Thematische Bibliographien / Fatigue stress

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Auswahl der wissenschaftlichen Literatur zum Thema „Fatigue stress“

Autor: Grafiati

Veröffentlicht am 30. Juni 2021

Zuletzt aktualisiert am 11. Februar 2022

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Zeitschriftenartikel zum Thema "Fatigue stress"

Peng, Bin, und Zhen Xing Yue. „Effect of Uniaxial Compressive Stress on the Partially Fatigued Soft Lead Zirconate Titanate Piezoelectric Ceramics“. Key Engineering Materials 602-603 (März 2014): 817–21. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.817.

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Uniaxial compressive stress was applied during fatigue process of soft lead zirconate titanate piezoelectric ceramics and their fatigue resistance was improved when the stress was larger than 20MPa. Before fatigue, compressive stress had a strong depolarization effect and restricted domains switching behavior under large electric field and domain walls motion under small electric field. However, in a partially fatigued state, while domains switching behavior was still restricted by compressive stress, domain walls motion was enhanced. Removal of the applied stress after partial fatigue induced the remnant polarization restored significantly.

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JAYAPRAKASH, Murugesan, und Yoshiharu MUTOH. „PS55 Generalized Tangential Stress Range-Compressive Stress Range Diagram for Predicting Fretting Fatigue Strength“. Proceedings of the Materials and Mechanics Conference 2010 (2010): 171–73. http://dx.doi.org/10.1299/jsmemm.2010.171.

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Segal, BM, W. Thomas, X. Zhu, A. Diebes, G. McElvain, E. Baechler und M. Gross. „Oxidative stress and fatigue in systemic lupus erythematosus“. Lupus 21, Nr. 9 (16.04.2012): 984–92. http://dx.doi.org/10.1177/0961203312444772.

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Objective: The objective of this study is to investigate the relationship of oxidative stress to fatigue in systemic lupus erythematosus (SLE). Methods: Patients with a confirmed diagnosis of SLE by ACR criteria and healthy controls completed validated questionnaires to assess depression and fatigue. Fatigue was measured with the Fatigue Severity Scale (FSS) and the Profile of Fatigue (Prof-F). Visual analogue scales (VAS) were also used to assess fatigue and pain. Depression was measured with the Center for Epidemiologic Studies Depression Scale (CES-D). Plasma F2-isoprostane was measured with gas chromatography/mass spectroscopy to assess oxidative stress. Evaluation included medical record review, physical exam and calculation of body mass index (BMI), disease activity (SLEDAI) and damage (SLICC) in the SLE patients. Results: Seventy-one SLE patients with low disease activity (mean SLEDAI = 1.62 standard error (SE) 0.37, range 0–8) were compared to 51 controls. Fatigue-limiting physical activity (defined as FSS ≥ 4) was present in 56% of patients and 12% of controls. F2-isoprostane was higher in SLE patients with fatigue compared to not-fatigued SLE subjects ( p = .0076) who were otherwise similar in ethnicity, disease activity and cardiovascular risk factors. Plasma F2-isoprostane was strongly correlated with FSS and Profile of Somatic Fatigue (Prof-S) ( p < .0001), VAS fatigue ( p = .005), CES-D ( p = .008) and with BMI ( p = .0001.) In a multivariate model, F2-isoprostane was a significant predictor of FSS after adjustment for age, BMI, pain and depression ( p = .0002). Conclusion: Fatigue in SLE patients with low disease activity is associated with increased F2-isoprostane. F2-isoprostane could provide a useful biomarker to explore mitochondrial function and the regulation of oxidative pathways in patients with SLE in whom fatigue is a debilitating symptom.

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Friedberg, Fred. „The Stress/Fatigue Link in Chronic Fatigue Syndrome“. Journal of Chronic Fatigue Syndrome 1, Nr. 3-4 (Januar 1995): 147–52. http://dx.doi.org/10.1300/j092v01n03_23.

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Zhou, Yan Fen, Stephen Jerrams, Lin Chen und Mark Johnson. „The Determination of Multi-Axial Fatigue in Magnetorheological Elastomers Using Bubble Inflation“. Advanced Materials Research 875-877 (Februar 2014): 507–11. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.507.

