Relevant bibliographies by topics / Constitutive Modelling

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Constitutive Modelling'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 June 2025

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Journal articles on the topic "Constitutive Modelling"

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Cambou,, B., C. Di Prisco,, and K. Hutter,. "Constitutive Modelling of Geomaterials." Applied Mechanics Reviews 55, no. 3 (2002): B41. http://dx.doi.org/10.1115/1.1470665.

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Wilson, Helen J. "Instabilities and constitutive modelling." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, no. 1849 (2006): 3267–83. http://dx.doi.org/10.1098/rsta.2006.1892.

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The plastics industry today sees huge wastage through product defects caused by unstable flows during the manufacturing process. In addition, many production lines are throughput-limited by a flow speed threshold above which the process becomes unstable. Therefore, it is critically important to understand the mechanisms behind these instabilities. In order to investigate the flow of a molten plastic, the first step is a model of the liquid itself, a relation between its current stress and its flow history called a constitutive relation. These are derived in many ways and tested on several benchmark flows, but rarely is the stability of the model used as a criterion for selection. The relationship between the constitutive model and the stability properties of even simple flows is not yet well understood. We show that in one case a small change to the model, which does not affect the steady flow behaviour, entirely removes a known instability. In another, a change that makes a qualitative difference to the steady flow makes only tiny changes to the stability. The long-term vision of this research is to exactly quantify what are the important properties of a constitutive relation as far as stability is concerned. If we could understand that, not only could very simple stability experiments be used to choose the best constitutive models for a particular material, but our ability to predict and avoid wasteful industrial instabilities would also be vastly improved.
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Holzapfel, Gerhard A., and Ray W. Ogden. "Constitutive modelling of arteries." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2118 (2010): 1551–97. http://dx.doi.org/10.1098/rspa.2010.0058.

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This review article is concerned with the mathematical modelling of the mechanical properties of the soft biological tissues that constitute the walls of arteries. Many important aspects of the mechanical behaviour of arterial tissue can be treated on the basis of elasticity theory, and the focus of the article is therefore on the constitutive modelling of the anisotropic and highly nonlinear elastic properties of the artery wall. The discussion focuses primarily on developments over the last decade based on the theory of deformation invariants, in particular invariants that in part capture structural aspects of the tissue, specifically the orientation of collagen fibres, the dispersion in the orientation, and the associated anisotropy of the material properties. The main features of the relevant theory are summarized briefly and particular forms of the elastic strain-energy function are discussed and then applied to an artery considered as a thick-walled circular cylindrical tube in order to illustrate its extension–inflation behaviour. The wide range of applications of the constitutive modelling framework to artery walls in both health and disease and to the other fibrous soft tissues is discussed in detail. Since the main modelling effort in the literature has been on the passive response of arteries, this is also the concern of the major part of this article. A section is nevertheless devoted to reviewing the limited literature within the continuum mechanics framework on the active response of artery walls, i.e. the mechanical behaviour associated with the activation of smooth muscle, a very important but also very challenging topic that requires substantial further development. A final section provides a brief summary of the current state of arterial wall mechanical modelling and points to key areas that need further modelling effort in order to improve understanding of the biomechanics and mechanobiology of arteries and other soft tissues, from the molecular, to the cellular, tissue and organ levels.
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Murthy, Tejas G., and Arghya Das. "Constitutive Modelling of Geomaterials." Indian Geotechnical Journal 49, no. 4 (2019): 367–68. http://dx.doi.org/10.1007/s40098-019-00381-7.

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Laloui, Lyesse, Françoise Geiser, and Laurent Vulliet. "Constitutive modelling of unsaturated soils." Revue Française de Génie Civil 5, no. 6 (2001): 797–807. http://dx.doi.org/10.1080/12795119.2001.9692327.

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Gao, Zhiwei, and Yi Hong. "Constitutive modelling of gassy clay." E3S Web of Conferences 92 (2019): 15005. http://dx.doi.org/10.1051/e3sconf/20199215005.

