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Author : Geralf Hütter
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (123 download)
Download or read book Multi-scale Simulation of Crack Propagation in the Ductile-brittle Transition Region written by Geralf Hütter and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Geralf Hütter
Publisher :
ISBN 13 : 9783860124635
Total Pages : 127 pages
Book Rating : 4.1/5 (246 download)
Download or read book Multi-Scale Simulation of Crack Propagation in the Ductile-Brittle Transtions Region written by Geralf Hütter and published by . This book was released on 2013 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elisabeth Bouchaud
Publisher : Springer Science & Business Media
ISBN 13 : 9401006563
Total Pages : 369 pages
Book Rating : 4.4/5 (1 download)
Download or read book Physical Aspects of Fracture written by Elisabeth Bouchaud and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main scope of this Cargese NATO Advanced Study Institute (June 5-17 2000) was to bring together a number of international experts, covering a large spectrum of the various Physical Aspects of Fracture. As a matter of fact, lecturers as well as participants were coming from various scientific communities: mechanics, physics, materials science, with the common objective of progressing towards a multi-scale description of fracture. This volume includes papers on most materials of practical interest: from concrete to ceramics through metallic alloys, glasses, polymers and composite materials. The classical fields of damage and fracture mechanisms are addressed (critical and sub-critical quasi-static crack propagation, stress corrosion, fatigue, fatigue-corrosion . . . . as well as dynamic fracture). Brittle and ductile fractures are considered and a balance has been carefully kept between experiments, simulations and theoretical models, and between the contributions of the various communities. New topics in damage and fracture mechanics - the effect of disorder and statistical aspects, dynamic fracture, friction and fracture of interfaces - were also explored. This large overview on the Physical Aspects of Fracture shows that the old barriers built between the different scales will soon "fracture". It is no more unrealistic to imagine that a crack initiated through a molecular dynamics description could be propagated at the grain level thanks to dislocation dynamics included in a crystal plasticity model, itself implemented in a finite element code. Linking what happens at the atomic scale to fracture of structures as large as a dam is the new emerging challenge.
Author : Kristopher Learion Baker
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (826 download)
Download or read book Improving Atomistic Simulations to Predict Deformation and Fracture written by Kristopher Learion Baker and published by . This book was released on 2012 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomistic simulations can illuminate detailed mechanisms of brittle and ductile fracture and plasticity. However, there are many limitations to these simulations like short timescales, small spatial scales, and limitations of the discretization. Using molecular dynamics (MD) and multiscale methods, adaptations can be made to allow MD to answer problems relevant to engineers. In the first of three examples, MD is adapted to simulate brittle fracture by changing the discretization and allowing permanent damage between particles. By changing the discretization, specific mechanisms inherent to MD can be suppressed to allow accurate, macroscopic simulations of dynamic fragmentation of brittle materials. Second, the timescale available to MD is extended in a concurrent multiscale method (CADD) combined with accelerated MD. This combined approach allows for microseconds of simulation time at experimentally achievable loading rates. The method is applied to crack opening in aluminum alloys, and the effect of the loading rate on crack growth mechanisms is observed. From the results, it is clear that crack growth mechanisms depend greatly on the rate of the far-field loading. Third, the effect of aging on fatigue crack growth is studied by varying the resistance to dislocation motion in the dislocation dynamics region of CADD. Only in a multiscale simulation like CADD, can dislocation pileups reaching microns into the material interact with the atomic-scale mechanisms at a crack tip. The results of the simulations indicated that increasing the friction force raises the fatigue crack threshold. Also, a transition from stage I fatigue crack growth to stage II fatigue crack growth occurs by dislocations shielding dislocation nucleation on the primary slip plane. These observations support the conclusion that the fatigue crack growth threshold is controlled by the spacing between obstacles to dislocation glide, which is consistent with experimental observations.