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Fatigue life is one of the most important physical characteristic that is investigated by materials engineers and scientists. The high dynamic loading experienced by machine parts necessitates understanding fatigue properties in critical components. Despite this requirement, elastomer fatigue criteria are imperfectly understood and even less is known about fatigue resistance in the emerging range of smart elastomers. In this paper, initial research into the equi-biaxial fatigue behaviour of magnetorheological elastomers (MREs) is described. Physical testing was carried out using a bubble inflation testing system. Silicone rubber based test samples were fatigued at different stress amplitudes ranging between 0.75MPa and 1.4MPa using engineering stress as the control mode. S-N (Wöhler) curves showing the plots of stress amplitude (σa) versus cycles to failure (N) are presented. Stress-strain behaviour throughout fatigue process is also described. For a fatigue test at a stress amplitude of 0.75MPa and no pre-stressing, it was found that stress softening occurred for the entire duration of the test, but was particularly pronounced in the first 100 cycles of testing.

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Kondo, Yoshiyuki, H. Eda und Masanobu Kubota. „Fatigue Failure under Varying Loading within Fatigue Limit Diagram“. Materials Science Forum 567-568 (Dezember 2007): 1–8. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.1.

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Although fatigue limit diagram is defined in principle for constant stress amplitude condition, it is often considered that fatigue failure would not occur even in varying loading if applied stresses were kept within the fatigue limit diagram. However, it was shown in the case of small-notched specimen and fretting fatigue that fatigue failure occurred in some special case of variable amplitude loading condition even when all stress amplitudes were kept within the fatigue limit diagram. The cause of this phenomenon was examined using two-step and repeated two-step stress patterns in which the first step stress was with zero mean stress and the second step stress had a high mean stress. A non-propagating crack was formed by the first step stress. This crack functioned as a pre-crack for the second step stress with high mean stress. Consequently, fatigue failure occurred even when all stress amplitudes were kept within the fatigue limit diagram. It was an unexpected fracture caused by the interference effect of non-propagating crack and mean stress change.

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IWASAKI, Chikahiro, und Yasushi IKAI. „Fatigue failure under stress below fatigue limit - From the viewpoint of internal stress.“ Journal of the Society of Materials Science, Japan 34, Nr. 385 (1985): 1133–39. http://dx.doi.org/10.2472/jsms.34.1133.

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Li, Xin. „A new stress-based multiaxial high- cycle fatigue damage criterion“. Functional materials 25, Nr. 2 (27.06.2018): 406–12. http://dx.doi.org/10.15407/fm25.02.406.

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Akiniwa, Yoshiaki, Keisuke Tanaka und Hidehiko Kimura. „Measurement of Stress Distribution Near Fatigue Crack in Ultra-Fine Grained Steel by Synchrotron Radiation“. Materials Science Forum 490-491 (Juli 2005): 118–23. http://dx.doi.org/10.4028/www.scientific.net/msf.490-491.118.

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Single-edge-notched specimens of ultrafine-grained steel were fatigued. The mean grain size of the steel is about 2 micrometers. Propagation behavior of fatigue cracks was observed with the crack closure. The resistance of the crack propagation of ultrafine-grained steel was larger than that of conventional steels. The crack closure acted as an important role for the larger resistance of fatigue crack propagation. After fatigue tests, stress distribution near the fatigue crack was measured by monochromatic X-rays from synchrotron radiation. The irradiated area was 100 µm x 100 µm. Residual and loading stress distributions ahead of the crack tip and on the crack wake was measured at the maximum stress intensity factor and zero applied load. The stress was determined by sin2ψ method. The measured stress was compared with the value calculated by FEM and the fatigue crack propagation model. The stress distribution at the maximum load and residual stresses agreed very well with the calculated results. The crack opening stress calculated by the residual stresses agreed with the experimental result.

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Ohgi, Jun Ji, S. Tanaka, T. Kuramoto, M. Suzuki und Koichi Goda. „Stress-Strain Response in SiC/SiC Composites under Cyclic Loading“. Key Engineering Materials 353-358 (September 2007): 1406–9. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1406.

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The tension-tension fatigue tests for SiC/SiC composites were performed under the conditions that the maximum load Pmax was 80-90% to the fracture load of the tensile tests and the stress ratio was Rσ = 0.5. The composites exhibited a width in stress-strain hysteresis loop under one load cycling. In some cases the mean strain εmean gradually increase with increasing in number of cycles. These variations would reflect the developments of the fatigue damage at the fiber/matrix interface during the cyclic loading process. The pull-out lengths of the fibers for the fatigued- and not fatigued-specimens were measured through the SEM observations after the tensile test. In all materials, the average pull-out length of fibers in fatigued material was larger than in not fatigued material because the cyclic loading affected on the fiber/matrix interfacial strength.