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Fine grained sediments with undissolved gas bubbles are widely distributed in the seabed around the world. The gas bubbles are much larger than the clay particles and fit in the saturated clay matrix rather than the pore water. Generally, these bubbles tend to degrade the soil stiffness and strength. But when the difference between the gas and pore water pressure is sufficiently small, pore water in the saturated clay matrix can drain into the cavities, making the void ratio of the saturated matrix smaller, which makes the undrained shear strength of the gassy clay sample higher than that of a saturated one. Such soil response cannot be described based on the assumption that gassy clay is a soil with compressible pore fluid. A new constitutive model for describing the stress-strain relation for gassy clay is proposed. An important feature of the model is that the gassy clay is considered as a composite material with compressible cavities which could be flooded by pore water. Effect of gas cavities on plastic hardening on the saturated matrix is accounted for. The model has been used to predict the response of three gassy clays and good agreement between the test data and model simulations is observed. Potential improvement of the model is discussed.
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Miller, Karol. "Constitutive modelling of abdominal organs." Journal of Biomechanics 33, no. 3 (2000): 367–73. http://dx.doi.org/10.1016/s0021-9290(99)00196-7.

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Olsson, A. "Constitutive modelling of stainless steel." Journal of Constructional Steel Research 46, no. 1-3 (1998): 457. http://dx.doi.org/10.1016/s0143-974x(98)80084-9.

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M.P. "Geomaterials: Constitutive equations and modelling." Computers and Geotechnics 9, no. 3 (1990): 233–34. http://dx.doi.org/10.1016/0266-352x(90)90015-n.

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Yang, Ping, and Ying Tong. "Constitutive Modelling for Anisotropic Damage in Woven E-Glass Reinforcements." Open Materials Science Journal 11, no. 1 (2017): 9–21. http://dx.doi.org/10.2174/1874088x01711010009.

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It is easy for composite laminates to be damaged by relative lower velocity impact which could give rise to internal delamination that will strongly weaken the compressive strength of laminates. In order to predict the occurrence of matrix failure, the elastic-brittle behaviors of fiber-reinforced composites were modeled constitutively by an anisotropic damage model. The dynamic tensile testing was performed at a constant velocity of 2 mm/min until the sample broke to achieve the mechanical parameters of E-glass reinforcements. The elastic constitutive equation and the constitutive damage model were obtained on basis of the fundamental theory of mechanics about the orthotropic constitutive of reinforcements. The methodology for this constitutive model which is developed by Hashin considered both the effect of fiber and matrix failure. Then, the developed constitutive equations were incorporated into the FE (finite element) codes, ABAQUS, through the user subroutine module to simulate the process of projectile impacting GFRP composite laminates. The results show that the material deformation reaches a maximum at 24 μs, then occurs rebound with the increase of the time. The stress of reinforcements traverse section linearly increases outward from 0 MPa to 509.8 MPa. Material damage area increases with the prolonging of time, and for a fixed time, material damage gradually increases from the edges to the center and reaches a constant value of 1, which means the rupture of the damage process.
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Dissertations / Theses on the topic "Constitutive Modelling"

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Larsson, Rikard. "Constitutive Modelling of High Strength Steel." Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8157.

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<p>This report is a review on aspects of constitutive modelling of high strength steels. Aspects that have been presented are basic crystallography of steel, martensite transformation, thermodynamics and plasticity from a phenomenological point of view. The phenomenon called mechanical twinning is reviewed and the properties of a new material type called TWIP-steel have been briefly presented. Focus has been given on phenomenological models and methods, but an overview over multiscale methods has also been given.</p>
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Häggblad, Hans-åke. "Constitutive modelling of hard metal powder." Licentiate thesis, Luleå tekniska universitet, Material- och solidmekanik, 1985. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17673.

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Zhang, Bo. "Constitutive modelling of municipal solid waste." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/7984.

