Tesis sobre el tema "Critical stress intensity factor"
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Alkoles, Omar M. S. "Mechanical behaviour and fracture toughness of unfilled and short fibre filled polypropylene both drawn and undrawn. Experimental investigation the effect of fibre content and draw ratio on the mechanical properties of unfilled and short glass fibre filled polypropylene". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5510.
Texto completoAlkoles, Omar M. "Mechanical behaviour and fracture toughness of unfilled and short fibre filled polypropylene both drawn and undrawn : experimental investigation of the effect of fibre content and draw ratio on the mechanical properties of unfilled and short glass fibre filled polypropylene". Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5510.
Texto completoLammens, Bastien. "Caractérisation de la décohésion dynamique des matériaux composites à matrice organique (CMO)". Electronic Thesis or Diss., Ecole centrale de Nantes, 2024. http://www.theses.fr/2024ECDN0007.
Texto completoOrganic matrix laminated composites are increasingly used in the aeronautical field to reduce the weight of structures. However, during an impact on this type of material, various damage mechanism can occur, such as delamination. This is a process of macroscopic decohesion of the interlaminar environment, which can be characterised by GIC (or KIC ). The literature shows a wide disparity in measurements due to incomplete decoupling of the effects of resin confinement by fibers, nonlinearitiesbehaviour and/or velocity effects. This work proposes to develop an experimental protocol to characterise pure resin usingfullfields measurements to methodically study these couplings. The goal is to evaluate the impact of the crack propagation speed and the structural effects on the fracture behaviour and in particular to extend Griffith's theory to laminated composites. Different specimen geometries are used to reproduce structural effects. Crack propagation speeds ranging from quasi-static to dynamic are studied and all the tests are analysed using linear elastic fracture mechanics and the fracture surfaces. Finally, this work proposes a model to describe the evolution of KIC for the resin HexplyM21 used in aeronautics field, from the non-singularterms of the stress field T-stress, B-stress and also the speed ȧ in the ranges [0 - 15] MPa, [- 200 - 10] MPa.m-0.5 et [10-6, 600] m.s-1 respectively
Keller, Scott. "Stress Intensity Factor Dependence of HG-AL Liquid Metal Embrittlement". Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2220.
Texto completoM.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering MSME
Teh, Lay Seong. "Library of geometric influences for stress intensity factor weight functions". Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.566060.
Texto completoArli, Sirisha Divya. "An Investigation on the Stress Intensity Factor of Surface Micro-cracks". Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1495620917553525.
Texto completoFinlayson, Eric F. "Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36504.
Texto completoMaster of Science
Ventura, Antunes Fernando Jorge. "Influence of frequency, stress ratio and stress state on fatigue crack growth in nickel base superalloys at elevated temperature". Thesis, University of Portsmouth, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285929.
Texto completoGarrido, F. A. DiÌaz. "Development of a methodology for thermoelastic investigation of the effective stress intensity factor". Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412241.
Texto completoAzeez, Ahmed. "Effect of dwell time on stress intensity factor of ferritic steel for steam turbine applications". Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148283.
Texto completoDemircivi, Bengi. "Thermal Stress Intensity Factor Evaluation For Inclined Cracks In Functionally Graded Materials Using Jk-integral Method". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607844/index.pdf.
Texto completoGloss, Kevin T. "A Photoelastic Investigation into the Effects of Cracks and Boundary Conditions on Stress Intensity Factors in Bonded Specimens". Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/32786.
Texto completoMaster of Science
Someshwara, Korachar Eshwari. "A Numerical Based Determination of Stress Intensity Factors for Partially Cracked Flexural I-shaped Cross-sections". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89068.
Texto completoMaster of Science
Steel is one of the fundamental materials used in the construction of bridge structures, and steel girder bridges are one of the most common types of bridge structures seen in the United States. Past bridge failures have helped engineers to understand shortcomings in design specifications, and AASHTO codes have been developed and revised over the years to reflect an improved understanding and evolution of engineering behavior. Engineers must make sure that a design is robust enough for functional use of the component during its service life. It is also equally important to understand the potential chances of failure and make the structure strong enough to overcome any failure mechanisms. Fracture is one structural failure mode which occurs with little to no warning and hence is very dangerous. One efficient way to quantify the stress field in the vicinity of a crack tip is by calculating the Stress Intensity Factor (SIF) around a crack tip. Fracture literature is available which describes different methods of determining SIFs for cracked members. However, there are no solutions available to find a SIF of a partially cracked flexural I-shaped members. This research was focused on determining Stress Intensity Factors and studying the fracture behavior of partially cracked I-sections using Finite Element Analysis. The resulting SIF solutions were further used to study the fracture behavior and stress redistribution in partially cracked flexural I-shaped members.
