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Добірка наукової літератури з теми "Continuous damage"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Continuous damage"

Zhu, Jia Wei, Dan Ting Zhou, and Qiu Wei Yang. "Damage Localization for a Continuous Beam by the Displacement Variation." Applied Mechanics and Materials 744-746 (March 2015): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.366.

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Using the static displacement data, this paper presented a damage localization method for a continuous beam. This method is based on the estimation of changes in the static displacements of the structure. The most significant advantage of the method is that it does not require development of an analytical model of the structure being tested. All predictions are made directly from the measurments taken on the structure. The efficiency of the proposed method is demonstrated using simulated data of a three-span continuous beam. The results showed that the region in which the displacement variation is maximum is the damaged region for the continuous beam. Regardless of damages being small or large, the proposed method can identify locations of structural damages accurately only using the displacement changes under the applied static load. The proposed procedure is economical for computation and simple to implement. The presented scheme may be useful for damage localization of the continuous beam.

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Yuan-Sheng, Cheng, and Huang Yungbin. "Measurement of continuous damage parameter." Engineering Fracture Mechanics 31, no. 6 (January 1988): 985–92. http://dx.doi.org/10.1016/0013-7944(88)90209-3.

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ALVANDI, A., J. BASTIEN, E. GRÉGOIRE, and M. JOLIN. "BRIDGE INTEGRITY ASSESSMENT BY CONTINUOUS WAVELET TRANSFORMS." International Journal of Structural Stability and Dynamics 09, no. 01 (March 2009): 11–43. http://dx.doi.org/10.1142/s0219455409002874.

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The potential of continuous wavelet transforms for damage assessment of existing bridges is investigated herein. Different types of continuous wavelet transforms have been under investigation and the most effective ones have been introduced in a toolbox to automate the damage assessment procedure. In this paper, the performance of the wavelet approach and the influence of different parameters in the damage assessment procedures are studied through two examples: a simply supported beam and a three-span concrete bridge. Applying the wavelet transforms to a structure's static and/or dynamic response showed promising results with regard to localization of structural modification or damage. This paper underlines the high sensitivity of the wavelet analysis to damage intensity and its ability to be applied directly to the damaged data. These key characteristics could lead to this approach becoming one of the best for structural health monitoring of existing bridges in the near future.

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Cheng, Qifeng, Xuzhi Ruan, Yize Wang, and Zhiwei Chen. "Serious Damage Localization of Continuous Girder Bridge by Support Reaction Influence Lines." Buildings 12, no. 2 (February 5, 2022): 182. http://dx.doi.org/10.3390/buildings12020182.

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A novel damage detection approach is proposed in this study for a continuous girder bridge in which support reaction influence lines (ILs) are adopted. First, the relationship between the local damage of a continuous girder bridge and a damage index, based on support reaction ILs, is established through analytical derivation. Subsequently, the sensitivity of a support reaction IL-based damage index is analyzed using Dempster-Shafer (D-S) evidence theory, and it shows that the support reaction IL-based damage index is more noise-resistant if more support reaction ILs from a variety of locations are used. Three case studies (a simple numerical study of a two-span continuous beam, a laboratory experimental study of a two-span aluminum beam, and a complicated numerical study of a continuous girder bridge in Xiamen) have been conducted to validate the effectiveness of the proposed method in different damage scenarios, including single damage and multiple damages. Satisfactory damage identification results can be obtained even in high-level measurement noise conditions, showing that the proposed approach offers a promising field detection technique for identifying local structural damages in continuous girder bridges.

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Ciambella, J., A. Pau, and F. Vestroni. "Modal curvature-based damage localization in weakly damaged continuous beams." Mechanical Systems and Signal Processing 121 (April 2019): 171–82. http://dx.doi.org/10.1016/j.ymssp.2018.11.012.

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Huang, Shengnan, Lieping Ye, and Xinzheng Lu. "Damage Identification of Continuous Rigid Frame Concrete Bridge." Open Civil Engineering Journal 8, no. 1 (September 4, 2014): 193–200. http://dx.doi.org/10.2174/1874149501408010193.

