Influence of z-pin length on the delamination fracture toughness and fatigue resistance of pinned composites

Pegorin, F.; Pingkarawat, K.; Daynes, Stephen; Mouritz, A.P.

doi:10.1016/j.compositesb.2015.03.093

Cited by 83 publications

(38 citation statements)

References 34 publications

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“…The delamination damage resistance in the FRPs can be exemplified by interlaminar fracture toughness in three different modes, namely Mode I—crack opening, Mode II—in‐plane shear, and Mode III—out‐of‐plane shear. Several remedies have been proposed and implemented to enhance the FRPs’ poor interlaminar fracture resistance, such as stitching , interleaving with toughened polymer , fiber surface treatment , and z‐pinning . However, some of these methods usually deteriorate the in‐plane mechanical performance of the FRPs .…”

Section: Introductionmentioning

confidence: 99%

Interlaminar fracture toughness of hybrid carbon fiber‐carbon nanotubes‐reinforced polymer composites

Boroujeni

Al-Haik

2018

Polymer Composites

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In this study, a relatively low temperature synthesis technique; graphitic structure by design (GSD), was employed to grow multi‐walled carbon nanotubes (MWCNTs) over carbon fiber fabrics. The MWCNTs forests were grown into two different morphologies, uniform and patterned. Hybrid carbon fiber‐reinforced polymer composites (CFRPs) were fabricated based on the hybrid reinforcement. Double cantilever beam tests were performed to investigate the effect of the surface grown nano‐reinforcements on the Mode I interlaminar fracture toughness (GIc) of the hybrid CFRPs. Results revealed that the surface grown MWCNTs enhanced the GIc of the CFRPs by 22 and 32%, via uniform and checkerboard‐patterned growth morphologies, respectively. Fractography was also employed to reveal the MWCNTs’ role in interlaminar crack stoppage and deflection resulting in improving GIc of the hybrid CFRPs. POLYM. COMPOS., 40:E1470–E1478, 2019. © 2018 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Interlaminar fracture toughness of hybrid carbon fiber‐carbon nanotubes‐reinforced polymer composites

Boroujeni

Al-Haik

2018

Polymer Composites

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“…The mode II fracture toughness, G IIC , was calculated using the maximum load sustained by the sample. The G IIC value was calculated [22,23] as given by Equation (4): (4) where Figure 2 shows fracture surfaces of the CFRP samples. The nano rubber appears to have bonded to the surface of the carbon fibre and debonded from the matrix.…”

Section: Figure 1 Manufacturing Techniques Used In This Studymentioning

confidence: 99%

Toughening of carbon fibre reinforced polymer composites with rubber nanoparticles for advanced industrial applications

Özdemir¹,

Zhang²,

Aspin³

et al. 2016

Express Polym. Lett.

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Abstract. This study investigates the effects of nano carboxylic acrylonitrile butadiene rubber (CNBR-NP) and nano acrylonitrile butadiene rubber (NBR-NP) on the interlaminar shear strength and fracture toughness of carbon fibre reinforced polymer composites (CFRP) with dicyandiamide-cured epoxy matrix. The results show that nano-size dispersion of rubber significantly improved the Mode I delamination fracture toughness (G IC ) of the CFRP by 250% and its Mode II delamination fracture toughness (G IIC ) by 80% with the addition of 20 phr of CNBR-NP. For the NBR-NP system, the G IC and G IIC delamination fracture toughness of the CFRP were increased by 200 and 80% respectively with the addition of 20 phr (parts per hundred rubber) of nano rubber to the matrix. Scanning electron microscopy (SEM) images of the fracture surface revealed that the toughening was mainly achieved by debonding of the nano rubber, crack path deflection and fibre bridging.

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“…Using equations (14)(15)(16), with the normalised variables from equation (17), the governing relationships for the normalised transverse displacement and axial force can be defined using a set of non-linear ordinary differential equations for each segment of the Z-pin: and by virtue of equation (10) and (17) Y is given by =…”

Section: Modified Bridging Traction Modelmentioning

confidence: 99%

“…However, the embedded length of the Z-pins in the laminate will vary, depending on the thickness of the component being reinforced. The apparent embedded length will also vary when multiple delamination are formed [15] or in situations when the Z-pins have different penetration depths [16]. Despite its important influence on the traction response, the Z-pin embedded length has been the subject of only a very limited number of studies.…”

Section: Introductionmentioning

confidence: 99%

“…al. [16] was concerned with the relationship between Z-pin embedded length and the mode I and mode II fracture toughness and fatigue resistance of standard UD FRP composite test coupons. These tests showed that an increase in embedded length provide a higher resistance to mode I delamination growth but lower resistance to mode II delamination.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Z-pin embedded length on the interlaminar traction response of multi-directional composite laminates

et al. 2017

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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 AbstractThe work in this paper investigated the performance of composites through-thickness reinforcing Zpins as a function of their embedded length in pre-preg laminates. Single Z-pins were inserted into multidirectional carbon fibre laminates with increasing thicknesses, corresponding to embedded lengths from 1mm to 10mm and tested through a range of mixed mode displacement ratios to investigate their interlaminar bridging traction response. Detailed analysis of the tests revealed a nonlinear tangential friction response and its strong dependence on the embedded length of the Z-pin.

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Influence of z-pin length on the delamination fracture toughness and fatigue resistance of pinned composites

Cited by 83 publications

References 34 publications

Interlaminar fracture toughness of hybrid carbon fiber‐carbon nanotubes‐reinforced polymer composites

Interlaminar fracture toughness of hybrid carbon fiber‐carbon nanotubes‐reinforced polymer composites

Toughening of carbon fibre reinforced polymer composites with rubber nanoparticles for advanced industrial applications

Influence of Z-pin embedded length on the interlaminar traction response of multi-directional composite laminates

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