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Thematische Bibliographien / Brittle behaviour

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Auswahl der wissenschaftlichen Literatur zum Thema „Brittle behaviour“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 21. Februar 2023

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Zeitschriftenartikel zum Thema "Brittle behaviour"

1

Banerjee, Rajat, und Bikas K. Chakrabarti. „Critical fatigue behaviour in brittle glasses“. Bulletin of Materials Science 24, Nr. 2 (April 2001): 161–64. http://dx.doi.org/10.1007/bf02710094.

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2

Vallet, D., und J. C. Charmet. „Mechanical behaviour of brittle cement grains“. Journal of Materials Science 30, Nr. 11 (Juni 1995): 2962–67. http://dx.doi.org/10.1007/bf00349670.

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3

Dlouhý, Ivo, Zdeněk Chlup und Aldo Roberto Boccaccini. „Fracture Behaviour of Brittle (Glass) Matrix Composites“. Materials Science Forum 482 (April 2005): 115–22. http://dx.doi.org/10.4028/www.scientific.net/msf.482.115.

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A number of examples exist that indicate the potential for increasing the toughness of brittle matrices by dispersing different reinforcements. For further development of these advanced materials the actual material response during mechanical loading under presence of flaws appears to be important. Theoretical and experimental knowledge acquired on different kinds of brittle matrix composites is summarised in the paper. These include glass matrix composites with metallic particles, alumina platelets, continuous SiC (Nicalon®) fibres, and both chopped fibres and ZrO2particles (hybrid composites). The composites were tested in as-received state but also after different forms of thermomechanical loading, e.g. thermal shock, thermal cycling in air, which were investigated according to the envisaged composites application. Chevron notch technique was mainly used for fracture toughness evaluation. Microstructural damage is explained based on identified fracture micromechanisms.

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4

Xiao, Xiaolan, Jiayun Deng, Qiang Xiong, Qiusheng Yan, Zhengtao Wu und Huatay Lin. „Scratch Behaviour of Bulk Silicon Nitride Ceramics“. Micromachines 12, Nr. 6 (16.06.2021): 707. http://dx.doi.org/10.3390/mi12060707.

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Si3N4 ceramic is generally recognized as being difficult to machine due to its hardness and brittleness. It is necessary to control the normal load applied and the machined depth of the abrasive particles in order to eliminate surface/subsurface damage and defects during the grinding or polishing. In this study, scratch experiments were conducted on the polished surface of Si3N4 specimens to investigate the brittle–ductile transformation and the evolution of material removal mechanisms. In addition, the cracking behaviour of Si3N4 ceramic was characterized by indentation tests. The Vickers indentation produced cracks that exhibited good developmental integrity and geometric symmetry. The results indicate that the scratch track can be divided into three stages: the ductile regime, the brittle–ductile coexisting stage, and the brittle fracture regime. The critical loads and the corresponding penetration depths of cracking occurrence in Si3N4 were recorded. The material removal of Si3N4 ceramic was primary attributed to ductile regime removal when the load was less than 9.8 N. Microcrack initiation on the subsurface was observed when the penetration depth of the scratch tip reached 8 μm or the depth of the indentation tip reached 3.2 μm. Microcracks expanded rapidly as the load was further increased, resulting in a brittle fracture of the Si3N4 ceramic.

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5

Xicheng, Huang, Li Shangkun, Qiang Wei, Chen Gang, Tian Rong und Wang Lixiang. „Numerical Simulation of Crack Initiation and Growth in PBX High Explosive Subject to Compression“. EPJ Web of Conferences 183 (2018): 01019. http://dx.doi.org/10.1051/epjconf/201818301019.

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PBX solid high explosive exhibits brittle behaviour in uniaxial tension, quasi-brittle in uniaxial compression, and ductile when subject to high confining pressure. Tension cracking is the primary failure mode of PBX quasi-brittle solid, which is the main effect leading to overall failure of structural integrity. One characteristics of brittle or quasi-brittle solids, such as PBXs, is that when subject to overall compressive loading, the tensile cracks can still initiate inside the material due to existence of imperfection within the materials. In present study the extended finite element method is applied to analyze the cracking failure mechanism in the PBX 9502 platelike specimen with cavity subjected to overall compression. The nonlinear constitutive behaviours and failure of PBX under complex stress states were described by means of stress state dependent strength surface, non-associated flow rule and cohesive model the nonlinear behaviors of PBXs, including failure. Analysis indicates the tensile stress around the cavity arises in the specimen although loaded by overall compression, and this local tensile condition leads to cracking initiation. The comparison between simulation results and the experimental data published by LANL[Liu C, Thompson D G. Crack initiation and growth in PBX 9502 high explosive subject to compression. Journal of Applied Mechanics, 2014, 81(10):212-213] shows that they are in agreement with each other on some aspects of crack behaviours, including overall development of crack history and inflexion, crack initiation moment, crack initial speed, etc.