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During a bridge service life, many factors can cause damage accumulation such as overloaded traffic, fatigue effect, and so on. Hence, the identification of potential damages has been received wide attention to prevent such sudden fatal accident. An experiment of a continuous rigid frame concrete bridge, which had 3 spans and a total length of 18 meters, was presented in this paper. Two load stages and ten different load steps were simulated to test various scenario of long-term loading and different levels of overload. Curvature mode method was adopted to detect the damage during the exercises. The changes of curvature modes were used to detect damage after the ten load steps. This method performed excellent to identify the damage position of the bridge. So, it is concluded that the curvature modes can be used to detect damage in actual structures. In addition, the Finite-Element Analysis (FEA) was utilized, and the experimental recurring was verified positively through FEA model.

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Pukkala, Timo, Olavi Laiho, and Erkki Lähde. "Continuous cover management reduces wind damage." Forest Ecology and Management 372 (July 2016): 120–27. http://dx.doi.org/10.1016/j.foreco.2016.04.014.

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Li, Z. H., and F. T. K. Au. "Damage Detection of a Continuous Bridge from Response of a Moving Vehicle." Shock and Vibration 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/146802.

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This paper presents a multistage multipass method to identify the damage location of a continuous bridge from the response of a vehicle moving on the rough road surface of the bridge. The vehicle runs over the bridge several times at different velocities and the corresponding responses of the vehicle can be obtained. The vertical accelerations of the vehicle running on the intact and damaged bridges are used for identification. The multistage damage detection method is implemented by the modal strain energy based method and genetic algorithm. The modal strain energy based method estimates the damage location by calculating a damage indicator from the frequencies extracted from the vehicle responses of both the intact and damaged states of the bridge. At the second stage, the identification problem is transformed into a global optimization problem and is solved by genetic algorithm techniques. For each pass of the vehicle, the method can identify the location of the damage until it is determined with acceptable accuracy. A two-span continuous bridge is used to verify the method. The numerical results show that this method can identify the location of damage reasonably well.

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SUGIYAMA, Hirofumi, Kazumi MATSUI, Takahiro YAMADA, and Shigenobu OKAZAWA. "Ductile fracture simulations by damage model based on continuous damage mechanics." Proceedings of The Computational Mechanics Conference 2017.30 (2017): 307. http://dx.doi.org/10.1299/jsmecmd.2017.30.307.

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Chauhan, R. S., and N. E. Dweltz. "Damage to Continuous-filament Yarns during Weaving." Journal of the Textile Institute 79, no. 1 (January 1988): 79–90. http://dx.doi.org/10.1080/00405008808659154.

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Більше джерел

Дисертації з теми "Continuous damage"

DOMINGUES, STELLA MARIS PIRES. "ANALYSIS OF BRITTLE ELASTIC MATERIALS THROUGH A CONTINUOUS DAMAGE MODEL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33202@1.

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Анотація:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Este trabalho lida com uma teoria de dano contínuo, desenvolvida em um contexto termodinâmico, capaz de realizar uma descrição macroscópica da degradação de um material induzida pela deformação em estruturas elásticas frágeis (isto é, falha ocorre sem deformações permanentes). Na modelagem, supõe-se que a energia livre de Helmholtz não depende apenas da deformação e da temperatura absoluta, mas também da variável dano e de seu gradiente. Além disso, para levar em conta os efeitos microscópicos, a potência dos esforços internos não depende apenas da velocidade e de seu gradiente, mas também da taxa de evolução do dano e de seu gradiente. Apesar da sofisticação mecânica da teoria, uma técnica numérica simples, baseada no método dos elementos finitos, é proposta para aproximar a solução dos problemas matemáticos não lineares resultantes. Nestes problemas o acoplamento entre as variáveis dano e deformação é contornado por meio da técnica de partição dos operadores. Para validar o modelo e investigar as características principais do método numérico, diversos exemplos são apresentados para mostrar que os algoritmos utilizados não são sensíveis à malha (mesh dependent).
The present work deals with a continuum damage theory, developed within a thennodynamical framework, able to perform a macroscopic description of material degradation induced by deformation in brittle elastic structures (i.e. failure occurs without permanent deformations). In the modeling, the Helmholtz free energy is supposed to depend not only on the strain and on the absolute temperature but on a damage variable and its gradient as well. Besides, to account for microscopic effects, the power of internal forces depends not only on the velocity and its gradient, but also on the damage velocity and its gradient. Despite the mechanical sophistication of the theory, a simple numerical technique, based on the únite element method, is proposed to approximate the solution of the resulting non linear mathematical problems. The coupling between damage and strain variables in these problems is circumvented by means of a splitting technique. In order to analyse the physical coherence of the model and to access the main features of the numerical method, a number of examples is presented showing that the numerical computations are not mesh dependent.

