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Дисертації з теми "Crack damage"

Автор: Grafiati

Опубліковано: 7 червня 2025

Оновлено: 2 серпня 2025

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1

俞立剛 and Ligang Yu. "Orthotropic damage models for fatigue crack initiation andpropagation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31233995.

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2

Gualandi, Gabriele. "Crack modeling and crack propagation in structures using damage model and extended finite element techniques." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3931/.

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3

Yu, Ligang. "Orthotropic damage models for fatigue crack initiation and propagation /." [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13570377.

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4

Zohora, Fatematuz. "Evaluation of material crack using acoustic emission technique." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/94663/1/Fatematuz_Zohora_Thesis.pdf.

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Анотація:

Cracks in civil structures can result in premature failure due to material degradation and can result in both financial loss and environmental consequences. This thesis reports an effective technique using Acoustic Emission (AE) technique to assess the severity of the crack propagation in steel structures. The outcome of this work confirms that combination of AE parametric analysis and signal processing techniques can be used to evaluate crack propagation under different loading configurations. The technique has potential application to assess and monitor the condition of civil structures.

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5

Hafezi, M. H., R. Alebrahim, and T. Kundu. "Crack propagation modeling using Peridynamic theory." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622515.

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Crack propagation and branching are modeled using nonlocal peridynamic theory. One major advantage of this nonlocal theory based analysis tool is the unifying approach towards material behavior modeling- irrespective of whether the crack is formed in the material or not. No separate damage law is needed for crack initiation and propagation. This theory overcomes the weaknesses of existing continuum mechanics based numerical tools (e.g. FEM, XFEM etc.) for identifying fracture modes and does not require any simplifying assumptions. Cracks grow autonomously and not necessarily along a prescribed

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6

Li, Shi. "Modeling of active crack damage control and the active fatique damage control of adhesive joint." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08222009-040330/.

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7

FERREIRA, SAMUEL ELIAS. "FATIGUE CRACK PROPAGATION MODELLING BY ACCUMULATED DAMAGE INSIDE PLASTIC ZONE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35852@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Após identificar que uma trinca de fadiga permanecia fechada durante parte do ciclo, Elber assumiu que o dano era induzido apenas pela fração do carregamento acima da carga necessária para abrir a trinca. Diversos modelos foram propostos utilizando o Delta Keff como força motriz da propagação, como os modelos da faixa plástica (strip-yield), que são amplamente utilizados para prever vida residual de componentes trincados. Embora o fenômeno do fechamento da trinca esteja provado, sua real importância na propagação da trinca de fadiga ainda é

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8

Aydogan, Mustafa Ozgur. "Damage Detection In Structures Using Vibration Measurements." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1058809/index.pdf.

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Cracks often exist in structural members that are exposed to repeated loading, which will certainly lower the structural integrity. A crack on a structural member introduces a local flexibility which is a function of the crack depth and location. This may cause nonlinear dynamic response of the structure. In this thesis, a new method is suggested to detect and locate a crack in a structural component. The method is based on the fact that nonlinear response of a structure with a crack will be a function of the crack location and crack magnitude. The method suggested is the extension of a recent

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9

Pape, John Andrew. "Fretting fatigue damage accumulation and crack nucleation in high strength steels." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/18382.

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10

Schmidt, Walter Thomas Conlon Stephen C. Smith Edward C. "Open-crack damage assessments of aluminum panels using structural intensity-based techniques." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4237/index.html.

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11

Hamad, Waleed Ibrahim. "Flexural crack modelling for vibration-based damage detection of reinforced concrete beams." Thesis, University of Nottingham, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604573.

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The use of changes in vibration propelties for damage detection of civil infrastructure has been a subject of investigation for many years. However, the implementation of vibration-based techniques in reinforced concrete structures is extremely limited, due principally to the absence of suitable crack models. The aim of this research is to determine whether a flexural crack model incorporating non-linearity is able to quantitatively reproduce changes in vibration characteristics of cracked reinforced concrete beams, and to assess the sensitivity of changes in vibration properties to realistic

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12

Chen, Xin. "Load-enhanced lamb wave methods for the in situ detection, localization and characterization of damage." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54859.