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Dissertationen zum Thema "Fatigue stress"

Bellecave, Johan. „Stress Gradients In Fretting Fatigue“. Thesis, Cachan, Ecole normale supérieure, 2015. http://www.theses.fr/2015DENS0036/document.

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Cette thèse fait partie d’un programme de recherche international (IRG Cognac). Lancé par le motoriste SNECMA (groupe SAFRAN), ce projet regroupe l’ENS Cachan, UnB, ENSMA, CNRS, Snecma, Turbomeca et Messier Bugatti Dowti, et se concentre sur l’effet du gradient des contraintes sur endommagement par fretting fatigue. Le fretting-fatigue se réfère au processus d’endommagement localisés en bord de fuite entre deux corps en contact soumis à un chargement de fatigue. La maitrise de ce phénomène est d’une importance cruciale dans la détermination des durées de vie des disques de turbine. En bord de contact, le champ de contrainte hérité des forces de contact est maximal à la surface mais présente un fort gradient en s’éloignant du contact.Il a été montré dans cette thèse que pour l’alliage Ti-6AL-4V, les approches locales, basés sur le niveau de contrainte au points critiques ne sont pas applicable dans ces conditions. Une approche non locale, s’appuyant sur la théorie de la distance critique a donc été utilisée. En effet, des fissures courtes initiées au point critique peuvent propager jusqu’à rupture ou peuvent s’arrêter si la diminution des contraintes est suffisamment sévère. Une seconde difficulté réside dans la nature multiaxial et localement non proportionnel du chargement. Le fretting fatigue est généralement créé par la superposition d’un chargement de fatigue cyclique, d’une force normale à la surface souvent considérée constante, et d’une force cyclique tangentiel à la surface mais dont la fréquence peut être différente de celle de la fatigue.Les résultats des essais réalisés ont mis en évidence l’effet du gradient des contraintes sur la fissuration et ont étaient utilisés pour évaluer le potentiel de diffèrent critères pour le dimensionnement en fatigue des structures. La simulation du phénomène a en effet été réalisé en utilisant différente approches. La première s’appuie sur la Théorie de la distance critique et utilise un critère multiaxial. La seconde utilise l’amplitude du facteur d’intensité des contraintes, ΔK, pour prédire l’arrêt des fissures courtes. Finalement un récent modèle construit comme un critère de plasticité en pointe de fissure a été appliqué au problème de fretting fatigue. Ce critère a pour particularité de prendre en compte la contrainte T dans le développement asymptotique en pointe de fissure
This thesis is part of an international research program (IRG Cognac) initiated by the engine manufacturer SNECMA (SAFRAN group) involving ENS Cachan, UnB, ENSMA, CNRS, Snecma, Turbomeca et Messier Bugatti Dowty. The thesis focuses on the effect of a stress gradient in fretting fatigue. Fretting-fatigue refers to the damage process localized at the frontier of the contact between two contacting bodies subjected to fatigue loadings. The prediction of this phenomenon is of major importance in determining, for instance, the lifetime of fan's disc. In the vicinity of the contact front, the stress field inherited from the contact loads is maximal at the surface and displays a strong gradient from the surface. It was shown in this thesis, for a Ti-6AL-4V alloy, that local approaches, based on local stresses at the most critical point, are not appropriate to predict fretting fatigue lives. As a matter of fact, short cracks initiated at the most critical point may stop if the stress decay from the surface is strong enough or may continue their growth, up to the failure of the component, if the stress gradient from the surface is not string enough. A second difficulty is the multiaxial and non-proportional nature of the loading conditions. Fatigue-fretting stems from the combination of loads that have neither the same spatial distribution nor the same time-dependency. In fretting-fatigue tests, three loading components are considered, the fatigue loading of the component (cyclic), the normal part (assumed to be constant) and the in-plane part (cyclic) of the loads between the two contacting components. To quantify the effect of the stress gradient, tests were carried out on a fatigue testing contact bench developed at the University of Brasilia, with experimental conditions ensuring different stress gradient while keeping the maximal stress the same. Damage mechanisms were studied using post-mortem analysis and optical microscopy on the contact elements tested. The prediction of the fretting fatigue life was done using different approaches. The first one is based on the Critical Distance Method and a fatigue criterion. The second is based on a K-based short crack arrest method. Finally, a new criterion was proposed. This method considers a generalized von Mises yield criterion for the crack tip region and accounts for the T-stresses in the asymptotic LEFM development

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Li, Henan. „Flexible Pipe Stress and Fatigue Analysis“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18646.