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CHIMISSO, FULVIO ENRICO GIACOMO. "A CONTINUOUS DAMAGE MODEL FOR MATERIALS WITH ELASTIC-PLASTIC BEHAVIOR." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33238@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A Mecânica do Dano Contínuo é uma ferramenta promissora para a análise de vida residual em componentes de máquinas e de estruturas. Todavia, não é uma tarefa simples a de se obter uma descrição fisica realística, associada a uma descrição matemática correta, do acoplamento entre a deformação e o amolecimento causado pela degradação da microestrutura. No caso de barras metálicas, a deformação plástica cíclica causa um endurecimento junto com uma degradação na estrutura (dano de fadiga). Por outro lado, a degradação da estrutura induz o amolecimento observado na curva tensão de engenharia vs. deformação. Logo, torna-se importante a modelagem do acoplamento entre plasticidade e dano para que se possa prever de maneira adequada o tempo de vida (ciclos), de um componente estrutural. Muitas tentativas feitas para descrever este tipo de comportamento mostraram-se insatisfatórias. O problema matemático é, em geral, mal posto e uma aproximação numérica da solução é incorreta do ponto de vista fisico. Nestes casos, o fenômeno de localização da deformação é malha-dependente. No presente trabalho, propõe-se uma nova teoria de dano para materiais elasto-plásticos que supera este problema. A teoria tem uma forte base termodinâmica e leva em conta o fenômeno de amolecimento. Uma diferença básica em relação a outros modelos consiste no fato de que a variável escalar D, associada ao dano, é considerada não apenas uma variável de estado mas também uma variável cinemática independente, com abordagem semelhante à apresentada nas teorias de contínuo com microestrutura. As possibilidades de utilização da teoria apresentada são verificadas através da comparação de simulações numéricas com resultados experimentais, para solicitações cíclicas uniaxiais, em barras de almnínioestrutural e em barras de aço austenitico AISI 316 L.
Continuum Damage Mechanics is a promising tool for the failure prediction of structural components. Nevertheless, it is not a simple task to do a mathematically correct and physically realistic description of the strain-softcning behavior due to the degradation of the microstructure. In the case of metallic bars, the cyclic plastic deformation induces a strain-hardening and also a degradation of the structure (fatigue damage). In the other hand, the degradation of the structure induces a softening behavior in the engineering stress-strain curve. Hence, it is very important to model the coupling between plasticity and damage in order to perform an adequate lifetime prevision. Many attempts to describe this type of behavior have been unsatisfatory. The mathematical problem is, in general, ill posed and a numerical approximation of the solution is incorrect from the physical point of view. In this cases the phenomenon of strain localization due to strain-soflzening is mesh dependent. In the present work a new Damage theory for elasto-plastic materials that overcome this problem is proposed. The theory has a strong thermodynarnic basis and take into account the softening behavior. One basic difference from the others models is that the scalar variable D related with damage is taken as an independent kinematic variable, similarly as in the theories of continua with microstructure. The effectiveness and usefulness of the theory is checked by comparing numerical simulations of cyclic uniaxial tests in Aluminiun bars and 316L stainless steel bars with experimental results.

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Chen, Fuh-Sheng. "Damage and failure analysis of continuous fiber-reinforced polymer composites." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056554068.

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Reese, Sven H. "Adaptive methods for continuous and discontinuous damage modeling in fracturing solids /." Hannover : IBNM, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016312191&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Salleh, Ramli. "Monitoring of damage in continuous fibre reinforced composites by using acoustic emission." Thesis, University of Manchester, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488255.

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Yang, Fangtao. "Simulation of continuous damage and fracture in metal-forming processes with 3D mesh adaptive methodology." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2385/document.

