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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Master Curve"”.
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Comparison of Creep Compliance Master Curve Models for Hot Mix Asphalt
… a base and a surface mix. Creep compliance master curves (CCMC) were developed by shifting the curves to a reference temperature using time-temperature superposition. Three mathematical functions, Prony series, power and sigmoidal, were fitted to the experimental data using regression …
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EXPLORING THE MASTER CURVE PARAMETERS FOR EFFICIENT PERFORMANCE GRADING OF ASPHALT BINDERS FROM THE UNITED STATES OF AMERICA
… Temperature Performance Grade (ITPG), and master curve parameters under slow and fast cooling rates. Significant correlations between DSR indicators at different cooling rates were observed. Considering efficiency in time consumption, fast cooling emerges as the preferred method for DSR …
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Exploring the Black Space of Compressive and Shear Modulus
… with the standard analysis generating a Master Curve. One alternative to the master curve approach is a Black Space diagram, which is a rheological plot that can delineate either dynamic modulus |E*| or shear modulus |G*| vs. phase angle (δ). In this study, four asphalt binders were …
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Evaluación computacional del efecto de la pérdida de constricción en la tenacidad de fractura de la vasija de reactores nucleares
La aplicación de la "Master Curve" en la evaluación de la integridad estructural de la vasija a presión del reactor se encuentra incluida en el Código ASME a través de varios Code Cases. Sin embargo, el establecimiento de márgenes no está definido, en concreto el margen necesario a aplicar cuando …
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Linear and Nonlinear Viscoelastic Characterization of Proton Exchange Membranes and Stress Modeling for Fuel Cell Applications
… was characterized over a period of time. Hygral master curves were constructed noting hygral shift factors, followed by thermal shifts to construct a hygrothermal master curve. This process was reversed (thermal shifts followed by hygral shifts) and was seen to yield a similar hygrothermal master …
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Time, temperature and frequency viscoelastic behavior of commercial polymers
… lambda, as a function of real time, t, from the master curve obtained by TTSP. Dynamic Mechanical Analysis (DMA) tests were done to get complex relaxation modulus, E*(o), as a function of frequency. Frequency Temperature Superposition (FTSP) was done to extend the frequency range. Mathematical …
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Development of tension and compression creep models for wood using the time-temperature superposition principle
… was shifted along the log-time axis to obtain a "master" curve that describes the creep response of the specimens. All compliance curves also required vertical shifting. The experimental horizontal shift factors followed the Arrhenius formulation that describes the shift factor relation for …
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Effects of Long-Term Creep on the Integrity of Modern Wood Structures
… superposition was applied to form a master curve that extended for a maximum of 2 years. The horizontal shift factors followed an Arrhenius relation with activation energies ranging between 75 and 130 kJ/mole. It was not possible to superpose the compliance curves at 70 and 80° C, …
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Fracture Behavior Characterization of Conventional and High Performance Steel for Bridge Applications
… Analysis includes the application of the master curve methodology to statistically characterize fracture behavior in the ductile to brittle transition region. In addition, a database of historic bridge fracture toughness data was compiled and re-analyzed using plasticity corrections to …
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Gelation Kinetics of Fumed Silica-Alcohol Suspensions
… times for all the alcohols were captured on a master curve requiring two parameters. The two parameters, the stability ratio and critical volume fraction, describe the two regimes of gelation. At low concentrations, gelation occurs due to aggregation of the particles diffusing over a potential …
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Mechanistic-Empirical Evaluation of Pavement Damage and Cost Attributed to Overweight Single-Trip and Multi-Trip Scenarios in Nevada
… relationships between the ACdynamic modulus master curve parameters and the respective pavement responses atvarious locations within the structure were taken into consideration. In fact, master curvesof pavement responses were constructed using the same non-linear models used in …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
… geometry. The power-law model was fitted to the master compliance curves to calculate the m-value and the master curves were compared to the master curve obtained from the IDT creep compliance test.
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Dynamic Mechanical Properties of Resilin
… dynamic mechanical properties over the entire master curve. The glass transition frequency of resilin in water at 22°C was found to be 106.3 Hz. The rubber storage modulus was 1.6 MPa, increasing to 30 MPa in the glassy state. At 50 Hz and 35% strain over 98% of the elastic strain energy can …
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Characterization of the Viscoelastic Fracture of Solvated Semi-Interpenetrating Polymer Network Silicone Hydrogels
… shear tests in order to generate relevant master curves and corresponding thermal shift factors of such properties as shear relaxation modulus, dynamic moduli, and the loss factor. Concurrently, the cohesive fracture properties were studied by utilizing a "semi-infinite" strip geometry …
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Developing archaeomagnetic dating in the British Iron Age.
… section of the British secular variation curve (SVC). These data have been incorporated into the British archaeomagnetic dataset that now comprises over 1000 magnetic directions and will be used to generate future British SVCs. The potential of the near continuous records of geomagnetic …
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Relaxations in molecularly thin simple liquid films:linear viscoelasticity and non-linear response to shear
… film thicknesses were found to superpose onto a master curve when shifted horizontally and vertically. The successful superposition of the frequency spectra of both predominantly viscous and elastic response was concluded to show that a discontinuous phase transition was not involved in the …
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Rheology of molten polystyrene with dissolved gases
… data of gas-loaded systems onto a single master curve, confirming that viscosity reduction by presence of dissolved gas can be represented quantitatively through the concentration shift factor. The extended free volume model was developed for the theoretical prediction of viscosity …
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Constraint and Ductile Tearing Effects on the Cleavage Fracture of Ferritic Steel
… approach developed here utilizes the so-called Master Curve standardized in ASTM Test Method E1921-02 to provide the needed temperature vs. toughness dependence. Over the mid-to-upper region of the DBT, the brittle transgranular cleavage and ductile tearing are competing failure mechanisms in …
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The effect of the interphase/interface region on creep and creep rupture of thermoplastic composites
… at elevated temperatures for J2 composites. A master curve of each composite was generated. The shift factors obeyed the Arrhenius type equation. The activation energies of composites were approximately the same. The creep response of the AU4/J2, AS4(2)/J2, and AS4CGP/J2 composites were not …
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Examination of the Aging Properties of Novel Cyanate Ester Thermosets and the Subsequent Evaluation of the Material under Application Conditions
… cured resin and a family of isothermal modulus curves was established. These data were then shifted, following WLF theory, to create a master curve of storage modulus with respect to measurement frequency. The resultant master curves allowed the prediction of long term mechanical behavior of the …
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