Prediction for initiation of debonding damage and tensile stress–strain relation of glass-bead-filled modified polyphenylene oxide

Tsui, Chi Pong; Tang, Chak Yin; Fan, Jian; Xie, Xiaoguang

doi:10.1016/j.ijmecsci.2004.10.001

Cited by 13 publications

(11 citation statements)

References 18 publications

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“…4-6 it can be observed that, when the applied load is increased, the debonding continues to the equator or close to the equator and then kink out into the matrix. This has also been observed by Vejen and Pyrz (2001) and Tsui et al (2004) and modelled by Ivens et al (1995), Vejen and Pyrz (2002). The entire localized deformation process occurs in a controlled way.…”

Section: Tensile Test Resultssupporting

confidence: 67%

“…From these figures it can be observed that the initial damage mechanism is interfacial debonding, which initiates at one of the poles or at both poles. This has also been shown by different experimental methods and modelling in several studies on polymer-matrix materials with glass beads (van Hartingsveldt and van Aartsen, 1989;Zhuk et al, 1993;Sjö gren and Berglund, 1997;Asp et al, 1997;Meddad and Fisa, 1997a,b;Miller and Berg, 2003;Tsui et al, 2004). The same observation has been made for polymer matrix with continuous fibres loaded in tension (i.e.…”

Section: Tensile Test Resultssupporting

confidence: 64%

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Length-scale effects on damage development in tensile loading of glass-sphere filled epoxy

Tjernlund¹,

Gamstedt²,

Gudmundson³

2006

International Journal of Solids and Structures

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Particle-reinforced polymers are widely used in load-carrying applications. The effect of particle size on damage development in the polymer is still relatively unexplored. In this study, the effect of glass-sphere size on the damage development in tensile loaded epoxy has been investigated. The diameter of the glass spheres ranged from approximately 0.5-50 lm. The first type of damage observed was debonding at the sphere poles, which subsequently grew along the interface between the glass spheres and epoxy matrix. These cracks were observed to kink out into the matrix in the radial direction perpendicular to the applied load. The debonding stresses increased with decreasing sphere diameter, whereas the length to diameter ratio of the resulting matrix cracks increased with increasing sphere diameter. These effects could not be explained by elastic stress analysis and linear-elastic fracture mechanics. Possible explanations are that a thin interphase shell may form in the epoxy close to the glass spheres, and that there is a length-scale effect in the yield process which depends on the strain gradients. Cohesive fracture processes can contribute to the influence of sphere size on matrix-crack length. Better knowledge on these underlying size-dependent mechanisms that control damage development in polymers and polymer composites is useful in development of stronger materials. From a methodology point of view, the glass-sphere composite test can be used as an alternative technique (although still in a qualitative way) to hardness vs. indentation depth to quantify length-scale effects in inelastic deformation of polymers.

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Section: Tensile Test Resultssupporting

confidence: 67%

Section: Tensile Test Resultssupporting

confidence: 64%

Length-scale effects on damage development in tensile loading of glass-sphere filled epoxy

Tjernlund¹,

Gamstedt²,

Gudmundson³

2006

International Journal of Solids and Structures

View full text Add to dashboard Cite

show abstract

“…As Cho et al [15] reported, both matrix cracking and particle/matrix debonding led to the nonlinear behavior of the stress–strain curves. Tsui et al [16] also found that microcracks of the matrix could be initiated when the propagation rate of interface debonding declined at a specific strain via in situ SEM experiment. The matrix cracking has been verified experimentally: however, its detailed failure mechanism based on the numerical simulation has barely been reported.…”

Section: Introductionmentioning

confidence: 99%

The Strengthening and Toughening of Biodegradable Poly (Lactic Acid) Using the SiO2-PBA Core–Shell Nanoparticle

Pang

Duan

et al. 2019

Materials

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The balance of strengthening and toughening of poly (lactic acid) (PLA) has been an intractable challenge of PLA nanocomposite development for many years. In this paper, core–shell nanoparticles consisting of a silica rigid core and poly (butyl acrylate) (PBA) flexible shell were incorporated to achieve the simultaneous enhancement of the strength and toughness of PLA. The effect of core–shell nanoparticles on the tensile, flexural and Charpy impact properties of PLA nanocomposite were experimentally investigated. Scanning electron microscopy (SEM) and small-angle X-ray scattering (SAXS) measurements were performed to investigate the toughening mechanisms of nanocomposites. The experimental results showed that the addition of core–shell nanoparticles can improve the stiffness and strength of PLA. Meanwhile, its elongation at break, tensile toughness and impact resistance were enhanced simultaneously. These observations can be attributed to the cavitation of the flexible shell in core–shell nanoparticles and the resultant shear yielding of the matrix. In addition, a three-dimensional finite element model was also proposed to illustrate the damage processes of core–shell nanoparticle-reinforced polymer composites. It was found that, compared with the experimental performance, the proposed micromechanical model is favorable to illustrate the mechanical behavior of nanocomposites.

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“…However, studies on elastic-plastic response of open-cell HA-polymer macroporous biocomposite structure have not yet been reported. In this study, the effects of filler content on the mechanical properties of HA-PEEK macroporous biocomposite structure have been investigated by using a finite element unit-cell modeling technique [16,17]. The compressive stress-strain relation and stress concentration factor of the structures were determined.…”

Section: Introductionmentioning

confidence: 99%

Effects of Filler Content on Mechanical Properties of Macroporous Composites

Tsui

Tang

Guo

et al. 2010

Composite Interfaces

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The mechanical properties of hydroxyapatite related macroporous biocomposites (MPBs) are influenced by a number of factors, such as the pore size, the filler content and the properties of the matrix and the inclusion. Failure often occurs when the strength of the implant cannot bear the applied mechanical load. In this study, the effects of filler content on the mechanical properties of MPBs have been investigated. A finite element (FE) unit cell model of a macroporous hydroxyapatite-polyetheretherketone (HA-PEEK) biocomposite structure with uniform and interconnected pores has been constructed. In the FE model, the HA particles were assumed to have random distribution, and particle volume fraction would be varied in the PEEK matrix. The material behaviours of both HA and PEEK have been implemented in the ABAQUS finite element code. HA was modelled to exhibit elastic behaviour and undergo plastic softening to a residual strength when a critical stress was reached, while the PEEK matrix would follow elastic-plastic behaviour. The macroscopic compressive stress-strain relations of the macroporous biocomposite structures have been predicted. Increasing particle volume fraction could lead to an increase in the compressive elastic modulus of the structures but a reduction in the compressive strength. The von Mises stress distribution and the effect of stress concentration in the structures with different filler content are also discussed. The proposed model could provide macro-structural and microscopic information of the macroporous biocomposite structure to the designers in order to facilitate the fabrication of this kind of structure with optimum mechanical properties.

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Prediction for initiation of debonding damage and tensile stress–strain relation of glass-bead-filled modified polyphenylene oxide

Cited by 13 publications

References 18 publications

Length-scale effects on damage development in tensile loading of glass-sphere filled epoxy

Length-scale effects on damage development in tensile loading of glass-sphere filled epoxy

The Strengthening and Toughening of Biodegradable Poly (Lactic Acid) Using the SiO2-PBA Core–Shell Nanoparticle

Effects of Filler Content on Mechanical Properties of Macroporous Composites

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