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Ces travaux s'inscrivent dans le cadre des recherches menées dans le cadre d'une collaboration entre le laboratoire Roberval de l'Université de Technologie de Compiègne et l'équipe dans le cadre du projet ANR-14-CE07-0035 LASMIS de l'Institut Charles Delaunay de l'Université de Technologie de Troyes. Nous présentons dans ces travaux une h-méthodologie adaptative tridimensionnelle des éléments finis afin de représenter l'initiation et la propagation des fissures dans des matériaux ductiles. Un modèle élasto-plastique couplé à l'endommagement isotrope proposé par l'équipe du LASMIS/UTT est utilisé. Les applications visées à terme concernent principalement la mise en forme des métaux. Dans ce contexte, une formulation Lagrangienne actualisée est employée et des remaillages fréquents s'avèrent essentiels afin d'une part d'éviter les fortes distorsions d'éléments dues aux grandes déformations plastiques et d'autre part de suivre les modifications de la topologie résultant de la création de fissures. La taille du nouveau maillage doit permettre à moindre coût représenter avec précision l'évolution des gradients des quantités physiques représentatives des phénomènes étudiées (plasticité, endommagement...). Nous proposons des indicateurs empiriques de taille d'éléments basés sur la déformation plastique ainsi que sur l'endommagement. Une courbe définie par morceau représente l'évolution de la taille d'élément suivant la sévérité de la plasticité et le cas échéant de l'endommagement. Les fissures sont représentées par une méthode de destruction d'éléments qui permet une description aisée de la géométrie de ces dernières et une gestion simplifiée de la fissuration sans nul besoin de critères additionnels. En revanche, pour permettre une description réaliste des fissures, ces dernières doivent être représentées par l'érosion des éléments de plus petite taille. Un solveur ABAQUS/Explicit® est utilisé avec des éléments tétraédriques quadratiques (C3D10M) évitant notamment les problèmes de verrouillage numérique survenant lors de l'analyse de structures en matériau compressible ou quasi-incompressible. Le contrôle de la plus petite taille du maillage est important dans un contexte explicite. De surcroît, pour les phénomènes adoucissant, la solution dépend de la taille de maille considérée alors comme un paramètre intrinsèque. Une étude nous a permis de constater que lorsque le maillage est suffisamment raffiné, les effets de la dépendance au maillage se réduisaient. Dans la littérature, les coûts de maillage ou de remaillage fréquents sont souvent considérés comme prohibitifs et de nombreux auteurs s'appuient sur cet argument pour introduire, avec succès certes, des méthodes alternatives qui limitent le coût des opérations de remaillage sans toutefois les éliminer (XFEM par exemple). Nos travaux montrent que le coût d'un remaillage local est négligeable par rapport au calcul. Compte tenu de la complexité de la géométrie et de la nécessité de raffiner le maillage, la seule alternative à ce jour est d'utiliser un mailleur en tétraèdres. La stratégie de remaillage local en tétraèdre s'appuie sur une méthode de bisection suivie si nécessaire d'une optimisation locale du maillage proposé par A. Rassineux en 2003. Le remaillage, même local, doit s'accompagner de procédures de transfert de champ des variables nodales et aux points d'intégration. Les variables nodales sont, comme le fait la plupart des auteurs, transférées en utilisant les fonctions de forme éléments finis. Le transfert de champ en 3D aux points de Gauss et les nombreux problèmes sous-jacents ont été relativement peu abordés dans la littérature
This work is part of the research carried out in the framework of a collaboration between the Roberval laboratory of the Compiègne University of Technology and the team within the framework of the project ANR-14-CE07-0035 LASMIS of the Charles Delaunay Institute of Technology University of Troyes. In this work, we present a three-dimensional adaptive Pi-methodology of finite elements to represent the initiation and propagation of cracks in ductile materials. An elastoplastic model coupled with the isotropic damage proposed by the LASMIS / UTT team is used. The targeted applications will mainly concern the metal forming. In this context, an updated Lagrangian formulation is used and frequent remeshing is essential in order to avoid the strong distortion of elements due to large plastic deformations and to follow the modifications of the topology resulting in the creation of cracks. The size of the new mesh must allow at a lower cost to accurately represent the evolution of the gradients of the physical quantities representative of the studied phenomena (plasticity, damage ...). We propose empirical indicators of size of elements based on the plastic deformation as well as on the damage. A piecewise defined curve represents the evolution of the element size according to the severity of the plasticity and, if appropriate, the damage. The cracks are represented by a method of destruction of elements which allows an easy description of the geometry and a simplified treatment of the cracking without any need for additional criteria. On the other hand, to allow a realistic description of the cracks, the latter must be represented by erosion smaller elements. An ABAQUS / Explicit@ solver is used with quadratic tetrahedral elements (C3DIOM), avoiding in particular the problems of numerical locking occurring during the analysis of structures in compressible or quasi-incompressible material. The control of the smaller mesh size is important in an explicit context. In addition, for softening phenomena, the solution depends on the mesh size considered as an intrinsic parameter. A study has shown that when the mesh is sufficiently refined, the effects of mesh dependence are reduced. In the literature, the costs of frequent meshing or remeshing are often considered prohibitive and many authors rely on this argument to introduce, with success, alternative methods that limit the cost of remeshing operations without eliminating them ( XFEM for example). Our work shows that the cost of local remeshing is negligible compared to the calculation. Given the complexity of the geometry and the need to refine the mesh, the only alternative to date is to use a mesh in tetrahedra. The strategy of local remeshing tetrahedron is based on a bisection method followed if necessary by a local optimization of the grid proposed by A. Rassineux in 2003. The remeshing, even local, must be accompanied by field transfer procedures on both nodal variables and integration points. Node variables are, as most authors do, transferred using finite element shape functions. The 3D field transfer at Gauss points and the many underlying problems have been relatively untouched in the literature. The main difficulties to be solved in order to ensure the "quality" of the transfer concern the limitation of numerical diffusion, the lack of information near borders, the respect of boundary conditions, the equilibrium, the calculation costs, the filtering of the information points, crucial problems in 3D where the number of Gauss points used is several hundred. We propose a so-called "hybrid" method which consists, initially, in extrapolating the data at the Gauss points, in the nodes by diffuse interpolation and then in using the finite element form functions to obtain the value at the point considered