Author : Siegfried Schmauder
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110412519
Total Pages : 409 pages
Book Rating : 4.1/5 (14 download)
Download or read book Multiscale Materials Modeling written by Siegfried Schmauder and published by Walter de Gruyter GmbH & Co KG. This book was released on 2016-08-22 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents current spatial and temporal multiscaling approaches of materials modeling. Recent results demonstrate the deduction of macroscopic properties at the device and component level by simulating structures and materials sequentially on atomic, micro- and mesostructural scales. The book covers precipitation strengthening and fracture processes in metallic alloys, materials that exhibit ferroelectric and magnetoelectric properties as well as biological, metal-ceramic and polymer composites. The progress which has been achieved documents the current state of art in multiscale materials modelling (MMM) on the route to full multi-scaling. Contents: Part I: Multi-time-scale and multi-length-scale simulations of precipitation and strengthening effects Linking nanoscale and macroscale Multiscale simulations on the coarsening of Cu-rich precipitates in α-Fe using kinetic Monte Carlo, Molecular Dynamics, and Phase-Field simulations Multiscale modeling predictions of age hardening curves in Al-Cu alloys Kinetic Monte Carlo modeling of shear-coupled motion of grain boundaries Product Properties of a two-phase magneto-electric composite Part II: Multiscale simulations of plastic deformation and fracture Niobium/alumina bicrystal interface fracture Atomistically informed crystal plasticity model for body-centred cubic iron FE2AT ・ finite element informed atomistic simulations Multiscale fatigue crack growth modeling for welded stiffened panels Molecular dynamics study on low temperature brittleness in tungsten single crystals Multi scale cellular automata and finite element based model for cold deformation and annealing of a ferritic-pearlitic microstructure Multiscale simulation of the mechanical behavior of nanoparticle-modified polyamide composites Part III: Multiscale simulations of biological and bio-inspired materials, bio-sensors and composites Multiscale Modeling of Nano-Biosensors Finite strain compressive behaviour of CNT/epoxy nanocomposites Peptide・zinc oxide interaction
Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)
Download or read book Three-Dimensional Gear Crack Propagation Studies written by and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-dimensional crack growth simulation was performed on a split-tooth gear design using boundary element modeling and linear elastic fracture mechanics. Initial cracks in the fillet of the teeth produced stress intensity factors of greater magnitude (and thus, greater crack growth rates) than those in the root or groove areas of the teeth. Crack growth simulation was performed on a case study to evaluate crack propagation paths. Tooth fracture was predicted from the crack growth simulation for an initial crack in the tooth fillet region. Tooth loads on the uncracked mesh of the split-tooth design were up to five times greater than those on the cracked mesh if equal deflections of the cracked and uncracked teeth were considered. Predicted crack shapes as well as crack propagation life are presented based on calculated stress intensity factors, mixed-mode crack propagation trajectory theories, and fatigue crack growth theories.
Download or read book Modeling the Ductile Brittle Fracture Transition in Reactor Pressure Vessel Steels Using a Cohesive Zone Model Based Approach written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture properties of Reactor Pressure Vessel (RPV) steels show large variations with changes in temperature and irradiation levels. Brittle behavior is observed at lower temperatures and/or higher irradiation levels whereas ductile mode of failure is predominant at higher temperatures and/or lower irradiation levels. In addition to such temperature and radiation dependent fracture behavior, significant scatter in fracture toughness has also been observed. As a consequence of such variability in fracture behavior, accurate estimates of fracture properties of RPV steels are of utmost importance for safe and reliable operation of reactor pressure vessels. A cohesive zone based approach is being pursued in the present study where an attempt is made to obtain a unified law capturing both stable crack growth (ductile fracture) and unstable failure (cleavage fracture). The parameters of the constitutive model are dependent on both temperature and failure probability. The effect of irradiation has not been considered in the present study. The use of such a cohesive zone based approach would allow the modeling of explicit crack growth at both stable and unstable regimes of fracture. Also it would provide the possibility to incorporate more physical lower length scale models to predict DBT. Such a multi-scale approach would significantly improve the predictive capabilities of the model, which is still largely empirical.