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A load-enhanced methodology has been proposed to enable the in situ detection, localization, and characterization of damage in metallic plate-like structures using Lamb waves. A baseline-free load-differential method using the delay-and-sum imaging algorithm is proposed for defect detection and localization. The term “load-differential” refers to the comparison of recorded ultrasonic signals at various levels of stress. Defect characterization is achieved by incorporating expected scattering information of guided waves interacting with defects into the minimum variance imaging algorithm, and a

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13

Xu, Yigeng. "Closure assessment and overload transient behaviour in damage tolerant airframe materials." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390752.

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14

Spanrad, Sven Klaus. "Fatigue crack growth in laser shock peened aerofoils subjected to foreign object damage." Thesis, University of Portsmouth, 2011. https://researchportal.port.ac.uk/portal/en/theses/fatigue-crack-growth-in-laser-shock-peened-aerofoils-subjected-to-foreign-object-damage(b367cb9f-b746-4c27-9479-49cd48999519).html.

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Foreign Object Damage (FOD) is one of the main life limiting factors for aeroengine fan blades. The FOD impacts during takeoff and landing cause severe damage to aerofoils, resulting in reduced air safety and life time with an estimated annual cost of $4 billion for the aeroengine industry. Advanced surface treatments, such as Laser Shock Peening (LSP) have significantly improved the fatigue strength and crack growth resistance of critical components under FOD. However, it is not yet possible to predict the protective residual stresses and utilise their full potential for enhancing fatigue res

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15

Li, Xiaole. "An extended cohesive damage model for simulating crack propagation in fibre reinforced composies." Thesis, University of Portsmouth, 2016. https://researchportal.port.ac.uk/portal/en/theses/an-extended-cohesive-damage-model-for-simulating-crack-propagation-in-fibre-reinforced-composies(c8a15f4e-826e-444a-9c8a-758b75f8c742).html.

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This thesis presents an extended cohesive damage model (ECDM) for simulating crack propagation in fibre reinforced composites. By embedding the cohesive zone model (CZM) into the eXtended Finite Element Method (XFEM)and eliminating the enriched degree of freedoms (DoFs), the ECDM defines the cohesive crack path in an implicit way in equilibrium equations and enables the local enrichments of approximation spaces without additional DoFs. The contribution from additional DoFs can be accounted via the DoFs elimination,which allows discontinuities to exist within a finite element rather than the el

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16

Ma, Leong. "Crack link up and residual strength of aircraft structure containing multiple site damage /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/7039.

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17

Connaughton, M. D. "A study of cumulative fatigue and creep-fatigue damage in Type 316 steel." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234153.

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18

Patel, Ronak. "CORROSION DAMAGE STUDIES THROUGH MICROSCOPY AND STRESS ANALYSIS." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/1620.

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Анотація:

Corrosion is the destructive result of chemical reaction between a metal or metal alloy and its environment. Airplanes, power generating plants, chemical process and manufacturing plants, concrete structure, and many others which widely uses aluminum alloy and stainless steel alloys are subjected to corrosion. The estimated cost of corrosion damage is in order of 3 to 5 percent of gross national product (GNP). Out of all forms of corrosion, pitting corrosion is most commonly observed in aluminum alloy 2024 and stainless steel type 316. There is a need to study the stress environment around the

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19

Martin, Anthony Russell. "Impact damage detection in filament wound tubes using embedded optical fibre sensors." Thesis, Brunel University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266542.

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20

Dharmawan, Ferry, and ferry dharmawan@rmit edu au. "The Structural Integrity And Damage Tolerance Of Composite T-Joints in Naval Vessels." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081216.163144.

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In this thesis, the application of composite materials for marine structures and specifically naval vessels has been explored by investigating its damage criticality. The use of composite materials for Mine Counter Measure Vessels (MCMVs) was desirable, especially for producing material characteristics, such as light weight, corrosion resistance, design flexibility due to its anisotropic nature and most importantly stealth capability. The T-Joint structure, as the primary connection between the hull and bulkhead forms the focus of this research. The aim of the research was to determine the met

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21

Asnaashari, Erfan. "Vibration-based damage detection in structures." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/vibrationbased-damage-detection-in-structures(09061582-55fb-4fba-846e-2156dd4ef172).html.