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Thiriot, Kathleen Nichole. "The Effect of Photobiomodulation Therapy on Exercise-Induced Muscle Damage." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6743.

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Purpose: To explore the difference between continuous and pulsed photobiomodulation (PBMT) versus a placebo treatment when using a red-blue light combination over multiple treatment sessions to decrease the symptoms of muscle damage in the quadriceps muscle after a bout of muscle damaging exercise. Methods: Thirty-six healthy, nonactive male and female participants were randomly assigned to one of three groups: continuous PBMT, pulsed PBMT, and placebo treatment. Participants were assessed for muscle damage with knee extension maximal isometric and isokinetic contractions, as well as Visual Analog Scale (VAS) and Lower Extremity Functional Scale (LEFS) scores. Blood creatine kinase (CK) was also analyzed. Participants were given treatment immediately prior to undergoing a bout of damaging eccentric exercise. Participants were treated with PBMT for the next 4 consecutive days for a total of 5 treatments. Results: The continuous treatment group lost significantly less isokinetic average peak torque than the placebo treatment when averaged across all time points postexercise. However, for isometric testing, the continuous group had more reduction in force compared to the placebo group. Between the treatment groups, the continuous treatment group had significantly more muscle soreness measured by the VAS and had significantly less function in daily tasks reported on the LEFS patient-oriented outcome scale. There was no significant difference in level of creatine kinase between the treatment groups. Conclusion: Pulsed photobiomodulation treatments had no significant effect when compared to the placebo group. Continuous photobiomodulation helped to reduce isokinetic force loss, yet exacerbated all other muscle damage markers following exercise relative to the placebo condition.

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DATTA, SAURABH. "ACTIVE FIBER COMPOSITE CONTINUOUS SENSORS FOR STRUCTURAL HEALTH MONITORING." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1061293378.

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Gundmi, Satish Sajjan. "Continuous Time Fatigue Modelling for Non-proportional Loading." Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-164950.

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Fatigue analysis is a critical stage in the design of any structural component. Typically fatigue is analysed during post-processing, but as the size of the analysed component increases, the amount of data stored for the analysis increases simultaneously. This increases the computational and memory requirements of the system, intensifying the work load on the engineer. A continuum mechanics approach namely ’Continuous time fatigue model’, for fatigue analysis is available in a prior study which reduces the computational requirements by simultaneously computing fatigue along with the stress. This model implements a moving endurance surface in the stress space along with the damage evolution equation to compute high-cycle fatigue. In this thesis the continuous time fatigue model is compared with conventional model (ie.Cycle counting) to study its feasibility. The thesis also aims to investigate the continuous time fatigue model and an evolved version of the model is developed for non-proportional load cases to identify its limitations and benefits.

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Denaux, Matthieu. "Simulation numérique de la criticité à amorçage de fissure de fretting induit par un chargement vibratoire : Application aux liaisons pale/disque de turbomachine." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI012.