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Fatigue is an important character for the flexible pipes as they are always exposed to dynamic loading. For nonbonded flexible pipes, fatigue and stress analysis can be performed based on different assumptions of slip behaviour. Different slip assumptions used in estimating the slip stress always play a determinative role in the prediction of fatigue damage. Thus, this thesis will focus on the study of the slip behaviour between tensile armour layers of nonbonded flexible pipes. The results can be used to support the basic assumptions for further fatigue analysis. The main object of this thesis is to summarize the existing analytical methods for stress and slip analysis of nonbonded flexible pipe armouring layers and to verify that the improved finite element models can give adequate description of the flexible pipe slip behaviour.In previous version of BFLEX, the transverse slip effect for nonbonded flexible pipes has been neglected. In this thesis, transverse slip regime has been activated in the updated BFLEX by developing a new type of beam element hshear353 and a new type of contact element hcont453. Finite element models use these two elements have been made and several case studies have been carried out.For axisymmetric loading, two analytical solutions, one obtained from the equations by Witz&Tan[13], one from Sævik[2] have been compared with the result from numerical simulation. It has been found that Sævik’s solution matches better with the BFLEX solution comparing to Witz&Tan’s solution. For flexible pipes exposed to bending, influences on slip behaviour from several pipe parameters, namely friction coefficient, axial strain and global pipe curvature, have been investigated. The numerical results are also compared with analytical solutions obtained from Sævik[2]. It has been found that the numerical solutions can give excellent agreement with analytical solutions. It is further concluded that the outer tensile armour layer do not influence much on the inner layer slip behaviour.In addition, the cyclic bending effects on nonbonded flexible pipes have been investigated. It has been found that the tendon behaves differently from case to case. The inner and outer layers behave differently. Only a few cases have been studied for this problem due to time limitation. The overall conclusion is that the developed BFLEX model is capable of describing the stresses and local displacements of flexible pipe for simple cases. The developed numerical model can further be used in the study of fatigue in flexible risers. However, more studies on influence from multi-tensile layers and cyclic bending are needed in the future.

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Nowak, William J. „Fatigue stress analysis of turbine blades /“. Online version of thesis, 2007. http://hdl.handle.net/1850/5467.

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Desmond, Paula A. „Fatigue and stress in driving performance“. Thesis, University of Dundee, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364944.

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This thesis attempted to provide a detailed theoretical understanding of the effects of task-induced fatigue on simulated driving performance. Previous research has shown that duration of driving has only a weak effect on driving performance. A series of studies were conducted to examine how fatigue effects interact with task demands, and to explore the psychological changes associated with fatigue. The research also explored links between fatigue and stress in terms of their affective reactions and the coping mechanisms which are central to them. The first phase of the research consisted of a series of simulated studies of fatigue. The first study developed an experimental paradigm to examine both task-specific and aftereffects of fatigue on driving performance. The findings showed that fatigue effects interacted with task demands such that drivers' lateral control of the vehicle and trajectory were impaired during low demand rather than in high demand driving episodes. The study also showed that the fatigue state is a multidimensional state which is principally characterised by a reduction in motivation. The second and third studies attempted to explore the role of motivational mechanisms in fatigue-related impairments. This phase of the research showed that impairments in low demand driving conditions may be reduced by enhancing the driver's motivational state. The fourth study explored the development of subjective fatigue in two types of task-induced fatigue. The study showed that there is a dissociation between subjective and objective fatigue. The second phase of the research examined the links between stress and fatigue in simulated and real-life driving environments. The studies showed that stress and fatigue are similar states but there are particular features which make them distinct states. The results from simulated and real-life driving environments showed a high degree of consistency.

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Holmberg, Erik. „Stress and fatigue constrained topology optimization“. Licentiate thesis, Linköpings universitet, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-88094.

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This thesis concerns structural optimization in conceptual design stages, for which constraints that are adapted to industrial requirements have been developed for topology optimization problems. The objective of the project has been to identify and solve problems that today prevent structural optimization from being used in a broader sense in the avionic industry; the main focus has been on stress and fatigue constraints in topology optimization. The thesis consists of two parts. The rst part gives an introduction to topology optimization and describes the developed methods for stress and fatigue constraints. In the second part, two papers are included, where the stress and fatigue constraints are evaluated, respectively. In the rst paper, a clustered approach is presented, where stress constraints are applied to stress clusters, rather than points on the structure. This allows for a trade-o between computational time and accuracy, as the number of clusters and thus constraints can be varied. Dierent approaches for how to sort stress evaluation points into clusters and how to update the clusters, such that the results are suciently accurate for conceptual designs, are developed and evaluated. The two-dimensional examples conrm the theoretical discussions and the designs that are obtained have managed to avoid large stress concentrations, even for problems with an initial stress singularity. Compared to the traditional stiness based designs, the stress constrained designs are considered to be closer to a nal design, which will decrease the total product development time. The second paper uses the methodology developed in the rst paper and applies it to high-cycle fatigue constraints. Using loads described by a variable load spectrum and material data from fatigue tests, the tensile principal stresses are constrained by a limit that is determined such that fatigue failure will not occur. In the examples, where the mass is minimized subjected to fatigue and static stress constraints, simple topologies are obtained and the structural parts are sized with respect to the critical fatigue stress and the yield limit. Stress concentrations are again avoided, for example by the creation of a radius around an internal corner. A comparison between static stress constraints based on the von Mises criterion and the highest tensile principal stresses is given and the examples clearly show the characteristics of the two formulations.

