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 86 for “"damage model"”.
-
An anisotropic damage model for rock
An anisotropic damage model is proposed for the constitutive description of microcracking processes in brittle rock under a general loading path. Experimental data and micromechanical models are reviewed to quantify the effect of microcracking on the material stiffness and the mechanisms of …
-
Multiaxial fatigue damage model for random amplitude loading histories
… approach yet exists. A multiaxial fatigue damage model developed for approximately proportional random amplitude loading is proposed in this study. A normal strain based analysis incorporating the multiaxial state of stress is conducted along a critical orientation assuming a constant …
-
Nonlinear analysis of laminated composite shells using a micromechanics-based progressive damage model
A micromechanics-based model for progressive failure analysis of laminated composite shell structures has been developed and implemented. The model couples a finite element model for nonlinear analysis of laminated shells with a micro mechanics elasticity solution for predicting failure and …
-
Towards a material damage model using the logarithmic strain, with von Mises plasticity considerations
Damage is briefly defined as the presence and growth of micro-defects in a material. This study serves to describe the computational implementation of the material damage theory adopted for ductile materials. Thus, pays attention to the computational analysis of the physical behaviour of materials …
-
MODELLING AND SIMULATION MICROMACHINING OF THE ADDITIVELY MANUFACTURED METAL PARTS
… thesis aims to identify the dynamic material and damage model constants for additively manufactured stainless steel 316L and develop models and simulations to study and predict the micro machining process of selective laser melted (SLMed) stainless steel 316L. The influence of heat treatment …
-
A study of localized failure modes in brittle materials
… studies arise from the need to accurately model the behaviour of materials which exhibit instabilities due to strain softening or geometric effects. Localization in finite element modelling of brittle materials such as concrete and rock is a relatively unexplored area in computational …
-
Finite element damage modeling of plain weave fabrics
… such composites. In this work, the geometrical model needed for finite element discretization of the plain weave fabrics are developed for three configurations---single lamina, iso-phase, and out-of-phase. Next, a procedure to determine the longitudinal elastic modulus under tensile loading is …
-
Simulation of Fracture of Concrete Using Micropolar Peridynamics
… goal of the thesis is to develop a constitutive damage model for simulating tensile fracture of concrete using the micropolar peridynamics model. Micropolar peridynamics was proposed by Gerstle in 2007 as a generalization to the bond based peridynamics method introduced by Silling in 2000, which …
-
Development of a SWMM-GIS Flood Model for New Orleans Drainage Pumping Station No 4 Basin
An urban flood damage model for the drainage area serve by Pump Station No. 4 (Prentiss, New Orleans, Louisiana) has been completed. This study presents the research effort needed to develop a stormwater management model (SWMM) integrated with GIS that includes a Damage Model to estimate the losses …
-
Numerical simulation of fragmentation and spalling and parallelization of a spacetime finite element code
… Method (SDGFEM) coupled with an interfacial damage model. SDGFEM offers many advantages over conventional finite element methods. These include element-wise conservation, linear computational complexity, powerful dynamic adaptive meshing, interface tracking, preservation of characteristic …
-
Constitutive modelling and finite element analysis in geomechanics
… thesis was the development of a constitutive model for hard rock at high pressure. The model should capture the important features of material behaviour and should be soundly based on mechanical principles; furthermore it should be simple enough to permit implementation and use in large …
-
Seismic Damage Analysis and Design of Unreinforced Masonry Buildings
A model for evaluating the structural damage to masonry buildings subjected to earthquake ground motion is proposed. Damage is expressed as a combination of the effects of excessive deformation and repeated loadings. Model parameters for unreinforced brick masonry were obtained from cyclic load …
-
Permanent deformation behavior of unbound granular materials and rutting model development
The rutting damage model as incorporated into the AASHTO’s mechanistic-empirical (M-E) pavement design approaches (i.e. Pavement ME Design) was found to produce inadequate rut estimates in unbound aggregate base/subbase layers by discounting the contribution of stress state from the original Tseng …
-
Finite element analysis and experimental validation of reinforced concrete single-mat slabs subjected to blast loads
… is used for this study. The finite element models of these 12 slab panels are developed in LS-DYNA® and blast pressures equivalent to those generated in the experiment are applied to them. These slabs include two material combinations based on their strength namely, the high-strength …
-
Coupled Gradient Enhanced Damage - Viscoplasticity Model Using Phase Field Method
… is developing a framework to describe damage evolution as a phase transformation in solid materials and couple it to the well-known Perzyna type viscoplastic model to account for inelastic behavior of ductile materials. To accomplish this task, the following steps have been performed. …
-
Tensile Fatigue Damage and Degradation of Random Short-Fiber Smc Composite
Fatigue damage and degradation in a random short-fiber SMC-R50 composite are investigated experimentally and theoretically. In the study of homogeneous damage, experiments were conducted to examine fundamental mechanisms and characteristics of fatigue damage and its evolution. The statistical …
-
Risk Assessment and Optimal Response Strategies for Resilience of Electric Power Infrastructure to Extreme Weather
… systems. This thesis develops a stochastic modeling and decision-making framework for proactive resource allocation and response strategies to improve the resilience of electric power infrastructure in the wake of severe weather events. The framework is based on a physically-based, …
-
Contact stress analysis and fatigue life prediction for a cam-roller follower system
… amplitude and mean which are used with a fatigue damage model to predict fatigue crack initiation. Results, pending experimental confirmation, appear reasonable and provide a useful basis for optimizing cam performance in terms of manufacturing and design parameters.
-
The Physiological and Morphological Responses of the Bladder Urothelium to Differential Injury
… pain response in mice we used a UTI injury model from instillation of uropathogenic E. coli: UPEC), a cellular damage model from single dose protamine sulfate: SDPS) instillation, and an inflammatory damage model from multiple instillations of lipopolysaccharide: LPS). We identified that …
Page 1 of 5