Structure and Fracture Mechanics of Injection‐Molded Composites

Karger‐Kocsis, J.

doi:10.1002/9781118097298.weoc240

Cited by 5 publications

(5 citation statements)

References 31 publications

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“…Figure 6c shows the CT fracture surface of 10CF. When plane strain conditions prevail, the typical crack path in short fiber reinforced composites is of zig-zag type, as was intensively analyzed by KargerKocsis and Friedrich [13][14][15][16]. Three major failure mechanisms dominate the fracture behavior of conventional composites filled with short fibers:…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…Microsized short fibers (diameter and length in micron scale), e.g. short carbon fibers [11,12] (SCFs) and short glass fibers [13][14][15][16] were also employed to enhance the toughness of polymers. Inorganic particles and short fibers are especially attractive in EP matrices because they can improve the fracture toughness and the modulus (stiffness) at the same time.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with rigid particles, the toughening mechanisms achieved by short fibers, especially for randomly distributed fibers with a high aspect-ratio, are more complicated. Due to the relatively high aspect-ratio of short fibers, pull-out and fracture of fibers are important contributions to the toughness response [13][14][15][16]. Even though microsized fillers can effectively stiffen and toughen the EP matrix, when it is under stress, stress concentration can occur locally near the fillers and induce critical failure of the composite system [21].…”

Section: Introductionmentioning

confidence: 99%

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Synergetic role of nanoparticles and micro-scale short carbon fibers on the mechanical profiles of epoxy resin

Zhang¹,

Rasheva²,

Karger‐Kocsis³

et al. 2011

Express Polym. Lett.

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Abstract. It was demonstrated in our previous work that the combined carbon nanofibers (CNFs) and microsized short carbon fibers (SCFs) in epoxy (EP) leads to significant improvements in the mechanical properties of the matrix. In this work, the effect of nano-SiO 2 particles, having an extremely different aspect ratio from CNFs, on the tensile property and fracture toughness of SCFs-filled EP was studied. It was revealed that the combined use of SCFs and silica nanoparticles exerts a synergetic effect on the mechanical and fracture properties of EP. Application of SCFs and the nanoparticles is an effective way to greatly enhance the modulus, strength and fracture toughness of the EP simultaneously. The synergetic role of the multiscale fillers was explained by prominent changes in the stress state near the microsized fillers and the plastic zone ahead of the crack tip. The synergetic role of multiscale fillers is expected to open up new opportunities to formulate highperformance EP composites.

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Section: Fracture Toughnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synergetic role of nanoparticles and micro-scale short carbon fibers on the mechanical profiles of epoxy resin

Zhang¹,

Rasheva²,

Karger‐Kocsis³

et al. 2011

Express Polym. Lett.

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“…It must also be considered that the recyclable nature of these materials is clearly an interesting step towards the protection of the natural ecosystem. Recently, efforts to reduce the weight of automobiles by the increased use of plastics and their composites, have led to a growing interest of short-fibre-reinforced injection-moulded thermoplastics into fatigue-sensitive applications [5,6]. One of the most important applications of glass reinforced polypropylene is in automotive body panels made by low cost thermoforming techniques.…”

Section: Introductionmentioning

confidence: 99%

Fatigue strength evaluation of PPGF35 by energy approach during mechanical tests

Risitano

2021

Frattura Ed Integrità Strutturale

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“…[ 6 ] The morphology of PP has been well studied and it has been known that PP crystallizes in three different polymorphs, namely, the α-, β-and γ-form. [ 7,8 ] The crystallization into a specifi c form depends on the crystallization …”

mentioning

confidence: 99%

Investigating the Morphological Variations Due to Processing and Thermomechanical Treatment of Poly(propylene) Using Raman Microscopy

Sanoria

Damodaran

Schuster

et al. 2016

Macro Chemistry & Physics

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Differences in the Raman spectrum of the α-and β-polymorph of poly(propylene) (PP) have been identifi ed in the form of band shifts distinct for the specifi c polymorph. A new method has been developed, which can ascertain the presence of the α-polymorph. These band shifts have been used to profi le both the polymorphs and variations in the crystallinity across the whole spherulite have been ascertained by carrying out a spatially resolved profi ling of the degree of crystallinity. The crystalline domains in PP have been qualitatively assessed using the band shifts in the Raman spectra. This approach has then been applied to study local variations in the morphology of welds between PP plates, wherein the complex interplay between the heating and cooling patterns as well as the mechanical forces due to shearing gives rise to the development of a different morphological structure in the weld. Using Raman microscopy, a reduction in the crystallinity (≈18%) in the region of the weld seams and sporadic formation of β-spherulites in the weld core is observed. The methodology developed has been applied to investigate a weld between PP-H and PP-R (PP with random ethylene copolymer), to ascertain the variations occurring upon welding in such materials. various components. [ 1,2 ] Processing PP into the fi nal product regularly infers anisotropies in the melt due to shear forces, which result in structural variations in the solidifi ed polymer. The latter embody themselves in the form of spatial variations in morphology, with their length scale and variance depending on the specifi c process and conditions. These in turn have a signifi cant impact on the macroscopic properties, such as mechanical properties and crack propagation. [3][4][5] Hence, spatially mapping the morphology in a comprehensive manner is an important task in order to establish process→structure→property relationships and use these to optimize manufacturing. [ 6 ] The morphology of PP has been well studied and it has been known that PP crystallizes in three different polymorphs, namely, the α-, β-and γ-form. [ 7,8 ] The crystallization into a specifi c form depends on the crystallization

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Structure and Fracture Mechanics of Injection‐Molded Composites

Cited by 5 publications

References 31 publications

Synergetic role of nanoparticles and micro-scale short carbon fibers on the mechanical profiles of epoxy resin

Synergetic role of nanoparticles and micro-scale short carbon fibers on the mechanical profiles of epoxy resin

Fatigue strength evaluation of PPGF35 by energy approach during mechanical tests

Investigating the Morphological Variations Due to Processing and Thermomechanical Treatment of Poly(propylene) Using Raman Microscopy

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