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.
Results
Showing 1 to 13 of 13 for “"Micromechanical Modeling"”.
-
Micromechanical modeling of concrete at early age
The focus of this research is a micromechanical characterization of Portland cement concrete at early age (less than 28 days). Concrete’s viscoelastic properties change significantly at early age due to solidification of its matrix component. Bažant’s solidification theory models concrete as a …
-
Finite element based micromechanical modeling of periodic composite microstructures
… chosen and studied using finite element based micromechanical models. Simulations were conducted parametrically varying the volume fraction with a fixed strut length, the proportion of the polymer coating to the elastomer core used in the composite struts (coating fraction), and the size of the …
-
Several aspects of polycrystalline ice behavior based on micromechanical modeling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
-
Micromechanical modeling of the toughening mechanisms in particle-modified semicrystalline polymers
… heterogeneous material systems via a series of micromechanical models. The case of polyamide-6 modified with spherical elastomeric particles was modeled. The finite element method was employed to conduct a parametric study on the deformation of these systems. It was found that the mechanical …
-
Multiscale micromechanical modeling of the thermal/mechanical properties of polymer/clay nanocomposites
… (We) of clay. Continuum-based composite modeling reveals that the enhanced properties are strongly dependent on particular features of the second-phase "particles"; in particular, the particle volume fraction (f,), the particle aspect ratio (L/t), and the ratio of particle …
-
MIcromechanical modeling of composite materials in finite element analysis using an embedded cell approch
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
-
Development of a Micromechanical Modeling Approach to Predict Asphalt Mixture Stiffness Using the Discrete Element Method
The MDEM approach was also utilized in the design and optimization of physical test equipment such as hollow cylinder tensile tester. In addition, tensile strength simulations and creep stiffness prediction are also very promising by using the MDEM approach.
-
Micromechanical Modeling of the Interaction of Diffusion Mechanisms and Surface Energy With Nonlinear Material Deformation: Applications to Powder Densification and Void Growth
Void growth in nonlinearly creeping solids under plane-strain conditions is studied in the fifth chapter. Numerical results reveal a rich variety of solutions; in general, void shape is controlled by the strength of the diffusion process relative to the bulk creep process, whereas void size depends …
-
Viscoelastic Properties of Polymer Composites During Processing
… modeled for the purpose of composites process modeling. Measurement of matrix viscoelastic properties during cure was accomplished through two experimental approaches, each suited to a particular range of cure states. To investigate the material behavior during later stages of cure after …
-
Invariant mechanical properties of calcium-silicate-hydrates (C-H-S) in cement-based materials : instrumented nanoindentation and microporomechanical modeling
… namely instrumented indentation, and micromechanical modeling namely homogenization techniques, in an attempt to quantify the mutli-phase, multi-scale heterogeneity observed in all cement-based materials. We report a systematic framework for mechanically enabled imaging, measuring and …
-
Micromechanics of deformation and abrasive wear of fiber-filled elastomers
… the abrasive wear of elastomers were observed. Micromechanical modeling of the abrasive wear of unfilled elastomers predicted the formation of the observed abrasion patterns. Modeling of fiber-filled elastomers indicated that fibers should have no effect on the aggressive wear process. …
-
Microporoelastic modeling of organic-rich shales
… We introduce an original approach for micromechanical modeling of organic-rich shales which accounts for the effect of organic maturity on the overall anisotropic poroelasticity through morphology considerations. This morphology contribution is captured by means of an effective media …
-
Developments in large scale discrete element simulations with polyhedral particles
… simulations with realistic polyhedral particle modeling, aiming to provide a better insight into the underlying mechanisms of the granular materials and enhance the predictive capabilities for engineering applications. In this dissertation, the research effort is made in two different ways to …