Time-dependent failure in poly(methyl methacrylate) and polyethylene

McKenna, Gregory B.; Penn, Robert W.

doi:10.1016/0032-3861(80)90063-4

Cited by 32 publications

(19 citation statements)

References 11 publications

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“…In addition, frequency has no effect on the fatigue lifetime, which is in agreement with other fatigue analyses. 18,23,24 Figure 5a elucidates the method to perform cyclic fatigue life predictions by shifting a set of creep life data along the time axis. The magnitude of the horizontal shift a cyclic depends on the ratio of the stress amplitude σ ampl applied, the material's stress dependence σ 0 , and the wave form applied only.…”

Section: An Analysis To the Time-dependent Fatigue Failurementioning

confidence: 99%

“…On the basis of these approaches, methods were proposed to allow fatigue life estimations based on (experimental) creep data by using a cumulative damage law. 18,23,24 Rather remarkable is that these methods predict a frequency-independent time-to-failure.…”

Section: Introductionmentioning

confidence: 99%

“…25 It is in a manner similar to the cumulative damage law approaches mentioned. 18,23,24 However, our approach is based on the hypothesis that strain softening causes polymer failure and that it occurs when a critical value of plastic strain has developed (see Figure 1b). First, an analysis is presented that elaborates upon this hypothesis.…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Method To Predict Fatigue Life of Thermoplastics in Uniaxial Loading: Sensitivity to Wave Type, Frequency, and Stress Amplitude

2008

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A method is presented that allows fatigue life predictions on the basis of creep life data. The approach is based on the assumption that the time-dependent failure of polymers is determined by the intrinsic strain softening that is initiated when a critical threshold value of the plastic strain is surpassed. To facilitate fatigue predictions, an acceleration factor is defined that indicates how much faster plastic strain is accumulated by a cyclic signal compared to its static mean stress. Analytical solutions of the acceleration factor are presented for triangular and square waves, which predict that only the stress amplitude of the cyclic signal and the material's stress dependency affect fatigue life, whereas frequency plays no role. Verification using several glassy and semicrystalline polymers demonstrates that this method yields accurate quantitative lifetime predictions not only for polymers that exhibit ductile failure but also for those that display brittle fracture, provided that fracture is preceded by (localized) plastic flow.

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Section: An Analysis To the Time-dependent Fatigue Failurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Analytical Method To Predict Fatigue Life of Thermoplastics in Uniaxial Loading: Sensitivity to Wave Type, Frequency, and Stress Amplitude

2008

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“…The reported use of polyurethane coatings (McKenna, 1980) to improve the abrasion resistance of rope suggests that the processing technology is feasible. The development of viable and effective coating compositions and processes is a valid objective.…”

Section: General Conclusionmentioning

confidence: 99%

“…53 regions in which polymer molecules are closely packed, with crystallites and hydrogen bonds providing strong ýntermolecular forces. The regions of the fiber accessible to water are limited to disordered or non--crystalline rogions, and surfacs of crystallites.…”

Section: *'mentioning

confidence: 99%

Deterioration of Synthetic Fiber Rope during Marine Usage

Backer¹,

McGarry²,

Williams³

1981

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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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Time-dependent failure in poly(methyl methacrylate) and polyethylene

Cited by 32 publications

References 11 publications

An Analytical Method To Predict Fatigue Life of Thermoplastics in Uniaxial Loading: Sensitivity to Wave Type, Frequency, and Stress Amplitude

An Analytical Method To Predict Fatigue Life of Thermoplastics in Uniaxial Loading: Sensitivity to Wave Type, Frequency, and Stress Amplitude

Deterioration of Synthetic Fiber Rope during Marine Usage

Fatigue Behavior of Polymers

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