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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 25 for “"Thermo-Mechanical Behavior"”.
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Thermo-Mechanical Behavior of Polymer Composites Exposed to Fire
… and decomposition is developed to predict the thermo-mechanical behavior and compressive failure of polymer matrix composites (PMCs) subjected to heat and compressive load. An overlaid element technique is proposed for incorporating the model into commercial finite element software ABAQUS. The …
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Thermo-Mechanical Behavior During Steel Continuous Casting in Funnel Molds
… been developed to investigate the thermal and mechanical behavior of the solidifying steel shell in continuous casting funnel molds, with the goal of understanding the effect of funnel shape on the solidifying steel shell. The numerical models have been calibrated with plant measurements from …
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Thermo-mechanical behavior of silicon at nanoscale — an in situ investigation
… the micrometer and submicrometer scale exhibit mechanical properties that are substantially different from bulk materials. With the increasing miniaturization of devices, accurate characterization of micro/nanoscale materials and fundamental understanding of their deformation mechanism are …
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MODELING OF THERMO-MECHANICAL BEHAVIOR OF NITINOL ACTUATOR FOR SMART NEEDLE APPLICATION
… needle, there is a need to understand Nitinol thermo-mechanical behaviors. Various existing SMA constitutive models were investigated and compared. Since SMA is used as an actuator in this project, only one dimensional constitutive models are considered. Two distinct models with different phase …
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Thermo-Mechanical Behavior of Energy Piles: Full-Scale Field Testing and Numerical Modeling
… yet there are still pending questions on their thermo-mechanical behavior. The change in temperature along energy piles, resulting from their employment in heat exchange operations, causes axial displacements, thermally induced axial stresses and changes in mobilized shaft resistance which may …
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Thermo-mechanical behavior of steel in the continuous casting process from meniscus to caster exit
… model has been developed to quantify the thermo-mechanical behavior of the solidifying strand widefaces from meniscus to caster exit. A constitutive model is also developed for steel multiphase mixtures near the eutectoid transformation. This new constitutive model extends the temperature …
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Investigating the Thermo-Mechanical Behavior of Highly Porous Ultra-High Temperature Ceramics using a Multiscale Quasi-Static Material Point Method
… seeks to computationally characterize the thermomechanical properties of multiscale porous UHTCs, specifically titanium diboride, and validate those results against experimental results so as to build confidence in the model. An implicit quasi-static variant of the Material Point Method …
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Multi-Scale Thermo-Hydro-Mechanical Behavior of Saturated Earth Materials
… changes. Recorded temperature variations around thermo-active infrastructure and within the active layer of the permafrost reveal the cyclic and transient nature of these temperature changes. Previous studies on the thermo-mechanical behavior of soils did not consider the effect of the …
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Modelling of thermo-mechanical and irradiation behavior of metallic and oxide fuels for sodium fast reactors
… and reliable code to model the irradiation behavior of metal and oxide fuels in sodium cooled fast reactors is developed. Modeling capability was enhanced by adopting a non-empirical mechanistic approach to the extent possible, so that to increase the ability to extrapolate the existing …
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Thermomechanical effects of ground-based directed energy weapons on satellites and Intercontinental Ballistic Missiles
Thermo mechanical modeling and simulation of a satellite and intercontinental ballistic missile assumes importance due to the increased interest in assessing the potential of such attacks. Effective and innovative methods are sought in assessing the structural integrity of such structural …
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Development of rate-dependent thermoplastic constitutive models for numerical analysis of ceramics at high-temperature
Three constitutive models for the mechanical description of the behavior of ceramic materials are developed, implemented into a numerical code, calibrated on experimental data, and validated. - The first model is elastic-plastic and addresses the cold compaction of ceramic powders, combining …
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Atomistic simulations of elastic-plastic deformation of amorphous polymers
… of the fundamental connections between the mechanical behavior and underlying chemical structure becomes imperative. In this work, the thermo-mechanical behavior and the molecular-level origins of plastic deformation of an amorphous glassy polymer were studied using atomistic simulations. …
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Optimization of conformal cooling channels in 3D printed plastic injection molds
… channels, which dont impart optimal thermal (or thermos-mechanical) per- formance. Moreover, reducing the cycle time in plastic injection molding has become significantly important to the industry nowadays. One approach that has been pro- posed is to use conformal cooling channels. With the advent …
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Modeling the mechanical behavior of amorphous metals by shear transformation zone dynamics
A new mesoscale modeling technique for the thermo-mechanical behavior of amorphous metals is proposed. The modeling framework considers the shear transformation zone (STZ) as the fundamental unit of deformation, and coarse-grains an amorphous collection of atoms into an ensemble of STZs on a mesh. …
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Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals
… techniques, 2) Investigating experimentally the thermo-mechanical behavior of NiTiNb SMA which is used for this research, 3) Testing concrete cylinders wrapped with SMA spirals and Glass-FRP (GFRP) wraps, 4) Conducting quasi-static lateral cyclic tests on four 1/3-scale RC columns retrofitted …
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Developing a new interatomic potential and atomistic study of NiTiHf
… exists a lack of comprehensive research on the thermo-mechanical behavior of these HTSMAs. Computational simulations are a very cost-effective and feasible approach for addressing this shortcoming. Among computational methods, molecular dynamics (MD) simulation as an atomistic method offers …
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Nucleation and growth kinetics of tin and tin -silver alloy during initial stages of electrodeposition
… melting point, good creep resistance and thermo-mechanical behavior.</p><p>The initial stage of electrodeposition, or the formation of small clusters of atoms (nuclei), is significant in the overall electrodeposition kinetics, as well as the appearance, structure, and properties of the …
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Development of constitutive models for thin thermoelastic interphase in composite materials
… reinforcements that enhance their overall thermo-mechanical performance. At the micro-mechanical scale, a distinct interphase forms between the constituent materials, characterized by its own unique set of properties. The thermo-mechanical behavior across this interphase is of critical …
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Constitutive modeling of glassy memory polymers
… model has been developed to capture the thermo-mechanical behavior of glassy shape memory polymers using elements of nonlinear mechanics and polymer physics. The key feature of this framework is that a body can exist stress free in numerous natural configurations, the underlying natural …
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Structure-property behavior of novel high performance thermoplastic and thermoset structural adhesives and composite matrix resins
… by intrinsic viscosity, DSC, TGA, and thermomechanical measurements. Molecular weight control was successful and these polyimides were thermally stable via dynamic TGA up to 500°C. Flame resistance was suggested by the 10-20 % of char yield observed in air at 750°C. Good tensile modulus …
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