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Structural health monitoring systems have a great potential for cost saving and safety improvement in different types of structures. One of the most important tasks of these systems is to identify damage at an early stage of its development. A variety of methods may be used to identify, locate, or quantify the extent of damage or fault in a structural or mechanical component. However, the preferable method is the one which maximises the probability of detecting the flaw, while also considering feasibility of in-situ testing, ease of use and economic factors. Cracks are one of the common defect

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22

Fatoba, Olusegun Oludare. "Experimental and modelling studies of corrosion fatigue damage in a linepipe steel." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-modelling-studies-of-corrosion-fatigue-damage-in-a-linepipe-steel(075ec5a1-f7a1-4b1c-b5d7-99ff3472d21d).html.

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The work is concerned with the development of a multi-stage corrosion fatigue lifetime model, with emphasis on pitting as a precursor to cracking. The model is based upon the quantitative evaluation of damage during the overall corrosion fatigue process. The fatigue response of as-received API 5L X65 linepipe steel has been investigated in terms of the evolution of damage during pit development, pit-to-crack transition and crack propagation. Micro-potentiostatic polarisation was conducted to evaluate role of stress on pit development. Crack growth rate measurements were conducted on pre-pitted

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23

Schallhorn, Charles Joseph. "Coherence-based transmissibility as a damage indicator for highway bridges." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/2007.

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Vibration-based damage detection methods are used in structural applications to identify the global dynamic response of the system. The purpose of the work presented is to exhibit a vibration-based damage detection algorithm that calculates a damage indicator, based on limited frequency bands of the transmissibility function that have high coherence, as a metric for changes in the dynamic integrity of the structure. The methodology was tested using numerical simulation, laboratory experimentation, a

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24

Pelà, Luca. "Continuum damage model for nonlinear analysis of masonry structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/30327.

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The present work focuses on the formulation of a Continuum Damage Mechanics model for nonlinear analysis of masonry structural elements. The material is studied at the macro-level, i.e. it is modelled as a homogeneous orthotropic continuum. The orthotropic behaviour is simulated by means of an original methodology, which is based on nonlinear damage constitutive laws and on the concept of mapped tensors from the anisotropic real space to the isotropic fictitious one. It is based on establishing a one-to-one mapping relationship between the behaviour of an anisotropic real material and that of

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25

Norris, Richard H. "Transients and resulting damage conditions during elevated temperature crack growth in an antimony copper alloy." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19561.

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26

Zhou, Haoliang. "A continuum damage approach for predicting creep crack growth failures in components containing residual stresses." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25761.

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Анотація:

Components in advanced gas cooled reactor (AGR) operating at elevated temperatures in the range of 500-650°C are typically susceptible to the initiation and growth of cracks due to creep. Type 316H stainless steel steam headers after a long term service are susceptible to reheat cracking in the vicinity of the weld driven by the presence of welding residual stresses. For this reason, this research has focused on developing pragmatic numerical methods for predicting creep crack growth behaviour of welded components containing residual stresses, using a simplified continuum damage and fracture m

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27

Ondrouch, Dušan. "Analýza poškození čelních skel automobilů a možnosti jejich opravy." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318271.

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Theoretical part’s opening describes brief history of manufacturing of windshields and glass in general. Further in this part, key parameters and additional features are described as well as manufacturing processes of a modern windshield. Moreover, homologation procedure is clarified. The main focus of this thesis is technical description of typical damage of car’s windshield and investigation of its root causes, which may help to reveal insurance fraud. The thesis also outlines alternative way, which can be used to recover damaged windshield or, if necessary, to replace it.

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28

Scheutz, Jon. "Examination of defects and long term crack growth in rolled bars during long term storage." Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148106.

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This work has had the purpose to examine defects and the cause of crack growth during long term storage in rolled bars. The bars in question are rolled and stored at Ovako in Hofors. The problem is approached by theoretically examining the possibilities of hydrogen damage, room temperature creep and naturally occurring porosity. Seven bars of three steel type groups and with different rolling dates were selected and examined for defects with ultrasonic testing. Four of the bars show defects. Specimens containing the defects are cut out and grinded so that the defects can be examined in the sca

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29

Freitas, Thiago Aley Brites de. "Avaliação dos índices de DNA danificado em usuários de crack." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/67521.

