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.
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Showing 1 to 20 of 43 for “"progressive damage"”.
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Probabilistic aspects of progressive damage in composite structures
… probabilistic aspects of the progression of damage in the analysis of composite structures are assessed. Two specific cases of graphite/epoxy with centrally-located holes are considered: a [0/90/±45], laminate subjected to equal biaxial tension, and a [±15/0],, laminate subjected to uniaxial …
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Monitoring Progressive Damage Development in Laminated Fiber Reinforced Composite Materials
… of growing importance in engineering practice. Damage development in composite materials is more complex than for metallic materials, because in composite materials (a) multiple damage modes are simultaneously in play, and (b) individual 'damage events' that occur throughout a component's …
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Progressive damage analysis for aerospace composite structures subjected to impact loads
L'abstract è presente nell'allegato / the abstract is in the attachment
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Charactarization [sic] and progressive damage analysis of quasi-three-dimensional composites
Thesis (Ph. D.)--Michigan State University. Dept. of Mechanical Engineering, 2010
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Refined structural modeling for progressive damage and fatigue analysis of composite structures
L'abstract è presente nell'allegato / the abstract is in the attachment
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Multi-Class 3D Segmentation of Progressive Damage in Advanced Composites using Deep Learning
… anisotropy are also associated with complex damage mechanisms that make failure prediction highly challenging, limiting CFRP performance knowledge and more efficient utilization. Typical damage mechanisms contributing to progressive failure fall into three categories, each of them manifesting …
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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 …
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Hierarchical material models with microstructure for nonlinear analysis of progressive damage in laminated composite structures
… 3D micromechanical models for the analysis of progressive damage in laminated structures. Each approach is generally a synthesis of three components: a nonlinear material model for the matrix behavior; a micromodel for the unidirectional lamina; and a sublaminate model for a repeating ply …
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X-ray Micro-Computed Tomography and Deep Learning Segmentation of Progressive Damage in Hierarchical Nanoengineered Carbon Fiber Composites
… anisotropy concomitantly give rise to complex damage mechanisms that lead to difficult-to-predict failure, limiting CFRP understanding. Progressive damage mechanisms in CFRPs generally encompasses a spectrum of modalities, interactions, and sequences across multiple scales, exhibiting broad …
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Progressive damage and failure of unidirectional fiber reinforced laminates under impact loading with composite properties derived from a micro-mechanics approach
… and linear elastically. We have analyzed damage initiation, damage progression, and failure of 16-ply unidirectional fiber reinforced laminates impacted at normal incidence by a rigid sphere. The damage is assumed to initiate when at least one of Hashin's failure criteria is satisfied with …
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Towards Multiclass Damage Detection and Localization using Limited Vibration Measurements
Traditional vibration-based damage detection methods provide structural health information based on their measured data (i.e., acceleration and displacement response). Over the last few decades, various model-based and time-frequency methods have shown great promises for damage identification and …
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Simulation of low-velocity impact damage in sandwich composites
… is their high susceptibility to impact-induced damage, which may result in significant strength reduction or even structural collapse. A detailed understanding of the extent and nature of impact damage is thus greatly needed for damage tolerance based structural design and a reliable estimation …
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A Predictive Methodology for Soft Impact Damage in Jet Engines Incorporating Hybrid Composite Structures
… capturing the full range of multifaceted damage in hybrid and composite structures as they evolve throughout the forward section of a propulsion system. Effective strategies are developed within an explicit finite element framework for modeling a bird, an engine forward section, intra-ply …
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Early Outgrowth Cells As A Novel Therapy for Chronic Kidney Disease
… these inter-connected processes lead to progressive damage and subsequent organ dysfunction. Current clinical therapies, consisting of aggressive blood pressure control and blockade of the renin-angiotensin system, fail to arrest this progressive injury in a significant number of …
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Identification of altered Ras signaling and intermediate filament hyperphosphorylation in giant axonal neuropathy
… (GAN) is a rare genetic disease that causes progressive damage to the nervous system. Neurons in GAN patients develop an abnormal organization of cytoskeletal proteins called intermediate filaments (IFs), which normally provide strength and support for the overall cell structure. The …
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Mechanical and microstructural characterization of nuclear grade PCEA graphite
… pore collapse, crack closure, shear banding, and progressive damage accumulation. Microstructural observations using SEM identified the heterogeneous filler–binder–pore network characteristic of PCEA graphite and linked fracture behavior to mechanisms such as crack deflection, branching, and …
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Coupled deformation-diffusion-fracture theories for solids : application to polymeric gels and hydrogen embrittlement in steels
… of fully-coupled deformation-diffusion-damage theories for two different classes of materials: (i) polymeric gels and (ii) hydrogen embrittlement in steels, as elaborated below. (i) Fracture of polymeric gels: We first introduce a field called "stretch of Kuhn segments and/or …
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Development and Validation of Fluid-Structure Interaction in Aircraft Crashworthiness Studies
… are only capable of a limited assessment of progressive damage and all crash configurations and scenarios cannot be physically evaluated. Advancements in technology have led to accurate and effective developments in numerical modeling that have the possibility of replacing these rigorous …
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Structural Design Inspired by the Multiscale Mechanics of the Lightweight and Energy Absorbent Cuttlebone
… cellular ceramics with high stiffness and damage tolerance. Cuttlebone is highly porous (porosity ~93%) and lightweight (density less than 20% of seawater), constructed mainly by brittle aragonite (95 wt%), but capable of sustaining hydrostatic water pressures over 20 atmospheres and …
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Investigation of strain rate sensitivity of polymer matrix composites
… The model also accounts for the effects of damage, the linear and non-linear viscoelastic constitutive laws reporting failure by instantaneously reducing the relevant elastic modulus to zero. An explicit solver is therefore utilised in order to ensure stability of the numerical procedure. …
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