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6

Maeno, Keiki, Masaki Tanaka, Kenji Higashida, Masahiro Fujikura und Kohsaku Ushioda. „The Brittle-to-Ductile Transition Behaviour in Fe-Al Single Crystalline Alloys“. Advanced Materials Research 409 (November 2011): 243–48. http://dx.doi.org/10.4028/www.scientific.net/amr.409.243.

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The morphology of deformation twinning, which influences a brittle fracture at low temperatures, was investigated in Fe-8mass%Al. Tensile tests were performed at 129K and room temperature. The specimen tested at room temperature showed yielding and kept deformed by usual slip while the specimen tested at 129K fractured in a brittle manner in an elastic regime with a number of straight markings due to deformation twinning. Detail analysis of those deformation twins suggests that the collision of deformation twinning is the initiation site of the brittle fracture.

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7

Traidi, Khalil, Véronique Favier, Philippe Lestriez, Karl Debray, Laurent Langlois und Tudor Balan. „Modelling Semi-Solid Behaviour and Brittle Temperature Range“. Solid State Phenomena 285 (Januar 2019): 361–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.361.

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In this paper, a new elastic viscoplastic micromechanical modelling is proposed to represent the semi-solid behaviour and predict the ductile-brittle transition of the C38LTT near the solidus. It is based on a viscoplastic modelling previously presented in [1]. The originality of the new model comes from three main enhancements: the transition between the solid state and the semi-solid state was included meaning that the material properties were taken temperature-dependent, the elastic properties was taken into account similarly as [2] and the evolution of the internal variable describing the degree of agglomeration of the solid phase was enhanced. The model was implemented in the commercial software FORGE©. Tensile tests representing the experimental thermal conditions and obtained using a GLEEBLE© machine were simulated. The comparison of the predicted and experimental results shows that, for the first time to our knowledge, the three steps of the load-displacement response and ductile-brittle transition were successfully described.

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8

Renshaw, Carl E., und Erland M. Schulson. „Universal behaviour in compressive failure of brittle materials“. Nature 412, Nr. 6850 (August 2001): 897–900. http://dx.doi.org/10.1038/35091045.

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9

Webster, S. E., und P. H. Bateson. „Significance of local brittle zones to structural behaviour“. Materials Science and Technology 9, Nr. 1 (Januar 1993): 83–92. http://dx.doi.org/10.1179/mst.1993.9.1.83.

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10

Sieber, Lars, und Richard Stroetmann. „The brittle fracture behaviour of old mild steels“. Procedia Structural Integrity 5 (2017): 1019–26. http://dx.doi.org/10.1016/j.prostr.2017.07.160.

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Dissertationen zum Thema "Brittle behaviour"

1

Yang, Xiao-Feng. „Aspects of the mechanical behaviour of unidirectional brittle fibre-reinforced brittle matrices“. Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239805.

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Rolo, Reinaldo. „The anisotropic stress-strain-strength behaviour of brittle sediments“. Thesis, Imperial College London, 2004. http://hdl.handle.net/10044/1/8239.

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3

Yu, Qifeng 1977. „Computational simulations of shear behaviour of joints in brittle geomaterials“. Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34003.

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The mechanical behavior of fractures in geological media is important to geotechnical and geoenvironmental engineering. Considerable investigations have been conducted on, firstly, the characterization of the fracture topography and secondly, on the assessment of the influence of fracture topography on the mechanical behavior, particularly the dilatancy of the discontinuity. The studies of the mechanical behavior of fracture surfaces have invariably been concerned with the examination of the mechanics of the contact surfaces, to the virtual exclusion of the progress of failure zones into regions adjacent to the contacting fracture surfaces. This thesis conducts a computational assessment of the role of geomaterial plasticity and surface topography on the behavior of a fracture. The computational modelling takes accounts of the irregularity of the joint surface, the frictional and elasticity characteristics of the contact zones, the elasto-plastic failure of the material and incompatible deformations that arise during shear of an irregular fracture surface. The computational shear responses are compared for the cases where a regular fracture surface exhibits identical shear behavior in the presence of geomaterial plasticity. For an irregular joint, it is observed that the shear behavior is relatively unaffected by material plasticity. Variation of dilatancy with shear cycles, however, can be directly attributed to the presence of material plasticity. Plastic energy dissipation is related to the normal restraints specified. Shear behavior of a specific joint appears to depend mainly on the interfacial behavior of the limited number of asperity contact during shear. The surface geometry of these asperities governs the dilatancy and their slopes control the peak shear resistance. The thesis also examines briefly the influence of initial separation of joints on the shear behavior.

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4

Landschoff, Jannes. „Brooding behaviour in Ophioderma wahlbergii, a shallow-water brittle star from South Africa“. Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13380.

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Includes bibliographical references.
The brooding behaviour and brooded young are described for Ophioderma wahlbergii Müller & Troschel 1842, a large, common brittle star from the coastal waters of South Africa. Twenty specimens were collected each month from June 2013 – May 2014 (n = 240). The species was found to be gonochoric.

