Fracture toughness and crack growth mechanism for multiphase polymers

Zhang, M.-J.; Zhi, Fu; Su, X.

doi:10.1002/pen.760291612

Cited by 23 publications

(3 citation statements)

References 5 publications

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“…More features exist on the fracture surfaces of some other materials, such as polystyrene (PS), polycarbonate (PC), acrylonitrile–butadiene–styrene (ABS) copolymer, polypropylene (PP), high‐density polyethylene (HDPE), and epoxy resin 4–17. Conic‐shaped patterns9–11, 17 are often seen on the fracture surfaces when relatively slow crack growth has taken place, as shown in Figure 1. For rapidly moving cracks in these materials, irregular ‘mackerel’ or ‘patch’ patterns are found on fracture surfaces 1, 8, 11, 14…”

Section: Distinctive Patterns On Fracture Surfaces Of Polymersmentioning

confidence: 99%

Computer simulation of conic‐shaped patterns on fracture surfaces of polymers

Luo

Yang

2003

J of Applied Polymer Sci

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Fractographic analysis, using scanning electron microscopy, is an important method to study polymer fracture behavior. There are several distinctive patterns on fracture surfaces, such as radial striations, regularly spaced 'rib' markings, and conic-shaped patterns. The conic-shaped pattern is the intersection locus of a moving planar crack front and a radially growing circular craze or secondary crack front. In this paper, the effects of the ratio of crack velocity to growing craze or secondary crack velocity on the shape of intersection loci are discussed using computer simulations. It is shown that when the ratio of crack velocity to craze or secondary crack velocity (ȧ/ċ) increases progressively, the fracture surface pattern changes from a parabola or a prolate parabola to an ellipse and finally to an approximate circle. Therefore, the crack growth velocity can be estimated based on the fracture surface morphology and then related to the fracture processes as well as to the ductile-brittle transition or toughening mechanism of brittle polymers.

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Section: Distinctive Patterns On Fracture Surfaces Of Polymersmentioning

confidence: 99%

Computer simulation of conic‐shaped patterns on fracture surfaces of polymers

Luo

Yang

2003

J of Applied Polymer Sci

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“…35, No. 6 onset of stable tearing. The higher the value of J,, the more resistant to crack growth, hence the tougher, is the material.…”

Section: Introductionmentioning

confidence: 99%

Enhanced polycarbonate toughness. I: Measurement methodology

Kim

McGarry

Riew

1995

Polymer Engineering & Sci

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The J,, values for core-shell-particle-toughened polycarbonate were determined at different temperatures and at 0, 2.5, 5.0, 7.5, and 10.0 phr particle content by six similar methods, using compact tensile specimens. At the 2.5 phr toughener level, the J,, values ranged from 2878 to 6100 J/m2, and at 7.5 phr, they ranged from 6125 to 10,760 J/m2, dependent only upon how the same J, -h a data were interpreted. This indicates that more work will be required before a reliable method of J,, measurement that can be applied to tough polymers is achieved. 1992).

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“…This procedure gave a J IC (not J 0.2 ) value for the blends Y and Z. This method of plotting J against Dl has been used by other workers [20,27,49] for cases where the conventional approach of plotting J vs. Da was not possible. To demonstrate the difference between Da and Dl, a sample of blend Y was loaded until crack growth was visible, on the surface, by naked eye.…”

Section: Fracture Behaviour Of Isotropic X Y and Zmentioning

confidence: 99%

Roll-drawing and die-drawing of toughened poly(ethylene terephthalate). Part 2. Fracture behaviour

Mohanraj

Chapleau²,

Ajji³

et al. 2005

Polymer

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Roll-drawing and die-drawing of toughened poly(ethylene terephthalate) AbstractOrientation of polymers in the solid-state has been used for a long time in enhancing the properties of the products and the die-drawing process at Leeds University (UK) and the roll-drawing process at IMI (Canada) have been used to produce oriented polymer products in a wide variety of shape and sizes. In this work, we explore the fracture behaviour of isotropic and oriented toughened poly(ethylene terephthalate) (PET) in order to improve the toughness of the oriented products in a direction other than the principal draw direction.The fracture behaviour of isotropic and oriented PET homopolymer and the two PET blends (containing 10% polyethylene elastomer and 10% compatibilized elastomer) was studied using the multi-specimen J-integral approach. In the isotropic case, the compatibilized blend had higher toughness than the homopolymer and the non-compatibilized blend. The oriented sheets from the die-drawing and roll-drawing process, drawn to a draw ratio of 3.2 at 170 8C were tested with the initial notch both parallel and perpendicular to the draw direction. For the former case, the compatibilized blend was tougher and in the other direction the drawn homopolymer was tougher than the blends. At similar draw ratios, the fracture behaviour and the toughness of the oriented sheets from the die-drawing and roll-drawing processes were identical. q

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Fracture toughness and crack growth mechanism for multiphase polymers

Cited by 23 publications

References 5 publications

Computer simulation of conic‐shaped patterns on fracture surfaces of polymers

Computer simulation of conic‐shaped patterns on fracture surfaces of polymers

Enhanced polycarbonate toughness. I: Measurement methodology

Roll-drawing and die-drawing of toughened poly(ethylene terephthalate). Part 2. Fracture behaviour

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