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Анотація:

Le fretting est un endommagement induit par le glissement cyclique à très faible amplitude de deux corps en contact. Il se caractérise par un amorçage d’une fissure en surface, qui peut ensuite propager, menant ainsi à la rupture. Le fretting est présent dans de nombreux secteurs industriels où il constitue un critère de résistance à la fatigue plus ou moins sévère. Ce mémoire s’intéresse aux fissures de fretting qui apparaissent dans une liaison entre pale et disque d’une turbomachine. La sollicitation cyclique de contact est dans ce cas le fruit de la combinaison d’un chargement statique à un chargement vibratoire à très haute fréquence (quelques milliers de Hertz). Pouvoir estimer la durée de vie de la liaison sous un tel chargement est indispensable pour la sécurité des vols. La méconnaissance de certains paramètres d’entrée, la non-proportionnalité du chargement ainsi que les fortes concentrations de contraintes mises en jeu, sont autant de verrous techniques à la modélisation. Ce mémoire de thèse propose une méthode numérique permettant le calcul d’une criticité à amorçage de fretting sous sollicitation vibratoire. Le modèle se décompose en une première phase de calcul des contraintes et déformations cycliques par éléments finis, suivie d’une seconde qui consiste à post-traiter les résultats avec le critère de Dang Van. Le modèle est développé grâce au support d’un banc d’essai innovant qui permet de reproduire les chargements subis par un contact d’une liaison pale/disque. Une utilisation intensive du processus de calcul mis au point permet de tirer des conclusions et de mieux comprendre les phénomènes mis en jeu dans ce type d’endommagement. Une confrontation des différentes études numériques réalisées permet de comparer la représentativité des moyens expérimentaux par rapport aux configurations moteurs réelles
Fretting is a damage induced by small cyclic slip of two bodies in contact. It is characterized by surface crack initiation, which can then propagate, thus leading to failure. Fretting is present in many industrial environments where it is a more or less severe resistance criterion. This work focuses on the fretting cracks that appear in blade/disk roots of turboshaft engines. In this case, the cyclic contact loading is the result of the combination of a static loading and a high frequency vibratory loading (some thousands of Hertz). Being able to estimate the lifetime of the root under such a solicitation is essential for flight safety. The lack of knowledge of certain input parameters, the non-proportionality of the solicitation as well as the high stress gradient involved, make this phenomenon difficult to predict. This work proposes a numerical method allowing the computation of a fretting crack initiation criterion. First, stresses and deformations fields are computed with finite element method. Then, the post-processing of the fields is done woth Dang Van criterion. The model is developed with the support of an innovative test bench which makes it possible to reproduce the loadings sustained by a a blade/disk root. An intensive use of the computation process developed makes it possible to draw conclusions and provides better understanding of the phenomenon involved in this type of damage. The different numerical studies carried out make it possible to compare the representativeness of the experimental means with respect to the actual engine configurations

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Книги з теми "Continuous damage"

Johnson, W. S. Fatigue damage growth mechanisms in continuous fiber reinforced titanium matrix composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Robinson, David N. A continuous damage model based on stepwise-stress creep rupture tests. [Washington, D.C.]: National Aeronautics and Space Administration, 1985.

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Johnson, W. S. Fatigue damage growth mechanisms in continuous fiber reinforced titanium matrix composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Johnson, W. S. Fatique testing and damage development in continuous fiber reinforced metal matrix composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1988.

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Salleh, R. Monitoring of damage in continuous fibre reinforced composites by using acoustic emission. Manchester: UMIST, 1996.

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Murakami, Sumio. Continuum Damage Mechanics. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-2666-6.

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Krajcinovic, Dusan. Damage mechanics. Amsterdam: Elsevier, 1996.

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Krajcinovic, D. Damage mechanics. Amsterdam: Elsevier, 1996.

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Kachanov, L. M. Introduction to continuum damage mechanics. Dordrecht: Springer Netherlands, 1986.

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Kachanov, L. M. Introduction to continuum damage mechanics. Dordrecht: M. Nijhoff, 1986.

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Частини книг з теми "Continuous damage"

Najar, Jerzy. "Continuous Damage of Brittle Solids." In Continuum Damage Mechanics Theory and Application, 233–94. Vienna: Springer Vienna, 1987. http://dx.doi.org/10.1007/978-3-7091-2806-0_7.