Author : Xiaosheng Gao
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.:/5 (447 download)
Download or read book Numerical Modeling of Crack Growth in Ductile-brittle Transition Regime written by Xiaosheng Gao and published by . This book was released on 1998 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wenjia Gu
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Atomistic Modeling of Crack Tip Behavior in Ductile Materials written by Wenjia Gu and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is composed of three papers and related unpublished work that laid the foundation for the succeeding scientific discoveries. The first two papers detail work intended to illuminate the atomic-scale mechanisms governing the near threshold fatigue crack growth phenomenon. First, by harnessing a concurrent multiscale approach and contemporary computational resources, fatigue crack simulations with cycle counts well beyond those analyzed previously have been performed. The validity of long-hypothesized material separation mechanisms thought to control near threshold fatigue crack growth in vacuum is assessed. Results show that fatigue crack growth arrests after an initial transient period, reconciling reports of crack growth in atomistic simulations at loading amplitudes below experimental crack growth thresholds. It is also observed that sustained crack growth in vacuum only occurs when emitted dislocations return to the crack tip on a slip plane behind its original one, which is resulted from slip trace intersection in the 2D simulated system and is expected to occur in 3D crystals by other additional mechanisms. Second, building upon the concurrent atomistic-continuum multiscale modeling framework, the isolated effect of material dissolution on crack growth is investigated. A series of dissolution simulations are carried out with different loading conditions and dissolution rates. Simulation results and subsequent quantitative analysis suggest that while dissolution is capable of freeing arrested fatigue cracks, the crack tip is always blunted under both static and cyclic loading, implying that dissolution has an overall crack arresting effect, and the dissolution-induced-blunting is found to be independent of the mechanical loading magnitude. Finally, from a standpoint of how state-of-the-art engineering and technology can be applied to other applications in an attempt to directly better the human condition, the third paper details a field work about the assessment of additive manufacturing for increasing sustainability and productivity of smallholder agriculture. This study analyzes and compares different manufacturing approaches from the perspectives of structural performance and cost efficiency and seeks to provide solutions to the mechanical obstacles encountered by smallholder farmers in the field. The acquired data suggests that the material extrusion 3D printing technology is able to provide functional parts more rapidly, accelerating the design cycle, and lowering cost relative to local fabrication routes, while traditional means is proved to be more economical in the case where mechanical performance of the part is the most critical.
Author : Steven M. Arnold and Terry T. Wong, Editors
Publisher : ASM International
ISBN 13 : 1615038434
Total Pages : 206 pages
Book Rating : 4.6/5 (15 download)
Download or read book Models, Databases and Simulation Tools Needed for Realization of Integrated Computational Mat. Eng. (ICME 2010) written by Steven M. Arnold and Terry T. Wong, Editors and published by ASM International. This book was released on 2011 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Blaise Bourdin
Publisher : Springer Science & Business Media
ISBN 13 : 1402063954
Total Pages : 173 pages
Book Rating : 4.4/5 (2 download)
Download or read book The Variational Approach to Fracture written by Blaise Bourdin and published by Springer Science & Business Media. This book was released on 2008-04-19 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting original results from both theoretical and numerical viewpoints, this text offers a detailed discussion of the variational approach to brittle fracture. This approach views crack growth as the result of a competition between bulk and surface energy, treating crack evolution from its initiation all the way to the failure of a sample. The authors model crack initiation, crack path, and crack extension for arbitrary geometries and loads.
