Mechanisms of fatigue damage and fracture in semi-crystalline polymers

Bretz, P. E.; Hertzberg, R. W.; Mason, John A

doi:10.1016/0032-3861(81)90145-2

Cited by 35 publications

(22 citation statements)

References 14 publications

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“…However, quantitative correlation between the crack increment and the damage state cannot be given yet. Although, the damage accumulation processes were discussed microscopically for some kinds of polymers in literature [1,15,18,27], no proper parameters were used to describe the damage accumulation state at the fatigue crack tip.…”

Section: Fatigue Crack Propagation Processmentioning

confidence: 99%

“…Several researches studied the effects of loading parameters and microstructures on the fatigue crack growth behaviors of polymers [1e12]. Bretz et al [1] proposed a cyclic damage mechanism to explain the crack tip deformation patterns. A simple viscoelastic model was presented to explain the strong influence of molecular weight on fatigue crack propagation rates [2].…”

Section: Introductionmentioning

confidence: 99%

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Overload effect on the fatigue crack propagation of PC/ABS alloy

Fang

Wang

2007

Polymer

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Section: Fatigue Crack Propagation Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overload effect on the fatigue crack propagation of PC/ABS alloy

Fang

Wang

2007

Polymer

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“…In general, there was much evidence of softening and drawing, especially in zone A. Interestingly, zone A, which exhibited a honeycomb structure, resembled the surface of fatigue-cracked low-density polyethylene (22), in which failure appeared to occur by the growth and coalescence of microvoids…”

Section: Fatigue Crack Propagationmentioning

confidence: 99%

Fatigue crack propagation in amorphous poly(ethylene terephthalate)

Ramírez

Manson

Hertzberg

1982

Polymer Engineering & Sci

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Earlier studies of fatigue crack propagation (FCP) in polymers have shown a general superiority of crystalline relative to amorphous polymers in terms of FCP resistance. In order to study in detail the effect of crystalline content and character on FCP rates, poly(ethylene terephthalate) (PET) was selected as a convenient material in which a wide range of crystallinity can be obtained. To provide a baseline for comparison, FCP rates were determined for essentially amorphous polymers covering a range of molecular weight. Surprisingly, the essentially amorphous PET turned out to be as resistant to FCP as the best crystalline polymers so far observed. In this paper, several observations about FCP rates and fracture topography are reported: FCP rates agree well with the Paris equation over a wide range of ΔK; in any case, the higher the molecular weight, the greater the crack growth resistance according to the Manson‐Hertzberg relationship previously established. Fracture surface analysis revealed evidence of softening and drawing, as well as extensive plastic deformation. We suggest that PET can undergo, under cycling loading, both extensive drawing and actual crystallization at the crack tip to form an efficient, crack‐resistant network. Thus, PET appears to be the first thermoplastic observed to be self‐reinforcing in fatigue.

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“…Most of the experimental techniques that have been used to study such phenomena are based upon optical and electron microscopy. [2,3] However, these methods have several limitations, which include relatively poor resolution (for optical microscopy) and problems associated with sample preparation (for transmission electron microscopy or TEM). In particular, TEM requires the use of thin sample sections, which are typically cut with a diamond or glass blade, risking preparationinduced sample modification.…”

Section: Introductionmentioning

confidence: 99%

Microfocus X‐Ray Scattering Scanning Microscopy for Polymer Applications

Zafeiropoulos

Davies

Roth

et al. 2005

Macromol. Rapid Commun.

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Summary: The fracture properties of polymers are one of the key parameters that define their service life and limit their applications. One of the most interesting and important questions is how the molecular architecture and the structure of polymers at nanolength scales influence their fracture properties. X‐ray scattering is a powerful means of probing bulk structures at the nanometre scale. It can therefore provide a wealth of information relating to such structure‐property relationships. In the present study, synchrotron radiation microfocus small‐angle X‐ray scattering is used to investigate the damage area ahead and around the crack tip in polyamide 6 (PA6). The results reveal that the damage area propagates far beyond the visible crack, and inside the damaged zone platelet‐shaped cracks/voids are formed. magnified image

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Mechanisms of fatigue damage and fracture in semi-crystalline polymers

Cited by 35 publications

References 14 publications

Overload effect on the fatigue crack propagation of PC/ABS alloy

Overload effect on the fatigue crack propagation of PC/ABS alloy

Fatigue crack propagation in amorphous poly(ethylene terephthalate)

Microfocus X‐Ray Scattering Scanning Microscopy for Polymer Applications

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