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5

Chia, Julian Yan Hon. „A micromechanics-based continuum damage mechanics approach to the mechanical behaviour of brittle matrix composites“. Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/2856/.

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The thesis describes the development of a new continuum damage mechanics (hereafter, CDM) model for the deformation and failure of brittle matrix composites reinforced with continuous fibres. The CDM model is valid over sizes scales large compared to the spacing of the fibres and the dimensions of the damage. The composite is allowed to sustain damage in the form of matrix micro-cracking, shear delamination, tensile delamination and fibre failure. The constitutive equations are developed by decomposing the composite compliance into terms attributable to the fibre and matrix, and modelling the competing failure modes by intersecting failure surfaces based on maximum stress theory. The fibres are treated as being weakly bonded to the matrix so that the fibres only transmit axial loads, and fail in tension. The matrix is modelled as isotropic linear elastic and is treated as transversely-isotropic after damage has initiated. The effect of multiple matrix cracking on the stiffness was determined from experimental data, while failure was modelled by a rapid decay in the load bearing capacity. Although the model is motivated largely to proportional loading, matrix unloading and damage closure has been modelled by damage elasticity. During compression, the matrix stiffness is identical to the undamaged state with the exception that the fibres are assumed not to transmit compressive loads. The model was implemented computationally through a FORTRAN subroutine interfaced with the ABAQUS/Standard finite element solver. The CDM model was validated by comparing experimental and computational results of test specimens with unidirectional and balanced 0°-90° woven fibres of a brittle matrix composite, fabricated from polyester fibres in a polyester matrix. This composite system exhibits low elastic mismatch between fibres and matrix, and has similar non-dimensionalised stress-strain response to a SiC/SiC composite proposed for the exhaust diffuser unit of the Rolls-Royce EJ200 aero-engine.

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6

Rangasamy, Mahendren Sharan Raj. „Thermomechanical behaviour of multi-cracked brittle media taking into account unilateral effects : theoretical and numerical approaches“. Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0070.

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Dans ces travaux de thèse, des approches micromécaniques et numériques sont utilisées pour prédire les propriétés thermiques et thermoélastiques effectives d’un milieu microfissuré. Les développements sont effectués pour les cas bidimensionnel et tridimensionnel. Une attention particulière est portée à l’anisotropie induite par l’orientation des fissures et à l’effet unilatéralassocié à leur ouverture/fermeture. Plus précisément, les fissures sont modélisées comme des inclusions ellipsoïdales, sans rigidité et thermiquement isolantes dans le cas des fissures ouverteset constituées d’un matériau isotrope fictif dans le cas des fissures fermées. L’approche théorique tire profit de différents schémas et bornes obtenues par homogénéisation pour déterminer lesexpressions analytiques des propriétés effectives. Sur le plan numérique, le travail s’appuie sur la modélisation par éléments finis et se base sur les mêmes géométrie et propriétés des fissures quecelles retenues pour la démarche micromécanique. La comparaison des résultats permet de montrer la cohérence entre ces deux approches
Micromechanical and numerical methods are explored to predict the effective thermal and thermoelastic properties of a microcracked media. The effective properties are given in 2D and3D. In this thesis, special attention is paid to the anisotropy, induced by the orientation of the cracks and the unilateral effect related to the opening and closing of the cracks. The cracks aremodelled as ellipsoidal inclusions. The open cracks are considered to have no stiffness and to be thermally insulating, whereas the closed cracks are represented by a fictitious isotropic material.The theoretical approach takes advantage of various homogenization schemes and bounds to derive closed-form expressions of effective properties. The numerical approach considers finiteelement modelling and is based on the same geometry and properties of cracks as in the theory. Finally, results are compared to demonstrate the consistency between the two approaches

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Aboubakr, Attitou Amen Mohamed [Verfasser]. „Behaviour study of grouted connection for offshore wind turbine structures with brittle cement based grouts / Attitou Amen Mohamed Aboubakr“. Kassel : Universitätsbibliothek Kassel, 2020. http://d-nb.info/1208531697/34.

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8

Vadluga, Vaidas. „Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method“. Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281.

