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 20 of 47 for “"Multi-axial"”.
-
Development of a multi-axial load distribution measurement device
… The aim of this study was to develop a low-cost multi-axial load transducer array to measure the distribution of stress beneath the human foot during walking. A preexisting piezoelectric-based load transducer and several novel transducer designs using hydraulic, optoelectronic and magnetic-based …
-
Multi-axial Active Isolation for Seismic Protection of Buildings
… excitations. Earthquakes are intrinsically multi-dimensional, resulting in out-of-plane responses, including torsional responses. Therefore, an active isolation system for buildings using multi-axial active control devices against multi-directional excitations must be considered. The focus …
-
Multi-axial failure of high-performance fiber during transverse impact
<p>The effect of projectile nose geometry on ensuing wave development in high-performance yarns is explored during single yarn transverse impact. Special attention has been placed on visualizing the immediate region around the projectile-yarn contact site for 0.30-cal round, 0.30-cal fragment …
-
Development of Multi-Axial Fatigue Retrofits for Lock Gate Components
… because of this. These stresses are known to be multi-axial stresses which cause multi-mode cracking at the crack tips of the developed fatigue cracks. </p> <p>The thesis herein presents an analytical and experimental investigation into multi-axial fatigue crack mitigation by the use of carbon …
-
Multi-axial fracture behaviour of notched carbon-fibre/epoxy laminates
… and are also often subjected to complex combined multi-axial stress conditions during service. Yet their notched multi-axial fracture behaviour remains largely unexplored. This is the main contribution of the thesis. First, a novel loading fixture for applying a wide range of in-plane loading …
-
Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
Previous investigations into fatigue under multiaxial stress, and also cumulative damage under uniaxial stress, are discussed in conjunction with the parameters relevant to the present experimental investigation. A biaxial fatigue machine is described which can subject thin wall tubes to …
-
Development and implementation of a multi-axial real-time hybrid simulation framework
… the response of structural components with multi-axial loading, a loading assembly with multiple parallel actuators connected to a rigid moving platform is required to impose realistic boundary conditions on physical components. This loading assembly is expected to exhibit significant …
-
Stress Response of Tall and Heavy Electronic Components Subjected to Multi-axial Vibration
Electronic assemblies often experience multiaxial vibration environments in use and tall, heavy components are more vulnerable when exposed to multiaxial vibration than are shorter, lighter assemblies. The added vulnerability comes from higher stresses that are a result of nonlinear dynamic …
-
Multi-axial real-time hybrid simulation framework for testing nonlinear structure systems with multiple boundary interfaces
… therefore, an actuation system that can apply multi-axial loads is required. In these experiments, the boundary conditions at the interface between the physical and numerical substructures are imposed by two or more actuators. Significant dynamic coupling can be present between the actuators in …
-
Multi-axial strain monitoring of fibre reinforced thermosetting plastics using embedded highly birefringent optical fibre Bragg sensors
… necessitates the possibility of measuring multi-axials strain fields. High birefringent optical fibres (HiBi-fibres) with Bragg grating can become a solution in this matter. Designing a multi-axial strain sensor based on optical FBGs should meet several basic requirements which are …
-
Hybrid experimental-numerical determination of the loading path to fracture in TRIP780 sheets subjected to multi-axial loading
… strain histories up to the onset of fracture in multi-axial experiments. In the present work, a hybrid experimental-numerical approach is taken to determine the loading path in various fracture experiments on TRIP780 steel sheets. In most mechanical experiments on sheet metal, the localization of …
-
Anisotropic ductile fracture of metal sheets : experimental investigation and constitutive modeling
… plastic deformation and ductile fracture under multi-axial loading is highly relevant to various industrial applications such as metal forming, impact failure of structures, etc. In this thesis, a comprehensive study of the plasticity and ductile fracture of anisotropic metal sheets is …
-
Rate-Dependent Behavior of Clay
… the mechanical response of clays under multi-axial loading conditions and predicts both drained and undrained behaviors at small and large strains. Model parameter values are determined for Boston Blue Clay, London Clay and Kaolin Clay. The performance of the model in simulating the …
-
Determining the Influence of Experimental Setup and Inputs on Nonlinear Systems
… experiences dynamic loading. The complex, multi-axial loads and surrounding system are the environmental conditions. Due to the lack of understanding of nonlinear system dynamics, the components and structures have been over-designed to handle these environmental conditions and reduce …
-
Ductile fracture at intermediate stress triaxialities : experimental investigations and micro-mechanical modeling
… of the onset of fracture. Based on an extensive multi-axial experimental program, the anisotropic plasticity of the present material is described by a non-associated quadratic anisotropic model. Comparison of model predictions to experimental results reveals that the proposed model provides …
-
Development of domain integral and generalized finite element methods for three dimensional analysis of near-surface cracking in flexible pavements
… nonuniform tire-pavement contact stresses and multi-axial stress states in the proximity of tires. This study highlights the impact of novel computational methods, such as the Generalized Finite Element Method (GFEM), on the discovery and understanding of cracking mechanisms in pavements. GFEM …
-
Multiscale Computational Framework for Analysis and Design of Ultra-High Performance Concrete Structural Components and Systems
… response, and extends a structural-level triaxial continuum constitutive law to account for the addition of discrete fibers. The approach is robust, general, and could be utilized by other researchers to expand the computational capability and simulate the behavior of different composite …
-
Finite element modelling the forming of components for portable electronic devices
… of a custom rig chosen to replicate the multi-axial state of stress induced associate with the forming process, initial load controlled bulge testing experiments revealed non-linear strain paths in principal directions yielding average and maximum strain rate ranges of 2.5–5 s-1 and 5–18 …
-
Measuring and Modeling the Time-Dependent Response of Cementitious Materials to Internal Stresses
… models. Measured viscoelastic properties from multi-axial compression were not in full agreement with results from uniaxial compression, which provides some insight into the mechanisms of time-dependent behavior of cementitious materials.
Page 1 of 3