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Chahardehi, Amir Ebrahim. „Fatigue Crack Growth in Complex Stress Fields“. Thesis, Cranfield University, 2008. http://hdl.handle.net/1826/3481.

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Fatigue crack growth has been traditionally modelled using LEFM through the use of the Paris law. This requires an accurate method for stress intensity factor (K) calculation. Weight functions have been developed for one-dimensional cracks (e.g. edge and through cracks); these are functions that enable separation of the loading and geometry and considering the effect of each one of these two factors on the stress intensity factor (SIF) separately. They have been proven to be useful for arbitrary stress distributions where an accurate empirical formula for the stress intensity factor does not exist. Such cases include residual stress fields due to surface treatments or welds. However, in the case of surface cracks, or part-through cracks, the problem of modelling the growth of these cracks poses two main questions, namely, how should the Paris law be generalised to suit the two-dimensional scenario, and under arbitrary loadings, how can the SIFs be calculated for these cracks. Current solutions involve tedious mathematical calculations and are complicated functions. In this thesis, the concept of root mean square (RMS) SIF is examined and by drawing mathematical analogy with the one-dimensional case, a novel weight function is derived which enables calculation of RMS SIF values for a range of semi-elliptical surface cracks under arbitrary loadings. The accuracy of the weight function is verified through comparisons with finite elements results for a variety of loadings/geometries. The simplicity of the weight function construction method makes it a useful tool for fatigue life predictions where incremental recalculations of SIF is required as the crack grows. Surface treatments such as shot peening and laser peening are used for crack growth retardation. It is generally believed that it is through the introduction of what is termed ‘beneficiary compressive residual stresses’ that crack retardation occurs. The compressive residual stresses are superimposed on the ‘detrimental tensile stresses’ due to loading and hence lead to a lower SIF level. By having such a strong tool as weight functions, this general belief can be put to test. To this end, a set of experiments were carried out to study the behaviour of cracks in residual stress fields arising from laser peening. Edge cracks were grown in partially-peened specimens. Neutron diffraction stress measurements were taken and stress profiles were obtained for these specimens. Measurements of strain fields near the crack show the interaction between the crack and the stress field induced by the peening process. The effect of laser peening on crack growth is discussed and recommendations for future work are proposed. Overall the thesis proposes a weight function for surface cracks the uniqueness of which is in its simplicity, and develops an understanding of the nature of induced and transient stresses in laser-peened components. The concept of ‘effective fatigue stress’ is introduced and its calculation is described, and conclusions are drawn from the nature of this stress distribution.

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Johansson, Frida, und Rebecka Karlsson. „Compassion Fatigue : En litteraturöversikt om compassion fatigue hos sjuksköterskor inom akutsjukvård“. Thesis, Högskolan i Skövde, Institutionen för hälsa och lärande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-16804.