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Loget, Olivier, Camélia Nanuel, Jean-François Le Bigot, and Roy Forster. "Corneal Damage Following Continuous Infusion in Rats." In Advances in Ocular Toxicology, 55–62. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5937-5_6.

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Bodgi, Johanna, Silvano Erlicher, and Pierre Argoul. "Lateral Vibration of Footbridges under Crowd-Loading: Continuous Crowd Modeling Approach." In Damage Assessment of Structures VII, 685–90. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-444-8.685.

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Limongelli, Maria Pina, Emil Manoach, Said Quqa, Pier Francesco Giordano, Basuraj Bhowmik, Vikram Pakrashi, and Alfredo Cigada. "Vibration Response-Based Damage Detection." In Structural Health Monitoring Damage Detection Systems for Aerospace, 133–73. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72192-3_6.

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AbstractThis chapter aimed to present different data driven Vibration-Based Methods (VBMs) for Structural Health Monitoring (SHM). This family of methods, widely used for engineering applications, present several advantages for damage identification applications. First, VBMs provide continuous information on the health state of the structure at a global level without the need to access the damaged elements and to know their location. Furthermore, damage can be identified using the dynamic response of the structure measured by sensors non-necessarily located in the proximity of damage and without any prior knowledge about the damage location. By principle, VBMs can identify damage related to changes in the dynamic properties of structures, such as stiffness variations due to modifications in the connections between structural elements, or changes in geometric and material properties. A classification of different VBMs was presented in this chapter. Furthermore, several case studies were presented to demonstrate the potential of these methods.

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Lee, K. S., and Chang Sik Choi. "Discrete-Continuous Configuration Optimization Methods for Structures Using the Harmony Search Algorithm." In Fracture and Damage Mechanics V, 1293–96. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.1293.

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Mazars, J., G. Pijaudier-Cabot, and C. Saouridis. "Size effect and continuous damage in cementitious materials." In Current Trends in Concrete Fracture Research, 159–73. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3638-9_11.

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Herrmann, G. "Thermodynamic Aspects of Continuous Damage in Brittle Solids." In Patterns, Defects and Microstructures in Nonequilibrium Systems, 287–99. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3559-4_17.

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Bauer, Erich. "Simulation of the Influence of Grain Damage on the Evolution of Shear Strain Localization." In Continuous Media with Microstructure 2, 231–44. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28241-1_16.

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Kogut, Peter I., and Günter Leugering. "On Existence of Optimal Solutions to Boundary Control Problem for an Elastic Body with Quasistatic Evolution of Damage." In Continuous and Distributed Systems, 265–86. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-03146-0_19.

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Jirásek, M. "Modeling of localized damage and fracture in quasibrittle materials." In Continuous and Discontinuous Modelling of Cohesive-Frictional Materials, 17–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44424-6_2.

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Тези доповідей конференцій з теми "Continuous damage"

Qi, Chaojie, and Yufeng Sun. "Multi-damage life assessment under continuous damage mechanics." In 2016 Prognostics and System Health Management Conference (PHM-Chengdu). IEEE, 2016. http://dx.doi.org/10.1109/phm.2016.7819925.

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Taylor, L. N., and J. J. Talghader. "Ring-like damage morphologies produced by continuous-wave laser irradiation." In SPIE Laser Damage, edited by Gregory J. Exarhos, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, and MJ Soileau. SPIE, 2014. http://dx.doi.org/10.1117/12.2067956.

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O'Rourke, Michael. "Wave Propagation Damage to Continuous Pipe." In Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41050(357)76.

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Moon, Ralph E. "Interpreting Continuous v. Repeated Water Damage." In Sixth Congress on Forensic Engineering. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412640.028.

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Shan, Haiyang, Xueke Xu, Hongbo He, Shijie Liu, Chaoyang Wei, Kui Yi, and Jianda Shao. "The figure simulation of the polishing pad in the continuous polishing process." In Pacific-rim Laser Damage, edited by Takahisa Jitsuno, Jianda Shao, and Wolfgang Rudolph. SPIE, 2014. http://dx.doi.org/10.1117/12.2073492.