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Research area and topicality of the work. Mechanical properties and their evolution under loading are the most significant factors for the development of various mechanical structures, technologies and equipment. It seems to be natu-ral that deeper understanding of the behaviour of existing and design of new materials presents a challenge in different research areas. It should be noted, that all the materials are heterogeneous in meso- and micro- scales. They exhibit essential differences, compared to the macroscopic continuum behaviour. Basically, both experimental and numerical simulation methods are extensively applied for investigation purposes. Experimental techniques, capable of giving a realistic view of the inside of the material and extracting the real data, are very expensive. Therefore, the nu-merical simulation tools are extensively used as an alternative for investigation purposes. They have considerable advantages allowing the reproduction of multiple experiments and providing comprehensive data about ongoing phe-nomena. Recently, numerical technologies have become highly multidisciplinary subjects. They comprise phenomenological and statistical ideas, while mathe-matical models employ the relations of continuum mechanics, classical discre-tization methods and molecular dynamics. The Discrete Element Method (DEM) is one of new methods. It is aimed at simulating the dynamic behaviour of the contacting particles. Variable topology of the system of particles is an... [to full text]
Tyrimų sritis ir darbo aktualumas. Kuriant modernias ��vairios paskirties mechanines sistemas, technologijas ir įrangą, svarbiomis tampa jas sudarančios medžiagos. Savaime suprantama, kad žinomos ir naujai kuriamos medžiagos dabar kur kas išsamiau nagrinėjamos daugelyje mokslo šakų, įskaitant ir me-džiagų mechaniką. Visos medžiagos mezo- ir mikrostruktūros požiūriu yra ne-vienalytės. Jų mikroskopinės savybės skirtingos, lyginant su įprastu kontinuu-mu. Medžiagų savybėms tirti dažniausiai taikomi eksperimentiniai metodai. Eksperimentiniais metodais ištirti medžiagos struktūras ir jose vykstančius procesus ir įvertinti tam tikras jų savybes labai brangu. Tai viena priežasčių, kodėl skaitinis modeliavimas tampa realia tyrimų alternatyva. Skaitinį eksperi-mentą galima kartoti daug kartų, valdant bandinio parametrus, išlaikant tas pa-čias sąlygas, ir stebėti reiškiniui būdingus rodiklius visame tūryje. Šiuolaikiniai modeliavimo metodai yra kompleksiniai. Jie jungia fenome-nologines ir statistines idėjas, o matematiniai modeliai sudaromi taikant konti-nuumo mechanikos ir jų diskrečiųjų modelių bei molekulinės dinamikos pri-klausomybes. Diskrečiųjų elementų metodas (DEM) taip pat priskiriamas šiuo-laikinių metodų kategorijai. Jis skirtas kontaktuojančių dalelių sistemų dinami-niam modeliavimui. Kintanti dalelių sistemos topologija – būdingas metodo požymis. Pastaruoju metu DEM jau taikomas kontinuumui modeliuoti ir praktikoje aktualiems irimo uždaviniams spręsti. Reikia pastebėti... [toliau žr. visą tekstą]

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Brahmachari, Koushik, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty und School of Construction and Building Sciences. „Connection and flexural behaviour of steel RHS filled with high strength concrete“. THESIS_FTA_CBS_BRAHMACHARI_K.xml, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in various structures including frames of high rise buildings, bridges, offshore structures, cast-in-situ piles in foundation etc. Design methods for concrete-filled steel tubular sections are recommended in a number of code of practices. Due to the significant differences in the material properties between normal strength concrete and high strength concrete, there is a need to study the behaviour of composite sections with higher strength concretes. The study emphasises ultimate strength, ductility, post-failure strength reserve and interface bond. It also emphasises ductility and post-failure strength of the composite beams due to the brittle behaviour of higher strength concretes when compared to normal strength concrete. Spreadsheet graph were used to present the results such as load versus strains, load versus deflections etc. In this thesis analytical study is presented on the calculation of ultimate moment of resistance of the concrete-filled RHS beams. Among the main considerations of the derivation, the steel portion was assumed either elastic-perfectly plastic or perfectly plastic and concrete carries no strength in the tensile zone. At the interface both full bond and partial bond were assumed for comparison. Efforts were also made to calculate the midspan deflections of the composite beams. Simple analytical expressions derived from this study can be coded to a prgrammable calculator or in a small spreadsheet program for design use. Finite element studies were carried out by using a proprietorship software package ANSYS. In the analysis of concrete-filled, three types of elements with large deformation and nonlinear capabilities were used. A plastic shell element, a solid concrete element with cracking and crushing capabilities, and a nonlinear spring contact element were used to model the steel shell, the concrete core and the interface respectively.
Doctor of Philosophy (PhD)

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Brahmachari, Koushik. „Connection and flexural behaviour of steel RHS filled with high strength concrete“. Thesis, View thesis, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in various structures including frames of high rise buildings, bridges, offshore structures, cast-in-situ piles in foundation etc. Design methods for concrete-filled steel tubular sections are recommended in a number of code of practices. Due to the significant differences in the material properties between normal strength concrete and high strength concrete, there is a need to study the behaviour of composite sections with higher strength concretes. The study emphasises ultimate strength, ductility, post-failure strength reserve and interface bond. It also emphasises ductility and post-failure strength of the composite beams due to the brittle behaviour of higher strength concretes when compared to normal strength concrete. Spreadsheet graph were used to present the results such as load versus strains, load versus deflections etc. In this thesis analytical study is presented on the calculation of ultimate moment of resistance of the concrete-filled RHS beams. Among the main considerations of the derivation, the steel portion was assumed either elastic-perfectly plastic or perfectly plastic and concrete carries no strength in the tensile zone. At the interface both full bond and partial bond were assumed for comparison. Efforts were also made to calculate the midspan deflections of the composite beams. Simple analytical expressions derived from this study can be coded to a prgrammable calculator or in a small spreadsheet program for design use. Finite element studies were carried out by using a proprietorship software package ANSYS. In the analysis of concrete-filled, three types of elements with large deformation and nonlinear capabilities were used. A plastic shell element, a solid concrete element with cracking and crushing capabilities, and a nonlinear spring contact element were used to model the steel shell, the concrete core and the interface respectively.