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Design of landfills must consider both stability and integrity of the lining system. Therefore, stresses and strains in both mineral and geosynthetic lining materials must be controlled. Interaction between waste and barrier system is of particular importance for assessing the stability and structural integrity of steep non-self supporting barrier systems. The most appropriate approach to assess the interaction is the use of numerical modelling techniques, and therefore an appropriate constitutive model for waste material is required to represent its mechanical behaviour. In a literature review the key aspects of mechanical behaviour of municipal solid waste (MSW) were investigated, including the influence of compressible and reinforcing particles on compression and shear behaviour of MSW were identified. Constitutive modelling of both MSW and soil material were reviewed, based on which the methodology for this study have been developed. In addition, requirements of an appropriate constitutive model for MSW have been suggested from the numerical modelling experience, and a framework to develop a constitutive model for MSW was produced. A one-dimensional compression model was developed by including the influence of compressible particles on MSW compression behaviour. One-dimensional compression tests on both real and synthetic waste samples were modelled and the results have shown that the compression model can reproduce the measured behaviour. A fibre reinforcing model was developed by including the influence of reinforcing particles on MSW shear behaviour. A triaxial compression test on fibre reinforced sand was modelled and the results have shown that the reinforcing model can predict its shear strength. A constitutive model for MSW has been developed by combining the Modified Cam-Clay with the one-dimensional compression and the fibre reinforcing models. Typical MSW triaxial compression tests have been modelled and the results have shown that the MSW model can reproduce the stress-strain behaviour in specific strain ranges. The constitutive model for MSW has been coded into a non-linear elasto-plastic finite element method program. Comparisons between the finite element analysis results and the analytical solutions have been performed and good agreements have been obtained.
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Kullaa, Jyrki. "Constitutive modelling of fibre-reinforced brittle materials /." Espoo : Technical Research Centre of Finland, 1998. http://www.vtt.fi/inf/pdf/publications/1998/P358.pdf.

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Mashoof, Said. "The mathematical modelling of concrete constitutive relationships." Thesis, City University London, 1989. http://openaccess.city.ac.uk/7952/.

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The available experimental evidence demonstrates the extreme nonlinear material behaviour of reinforced concrete structures. These nonlinear effects are attributed to the collective behaviour of the constituent materials in addition to factors such as cracking, crushing, aggregate interlock, creep, shrinkage, bond slip and rate of loading. Analytical methods have been improved in the past two decades as a result of the availibility of more powerful computers. It is, therefore, feasible to model these nonlinear features in order to conduct an analysis of the behaviour of reinforced concrete structures. The present research is concerned with some of these nonlinear effects. These include the formulation of a constitutive model for the three-dimensional stress-strain relationships of concrete and the mathematical modelling of cracked and crushed concrete. The proposed models have been implemented into a finite element system for the analysis of reinforced and pre-stressed concrete structures. Chapter One is a general introduction to structural nonlinearities and the finite element method. The structure of the thesis is also outlined. Chapter Two reviews available theoretical approaches used for the formulation of the concrete behaviour and assesses their relative advantages. The theory of plasticity is discussed in greater depth as it forms the foundation of the work in Chapter Three. A three-dimensional concrete yield surface is developed in Chapter Three. This yield surface is used in the theory of hardening plasticity to establish the incremental constitutive relationships for concrete. Furthermore, this model is extended to represent the strain-softening effect in concrete. The hardening and softening rule which has been developed is based on experimental results obtained from the literature. The results of the proposed model are compared with these experimental data. The cracking and crushing of concrete have been studied in Chapter Four. A rough crack model is developed for concrete and crack stress-displacement relationships due to aggregate interlock are formulated. A mathematical model is proposed for the effect of dowel forces in cracked reinforced concrete structures. The effect of bond stress between a steel bar and concrete has been introduced by a tension-stiffening factor and suitable formulations has been proposed. The results from the crack related models have also been compared with experimental data from the literature. Finally, stiffness matrices for cracked plain and reinforced concrete have been developed using a smeared crack approach. The concrete constitutive model and the crack model developed in Chapters Three and Four have been implemented into a finite element program for the numerical analyses given in Chapter Five. This implementation has been carried out for plane stress and axisymmetric solid stress problems. A reinforced concrete beam and a prestressed concrete reactor vessel have been analysed and the results compared with experimental data. Finally Chapter Six presents the overall conclusions and recommendations for further research.
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Gallipoli, Domenico. "Constitutive and numerical modelling of unsaturated soil." Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325448.

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Tan, Sia Min. "Constitutive and numerical modelling of bonded geomaterials." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435993.