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Papernov, S., A. A. Kozlov, J. B. Oliver, T. J. Kessler, and B. Marozas. "Near-ultraviolet absorption-annealing effects in HfO2thin films subjected to continuous-wave laser irradiation at 355 nm." In SPIE Laser Damage, edited by Gregory J. Exarhos, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, and MJ Soileau. SPIE, 2013. http://dx.doi.org/10.1117/12.2031640.

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Sancho, Alexander, Paul A. Hooper, and Catrin M. Davies. "Ductile Damage Assessment Using Continuum Damage Mechanics and Methodology for High Strain-Rate Damage Analysis." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65097.

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Анотація:

The interest of this research is to assess the experimental techniques used for ductile damage measurement both in quasistatic and high strain-rate conditions. The results can later be used for the calibration of Continuum Damage Mechanics (CDM) models. A procedure for the evaluation of damage accumulation in quasi-static conditions is presented. The technique used to measure damage is based on the elastic modulus calculation from unloading and reloading cycles performed at different stages of plastic deformation. Tests have been performed in a continuous manner and the strain variations have been recorded using a small gauge extensometer. This methodology includes a second experiment in which the geometry of the specimen is monitored, allowing to extract the true stress-strain behaviour of the material even after necking phenomenon starts. The proposed methodology has been applied to stainless steel 304L. Regarding the high strain-rate conditions, a continuous test cannot be performed due to physical as well as practical difficulties. Therefore, an interrupted methodology has been devised in which the plastic deformation is applied at high strain-rate and the damage measurement is performed separately in quasi-static conditions. An experimental rig has been developed to interrupt high-speed tensile tests at strain-rates up to 103s−1. Its design and preliminary calibration are analysed and its future use for damage assessment discussed.

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Wang, Xiang-Jian, En-Dong Guo, Tian-Yang Yu, and Qian Li. "Earthquake damage estimation of gas continuous buried pipelines." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.336.

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Puttick, Keith E., Rune Holm, Detlev Ristau, Urs Natzschka, George Kiriakidis, Nirmal Garawal, Eddie Judd, et al. "Continuous-wave CO2-laser-induced damage thresholds in optical components." In Laser-Induced Damage in Optical Materials: 1997, edited by Gregory J. Exarhos, Arthur H. Guenther, Mark R. Kozlowski, and M. J. Soileau. SPIE, 1998. http://dx.doi.org/10.1117/12.307045.

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Brown, Andrew, Albert Ogloza, Kyle Olson, and Joseph Talghader. "Contamination mediated continuous-wave laser damage of optical materials." In 2016 IEEE Photonics Conference (IPC). IEEE, 2016. http://dx.doi.org/10.1109/ipcon.2016.7831178.

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Звіти організацій з теми "Continuous damage"

Krajcinovic, D. [Continuous damage mechanics: Critical states: Technical progress report]. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/10147276.

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Allen, D. H. Research on Damage Models for Continuous Fiber Composites. Fort Belvoir, VA: Defense Technical Information Center, July 1988. http://dx.doi.org/10.21236/ada200771.

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Krajcinovic, D. (Continuous damage mechanics: Critical states: Technical progress report). Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5272669.

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Allen, D. H., and C. E. Harris. Research on Damage Models for Continuous Fiber Composites. Fort Belvoir, VA: Defense Technical Information Center, February 1986. http://dx.doi.org/10.21236/ada175017.

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Allen, D. H., W. E. Haisler, and C. E. Harris. Research on Damage Models for Continuous Fiber Composites. Fort Belvoir, VA: Defense Technical Information Center, February 1985. http://dx.doi.org/10.21236/ada164121.

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Kinra, Vikram K. Ultrasonic Nondestructive Evaluation of Damage in Continuous Fiber Composites. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada205713.

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Kinra, Vikram K. Ultrasonic Nondestructive Evaluation of Damage in Continuous Fiber Composites. Fort Belvoir, VA: Defense Technical Information Center, April 1985. http://dx.doi.org/10.21236/ada164056.

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Krajcinovic, D. Continuum damage mechanics -- Critical states. Final report. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/584930.

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English, Shawn Allen, and Arthur A. Brown. A 3D Orthotropic Elastic Continuum Damage Material Model. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1113865.

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Lambert, D. E., J. Weiderhold, M. V. Hopson, and J. Osborn. Controlled Loading Fragmentation: Experiments and Continuum Damage Modeling. Fort Belvoir, VA: Defense Technical Information Center, July 2010. http://dx.doi.org/10.21236/ada538370.

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