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O crack é um subproduto da cocaína obtido a partir da pasta de coca acrescida do bicarbonato de sódio, sendo comercializado na forma de pequenas pedras porosas. No Brasil, o consumo de crack tem sido alvo de grande preocupação devido sua expressiva expansão em várias regiões, sendo que o aumento da prevalência do seu consumo vem sendo amplamente documentado nos últimos anos. A dependência de crack é a causa mais prevalente de internação por uso de cocaína. Há uma necessidade imediata de estudos que se direcionem para esta população. A presente pesquisa pretende demonstrar evidências capazes de

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30

Jrad, Mohamed. "Multidisciplinary Optimization and Damage Tolerance of Stiffened Structures." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/52276.

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The structural optimization of a cantilever aircraft wing with curvilinear spars and ribs and stiffeners is described. The design concept of reinforcing the wing structure using curvilinear stiffening members has been explored due to the development of novel manufacturing technologies like electron-beam-free-form-fabrication (EBF3). For the optimization of a complex wing, a common strategy is to divide the optimization procedure into two subsystems: the global wing optimization which optimizes the geometry of spars, ribs and wing skins; and the local panel optimization which optimizes the desi

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31

Bohýl, Tomáš. "Hmotnostní optimalizace dolního integrálního panelu křídla velkého dopravního letounu dle předpisu CS-25." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442830.

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32

Rakovský, Kristián. "Metodika analýz Damage Tolerance letecké konstrukce s využitím programu AFGROW." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241714.

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Анотація:

Diplomová práce se zabývá návrhem metodiky výpočtu závislého šíření trhlin ve více konstrukčních částech s využitím programu AFGROW. Prezentována metodika, která také zahrnuje stanovení zbytkové pevnosti, byla aplikována v damage tolerance analýzách vybraných míst na konstrukci křídla L 410 NG.

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33

Newman, John Andrew. "The Effects of Load Ratio on Threshold Fatigue Crack Growth of Aluminum Alloys." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29418.

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The integrity of nearly all engineering structures are threatened by the presence of cracks. Structural failure occurs if a crack larger than a critical size exists. Although most well designed structures initially contain no critical cracks, subcritical cracks can grow to failure under fatigue loading, called fatigue crack growth (FCG). Because it is impossible or impractical to prevent subcritical crack growth in most applications, a damage tolerant design philosophy was developed for crack sensitive structures. Design engineers have taken advantage of the FCG threshold concept to design

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34

Godha, Anshul. "Microstructural effects on fatigue damage evolution in advanced high strength sheet (AHSS) steels." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53510.

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An understanding of the damage evolution prior to crack initiation in advanced structural materials is of vital importance to the fatigue community in both academia and industry. Features known as the Persistent Slip Bands (PSBs) play an integral role in this damage evolution. Therefore, PSBs have been the focus of a lot of science-based investigations over the years. However, most existing studies in this area are restricted to analysis of PSBs in single crystal face centered cubic (FCC) materials. Moreover, these studies lack a quantitative analysis of the evolution of the fatigue damage (or

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35

Josefsson, Axel, and Johan Wedin. "Convergence properties of a continuum damage mechanics model for fatigue of adhesive joints." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-10188.

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The effect of the element length is examined in modelling crack growth in fatigue loading of an adhesive joint. This is done for a cohesive element using an expression for the damage evolution developed at the University of Skövde which is implemented using the UMAT subroutine in the FE-solver Abaqus. These analyses are done for pure mode I loading by analysing a DCB-specimen loaded by a pure moment. An expression is developed in which the critical element length is dependent on the geometry of the specimen (in the form of the wave number of the adhesive joint), the element length, the materia

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36

Onifade, Ibrahim. "Development of Energy-based Damage and Plasticity Models for Asphalt Concrete Mixtures." Doctoral thesis, KTH, Byggnadsmaterial, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198663.

