Study of damage and crack in particulate composites

Kwon, Young W.; Lee, J.H.; Liu, C.T.

doi:10.1016/s1359-8368(98)80002-4

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…Application of strain in the last region of the curve is only to stretch the PMMA and enlarge existing cavities, which is believed to consequently cause the volume growth during loading. Such phenomenon has been studied by many researchers such as Ravichandran and Liu (1995), Kwon et al (1997Kwon et al ( , 1998. These studies investigated the nonlinear constitutive response of a damaged particulate composite in terms of the change in volume dilation and showed that the stress-strain response is nearly linear when there is little or no volume dilatation and the non-linearity sets in once the dilatation becomes significant.…”

Section: Failure Mechanismmentioning

confidence: 99%

Failure Mechanisms in PMMA/ATH Acrylic Casting Dispersion

Nie¹,

Basaran

Hutchins³

et al. 2006

Journal of the Mechanical Behavior of Materials

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Acrylic casting dispersion is used to fabricate particulate composites such as poly-methyl methacrylate (PMMA) filled with a fine dispersion alumina trihydrate (ATH). This composite is subjected to severe temperature variations during in-service conditions, giving rise to high thermal stresses which lead to failure by cracking. The influence of the interfacial bond strength between a particle and the matrix on the failure mechanism of acrylic casting dispersion has been investigated using in situ observations during tensile and compressive loadings. Experiments show that the failure in pure tension occurs differently than in flexure loading where the failure process is believed to be more complex. During tensile loading, it is observed that macroscopic fracture is initiated in the clusters of the reinforcing particles because of the strong interfacial bonding strength between the filler particles and matrix. For weak interfacial bond strength, the macroscopic fracture is initiated by separation of filler agglomerates from the matrix.

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Section: Failure Mechanismmentioning

confidence: 99%

Failure Mechanisms in PMMA/ATH Acrylic Casting Dispersion

Nie¹,

Basaran

Hutchins³

et al. 2006

Journal of the Mechanical Behavior of Materials

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show abstract

“…These include the application of linear fracture mechanics, mechanics of materials analysis and detailed finite element analysis, which attempt to include micromechanical details and simulate individual damage modes [19][20][21][22][23]. The point-stress and average-stress criteria models described in [24,25] require the evaluation of ''characteristics distance''.…”

Section: Introductionmentioning

confidence: 99%

Innovative tailored fiber placement technique for enhanced damage resistance in notched composite laminate

Koricho¹,

Khomenko²,

Fristedt³

et al. 2015

Composite Structures

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“…Creating notches/holes in CFRP laminates with machining/drilling has been extensively studied in the literature and as reported in the introduction, it significantly reduces the tensile modulus and strength of the laminates due to the damage induced during the machining process [4][5][6][7][8][9]. Thus, it would have made a reasonable sense if the machined-hole specimens had the least tensile modulus and strength compared to the tailored-hole specimens.…”

Section: Fibre Volume Fractionmentioning

confidence: 99%

“…The connections however, require introduction of holes and notches, which are generally drilled into the composites. Such machined-holes can introduce micro to macro scale defects leading to delamination and de-bonding between the reinforcement and matrix, which can significantly reduce the mechanical performance of the composite [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Tailored fibre placement of commingled carbon-thermoplastic fibres for notch-insensitive composites

El‐Dessouky

Saleh

Gautam

et al. 2019

Composite Structures

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Tailored fibre placement (TFP) is an embroidery-based technology that allows the fibre tows to be placed exactly where they are most needed for structural performance and stitched into position on a compatible textile or polymer substrate. In this study commingled carbon-nylon fibre tows were utilised to produce thermoplastic cross-ply net-shaped preforms using TFP. Four TFP composite plaques were manufactured; baseline (blank), machined-hole, tailored-hole-1 and tailored-hole-2. Steering the tows was used to create the hole in tailoredhole-1 and tailored-hole-2. In comparison to the design of tailored-hole-1, a different fibre trajectory, with a circular reinforcement around the hole, was suggested for the tailored-hole-2. Fibre volume fraction, optical microscopy, X-ray-CT scans, tensile and open-hole tests were carried out. With the exception of the baseline sample, the modified design of tailored-hole-2 composite exhibited the highest axial strength and modulus compared to the machined-hole and tailored-hole-1 composites. Only the tailored-hole-2 specimens exhibited less than 10% reduction of the notched strength compared to the un-notched strength. This study highlights the importance of the stress/load-paths and associated fibre-orientations. While TFP can be an extremely valuable design tool for composite preforms and resulting structural components, a deep understanding of stress distributions is inevitable to achieve optimal TFP-design.

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Study of damage and crack in particulate composites

Cited by 13 publications

References 6 publications

Failure Mechanisms in PMMA/ATH Acrylic Casting Dispersion

Failure Mechanisms in PMMA/ATH Acrylic Casting Dispersion

Innovative tailored fiber placement technique for enhanced damage resistance in notched composite laminate

Tailored fibre placement of commingled carbon-thermoplastic fibres for notch-insensitive composites

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