The effect of molecular weight on fatigue crack propagation in nylon 66 and polyacetal

Bretz, P. E.; Hertzberg, R. W.; Manson, J. A.

doi:10.1002/app.1982.070270527

Cited by 24 publications

(18 citation statements)

References 3 publications

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“…Owing to their dimension and the DCG behavior shown in Figure , they are interpreted as DCG bands. This is in accordance with the studies of Bretz et al and Hertzberg et al in which various Delrin types were examined regarding their fatigue crack growth properties. It was discussed by Hertzberg et al that for many polymers the width of the DCG band correlates well with the size of the plastic zone according to the Dugdale model (eq.…”

Section: Resultssupporting

confidence: 92%

“…The determined critical stress intensity factors of Tenac and Delrin are summarized in Table . Compared to the results reported in the literature (homopolymer and copolymer), the values listed in Table are higher. This is attributed to the comparatively high molecular weight of the materials used in our study and the rather small thickness of the CT specimens (4 mm).…”

Section: Resultscontrasting

confidence: 69%

“…Comparing the results with values of Delrin 100 reported in the literature (Table ), both materials show good agreement of the weight‐average molecular weight. However, the polydispersity index is slightly higher than reported by Bretz et al…”

Section: Resultscontrasting

confidence: 58%

“…Figure shows the different regimes which can be observed on these surfaces: razor blade prenotch, fatigue crack growth area (stable and unstable crack growth), transition regime, and spontaneous crack growth area. The fatigue crack growth area is characterized by an intense white appearance in the light microscope which was previously observed for POM and other semi‐crystalline polymers . Owing to the white color, it looks very similar to the plastic zones of the monotonically loaded CT specimens.…”

Section: Resultssupporting

confidence: 54%

“…The time dependence of POM and its effects on the rolling performance of bearing elements were analyzed in the previously published studies . In contrast, the information regarding fatigue of the bearing elements has been based on the literature so far …”

Section: Introductionmentioning

confidence: 99%

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Fracture mechanical analysis of two commercial polyoxymethylene homopolymer resins

Berer

Pinter

Feuchter

2014

J of Applied Polymer Sci

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This research addresses the fracture mechanical analysis of two commercially available polyoxymethylene homopolymer resins. Two types of experiments are used: monotonic fracture toughness tests and cyclic fatigue crack growth tests. The resulting total lifetimes in the fatigue crack growth tests are split up into the appropriate parts of crack growth initiation and fatigue crack propagation. Fracture surfaces of monotonic and cyclic tests are analyzed using light microscopy and scanning electron microscopy. Besides the mechanical tests, the morphology within the used compact tension specimens is examined in detail by using differential scanning calorimetry, small-and wide-angle X-ray scattering, and polarized light microscopy. The results are analyzed and discussed, considering observations in the previous studies published in the literature. It is shown that both materials can be well analyzed using linear elastic fracture mechanics and their fracture mechanical properties are presented in conjunction with a detailed documentation of the microstructure.

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Section: Resultssupporting

confidence: 92%

Section: Resultscontrasting

confidence: 69%

Section: Resultscontrasting

confidence: 58%

Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Fracture mechanical analysis of two commercial polyoxymethylene homopolymer resins

Berer

Pinter

Feuchter

2014

J of Applied Polymer Sci

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Fatigue Behavior of Polymers

Lesser

2002

Encyclopedia of Polymer Science and Technology

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Polymers and polymer‐based composites are increasingly displacing more traditional materials in a wide variety of engineering applications, and as such characterization of their fatigue behavior is of utmost importance. This article presents a general overview of the fatigue behavior of polymers. After a brief introduction that includes general terminology, the effects of test conditions (sample geometry, loading frequency, etc) are discussed. The effects of these conditions are also discussed in relevance to both the high cycle and low cycle fatigue behavior. Current models for predicting fatigue life are also reviewed, including cumulative damage theories and fatigue crack propagation models. Morphological and environmental effects are then discussed over a broad range of semicrystalline, amorphous, and modified polymer systems.

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