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Characterizing the full range of damage and plastic behaviour of asphalt mixtures under varying strain-rates and stress states is a complex and challenging task. One reason for this is partly due to the strain rate and temperature dependent nature of the material as well as the variation in the properties of the constituent materials that make up the composite asphalt mixture. Existing stress-based models for asphalt concrete materials are developed based on mechanics principles, but these models are, however, limited in their application for actual pavement analysis and design since rate dep

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37

Vaněk, David. "Analýzy damage tolerance s uvážením interakce zatěžovacích kmitů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254285.

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Master’s thesis deals with study of fatigue crack growth retardation models. This document presents description, evaluation, verification and finally application of retardation models demonstrated on the damage tolerant structure. Analysis was provided on the L 410 NG aircraft in the location of the rear spar lower flange joint. Output of this thesis is comparison of the damage tolerance analysis with the current method using in the Aircraft Industry a. s., i.e. linear model without using load interaction models. The comparisons are fatigue crack growth curves, threshold and intervals of inspe

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38

Neeli, Yeshwanth Sai. "Use of Photogrammetry Aided Damage Detection for Residual Strength Estimation of Corrosion Damaged Prestressed Concrete Bridge Girders." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99445.

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Corrosion damage reduces the load-carrying capacity of bridges which poses a threat to passenger safety. The objective of this research was to reduce the resources involved in conventional bridge inspections which are an important tool in the condition assessment of bridges and to help in determining if live load testing is necessary. This research proposes a framework to link semi-automated damage detection on prestressed concrete bridge girders with the estimation of their residual flexural capacity. The framework was implemented on four full-scale corrosion damaged girders from decommission

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39

Wang, Kaihong. "Vibration Analysis of Cracked Composite Bending-torsion Beams for Damage Diagnosis." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29891.

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An analytical model of cracked composite beams vibrating in coupled bending-torsion is developed. The beam is made of fiber-reinforced composite with fiber angles in each ply aligned in the same direction. The crack is assumed open. The local flexibility concept is implemented to model the open crack and the associated compliance matrix is derived. The crack introduces additional boundary conditions at the crack location and these effects in conjunction with those of material properties are investigated. Free vibration analysis of the cracked composite beam is presented. The results indicate t

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40

Karabela, Alkistis. "An experimental and computational study of damage and crack growth for a nickel-based superalloy under fatigue-oxidation conditions." Thesis, University of Portsmouth, 2011. https://researchportal.port.ac.uk/portal/en/theses/an-experimental-and-computational-study-of-damage-and-crack-growth-for-a-nickelbased-superalloy-under-fatigueoxidation-conditions(5c2951b6-04c4-45db-88ff-0790b2e1a7b8).html.

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Oxidation damage, in conjunction with fatigue, is a concern for nickel-based superalloys utilised as disc rotors in high pressure compressor and turbine of aero-engines. A combined experimental and numerical study has been carried out for alloy RR1000, developed at Rolls-Royce plc through a powder metallurgy route to meet the demands for higher overall pressure ratios, compressor discharge temperatures and rotational speeds for the latest aero-engines. Cyclic experiments have been carried out for waisted specimens at selected temperatures (700°C-800°C), followed by microscopy examination using

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41

Sadriji, Besnik. "Analysis and characterization of the damage phenomena occurring from handling and service surface anomalies." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST082.

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Ces travaux de thèse ont porté sur l'étude des phénomènes d'endommagement induits par l'introduction d'anomalies de surface de type choc ou rayure, lors d'opérations de maintenance des disques de turbine haute pression. D'une part, ces dernières créent une concentration de contraintes en fond d'anomalie liée au défaut géométrique, qui, couplée à la sévérité des chargements thermomécaniques subits par les disques, amène à l'amorçage et la propagation d'une fissure courte. D'autre part, ces anomalies s'accompagnent de déformations dans la matière qui induisent de l'écrouissage et des contraintes

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42

Shipsha, Andrey. "Failure of Sandwich Structures with Sub-Interface Damage." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3184.

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43

Orifici, Adrian Cirino, and adrian orifici@student rmit edu au. "Degradation Models for the Collapse Analysis of Composite Aerospace Structures." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080619.090039.

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Wang, Xiaofeng. "Computational technology for damage and failure analysis of quasi-brittle materials." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/computational-technology-for-damage-and-failure-analysis-of-quasibrittle-materials(a7c91eb6-5058-4e73-95de-b2f3efd645d2).html.