Boussattine, Zaid. "Consequences of the thermal effects generated during fatigue crack growth on the mode one stress intensity factor". Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0047/document.
Texto completoBy subjecting a cracked specimen to a cyclic loading, thermal effects take place and create a heterogeneous temperature field around the crack tip. Those thermal effects are associated with coupling and dissipative heat sources, namely: (i) the heat source due to thermoelastic coupling generated by the hydrostatic part of the stress tensor related to cyclic mechanical loading; (ii) the heat source due to intrinsic dissipation associated with the self-heating phenomena originating from plasticity at the microscopic scale; (iii) and the heat source due to cyclic plasticity, at the macroscopic scale, which occurs in the reverse cyclic plastic zone ahead of the crack tip, and dissipates into heat. The overall heterogeneous temperature field resulting from the heat sources induces a heterogeneous stress field due to thermal expansion phenomena. As a consequence, the stress state over the crack is modified and leads to modify the stress intensity factor, which is a key parameter in modeling fatigue crack growth. Therefore, the aim of this PhD thesis is to quantify the consequences of the heat sources on the stress intensity factor, in the case of a long propagating fatigue crack
Sayar, Mehmet Burak. "Determination Of Stress Intensity Factors In Cracked Panels Reinforced With Riveted Stiffeners". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12614060/index.pdf.
Texto completoPierola, Javier. "Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel". FIU Digital Commons, 1993. http://digitalcommons.fiu.edu/etd/2514.
Texto completoLee, Christopher T. "Critical Heat Stress Evaluation In Two Ebola Ensembles". Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6299.
Texto completoHassan, Tasnim. "NUMERICAL STUDY OF TRANSIENT RESPONSE OF AN INTERFACE-CRACK IN A TWO LAYERED PLATE (ANTI-PLANE, STRESS INTENSITY FACTOR)". Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275474.
Texto completoJagtap, Nimish V. "Application of the Hypersingular Boundary Integral Equation in Evaluating Stress Intensity Factors for 2D Elastostatic Fracture Mechanics Problems". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163788461.
Texto completoRiggenbach, Kane Ryan. "Finite Geometry Correction Factors for the Stress Field and Stress Intensities at Transverse Fillet Welds". Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1339121761.
Texto completoJimenez, Acosta Carlos Efren. "Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/assessment-of-weld-residual-stress-effects-on-fatigue-crack-propagation-in-ferritic-pressure-vessel-steels(ef8f4e14-3b9c-4f45-876b-dca5d5e9c121).html.
Texto completoKecelioglu, Galip. "Stress And Fracture Analysis Of Riveted Joints". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610132/index.pdf.
Texto completo田中, 啓介, Keisuke TANAKA, 義明 秋庭, Yoshiaki AKINIWA, 晶広 高橋, Akihiro TAKAHASHI, 照明 御厨 y Teruaki MIKURIYA. "ねじり - 軸力負荷における鉄鋼薄肉円管試験片における円孔からの疲労き裂の伝ぱ挙動". 日本機械学会, 2003. http://hdl.handle.net/2237/9149.
Texto completoLekesiz, Huseyin. "Stress Intensity Factors and Effective Spring Stiffness for Interfaces with Two and Three Dimensional Cracks at the Interface between Two Dissimilar Materials". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293574318.
Texto completoShi, Zhijun. "Predicting fatigue crack growth life in integral metallic skin-stringer panels". Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7281.
Texto completoKose, Ayse. "Thermal Stress Problem For An Fgm Strip Containing Periodic Cracks". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615697/index.pdf.
Texto completos modulus and thermal conductivity are assumed to be varying exponentially across the thickness, whereas Poisson ratio and thermal diffusivity are taken as constant. First, one dimensional transient and steady state conduction problems are solved (heat flux being across the thickness) to determine the temperature distribution and the thermal stresses in a crack free layer. Then, the thermal stress distributions at the locations of the cracks are applied as crack surface tractions in the elasticity problem to find the stress intensity factors. By defining an appropriate auxiliary variable, elasticity problem is reduced to a singular integral equation, which is solved numerically. The influence of such parameters as the grading, crack length and crack period on the stress intensity factors is investigated.
Ščotka, Martin. "Vliv koncentrace napětí ve vrubu na napjatost a deformaci na čele trhlin zatížených ve smykových zátěžných módech". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318836.
Texto completoFletcher, Oclla Michele. "Critical Heat Stress Evaluation of Two-Layer Clothing Ensembles and the Contributionof a Full-Face Negative Pressure Respirator". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4040.
Texto completoLozano, Minguez Estivaliz. "Fatigue and fracture mechanics of offshore wind turbine support structures". Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9756.