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Ellison, Kirk Carr. "Constitutive modelling of a heavily overconsolidated clay." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610606.

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Diambra, Andrea. "Fibre reinforced sands : experiments and constitutive modelling." Thesis, University of Bristol, 2010. http://hdl.handle.net/1983/5135b1d5-8cd2-43fb-b204-3736d4beb6c3.

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The techniqueo f reinforcing soils with discrete flexible fibres is slowly gaining acceptancea nd support between practising engineers. However, little is known about the main factors governing the behaviour of this material and the main characteristics of its behaviour. This means that the applicability and potential of this soil improvement method have not been resolved. The present research aims to provide a considerable contribution in understanding the mechanisms governing the behaviour of this reinforced material and to develop a modelling tool which allows the-prediction of its mechanical behaviour. A procedure for the determination of the distribution of the orientation of fibre in reinforced specimens has been developed herein. It was found that the most common procedure for preparing reinforced specimens, moist tamping, leads to preferred sub-horizontal orientation of fibres. In view of these preliminary results an extensive campaign of compression and extension conventional triaxial tests for both drained and undrained condition has been perfon-ned.F ibres were found to be effective in increasingt he strengtho f the material but their effectiveness was found to be dependent on the orientation with respect to tensile strains. Fibres were also found to be effective in preventing the liquefaction of loose sand specimens: addition of fibres results in a densification of the sand matrix not only for the volume that they occupy but also for preventing the sand matrix from using some of the voids during the deformation process. A new constitutive modelling framework has been developed on the basis of the rule of mixtures of composite materials. This approach allows the adoption of separate constitutive laws for each constituent and to combine their effects in characterising the behaviour of the composite material. In this manner it is possible to select the complexity of the constitutive model of each constituent and to simulate peculiar aspect of its behaviour. Application of the model demonstrated how accurately the mechanical behaviour of fibre reinforced sand can be simulated with particular regard to the anisotropy of strength and the prevention of liquefaction
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Mallinder, Peter Alan. "Constitutive-based masonry vault mechanisms." Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/20007/.

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The objective of the research programme has been to investigate the behaviour of masonry arch vault collapse mechanisms in the context of the problems besetting the national bridge stock. The programme has primarily involved masonry constitutive theoretical studies, supported by laboratory experimentation, which have led to the formulation of novel masonry hinge modelling. The modelling has been developed for practical application in a four hinge masonry vault mechanism analysis and subjected to testing. The technique has been applied in the field supported by a novel application of information technology (IT) image processing, reflecting the growing importance of IT within the construction industry. All theoretical studies have been mounted as micro-computer software with graphics. The accent is upon engineering requirements in practice. Chapter One reviews the context and history of the masonry vault structural form, whose presence has long been commonplace in the United Kingdom, especially on the nation's road network. It is noted that elderly arched road bridges are under continual pressure to carry ever greater loads yet their strength is uncertain. Historically, structural analysts have attempted to resolve the arch's behaviour but present methods are still inexact. Chapter Two describes how, traditionally, masonry has been assumed to possess either a linear stress-strain property or infinite stiffness and strength. An alternative, novel equation for modelling masonry stress-strain laws is presented which may be configured to mimic the behaviour of real materials as well as that of the infinite strength and linear laws it replaces. A numerical analytical procedure has been developed to 'solve' rectangular masonry sections under combined bending and thrust thereby rendering the earlier approximations unnecessary. Chapter Three develops the theme further leading to the numerical determination of limit state hinge characteristics which furnish a static limit state axial thrust/bending moment interaction diagram and a corresponding serviceability limit state, prevention of cracking interaction diagram. Differentiation is thus made possible between hitherto identically-treated though varying natural materials and comparisons made. It is further postulated that any point on a static limit state interaction diagram locus represents a masonry hinge and an extensive series of laboratory model hinge tests is undertaken to demonstrate the point by testing the foregoing theoretical studies. Chapter Four describes the incorporation of the hinge theory into a mechanism-type computer analytical tool. Crucially, the analysis is different from other mechanism analyses by virtue of the hinge modelling, enabling the effects of material properties on arch behaviour to be studied. The software is tested in Chapter Five against prototype data for laboratory model and full size masonry bridges. Chapter Six introduces computer vision, an IT technique that is relatively novel to the structures field. It is adapted to monitor the above laboratory model arch tests and then extended to the monitoring of a multi-span arch bridge test in the field. Computer vision permits the formulation of a hypothesis regarding the unusual mode of failure that occurred and this is supported by a generalisation of the mechanism hinge theory, thereby demonstrating the merits of both techniques. Finally, Chapter Seven draws conclusions on the foregoing and makes suggestions for further work. Supporting documentation is given in the Appendices.
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Books on the topic "Constitutive Modelling"