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Bücher zum Thema "Brittle behaviour"

1

Mitton, David. A Cow on the line and other Thomas the tank engine stories ; photographs by David Mitton and Terry Permane for Britt Allcroft's production of Thomas the Tank Engine and friends. New York: Random House, 1992.

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2

Kenis, Ilse. Brittle-ductile Deformation Behaviour in the Middle Crust: As Exemplified by Mullions (Former "Boudins") in the High-ardenne Slate Belt, Belgium (Aardkundige Mededelingen). Leuven Univ Pr, 2004.

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3

Tanaka, H. Phase separation in soft matter: the concept of dynamic asymmetry. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198789352.003.0015.

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In this article, we review the basic physics of viscoelastic phase separation including fracture phase separation. We show that with an increase in the ratio of the deformation rate of phase separation to the slowest mechanical relaxation rate the type of phase separation changes from fluid phase separation, to viscoelastic phase separation, to fracture phase separation. We point out that there is a physical analogy of this to the transition of the mechanical fracture behaviour of materials under shear from liquid-type, to ductile, to brittle fracture. This allows us to discuss phase separation and shear-induced instability of disordered materials including soft matter, on the same physical ground. Finally it should be noted that what we are going to describe in this article has not necessarily been firmly established and there still remain many open problems to be studied in the future.

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4

L, Blumberg Selinger Robin, Hrsg. Fracture: Instability dynamics, scaling, and ductile/brittle behavior. Pittsburgh, Pa: Materials Research Society, 1996.

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5

Kim, Kyung-Suk, Michael P. Marder, Glenn E. Beltz und Robin L. Blumberg Selinger. Fracture and Ductile vs. Brittle Behavior Vol. 539: Theory, Modelling and Experiment. University of Cambridge ESOL Examinations, 2014.

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6

T, Read D., und National Institute of Standards and Technology (U.S.), Hrsg. Fracture behavior of a pressure vessel steel in the ductile-to-brittle transition region. [Washington, D.C.]: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989.

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T, Read D., und National Institute of Standards and Technology (U.S.), Hrsg. Fracture behavior of a pressure vessel steel in the ductile-to-brittle transition region. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989.

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8

Bažant, Zdenek P., Jia-Liang Le und Marco Salviato. Quasibrittle Fracture Mechanics and Size Effect. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192846242.001.0001.

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Many modern engineering structures are composed of brittle heterogenous (a.k.a. quasibrittle) materials. These materials include concrete (an archetype), composites, tough ceramics, rocks, cold asphalt mixtures, and many brittle materials at the microscale. Understanding the failure behavior of these materials is of paramount importance for improving the resilience and sustainability of various engineering structures including civil infrastructure, aircraft, ships, military armors, and microelectronic devices. This book provides a comprehensive treatment of quasibrittle fracture mechanics. It first presents a concise but rigorous and complete treatment of the linear elastic fracture mechanics, which is the foundation of all fracture mechanics. The topics covered include energy balance analysis of fracture, analysis of near-tip field and stress intensity factors, Irwin's relationship, J-integral, calculation of compliance function and deflection, and analysis of interfacial crack. Built upon the content of linear elastic fracture mechanics, the book presents various fundamental concepts of nonlinear fracture mechanics, which include estimation of inelastic zone size, cohesive crack model, equivalent linear elastic fracture mechanics model, R-curve, and crack band model. The book also discusses some more advanced concepts such as the effects of the triaxial stress state in the fracture process zone, nonlocal continuum models, and discrete computational model. The significant part of the book is devoted to the discussion of the energetic and statistical size effects, which is a salient feature of quasibrittle fracture. The book also presents probabilistic fracture mechanics, and its consequent reliability-based structural analysis and design of quasibrittle structures. Finally, the book provides an extensive review of various practical applications of quasibrittle fracture mechanics.

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The effect of various metallurgical parameters on the flow and fracture behavior of polycrystalline NiAl near the brittle-to-ductile transition. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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The effect of various metallurgical parameters on the flow and fracture behavior of polycrystalline NiAl near the brittle-to-ductile transition. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Buchteile zum Thema "Brittle behaviour"

1

François, Dominique, André Pineau und André Zaoui. „Brittle Fracture“. In Mechanical Behaviour of Materials, 103–91. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4930-6_3.

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François, Dominique, André Pineau und André Zaoui. „Ductile-Brittle Transition“. In Mechanical Behaviour of Materials, 265–305. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4930-6_5.

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3

Hamelin, P., und P. Matray. „Mechanical Behaviour of Cement Based Composites“. In Brittle Matrix Composites 3, 335–43. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3646-4_36.