Texto completoVoskoboinikov, Roman E. "Analytical Description of Brittle-to-Ductile Transition in bcc Metals. Nucleation of dislocation loop at the crack tip". Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29522.
Texto completoAtay, Mehmet Tarik. "Fracture Of A Three Layer Elastic Panel". Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606360/index.pdf.
Texto completoHinneh, Perry. "The Finite Block Method : a meshless study of interface cracks in bi-materials". Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/39754.
Texto completoVoskoboinikov, Roman E. "Analytical Description of Brittle-to-Ductile Transition in bcc Metals. Nucleation of dislocation loop at the crack tip". Forschungszentrum Rossendorf, 2002. https://hzdr.qucosa.de/id/qucosa%3A21779.
Texto completoBhamare, Sagar D. "Determination of Optimal Material Combination for Multilayer Thin Films to Improve Performance against surface Crack Propagation". University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258479408.
Texto completoKarlsson, David. "Analysis of Three-Dimensional Cracks in Submodels". Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8105.
Texto completoA common technique to evaluate load paths in complex structures is to perform FE-calculations with relative large elements. This procedure gives no information regarding stress concentrations at e.g. holes or radius but this phenomenon can later on be investigated in details with local individual submodels. Displacements is taken from the global model and used to analyse stress concentrations and crack driving parameters in the submodel.
Today, the crack controlling stress intensity factors are in general cases obtained from handbook solutions of elementary cases. This method requires engineering judgements in a conservative manner and one way to improve the solution is to model the crack in its correct surroundings in a local three-dimensional submodel.
This master thesis is focused on the development of an automated support for analysing three-dimensional cracks in submodels. The results from a global Nastran model can be imported to Trinitas and used for a more accurate stress and fatigue life analysis in a local model. Here a three-dimensional crack tip subdomain can be generated inside an eight point brick volume. The crack tip subdomain is specially designed and adjusted for accurate determination of stress intensity factors along the crack front. For example, all points are adjusted with respect to the brick volume and the crack size, triangular wedge elements are applied around the crack tip, the midpoints for these elements are moved to quarter points and the crack front is curved. The crack tip subdomain is validated against several reference cases and shows sufficiently good results with respect to the stress intensity factor.
Finally, the automated crack tip subdomain generation is applied to a geometrically complex part of a main wing carry-through bulkhead of a fighter aircraft in order to show the applicability of the procedure in an industrial environment.
Yilmaz, Engin. "Cracked Elastic Annulus Bonded To Rigid Cylinder". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606782/index.pdf.
Texto completoErozkan, Deniz. "Finite Strip With Rigid Ends And Edge Notches". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610880/index.pdf.
Texto completo#8211
a. Two ends of the finite strip are bonded to two rigid plates through which uniformly distributed axial tensile loads of intensity p0 are applied. The finite strip is assumed to be made of a linearly elastic and isotropic material. For the solution of the finite strip problem, an infinite strip of width 2h containing two internal cracks of width b&
#8211
a at y=0 and two rigid inclusions of width 2c at y=±
L is considered. When the width of rigid inclusions approach the width of the strip, the portion of the infinite strip between the inclusions becomes identical with the finite strip problem. When the outer edges of the internal cracks approach the edge of the strip, they become edge cracks (notches). Governing equations are solved by using Fourier transform technique and these equations are reduced to a system of three singular integral equations. By using Gauss-Lobatto and Gauss-Jacobi integration formulas, these three singular integral equations are converted to a system of linear algebraic equations which is solved numerically.
Durucan, Ayse Rusen. "Axisymmetric Finite Cylinder With Rigid Ends And A Circumferential Edge Crack". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612287/index.pdf.
Texto completoL planes. General expressions of the infinite cylinder problem are obtained by solving Navier equations with Fourier and Hankel transforms. This infinite cylinder problem is then converted to the target problem by letting the radius of the rigid inclusions approach the radius of the cylinder and letting the outer edge of the crack approach the surface of the cylinder. Consequently, these rigid inclusions form the rigid ends and internal crack form the circumferential edge crack resulting in the problem of a finite cylinder with rigid ends having an edge crack. The problem is reduced to a set of three singular integral equations. These singular integral equations are converted to a system of linear algebraic equations with the aid of Gauss-Lobatto and Gauss-Jacobi integration formulas and are solved numerically.
Louvros, Dimitrios. "Investigation of the reliability deterioration of ageing marine structures". Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8470.
Texto completoŠevčík, Martin. "Výpočtové modelování deformačně-napěťových stavů čelního soukolí pomocí MKP". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227992.
Texto completoŠeveček, Oldřich. "Solution of General Stress Concentrators in Anisotropic Media by Combination of FEM and the Complex Potential Theory". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233837.