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Puzrin, Alexander M. Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7.

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Kolymbas, Dimitrios, ed. Constitutive Modelling of Granular Materials. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57018-6.

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Merodio, José, and Raymond Ogden, eds. Constitutive Modelling of Solid Continua. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31547-4.

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Puzrin, A. M. Constitutive Modelling in Geomechanics: Introduction. Springer Berlin Heidelberg, 2012.

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Kolymbas, D. Constitutive Modelling of Granular Materials. Springer Berlin Heidelberg, 2000.

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F, Darve, and Butterfield R, eds. Geomaterials: Constitutive equations and modelling. Elsevier Applied Science, 1989.

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Desai, C. S., and G. Gioda, eds. Numerical Methods and Constitutive Modelling in Geomechanics. Springer Vienna, 1990. http://dx.doi.org/10.1007/978-3-7091-2832-9.

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Yin, Zhen-Yu, Pierre-Yves Hicher, and Yin-Fu Jin. Practice of Constitutive Modelling for Saturated Soils. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6307-2.

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Kullaa, Jyrki. Constitutive modelling of fibre-reinforced brittle materials. VTT, Technical Research Centre of Finland, 1998.

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Staroszczyk, Ryszard. Constitutive modelling of creep induced anisotropy of ice. Institute of Hydro-Engineering of the Polish Academy of Sciences, 2004.

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Book chapters on the topic "Constitutive Modelling"

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Wood, David Muir. "Constitutive Modelling." In Mechanical Behaviour of Soils Under Environmentally Induced Cyclic Loads. Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1068-3_2.

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Başar, Yavuz, and Dieter Weichert. "Constitutive modelling." In Nonlinear Continuum Mechanics of Solids. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04299-1_6.

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Puzrin, Alexander M. "Modelling Soil Behaviour." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_9.

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Puzrin, Alexander M. "Boundary Value Problems in Geotechnics." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_1.

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Puzrin, Alexander M. "Isotropic Elastic Behaviour." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_10.

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Puzrin, Alexander M. "Anisotropy and Coupling." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_11.

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Puzrin, Alexander M. "Pressure Dependency of Stiffness." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_12.

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Puzrin, Alexander M. "Small Strain Nonlinearity." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_13.

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Puzrin, Alexander M. "Failure." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_14.

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Puzrin, Alexander M. "Plastic Flow." In Constitutive Modelling in Geomechanics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27395-7_15.

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Conference papers on the topic "Constitutive Modelling"

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Cai, H., Z. Ghao, Y. Hong, J. Zhang, and D. Lu. "Constitutive Modelling of Overconsolidated Gassy Clay." In Innovative Geotechnologies for Energy Transition. Society for Underwater Technology, 2023. http://dx.doi.org/10.3723/njee7503.

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Fine-grained soils with free gas bubbles can be frequently encountered in the seabed or lakebed. Gassy soils can become overconsolidated due to sediment movement or submarine landslides. The presence of free gas bubbles in fine-grained soils can cause large-scale submarine landslides and offshore foundation failures. The gas bubbles can have either beneficial or detrimental effect on the soil strength and stiffness, depending on the stress state and gas volume fraction. A constitutive model accounting for the effect of overconsolidation on dilatancy is presented. The soil is considered as a composite with saturated soil matrix and cavities. The gas cavities are assumed to have a detrimental effect on the plastic modulus and shear strength. Bubble flooding makes the saturated soil matrix partially drained under a globally undrained condition, which has a beneficial effect on the soil stiffness and undrained shear strength. A series of undrained triaxial compression tests have been carried out on gassy Malaysian Kaolin and the data has been used to validate the model. The model can be used for assessing the slope stability and bearing capacity of foundations in gassy clay.
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Chen, Z. "Constitutive modelling of wood-based materials." In 16th World Congress on Computational Mechanics and 4th Pan American Congress on Computational Mechanics. CIMNE, 2024. http://dx.doi.org/10.23967/c.wccm.2024.113.

