.

doi:10.1016/j.matdes.2016.01.051

Cited by 58 publications

(45 citation statements)

References 13 publications

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“…The Z-pins are very effective in increasing the delamination toughness in quasi-static tests [5][6][7][8], and they have shown superior performance in mode I delamination compared with mode II case [9][10][11]. In mode I delamination, the Z-pins are normally pulled out, and considerable energy is dissipated during the frictional pull-out process [5,12].…”

Section: Introductionmentioning

confidence: 99%

“…In mode I delamination, the Z-pins are normally pulled out, and considerable energy is dissipated during the frictional pull-out process [5,12]. In contrast, the Z-pins tend to split and rupture when loaded in shear, offering only relatively low energy dissipation [6,9,10,13]. The bridging responses of Z-pins, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The failure mechanisms of a Z-pin also heavily depend on the topology of its surroundings. The layup of composite laminates [10], the insertion angle of Z-pins [9] and also the insertion length [12] have significant influence on the failure modes and energy dissipation of Z-pins. The Z-pins are surrounded by resin pocket in laminates [3], and the resin may get deformed and damaged due to lateral deformation of the pins [16].…”

Section: Introductionmentioning

confidence: 99%

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Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Cui

Yasaee

Kalwak

et al. 2017

Composites Part A: Applied Science and Manufacturing

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Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasiisotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Cui

Yasaee

Kalwak

et al. 2017

Composites Part A: Applied Science and Manufacturing

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“…On the other hand, metal Z-pin can experience a substantial amount of shear deformation, thus providing an effective toughening action. Generally speaking, the Z-pin response varies from complete pull-out to fracture as the mode-mixity ranges from pure Mode I to pure mode II [13]; hence, in principle, the bridging performance can be tailored by varying the Z-pin insertion angle [14], albeit some amount of "misalignment" is always present due to manufacturing variability.…”

Section: State Of the Artmentioning

confidence: 99%

An experimental investigation into multi-functional Z-pinned composite laminates

Zhang

Hallett²

2016

Materials & Design

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms demonstrate that the entire Mode I bridging response of Z-pins can be monitored, from the arrival of the delamination front to the complete pull-out of the through-thickness reinforcement. Hence the extent of delamination can be inferred from the throughthickness resistance. This is proved for both conductive (carbon fibre-reinforced) and non-conductive (glass fibre-reinforced) laminates. The premature Z-pin failure during progressive pull-out corresponds to an abrupt increase of through-thickness electrical resistance. The delamination sensing/suppression method presented in this paper can be readily applied to Z-pinned composites at structural level.

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“…M'membe et al [17] discussed the mode II resistance of laminated composite reinforced through the thickness with inclined Z-pins. Pegorin et al [18] compared the mode I and mode II delamination fatigue properties in Z-pinned aircraft composites.…”

Section: Introductionmentioning

confidence: 99%

A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

Tao

Yan

et al. 2016

Materials & Design

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Mode II delamination resistance of composites reinforced with inclined Z-pins

Cited by 58 publications

References 13 publications

Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

An experimental investigation into multi-functional Z-pinned composite laminates

A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

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