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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 23 for “"constitutive properties"”.
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Comparing In Situ and Bulk Constitutive Properties of a Structural Adhesive
… methods. To obtain the adhesive design properties, tests are often performed on bulk tensile and bonded shear specimens. Questions remain about the relationship between properties obtained from in situ adhesive joints and bulk adhesive specimens. As a result, an experimental plan was …
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Effect of Constitutive Properties of Earth Media on Outrunning Ground Shock From Large Explosions
Made available in DSpace on 2014-12-10T22:22:05Z (GMT). No. of bitstreams: 1 7412030.pdf: 17508228 bytes, checksum: db282f2767ec665052e3a8eb75b508a2 (MD5) Previous issue date: 1973
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Utilizing equivalent circuits to describe the strain- and temperature-dependence of electromagnetic metamaterials
… a laboratory setting. They achieve these novel properties by utilizing geometry and structure, as opposed to a strict reliance on chemical composition, to dictate their interactions with electromagnetic (EM) radiation. As such, metamaterials significantly expand the toolkit from which engineers …
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On problems in homogenization and two-scale convergence
… order as the interface thickness. Moreover, the constitutive properties of the material occupying the bodies adjacent to the interface are assumed to be described by some convex energy densities of quadratic growth. In contrast, the interface material is supposed to show extremal" constitutive …
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Mechanics of load transfer in cable-reinforced materials
… is considered. Special attention is given to the constitutive properties of the cable, which exhibits coupling between extension and torsion. Displacement compatibility between cable and half-space is enforced through the use of approximate bond conditions. Two alternative tangential bond …
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Simulation of High-velocity Penetration for Rigid Projectile into Plain Concrete Target using Discrete Element Method
… and strain-rate were also conducted to study the constitutive properties in this thesis.
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Measuring and Modeling the Time-Dependent Response of Cementitious Materials to Internal Stresses
… composite approach considering the viscoelastic properties of the cement paste matrix and the complex paste-aggregate interaction that results in internal stresses affecting the composite deformation. Finally, permeability is indirectly measured by considering the short-term time-dependent …
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Multiphase immiscible flow through porous media
… medium system with constant air phase pressure. Constitutive relationships for fluid conductivities and saturations as functions of fluid pressures which may be calibrated from two-phase laboratory measurements, are employed in the finite element program. The solution procedure uses iteration by …
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A Computer Vision Approach to Stress Determination in Blisters, and a Fatigue-Based Method Framework for Testing Defect Development
… membrane blister test, however, have required constitutive properties of the membrane (Young's modulus and Poisson's ratio), along with Hencky's classic model for circular membrane stresses. Herein we describe an analysis method and computer vision imaging technique that are capable of …
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Finite element-based failure models for carbon/epoxy tape composites
… for measurement of nonlinear interlaminar constitutive properties in tape composites have been recently developed at Georgia Institute of Technology. Development of methods for accurate predictions of failure in carbon/epoxy tape laminate configurations with complex lay-ups is the main …
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Design and Performance of Load Bearing Shear Walls Made from Composite Rice Straw Blocks
… Stak Blocks in a load-bearing wall application. Constitutive properties of the composite straw material such as yield strength and elastic stiffness were determined and then compared to conventional straw bale. Next, the decision was made to prestress the walls to create a more effective …
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INVESTIGATION OF THE HYDRAULIC CHARACTERISTICS OF COASTAL REDWOODS THROUGH ANALYSIS OF WATER DYNAMICS
… is based on the physiological and architectural properties of the tree. In this thesis, I aim to answer the question of how the redwood is designed to transport and store water. I will investigate the hydraulic characteristics of the coastal redwood through analysis of water dynamics as captured …
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Thermoplastic Sizings: Effects on Processing, Mechanical Performance, and Interphase Formation in Pultruded Carbon Fiber/Vinyl-Ester Composites
… composites was fundamentally predicted from the constitutive properties of K-90 PVP/Derakane™ interdiffusion and fundamental mass transport equations. The K-90 PVP sizing material interdiffusing with the Derakane™ matrix was found to be dissolution controlled. The dissolution diffusion …
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Geometrically-Linear and Nonlinear Analysis of Linear Viscoelastic Composites Using the Finite Element Method
… as compressible. Furthermore, the macroscopic constitutive properties for fiber-reinforced composites are assumed to be known and are not determined using the matrix and fiber properties along with the fiber volume fraction. Hygrothermo-rheologically simple materials are considered for which a …
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Stress Transmission in a Granular System
… body that can deform according to a prescribed constitutive properties with appropriate friction contact conditions. The insights that can be gained into the stress transmission mechanisms and yield initiation within the grains are shown in a case study of an intact sand subjected to 1D …
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Polypropylene fiber reinforced concrete in railway crossties
… The study involved a thorough review of the properties and testing of synthetic polypropylene fiber reinforced concrete (FRC). A standard test method for obtaining average residual strength of FRC was used to evaluate the performance of various concrete mixtures reinforced with synthetic …
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Characterization of Sulfonated Perfluorocyclobutane /Poly(Vinylidene Difluoride)-co-Hexafluoropropylene (PFCB/PVDF-HFP) Blends for Use as Proton Exchange Membranes
… wt:wt) blend fuel cell membrane including the constitutive and morphological properties, how these properties predict the stresses incurred under fuel cell operating conditions, and how these properties change over time under fuel cell operating conditions. Characterization was performed to …
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Experimental Studies on the Mechanical Durability of Proton Exchange Membranes
… testing methods are proposed to characterize properties of fuel cell materials that affect the mechanical durability of proton exchange membranes (PEMs). The first two methods involved measuring the in-plane biaxial strength of PEMs and the biaxial hygrothermal stresses that occur in PEMs …
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A new class of auxetic lattices
… we have determined analytically the macroscopic constitutive properties of these structures. The dependence of the effective properties on the constitutive and geometrical parameters of the micro-structure is given and a comparative analysis with hexagonal, triangular and square honeycombs is …
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Hybrid Carbon Fiber/ZnO Nanowires Polymeric Composite for Stuctural and Energy Harvesting Applications
… NWs functionally-graded the composite material properties and ensured effective load transfer across the interface. To assess the influence of the ZnO NWs growth, reference samples were also prepared by exposing the carbon fabric to the hydrothermal conditions. The damping properties of the …
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