Global ETD Search
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 17 of 17 for “"Tensile Creep"”.
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Tensile creep of 2024-T3 aluminum-alloy sheet under varying load conditions
… - are investigated in an effort to predict creep strains under conditions of varying loads from data obtained at constant load in the range of interest to the structural designer. A method is presented for computing an equivalent rupture stress for the varied load case using the …
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Tensile, Creep, and Fatigue Behaviors of Thermoplastics Including Thickness, Mold Flow Direction, Mean Stress, Temperature, and Loading Rate Effects
… investigation to evaluate and quantify the tensile, creep, and fatigue behaviors of two thermoplastic polymers. The effects considered in this experimental study include mold flow direction, thickness, mean stress, temperature, and loading rate. Specimens were subjected to monotonic tension, …
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Early age creep and shrinkage of emerging concrete materials
… thermal dilation. When concrete is restrained, tensile stress develops due to shrinkage and increases the probability of cracking. Early age properties, such as tensile creep, are not well understood and the availability of literature on the subject is limited. The goal of this research is to …
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Investigation of Concrete Mixtures to Reduce Differential Shrinkage Cracking in Composite Bridges
… shrinkage by decreasing shrinkage and increasing creep. . In addition, the amount of tensile creep that concrete experiences under long-term tensile stresses were quantified and compared to compressive creep values in order to gain a better understanding of how concrete behaves under tension. Test …
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Modeling Heat Transfer and Densification during Laser Sintering of Viscoelastic Polymers
… to account for the temperature dependence of the tensile creep compliance. The results of the combined-mechanism sintering model will be compared to the classic Mackenzie-Shuttleworth sintering model. A lab-scale LS unit was constructed to fabricate test specimens for model validation and to test …
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The effect of physical aging on the creep response of a thermoplastic composite
… physical aging on the linear viscoelastic creep properties of a thermoplastic composite was investigated. Radel X/IM7, an amorphous composite material considered for use in the next generation high speed transport aircraft, was studied. The operating environment for the aircraft material …
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Creep predictions for turbomachinery components
Several theories of creep and creep rupture are reviewed. Specific attention is devoted to the brittle damage theory proposed by Kachanov. Creep, damage and life predictions for rectangular or circular cross section beams under bending and tensile loads are presented. Comparison with data for a Ni …
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Rheology Of Cross-Linked Polymers And Polymer Foams: Theory And Experimental Results
… to loading which results in stress relaxation or creep. Models using springs/dashpots or Volterra integrals are capable of predicting the material response, but place little or no emphasis on the reasoning behind the response. This research proposes a microscopic reasoning behind polymer chain …
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Multiscale In-Situ Characterization of Crystal Orientation, Temperature, and Microstructure Effects on Creep Defromation of Pure Magnesium and Mg-Al-RE Alloys
… Their broader use is restricted by limited creep resistance and pronounced anisotropy of plastic deformation, especially at elevated temperatures. This thesis examines how crystal orientation, temperature, and β-phase morphology govern creep behavior in pure Mg and AE44 alloys. Novel in-situ …
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Creep resistance of directionally solidified eutectic ceramics : experiments and model
The creep resistance of the directionally solidified eutectic ceramic of Al₂0₃/c-ZrO₂(Y₂0₃) was studied in the temperature range of 1200-1520⁰C both exprimentally and by the mechanistic dislocation model. The topologically continuous majority phase of Al₂0₃ has a nearly perfect growth texture in …
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Determination of creep, fatigue and ageing characteristics of non-metallic strength members in optical communication cables
Innovative tensile, creep, fatigue, environmental weathering and ageing test methods have been developed to compare the ultimate and relative performances of four commercial brands of non-metallic continuous multi fibre strength member yarns, and one jointed non-metallic multi fibre strength member …
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Characterization and Lifetime Performance Modeling of Acrylic Foam Tape for Structural Glazing Applications
… glazing tape in both shear and tension. Creep rupture testing results provided the failure time at a given static load and temperature, and ramp-to-fail testing results provided the ultimate load resistance at a given rate of strain and temperature. Parallel testing was conducted on three …
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Surface Orientation Dependent Corrosion Damage and Temperature Dependent Mechanical Property Degradation of Sensitized AA5083-H116 Alloys
… and subsequent mechanical (tension and tensile creep) testing. To connect the laboratory studies to the field exposure, Novelis 5083-H116 was sensitized at 100°C; dog bone samples were created and exposed for two years in a beach environment to investigate possible sensitization and …
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Balancing asphalt mixes containing recycled materials for optimum field performance
… thorough laboratory testing, including indirect tensile creep compliance and strength, Hamburg wheel tracking test, and the Illinois flexibility index test (I-FIT) was conducted to evaluate thermal cracking susceptibility, rutting, and cracking resistance, on plant-mixed lab-compacted (PMLC) …
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Viscoelastic and fracture behaviour of polyolefin based nanocomposites
… properties, in terms of elastic modulus and tensile properties at yield and at break. Linear low density polyethylene (LLDPE) is widely applied in several industrial applications, especially for the production of transparent high performance film for the packaging industry. The objective of …
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The effect of environmental aging/exposure on the durability of high performance polymeric composites
… composites, via measurement of the viscoelastic (creep) properties. Accelerated characterization techniques were employed to predict long-term physical aging behavior. Fiberite 954-2 (a thermoplastic toughened cyanate ester resin) and its graphite-reinforced composites, and Fiberite ITX (a …
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Fractionated reclaimed asphalt pavement as a coarse aggregate replacement in a ternary blended concrete pavement
… FRAP replacement tested. The compressive, split tensile, and flexural strengths all decreased with increasing coarse FRAP contents. The compressive strength decreased up to 39% with a FRAP content of 50%. Similarly, with 50% FRAP, the split tensile strength decreased as much as 52% and the …