Anelastic creep of polymethyl methacrylate

Sherby, O. D.; Dorn, J.E.

doi:10.1016/0022-5096(58)90022-x

Cited by 129 publications

(57 citation statements)

References 11 publications

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“…This behavior of Figure 2a includes the same features as described for the constant rate compression test in Figure 2b: yield, (true) strain softening, and strain hardening. This is illustrated more clearly by using a so-called SherbyDorn plot, 36 Figure 3, for different levels of applied stress.…”

Section: Time-dependent Ductile Failure: Relation To Intrinsic Behaviormentioning

confidence: 99%

Quantitative Prediction of Long-Term Failure of Polycarbonate

et al. 2005

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Time-to-failure of polymers, and the actual failure mode, are influenced by stress, temperature, processing history, and molecular weight. We show that long-term ductile failure under constant load is governed by the same process as short term ductile failure at constant rate of deformation. Failure proves to originate from the polymer's intrinsic deformation behavior, more particularly the true strain softening after yield, which inherently leads to the initiation of localized deformation zones. In a previous study, we developed a constitutive model that includes physical aging and is capable of numerically predicting plastic instabilities. Using this model the ductile failure of polycarbonates with different thermal histories, subjected to constant loads, is accurately predicted also for different loading geometries. Even the endurance limit, observed for quenched materials, is predicted and it is shown that it originates from the structural evolution due to physical aging that occurs during loading. For low molecular weight materials this same process causes a ductile-to-brittle transition. A quantitative prediction thereof is, however, outside the scope of this paper and requires a more detailed study.

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Section: Time-dependent Ductile Failure: Relation To Intrinsic Behaviormentioning

confidence: 99%

Quantitative Prediction of Long-Term Failure of Polycarbonate

et al. 2005

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“…Creep experiments were performed in dead-weight loading at stress levels ranging from 200 to 1000 MPa and temperatures from 30 o to 90 ~ [8]. The strain was monitored as a function of time, whereas the plateau creep rate was subsequently determined by plotting the strain rate logarithmically vs. strain in so-called Sherby-Dorn plots [8,13]. For both the stress relaxation and creep experiments, fiber samples of 255 mm length were used, provided with cardboard tabs to improve clamping.…”

Section: B) Techniquesmentioning

confidence: 99%

“…From the creep data, the plastic flow contribution (plateau creep rate) was determined by employing the method suggested by Sherby and Dorn [13]. The Arrhenius plot of the plateau creep rate is presented in Fig.…”

Section: )mentioning

confidence: 99%

Deformation behavior of oriented UHMW-PE fibers

Govaert

Lemstra

1992

Colloid Polym Sci

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Abstract:The mechanical behavior of gel-spun, ultra-drawn, UHMW-PE fibers was investigated as a function of temperature, stress, and time under static and dynamic loading conditions. From a phenomenological point of view, two separate contributions to the deformation behavior could be distinguished, i.e., a reversible (viscoelastic) contribution and an irreversible plastic flow component. It was investigated whether or not this distinction can be rationalized on a molecular basis. The fibers were studied using static (creep) and dynamic mechanical analysis (DMA), dilatometry, and wide-angle x-ray scattering (WAXS). The results of the combined experimental observations are discussed in an attempt to relate the deformation behavior of highly oriented PE fibers to events occurring on a molecular scale.

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“…• In situ polymerization of -caprolactam in the presence of organo-clay • M n ϭ 22,200 g/mol [38] • Predominant ␥ crystalline form with also ␣ form present, from DSC, FTIR and XRD [6,11] • Young's modulus of 4.1 GPa • Crystalline index of 25%, from DSC [11] • UTS of 100 MPa Clay • Strain at fracture of less than 10% • Organo-modification: ion-exchanged montmorillonite intercalated with -amino dodecanoic acid • 2 wt% of organo-clay • Completely exfoliated, from XRD [11] PA6…”

Section: Methodsmentioning

confidence: 99%

“…The process of longitudinal strain accumulation can also be presented by a curve of the logarithm of the rate of longitudinal strain accumulation t vs. the accumulated strain Acc , as originally proposed by Sherby and Dorn [38] for creep deformation of polymeric materials. Such SherbyDorn plots are presented in Fig.…”

Section: Accumulation Of Longitudinal Deformationmentioning

confidence: 99%

Bulk fatigue damage evolution in polyamide-6 and in a polyamide-6 nanocomposite

et al. 2005

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The mechanical response of a polyamide‐6 montmorillonite clay nanocomposite and of a polyamide‐6 was monitored during axial fatigue tests performed at R‐ratios of 0.1 and −1. For both materials, two transitions were usually observed in the evolution of all the stress‐strain‐time parameters studied after similar numbers of loading cycles, suggesting interrelationships between the mechanisms of molecular reorganization. Fatigue test monitoring indicated an initial decrease in the storage modulus and a subsequent trend for this modulus to increase, especially in polyamide‐6. During all tests, a partially recoverable strain was accumulated because of viscoelastic deformation. Nanoparticles reduced this strain in the initial cyclic straining regime but not in the last regime, probably because such particles cannot inhibit viscoelastic events constrained in a volume larger than their interaction volume within the matrix. Based on the accumulated volume variation measured, the nucleation and growth of microvoids can be expected to occur in the last cyclic straining regime. POLYM. COMPOS., 26:636–646, 2005. © 2005 Society of Plastics Engineers

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Anelastic creep of polymethyl methacrylate

Cited by 129 publications

References 11 publications

Quantitative Prediction of Long-Term Failure of Polycarbonate

Quantitative Prediction of Long-Term Failure of Polycarbonate

Deformation behavior of oriented UHMW-PE fibers

Bulk fatigue damage evolution in polyamide-6 and in a polyamide-6 nanocomposite

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