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Allix, O., D. Gilletta und P. Ladeveze. „Non Linear Mechanical Behaviour of Laminates“. In Brittle Matrix Composites 1, 227–40. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4319-3_15.

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5

Kasperkiewicz, Janusz, Piet Stroeven und Dik Dalhuisen. „Fracture Behaviour of Plain Concrete in Bending“. In Brittle Matrix Composites 2, 506–15. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2544-1_52.

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6

Laksimi, A., und C. Bathias. „Fracture Mechanics Behaviour of Glass Cloth/Epoxy Composites“. In Brittle Matrix Composites 1, 263–86. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4319-3_17.

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Basista, M. „Micromechanics of Damage in Brittle Solids“. In Anisotropic Behaviour of Damaged Materials, 221–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-36418-4_7.

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Moczko, Andrzej. „The Age Effect in Cracking Behaviour of Plain Concrete“. In Brittle Matrix Composites 3, 240–47. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3646-4_26.

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Turwitt, M., G. Elssner und G. Petzow. „On the Fracture Behaviour of Metal-to-Ceramic Joints“. In Brittle Matrix Composites 1, 169–83. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4319-3_10.

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Lauf, S., und R. F. Pabst. „Fatigue Behaviour of SiSiC Composite Structures at Elevated Temperature“. In Brittle Matrix Composites 1, 151–67. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4319-3_9.

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Konferenzberichte zum Thema "Brittle behaviour"

1

Kuijpers, Jan, Dave Roberts und John Napier. „Modelling of Brittle Pillar Behaviour“. In First Southern Hemisphere International Rock Mechanics Symposium. Australian Centre for Geomechanics, Perth, 2008. http://dx.doi.org/10.36487/acg_repo/808_89.

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Wang, H. Y., J. Shu, Y. L. Bai, M. F. Xia und F. J. Ke. „Catastrophic rupture of heterogeneous brittle materials under impact loading“. In DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. Les Ulis, France: EDP Sciences, 2009. http://dx.doi.org/10.1051/dymat/2009132.

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3

Stroetmann, Richard, und Lars Sieber. „Assessment of the brittle fracture behaviour of old mild steel structures“. In IABSE Symposium, Vancouver 2017: Engineering the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2017. http://dx.doi.org/10.2749/vancouver.2017.2559.

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Bergonzini, E., G. Bolelli, B. Bonferroni, L. Lusvarghi, T. Varis, U. Kanerva, T. Suhonen, J. Oksanen, O. Söderberg und S. P. Hannula. „Wear Behaviour of HVOF-Sprayed Nanostructured WC-CoCr Coatings“. In ITSC2011, herausgegeben von B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima und A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0590.

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Abstract HVOF-sprayed WC–10wt%Co–4wt.%Cr coatings were obtained using experimental feedstock powders (manufactured by spray-drying + sintering), containing nanometric carbide particles. Three reference coatings were also deposited using commercially-available powders containing sub-micrometric carbide particles. The coatings obtained from nanostructured powders, although affected by decarburisation phenomena, contained very fine carbide particles (~200 nm size). Those obtained from commercially-available powders simultaneously exhibited sub-micrometric (~400 nm size) and micrometric carbide particles, and were much less decarburised. Sliding wear tests performed at room temperature against sintered Al2O3 balls showed the occurrence of brittle fracture wear (detachment of near-surface material by local brittle cracking) on the nanostructured coatings, which were embrittled by decarburisation. The reference coatings, by contrast, exhibited either ductile wear behaviour (plastic deformation, pull-out of single carbide particles) or a mix of both ductile and brittle wear mechanisms. When the decarburisation of the nanostructured coatings was not too extensive, their wear loss was comparable to that of the reference ones. At 500 °C, the wear behaviour of all coatings was dominated by abrasive grooving, on account of thermal softening. The most decarburised nanostructured coatings, however, still experienced brittle cracking as well.

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Eschenauer, H. A., und T. Vietor. „Aspects in the Shape Optimization Using Brittle and Ductile Materials“. In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0100.

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Abstract The use of advanced materials will increasingly gain importance in future developments of constructions in mechanical, electrical and civil engineering. For this reason, the material behaviour in particular has to be considered when finding optimal layouts for components. Here, the different failure mechanisms of the applied materials must be taken into consideration. This paper presents a comparison between conventional, ductile materials and brittle ceramics as an example of an advanced material. In order to find a failure criterion which is characteristic of the material, stochastic models of the defects determining the failure of ceramic materials have been included. A strong variation in the calculated optimal design shows that an accurate consideration of the material behaviour and its mathematical description is important for the results to be found. The use of conventional stress criteria does not suffice for ceramic materials.

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Bansal, P., P. H. Shipway und S. B. Leen. „Finite Element Modelling of Acoustic Emission Behaviour of Thermally Sprayed WC-Co Coatings“. In ITSC2005, herausgegeben von E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0320.