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Bakgrund: Det råder idag ett högt tempo inom akutsjukvård och sjuksköterskan förväntas vara mångkunnig genom göra snabba bedömningar, möta patienters lidande samt prioritera akuta patienter i en stressig arbetsmiljö. Att ständigt arbeta i en påfrestande arbetsmiljö med lidande patienter och ett högt arbetstempo kan bidra till att sjuksköterskan utvecklar compassion fatigue vilket innebär att empatiförmågan avtar. Syfte: Att belysa faktorer som orsakar compassion fatigue hos sjuksköterskor inom akutsjukvård. Metod: En litteraturöversikt bestående av 11 vetenskapliga artiklar med kvantitativ forskningsmetodik. Artikelsökning utfördes i databaserna CINAHL, MEDLINE, PubMed samt WorldCat Discovery. Resultat: Tre huvudteman kunde utläsas genom analys vilket var demografiska faktorer, arbetsrelaterade faktorer samt psykosociala faktorer. Demografiska faktorer som kunde orsaka compassion fatigue var ålder, kön och civilstånd. Arbetsrelaterade faktorer var arbetsmiljö som bestod av minskat socialt stöd från chefer och kollegor, hög arbetsbelastning, minskad teamkänsla samt yrkesrelaterade faktorer som bestod av utbildningsnivå, yrkeserfarenhet och arbetstider. De psykosociala faktorerna som uppdagades var stressorer, patienters lidande och trauman. Konklusion: Compassion fatigue behöver uppmärksammas och prioriteras både individuellt, kollegialt samt på chefsnivå inom hälso- och sjukvård. Det uppdagades även att fokus på att skapa compassion satisfaction förebygger uppkomsten av compassion fatigue vilket är relevant att anamma inom personalutveckling.
Background: There´s a high speed in the emergency care and the expectation of the nurse seems to be versatile with quick assessment, confront the patients suffering and to prioritize the most acute patient in a stressful work environment. Untenable work environment with suffering patients and a high work speed for the nurse can developed compassion fatigue which means a lost of the ability to feel empathy. Purpose: To illustrate factors that causes compassion fatigue for nurses in emergency care. Method: A literature review consisting of 11 scientific articles with quantitative research. The search of the articles was performed in the databases CINAHL, MEDLINE, PubMed and WorldCat Discovery. Result: Three head themes was seen with analysis which was demographic factors, work relatable and psychosocial factors. Demographic factors which could cause compassion fatigue was age, gender and civil state. Work relatable factors was work environment which consisted less social support from managers and colleges, high workload, less team spirit and work relatable factors which consisted level of education, work experience and working hours. The psychosocial factors that was observed was stressors, patients suffering and trauma. Conclusion: Compassion fatigue needs to been seen and prioritize by individuals, colleges and managers in the healthcare. It was discovered that focus should be to create compassion satisfaction which prevent the appearance of compassion fatigue, which is relevant to embrace in staff development.

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Hattingh, Daniel Gerhardus. „The fatigue properties of spring steel“. Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/2300.

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The nature and scope of this thesis can be divided into three categories, namely stress distribution modelling in coil springs; fatigue and failure analysis, an investigation into measurement of residual stresses and the relation to fatigue life. The operation of springs is directly concerned with the theories of torsion and bending which makes the better understanding of these theories essential. The first part of the thesis is involved with a mathematical evaluation of these theories and a case study of an isolated loop of a coil spring. The mathematical modelling is verified by measuring the strain levels in a coil spring with the aid of strain gauges located at different positions in the coil spring. This evaluation gave a better understanding of the operational stress distribution for input into the two methods currently used by industry for the fatigue testing, namely isolated loop and complete coil spring samples. The remaining part of the thesis revolves around the understanding of the relationship between fatigue life, process effects and residual stresses. The relationship between fatigue failures and process effects was investigated to reveal the mechanism responsible for component fatigue failure in a 55Cr3 automotive suspension spring steel. This was done by subjecting coil springs, withdrawn from different stages of the manufacturing process, to fatigue tests, ensuring that all possible sources of fatigue initiation in this material batch have been identified, including those not dominant in the finished component. Failures prior to shot peen process was mainly surface relate as where those withdrawn after this process were subsurface (inclusions) related. Fractographic analysis, using an XL30 scanning electron microscope, has revealed a number of sources of initiation, which are largely related to mechanical damage and inherent material defects. The results indicate that decreasing defect levels in the material would represent a valid method for enhancing the fatigue response, specifically levels of nonmetallic inclusions and surface mechanical damage, but also that certain manufacturing process stages (cold scragg) are responsible for drop in fatigue life.

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Barsoum, Zuheir. „Residual stress analysis and fatigue of welded structures /“. Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3872.

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Ackley, Jessica Lee. „Compassion Fatigue and Secondary Traumatic Stress in Nurses“. Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/318839.

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Bücher zum Thema "Fatigue stress"

Lieurade, H. P. Fatigue & stress. Gournay-sur-Marne, France: IITT-International, 1989.

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Battle fatigue. Nashville, Tenn: Broadman & Holman, 1995.

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Kirsten, Kite, Hrsg. Flight stress: Stress, fatigue, and performance in aviation. Aldershot, Hants, England: Avebury Aviation, 1994.

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Stokes, Alan. Flight stress: Stress, fatigue and performance in aviation. Aldershot: Ashgate, 1994.