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (96 download)
Download or read book Modeling Crack Propagation in Polycrystalline Microstructure Using Variational Multiscale Method written by and published by . This book was released on 2016 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Behzad Massoumzadeh
Publisher :
ISBN 13 :
Total Pages : 1098 pages
Book Rating : 4.:/5 (14 download)
Download or read book Computer Simulations Studies written by Behzad Massoumzadeh and published by . This book was released on 1995 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chiara Gattinoni
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.:/5 (757 download)
Download or read book Modelling of Crack-dislocation Interactions Using the 'learn on the Fly' Multiscale Molecular Dynamics Technique written by Chiara Gattinoni and published by . This book was released on 2010 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between fractures and mobile dislocations in ductile materials has been extensively studied and its importance to crack dynamics is well established. However, the presence of such defects in brittle crack propagation is not less important. In fact, the coupling between the stress fields of a crack and of the dislocations induces changes in the lattice trapping and deflections on the crack propagation path, as predicted by continuum mechanics results and as shown by recent experiments. In this thesis, I describe a multi-scale atomistic approach to this issue by the modelling of a silicon system containing a fracture propagating on the (110) plane and a 90° partial static dislocation having the core aligned parallel to the crack front. Geometry optimisation and finite-temperature molecular dynamics simulations are performed on the system by means of the 'Learn on the Fly' hybrid atomistic technique. Within this hybrid formalism, a quantum-mechanical treatment of the chemically complex crack tip and dislocation core regions are seamlessly coupled to a simpler classical description of the long-range elastic field in the surrounding silicon crystal. The results of the simulations predict deflections of the straight crack propagation path, however the pattern of the deflections is different according to the relative position between the crack and the dislocation. Also marked repercussions on the lattice trapping as the dislocation is introduced in the material are detected from the simulations.
Author : Peter Deuflhard
Publisher : Springer Science & Business Media
ISBN 13 : 9783540210993
Total Pages : 444 pages
Book Rating : 4.2/5 (19 download)
Download or read book Newton Methods for Nonlinear Problems written by Peter Deuflhard and published by Springer Science & Business Media. This book was released on 2005-01-13 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the efficient numerical solution of challenging nonlinear problems in science and engineering, both in finite and in infinite dimension. Its focus is on local and global Newton methods for direct problems or Gauss-Newton methods for inverse problems. Lots of numerical illustrations, comparison tables, and exercises make the text useful in computational mathematics classes. At the same time, the book opens many directions for possible future research.
Author : M.H. Aliabadi
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038261165
Total Pages : 170 pages
Book Rating : 4.0/5 (382 download)
Download or read book Advances in Crack Growth Modeling written by M.H. Aliabadi and published by Trans Tech Publications Ltd. This book was released on 2013-07-15 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters BCI (WoS). Crack growth is a complex phenomenon and difficult to model without assumed simplifications. In recent years, there has been an increasing realization that advanced computational methods such as the Finite Element Method, the Boundary Element Method and Mesh Free Methods can be used to simulate crack growth in complex structural parts. This special issue contains original papers written by active researchers in the field of computational fracture mechanics. The aim is to inform those in the fracture mechanics community who might not be at the forefront of computational research of the recent developments and techniques available and the wide range of applications for which solutions are now possible.
Author : Takayuki Kitamura
Publisher : CRC Press
ISBN 13 : 9814241830
Total Pages : 306 pages
Book Rating : 4.8/5 (142 download)
Download or read book Fracture Nanomechanics written by Takayuki Kitamura and published by CRC Press. This book was released on 2011-09-06 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small structures of the micro/nanometer scale, such as electronic/optic devices and MEMS/NEMS have been developed, and the size of their elements now approaches the nano/atomic scale. This book discuses the fracture behavior of nano/atomic elements (nanofilms, nanowires, and so on) and focuses on the initiation and propagation of interface crack and mechanical instability criterion of atomic structures. This covers the fundamentals and the applicability of the top-down (conventional fracture mechanics to nanoscale) and bottom-up (atomic mechanics including ab initio simulation) concepts. New areas, such as multiphysics characteristics of nanoelements, are introduced as well.