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Abstract The acoustic emission (AE) technique, when used with the four-point bend test, is potentially an effective method for characterization of the ductility and fracture behaviour of certain thermally sprayed coatings. Monitoring of AE during such tests on brittle coatings reveals that the rate of the occurrence of events with increasing load changes gradually over the duration of the test. In this work, finite element modelling (FEM) of a brittle coating on an elastic substrate in four-point bending is used to analyze the fracture behaviour of the coating and predict its AE behaviour. The results from the FE analysis show good agreement with experimental data from four-point bending of thermally sprayed WC-Co coatings.

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Lassen, Tom. „Mooring Line Components With Semi-Brittle Behavior: Verification of Fitness for Purpose“. In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49231.

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Low impact energy for Charpy V Notch (CVN) specimens and associated low Crack Tip Opening Displacement (CTOD) values have occurred on several occasions in high strength steel offshore mooring components. In the present work an Engineering Critical Assessment (ECA) for shackles has been carried out to demonstrate fitness for purpose. Typical values for CVN and CTOD are 17 Joules and 0.01 mm respectively at design temperature. The purpose of the present work is to demonstrate that even in the case where normal quality requirements are not met, the shackles may still have enough structural integrity and fatigue durability to withstand the load spectrum in the field during the planned target service life of typically 20 years. The ECA is based on applied fracture mechanics as outlined in the BS7910 document. Shackles made of QR4 high strength steel with different geometries and loading modes are analyzed. Extreme load cases and fatigue load spectra are treated and fracture mechanics modelling is discussed. A CTOD value as low as 0.01 mm may give critical surface crack depth close to 1% of the diameter in an ultimate limit state condition. For normal ductile steel behaviour the critical crack depth is usually close to 15% of the diameter. However, under the assumption that the pre-existing crack depth is 0.25 mm, the predicted fatigue life based on fracture mechanics analysis is still over 100 years. For a target service life of 20 years this corresponds to a Design Factor Fatigue (DFF) of 5. This is close to the requirement given by DNV for mooring chains. Based on the present analysis it can be concluded that the shackles are fit for purpose as manufactured even under unfavourable and unlikely assumptions.

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Rabczuk, T., B. Bezensek und S. Bordas. „Application of Extended Element-Free Galerkin Method to Multiple Flaws Under Brittle Fracture Conditions“. In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61550.

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The extended element-free Galerkin (XEFG) method incorporates cracks through partition of unity enrichment of the standard basis functions. Discontinuous functions are added to capture the jump through the crack faces and near-front enrichment is added to capture the asymptotic behaviour in the vicinity of the crack fronts. Depending on the material behaviour, these functions can be of various type. The method can treat initiation, growth and coalescence of cracks seamlessly in both linear elastic and non-linear settings. The method is a powerful tool for modelling and studying crack paths, which are a central feature in the assessment of multiple flaws. The method is applied to the problem of multiple non-aligned flaws in a ferritic plate under cleavage failure. Fracture paths from two non-aligned notches in a plate are modelled. Based on the observations of crack paths the critical flaw alignment distance is established for non-aligned through-wall flaws.

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Mirzaee-Sisan, Ali, Saeid Hadidi-Moud und David John Smith. „Comparison of Methods for Predicting the Influence of Residual Stresses on Brittle Fracture“. In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26712.

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This paper compares different methods for predicting the influence of residual stresses on brittle fracture. Comparison is made between fracture predictions of a local statistical approach based on the Beremin type model, with those of a well-known fracture assessment procedures, BS7910 and R6 that uses a failure assessment diagram (FAD). The results from both methods are discussed and compared. The study focuses on the behaviour of a ferritic steel pipe containing a part-through circumferential thumb-nail crack on the outer surface of the vessel.

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Martin, Gre´goire, Patrick Hornet, Mustafa Koc¸ak und Afshin K. Motarjemi. „Fracture Behaviour of Mis-Matched Dissimilar Welds: Experimental Results“. In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1099.

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In nuclear plants, ferritic-austenitic welded joints are commonly used. To better understand their fracture performances, EDF and GKSS have carried out a joint R&D project. In order to study the only influence of the strength mismatch and not of the Heat Affected Zone (HAZ), diffusion bonding process has been used. The characterization plan included numbers of tensile and fracture mechanics tests, on homogenous and bi-material specimens. Some Single Edge Notched Bending specimens (SENB) with the crack at different positions (that is to say in the ferrific side, austenitic side and finally at the interface) were used for the fracture toughness evaluation of the bi-material configuration. They showed the effect of strength mismatch relaxing the crack tip stress state at the interface. The paper will discuss in detail further features of the ductile and brittle fracture observed on this bi-material system.

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Berichte der Organisationen zum Thema "Brittle behaviour"

1

Freund, L. B. Dynamic Behavior of Brittle Materials. Fort Belvoir, VA: Defense Technical Information Center, Juli 1999. http://dx.doi.org/10.21236/ada369852.