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M, Birkner Katherine, Hrsg. Chronic emotional fatigue. San Antonio, Tex: Pain & Stress Therapy Center Publications, 1992.

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Webster, S. E. Fatigue, corrosion fatigue and stress corrosion of steels for offshore structures. Luxembourg: Commission of the European Communities, 1985.

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Fracture and fatigue emanating from stress concentrators. Dordrecht: Kluwer Academic·, 2002.

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Bauman, Judson T. Fatigue, Stress, and Strain of Rubber Components. München: Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446433403.

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Pluvinage, Guy. Fracture and fatigue emanating from stress concentrators. Dordrecht: Kluwer Academic publishers, 2010.

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Heslegrave, Ronald James. Gestion de la fatigue: Guide à l'intention des gestionnaires, des officers et des membres d'équipage de la Garde côtière canadienne. Ottawa, Ont: Garde côtière canadienne, 1999.

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Buchteile zum Thema "Fatigue stress"

Pelleg, Joshua. „Cyclic Stress – Fatigue“. In Mechanical Properties of Materials, 339–447. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4342-7_6.

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Pelleg, Joshua. „Cyclic Stress: Fatigue“. In Mechanical Properties of Ceramics, 531–616. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04492-7_7.

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Arnetz, Bengt B., und Rolf Ekman. „Fatigue and Recovery“. In Stress in Health and Disease, 280–91. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527609156.ch16.

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Bauman, Judson T. „Fatigue Testing“. In Fatigue, Stress, and Strain of Rubber Components, 117–26. München: Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446433403.008.

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Milella, Pietro Paolo. „Stress-Based Fatigue Analysis High Cycle Fatigue“. In Fatigue and Corrosion in Metals, 245–308. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2336-9_5.

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Gdoutos, E. E. „Stress Intensity Factors for a Linear Stress Distribution“. In Problems of Fracture Mechanics and Fatigue, 53–56. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_12.

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Bauman, Judson T. „Fatigue Life Estimation“. In Fatigue, Stress, and Strain of Rubber Components, 135–41. München: Carl Hanser Verlag GmbH & Co. KG, 2008. http://dx.doi.org/10.3139/9783446433403.010.

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Skelton, R. P. „Cyclic Stress-Strain Properties During High Strain Fatigue“. In High Temperature Fatigue, 27–112. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3453-5_2.

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Murakami, Yukitaka. „Stress Concentration“. In Metal Fatigue, 11–24. Elsevier, 2002. http://dx.doi.org/10.1016/b978-008044064-4/50002-5.

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Zahavi, Eliahu, und Vladimir Torbilo. „Stress Method“. In Fatigue Design, 41–98. CRC Press, 2019. http://dx.doi.org/10.1201/9780203756133-3.

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Konferenzberichte zum Thema "Fatigue stress"

Dowling, Norman E. „Mean Stress Effects in Stress-Life and Strain-Life Fatigue“. In Second SAE Brasil International Conference on Fatigue. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-2227.

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Mönig, R. „Thermal Fatigue in Copper Interconnects“. In STRESS-INDUCED PHENOMENA IN METALLIZATION: Eighth International Workshop on Stress-Induced Phenomena in Metallization. AIP, 2006. http://dx.doi.org/10.1063/1.2173544.

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Eve, S. „Biaxial Fatigue Testing of Thin Films“. In STRESS-INDUCED PHENOMENA IN METALLIZATION: Eighth International Workshop on Stress-Induced Phenomena in Metallization. AIP, 2006. http://dx.doi.org/10.1063/1.2173536.

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Goldstein, Igor Fillippe, und Lucia Vilela Leite Filgueiras. „Truck drivers' fatigue and stress“. In IHC '19: XVIII Brazilian Symposium on Human Factors in Computing Systems. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3357155.3360485.

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Zietek, Grazyna. „Energy Accumulation under Biaxial Cyclic Stress State for Materials with Athermal Martensitic Transformation“. In SAE Brasil International Conference on Fatigue. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-4056.

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Rogers, S. A. „Fatigue Cracking Of Cooling Water Pipes“. In Stress and Vibration: Recent Developments in Measurement and Analysis, herausgegeben von Peter Stanley. SPIE, 1989. http://dx.doi.org/10.1117/12.952912.

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Fei, Guan, und Chen Ping. „Stress Analysis and Fatigue Life Prediction“. In Passenger Car Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1986. http://dx.doi.org/10.4271/861395.

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Siqueira, Célio P., Celso P. M. Pereira, Marcelino P. Nascimento, Herman J. C. Voorwald und Renato C. Souza. „Effects of Nitriding and Shot Peening treatments and Stress Concentration on the Fatigue Strength of AISI 4340 steel“. In SAE Brasil International Conference on Fatigue. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-4070.

