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Showing 1 to 20 of 58 for “"damage evolution"”.
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Avalanches, percolation, and stochastic damage evolution in disordered media
… of significant amount of distributed damage which results in precursory events observed as avalanches in experiments and simulations. We use a jump Markov process to model the stochastic evolution of damage. The Markov process is informed by the avalanche size distribution for a given …
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Modeling Damage Evolution and Damage Healing using Data Driven Method
<p>Advanced aircraft use composite materials in over 50% of their airframe structures. Defects in composite materials frequently arise during manufacturing and processing phases, greatly affecting structural integrity and reliability. The intrinsic self-healing polymers are smart materials that …
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One Dimensional Approach to Modeling Damage Evolution in Galvanic Corrosion
… mathematical model is developed to describe damage evolution in galvanic corrosion for a variety of geometries. An asymptotic procedure taking advantage of disparity in length scales is used to derive the model. The focus of this thesis is to detail the formulation and solution of the 1D …
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Creep Damage Evolution in 316L Stainless Steel: Correlating Cavitation with Acoustic Emission
… is particularly focused on the progression of damage within the diffuse necking region, an antecedent to catastrophic rupture. A comprehensive post-mortem microstructural analysis, utilizing the precision of scanning electron microscopy (SEM), was conducted to thoroughly evaluate the morphology …
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Stress and creep damage evolution in materials for ultra-supercritical power plants
… (such as residual stress, constraint and creep damage associated with relaxation of residual stresses during PWHT) were then systematically examined. It was found that the geometric constraint (introducing a triaxial stress state) was beneficial in improving creep rupture life and that residual …
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Experimental investigation of damage evolution during strain burst in brittle rocks for deep mines
… of strain burst and the influence of thermal damage, high confining pressure and various loading rate on the overall mechanical behaviour of highly brittle granitic rocks leading to strain burst. Strain burst is related to the elastic stored strain energy and how this stored energy is released …
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Characterizing Damage Evolution and Yield in Sandstone Under Triaxial Loading as a Function of Various Effective Pressure
… Yielding and accumulation of microscopic damage at sub-critical stress levels however also are important characteristic of the failure process. Here, load-reload triaxial compression tests are used to investigate damage development at low and high effective pressures, and validate …
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A DEM for visualising damage evolution and predicting failure of composite lamina under uniaxial and biaxial loads
… in use of these materials is the complexity of damages that are taken place in different scale lengths starting from micro-scale level. With the development of computer power, however, the door is opened to enhance concepts such as a multi-scale analysis that can bridge microscale to …
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Impact of cellular dislocation structures produced by additive manufacturing on neutron irradiation damage evolution in stainless steel 316L
… their potential impact on irradiation-induced damage mechanisms must be studied. Stainless steel 316L (SS-316L) samples were irradiated in the Advanced Test Reactor overa range of fast neutron fluences as part of a grant received by the Colorado School of Mines. Characterization of the samples …
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Plant Defensive Traits: Translation of Their Effects on Herbivorous Insects Into Reduced Plant Damage (Evolution, Feeding Compensation, Predation)
… can be translated into reduced herbivore damage to the plant expressing the trait. Some of the more important constraints on the manifestation of those mechanisms are identified, and the probable relative importance of these constraints is discussed. It is argued that the reduction of …
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Microstrain Partitioning, TRIP Kinetics and Damage Evolution in Third Generation Dual Phase and TRIP-Assisted Advanced High Strength Steels
… but are also compromised by their poor damage tolerance. Hence, considerable reports are available regarding the damage tolerance of DP steels, but the ability for the volume expansion associated with the austenite-to-martensite transformation to suppress damage evolution and enhance a …
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Ballistic Impact Simulations using the new Unified Mechanics Theory
… any curve fitting techniques to calculate the damage evolution. Entropy production alone is used as a metric for damage evolution for elastic and inelastic deformations. This theory can be used for any type of material and for a wide range of damage problems. In this study, an A36 Steel plate …
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MULTI-SCALE MECHANICS OF COMPOSITE SANDWICH STRUCTURES WITH BIOLOGICALLY INSPIRED FIBER REINFORCED FOAM CORES: A POTENTIAL TEMPLATE FOR DEVELOPING MULTIFUNCTIONAL STRUCTURES
… and strain rate on macroscale response and damage evolution has been evaluated through experiments. It is seen that increase in macrofiber concentration increases the stiffness of the Palmetto wood, leading to a higher concentration of macrofiber in the outer region of the wood by evolution. …
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Analytical and experimental investigation of microstructural alterations in bearing steel in rolling contact fatigue
… and propagation from inclusions. A new damage evolution equation coupled with a FE model is employed to account for the effect of mean stresses and alternating stresses simultaneously to investigate butterfly formation. The proposed damage evolution law matches experimentally observed …
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Experimental and Numerical Analysis of Damage in Notched Composites
… in order to investigate the effect of fatigue damage development on the residual properties. Quasi-static tests were initially performed on notched composites using digital image correlation (DIC) to determine the strain profiles at selected transverse sections of the outer ply of the laminates …
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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. …
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Design of Improved Ceramic/polymeric Composites
… These different failure modes led to a damage evolution study via thermoelastic stress analysis.
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Numerical Modelling of Steel Fibre Reinforced Concrete Subjected to Fatigue Loading
… offering increased resistance to fatigue damage. Despite extensive experimental research on SFRC, the fatigue behaviour of pre-cracked SFRC remains insufficiently explored, particularly from a numerical modelling perspective. This study investigates the monotonic behaviour and fatigue …
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Fatigue stiffness loss and life prediction technique development of a real rubber automotive component by means of Finite Element Analysis
… of cracks, but including stiffness loss and damage evolution. It has been performed in two filled rubbers, one natural rubber and one blend of StyreneButadiene (SBR) with polibutadiene (BR). Such techniques involve various topics to be analyzed: material mono tonic and cyclic deformation …
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