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2

Voorhees, Travis John. Investigating the Shock Compaction Behavior of Brittle Powders. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1469501.

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Voorhees, Travis John. Investigating the Dynamic Compaction Behavior of Brittle Powders. Office of Scientific and Technical Information (OSTI), März 2019. http://dx.doi.org/10.2172/1498011.

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4

Heerens, Jurgen, und D. T. Reed. Fracture behavior of a pressure vessel steel in the ductile-to-brittle transition region. Gaithersburg, MD: National Institute of Standards and Technology, 1988. http://dx.doi.org/10.6028/nist.ir.88-3099.

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5

Chung, H. M., L. J. Nowicki und D. E. Busch. Ductile-brittle transition behavior of V-4Cr-4Ti irradiated in the dynamic helium charging experiment. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/115709.

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6

Kurtz, R. J., M. L. Hamilton und H. Li. Grain boundary chemistry and heat treatment effects on the ductile-to-brittle transition behavior of vanadium alloys. Office of Scientific and Technical Information (OSTI), März 1998. http://dx.doi.org/10.2172/335371.

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7

Lever, James, Emily Asenath-Smith, Susan Taylor und Austin Lines. Assessing the mechanisms thought to govern ice and snow friction and their interplay with substrate brittle behavior. Engineer Research and Development Center (U.S.), Dezember 2021. http://dx.doi.org/10.21079/1168142742.

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Sliding friction on ice and snow is characteristically low at temperatures common on Earth’s surface. This slipperiness underlies efficient sleds, winter sports, and the need for specialized tires. Friction can also play micro-mechanical role affecting ice compressive and crushing strengths. Researchers have proposed several mechanisms thought to govern ice and snow friction, but directly validating the underlying mechanics has been difficult. This may be changing, as instruments capable of micro-scale measurements and imaging are now being brought to bear on friction studies. Nevertheless, given the broad regimes of practical interest (interaction length, temperature, speed, pressure, slider properties, etc.), it may be unrealistic to expect that a single mechanism accounts for why ice and snow are slippery. Because bulk ice, and the ice grains that constitute snow, are solids near their melting point at terrestrial temperatures, most research has focused on whether a lubricating water film forms at the interface with a slider. However, ice is extremely brittle, and dry-contact abrasion and wear at the front of sliders could prevent or delay a transition to lubricated contact. Also, water is a poor lubricant, and lubricating films thick enough to separate surface asperities may not form for many systems of interest. This article aims to assess our knowledge of the mechanics underlying ice and snow friction.

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Bowman, Mark. Fatigue Behavior of Beam Diaphragm Connections with Intermittent Fillet Welds: Part II, Brittle Fracture Examination of the I-64 Blue River Bridge. West Lafayette, IN: Purdue University, 2002. http://dx.doi.org/10.5703/1288284313224.

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INVESTIGATION OF BEHAVIOR OF INTERIOR STEEL CONNECTIONS WITH OPENINGS IN BEAM WEB AND FLANGE UNDER MONOTONIC LOADING. The Hong Kong Institute of Steel Construction, Dezember 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.2.

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Connections are considered to be one of the most prominent components of steel moment frames and have received studious attention in recent years. The core problem of welded connections is premature brittle fracture of weld in the critical beam-to-column connection region. Within the framework of this issue, various approaches have been proposed to solve the mentioned problem. Intentional weakening of the beam web or flange is in line with the purpose of leading the plastic hinge away from the column face, hence, increasing the ductility. The aim of this research is to investigate the behavior of interior connections subjected to monotonic lateral loading in case of presence of openings in beam web or flange. To do so, an ordinary fully welded rigid connection, reduced beam section, reduced web section, and drilled flange connection models are simulated numerically, utilizing finite element software, ANSYS. The results indicate that scrupulous selection of opening sizes are of great importance to fulfill the desired outcome which is avoiding the brittle failure of connections. Furthermore, the use of drilled flange, reduced beam section, or reduced web section connections satisfy the expected performance and it is proposed to use them according to practicability, architectural and economic considerations as well as site conditions. Shear deformation and local buckling is observed in reduced web section connections while in drilled flange connections, stress concentration around the opening is critical.

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TENSILE BEHAVIOR OF T-STUB SUBJECTED TO STATIC AND DYNAMIC LOADS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.313.

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To study the tensile behavior of T-stubs with various design parameters under different loading scenarios, uniaxial static and dynamic tensile tests were carried out. The effects of flange thickness, bolt preload, bolt strength and loading conditions were discussed. The failure modes observed under different conditions were presented. Besides, the load-displacement response was analyzed in detail. The experimental results showed that the bolt preload only affected the initial stiffness of the specimens, and smaller flange thickness and lower bolt strength would result in unfavorable performance of T-stubs. Under dynamic loading scenarios, the test specimens showed greater resistance but limited deformation capacity compared to the static ones. Furthermore, it was observed that the ductility would be seriously reduced if brittle failure, such as bolt or weld fracture occurred which is recommended to be avoided in structural design.

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