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Hattori, T., und M. Yamashita. „Fatigue Strength Evaluation Methods Using Stress Distributions“. In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40114.

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The stress and displacement fields near the bonding edge, sharp notch, and contact edge show singularity behaviors, so methods of evaluating the strength of these points using maximum stresses calculated by a numerical stress analysis, such as the finite element method, are generally not valid. We have previously presented a new method of evaluating the strength of these singular points using two stress singularity parameters H and λ and developed a method of formulating critical stress-singularity parameter Hth for each order of stress singularity λ by utilizing critical distance stress theories (point method and line method), which can be derived from two typical strength parameters, namely, fatigue limit σw0 and threshold stress-intensity factor range ΔKth. These estimated critical Hth (λ) value agreed well with the experimentally measured value. Using these simple critical distance stress approach we estimated the fatigue strength of general stress concentration structures such as, round hole, elliptical hole, V notch and contact edge structures. Then these critical distance stress approaches are applied to estimate the size effects of structures. And the eligibility of these estimated results are confirmed by comparing these estimated results with the experimental results. Finally these estimated results and experimental results are compared with the estimated results by other researchers such as, Neuber, Siebel, Ishibashi and Heywood. And we can confirm the superiority of this critical distance stress approach.

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Xu, Biqiang, Yanyao Jiang und Shenghong Yang. „Stress and Fatigue Analyses of Notched Shafts“. In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-0370.

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Berichte der Organisationen zum Thema "Fatigue stress"

Klopcic, J. T. The Aura Fatigue and Heat Stress Algorithms. Fort Belvoir, VA: Defense Technical Information Center, Dezember 1989. http://dx.doi.org/10.21236/ada216968.

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Lee, E. U., C. Lei, H. C. Sanders und R. Taylor. Evolution of Fractograph During Fatigue and Stress Corrosion Cracking. Fort Belvoir, VA: Defense Technical Information Center, Februar 2004. http://dx.doi.org/10.21236/ada420467.

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Wang, Yuanqing, Haoyang Gu, Xiaowei Liao, Tianshen Zhang und Liang Zong. STUDY ON LOW-TEMPERATURE FATIGUE OF STEEL STRUCTURES AND FATIGUE PROPERTIES OF WELDS UNDER SHEARS STRESS. The Hong Kong Institute of Steel Construction, Dezember 2018. http://dx.doi.org/10.18057/icass2018.p.055.

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Underwood, J. H., und A. P. Parker. Fatigue Life Assessment of Steel Pressure Vessels with Varying Stress Concentration, Residual Stress, and Initial Cracks. Fort Belvoir, VA: Defense Technical Information Center, Juli 1996. http://dx.doi.org/10.21236/ada317116.

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Brausch, John C., und Noel A. Tracy. Effects of Compressive Stress on Fluorescent Penetrant Indications of Fatigue Cracks in Titanium. Fort Belvoir, VA: Defense Technical Information Center, März 2001. http://dx.doi.org/10.21236/ada404873.

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Almer, J. D., J. B. Cohen, K. R. McCallum und R. A. Winholtz. X-Ray Diffraction and Finite Element Study of Residual Stress Effects on Fatigue Crack Growth. Fort Belvoir, VA: Defense Technical Information Center, Mai 1997. http://dx.doi.org/10.21236/ada326227.

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Champoux, R. L., J. H. Underwood und J. A. Kapp. Overview of ASTM Symposium on Analytical and Experimental Methods for Residual Stress Effects in Fatigue. Fort Belvoir, VA: Defense Technical Information Center, Februar 1989. http://dx.doi.org/10.21236/ada205622.

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Miller, James C., Douglas R. Eddy und Joseph Fischer. The Sensitivity and Specificity of Oculometrics Under Fatigue Stress Compared to Performance and Subjective Measures. Fort Belvoir, VA: Defense Technical Information Center, Mai 2004. http://dx.doi.org/10.21236/ada425455.

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Parker, Anthony P., und John H. Underwood. Influence of the Bauschinger Effect on Residual Stress and Fatigue Lifetimes in Autofrettaged Thick-Walled Cylinders. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada330071.

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Kimmel, Donald B. Factors in Risk Prediction and Healing of Stress Fractures and Fatigue Damage in the Female Skeleton. Fort Belvoir, VA: Defense Technical Information Center, November 1998. http://dx.doi.org/10.21236/ada364081.

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