Texto completoLeon, Armando. "Non-Linear Vibration and Dynamic Fracture Mechanics of Bridge Cables". Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00488.
Texto completoLic March 2011
Afshar, Hosseinabadi Reza. "Stress analysis of periodic notches by using the strain energy density approach". Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423526.
Texto completoQuesta ricerca si concentra su "Analisi delle sollecitazioni di intagliati periodici utilizzando l'approccio di densità di energia di deformazione", si è occupato di problematiche relative alla modellazione bidimensionale e tridimensionale di intagli periodici raccordati e a spigolo vivo. Bulloni, viti e connessioni rotanti spalle, come esempi di componenti intagliati periodiche, svolgono un ruolo importante nelle performance delle macchine. L'attività ha coinvolto prevalentemente la modellazione numerica in campo elastico ed ha permesso di ottenere delle semplici espressioni per la stima dei fattori d’intensificazione delle tensioni (NSIFs) e dei fattori teorici di concentrazione delle tensioni (SCFs) in funzione di tutti i parametri geometrici considerati. Le analisi numeriche sono state effettuate in prima battuta con mesh fitte e successivamente con mesh molto rade. Nel secondo caso l’energia di deformazione mediata in un volume di controllo ha permesso di determinare con precisione i fattori tensionali di riferimento e alcune espressioni per l’applicazione diretta a problematiche simili. Nel caso tridimensionale sono stati studiati e analizzati gli effetti legati allo spessore con particolare riferimento ai modi accoppiati che vengono automaticamente generati per effetto Poisson e che possono incidere in modo rilevante sull’integrità strutturale di componenti meccanici. I risultati raggiunti sono stati applicati a casi aziendali con due collaborazioni tutt’ora in atto con Officine Meccaniche Zanetti e Omera formalizzate in progetti di ricerca in cui il dottorando è stato il principale protagonista.
Brabenec, Ladislav. "Topologicko-geometrický návrh a deformačně-napjatostní analýza tvaru disku železničního kola pro různé provozní podmínky na základě analýz LELM". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229933.
Texto completoYilmaz, Suphi. "Buckling Driven Delamination Of Orthotropic Functionally Graded Materials". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607836/index.pdf.
Texto completos technology severe working conditions increase demands on structural materials. A class of materials which are developed to meet these increased demands is Functionally Graded Materials (FGMs). These are inhomogeneous structural materials which are able to withstand large temperature gradients and corrosive environment. Application areas of FGMs are in aerospace industry, nuclear reactors, chemical plants and turbine systems. FGMs have gradual compositional variation from metal to ceramic which give them mechanical strength, toughness and heat resistance. However under high temperature gradients, cracking problems may arise due to thermal stresses. In layered structures the final stage of failure may be delamination due to crack extension. The objective of this study is to model a particular type of crack problem in a layered structure consisting of a substrate, a bond coat and an orthotropic FGM coating. There is an internal crack in the orthotropic layer and it is perpendicular to material gradation of coating. The position of the crack inside the coating is kept as a variable. The steady-state temperature distribution between the substrate and the coating causes a buckled shape along crack face. The critical temperature change, temperature distribution, mixed mode stress intensity values and energy release rates are calculated by using Displacement Correlation Technique. Results of this study present the effects of geometric parameters such as crack length, crack position, etc as well as the effects of the type of gradation on buckling behavior and mixed mode stress intensity factors.
Cetin, Suat. "Analytical Solution Of A Crack Problem In A Radially Graded Fgm". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12609120/index.pdf.
Texto completo(unal), Kutlu Ozge. "Computational 3d Fracture Analysis In Axisymmetric Media". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609872/index.pdf.
Texto completos radius to thickness ratio (R/t), the crack geometry ratio (a/c) and crack minor axis to cylinder thickness ratio (a/t) on stress intensity factors for surface and internal cracks are examined. Mechanical and thermal loading cases are considered. Displacement Correlation Technique (DCT) is used to obtain Stress Intensity Factors.
Het, Kivanc. "Effects Of Geometrical Factors On Fracture Toughness Using Semi-circular Bending Type Specimens". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609320/index.pdf.
Texto completolbasi andesite was found as 1.36 MPa .
來海, 博央, Hirohisa KIMACHI, 拓. 田中, Hiroshi TANAKA, 啓介 田中, Keisuke TANAKA, 康一 吉田 y Koichi YOSHIDA. "長繊維強化プラスチックスにおける巨視的モードⅠ負荷を受ける層間き裂の進展経路". 日本機械学会, 2000. http://hdl.handle.net/2237/9168.
Texto completoŠeveček, Oldřich. "Řešení obecných koncentrátorů napětí v anisotropních prostředích pomocí kombinace MKP a teorie komplexních potenciálů". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233849.
Texto completo