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The thesis presents the development and validation of novel computational technology for modelling and analysis of damage and failure in quasi-brittle materials. The technology is demonstrated mostly on concrete, which is the most widely used quasi-brittle material exhibiting non-linear behaviour. Original algorithms and procedures for generating two-dimensional (2D) and three-dimensional (3D) heterogeneous material samples are developed, in which the mesoscale features of concrete, such as shape, size, volume fraction and spatial distribution of inclusions and pores/voids are randomised. Firs

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45

Cattini, Nikita. "Dynamic modelling of crack damage at the interface of non-structural masonry walls and the structure due to earthquake motion." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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In the last few years, the north of the Netherland was hit by several earthquakes of light intensity due to the extraction of gas. In this regard some problems were encountered on old masonry structures built with local techniques (Terraced house). This thesis studies the problem of the crack opening of the interface between non-structural masonry wall and structural parts under a light earthquake with a 2D dynamic model. To study this problem a micro model for the interface and a macro model for the elements it is created. Where for the interface a particular constitutive law is studied: el

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Zabeen, Suraiya. "Fatigue crack growth in complex residual stress fields due to surface treatment and foreign object damage under simulated flight cycles." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/fatigue-crack-growth-in-complex-residual-stress-fields-due-to-surface-treatment-and-foreign-object-damage-under-simulated-flight-cycles(e1469ad3-1aaf-4d19-b9dd-f2b3a9c187d9).html.

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Foreign object damage (FOD) refers to the damage that generally takes place in aero engine fans and compressor blades, due to the ingestion of hard particles/debris during aeroplane take-off, taxiing, or landing. Such damage can reduce the fatigue life expectancy of the turbine engine components by 50%. Residual stresses and small microcracks induced by the high speed FOD impacts are two root causes that result in premature failure of these components. One way to mitigate the FOD related fatigue failure is to induce deep compressive residual stress into the surface. Among the available techniq

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47

Goksel, Lorens Sarim. "Fatigue and damage tolerance assessment of aircraft structure under uncertainty." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49124.

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This thesis presents a new modeling framework and application methodology for the study of aircraft structures. The framework provides a ‘cradle-to-grave’ approach to structural analysis of a component, where structural integrity encompasses all phases of its lifespan. The methodology examines the holistic structural design of aircraft components by integrating fatigue and damage tolerance methodologies. It accomplishes this by marrying the load inputs from a fatigue analysis for new design, into a risk analysis for an existing design. The risk analysis incorporates the variability found from

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Bezerra, Agnes. "The Use of Artificial Intelligence for Assessing Damage in Concrete Affected by Alkali-Silica Reaction (ASR)." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42730.

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Over the last decades, numerous techniques have been proposed worldwide to assess the actual damage of critical concrete infrastructure. A method that has progressively been used in North America is a novel microscopic tool, the Damage Rating Index (DRI). This semi-quantitative petrographic tool was developed to reliably appraise both the nature and degree of damage in concrete affected by alkali-silica reaction (ASR), which may threaten the serviceability and the durability of concrete infrastructure around the world. Performing the DRI consists of counting numerous distress features (i.e. cl

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Pesch, Alexander Hans. "Damage Detection of Rotors Using Magnetic Force Actuator: Analysis and Experimental Verification." Cleveland, Ohio : Cleveland State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1229016747.

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Thesis (M.S.)--Cleveland State University, 2008.<br>Abstract. Title from PDF t.p. (viewed on Mar. 17, 2009). Includes bibliographical references (p. 75-81) and appendices. Available online via the OhioLINK ETD Center. Also available in print.

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Hou, Chuanchuan. "Vibration-based damage identification with enhanced frequency dataset and a cracked beam element model." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/20434.

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Damage identification is an important topic in structural assessment and structural health monitoring (SHM). Vibration-based identification techniques use modal data to identify the existence, location and severity of possible damages in structures, often via a numerical model updating procedure. Among other factors influencing the practicality and reliability of a damage identification approach, two are of primary interest to this study. The first one concerns the amount and quality of modal data that can be used as ‘response’ data for the model updating. It is generally recognised that natur

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