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Chen, Z. "Constitutive modelling of wood-based materials." In 16th World Congress on Computational Mechanics and 4th Pan American Congress on Computational Mechanics. CIMNE, 2024. https://doi.org/10.23967/wccm.2024.113.

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Baranowski, Paweł, and Jerzy Małachowski. "Possibilities of rock constitutive modelling and simulations." In COMPUTER METHODS IN MECHANICS (CMM2017): Proceedings of the 22nd International Conference on Computer Methods in Mechanics. Author(s), 2018. http://dx.doi.org/10.1063/1.5019135.

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Lederer, M., and J. Zarbakhsh. "Constitutive modelling of copper films on silicon substrate." In 2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2015. http://dx.doi.org/10.1109/eurosime.2015.7103130.

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ALDIERI, ALESSANDRA, MARA TERZINI, CRISTINA BIGNARDI, ELISABETTA M. ZANETTI, and ALBERTO L. AUDENINO. "A CONSTITUTIVE FRAMEWORK FOR HUMAN DERMIS MECHANICAL MODELLING." In MATERIALS CHARACTERISATION 2017. WIT Press, 2017. http://dx.doi.org/10.2495/mc170381.

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Deenadayalu, Chaitanya, Aditi Chattopadhyay, and Xu Zhou. "Constitutive Modelling of Progressive Damage in Composite Laminates." In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-1908.

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Pietryga, Michael P., Ivaylo N. Vladimirov, and Stefanie Reese. "Constitutive modelling of evolving flow anisotropy including distortional hardening." In THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011. AIP, 2011. http://dx.doi.org/10.1063/1.3589734.

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Resnyansky, A. D., Mark Elert, Michael D. Furnish, Ricky Chau, Neil Holmes, and Jeffrey Nguyen. "CONSTITUTIVE MODELLING OF SHOCK COMPRESSION OF A POROUS COPPER." In SHOCK COMPRESSION OF CONDENSED MATTER - 2007: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2008. http://dx.doi.org/10.1063/1.2833283.

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Peixoto, Rodrigo Guerra, Samuel Silva Penna, Gabriel de Oliveira Ribeiro, and Roque Luiz da Silva Pitangueira. "Non-local constitutive modelling by the boundary element method." In XXXVIII Iberian-Latin American Congress on Computational Methods in Engineering. ABMEC Brazilian Association of Computational Methods in Engineering, 2017. http://dx.doi.org/10.20906/cps/cilamce2017-0187.

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Reports on the topic "Constitutive Modelling"

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Oliynyk, Kateryna, and Matteo Ciantia. Application of a finite deformation multiplicative plasticity model with non-local hardening to the simulation of CPTu tests in a structured soil. University of Dundee, 2021. http://dx.doi.org/10.20933/100001230.

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In this paper an isotropic hardening elastoplastic constitutive model for structured soils is applied to the simulation of a standard CPTu test in a saturated soft structured clay. To allow for the extreme deformations experienced by the soil during the penetration process, the model is formulated in a fully geometric non-linear setting, based on: i) the multiplicative decomposition of the deformation gradient into an elastic and a plastic part; and, ii) on the existence of a free energy function to define the elastic behaviour of the soil. The model is equipped with two bonding-related internal variables which provide a macroscopic description of the effects of clay structure. Suitable hardening laws are employed to describe the structure degradation associated to plastic deformations. The strain-softening associated to bond degradation usually leads to strain localization and consequent formation of shear bands, whose thickness is dependent on the characteristics of the microstructure (e.g, the average grain size). Standard local constitutive models are incapable of correctly capturing this phenomenon due to the lack of an internal length scale. To overcome this limitation, the model is framed using a non-local approach by adopting volume averaged values for the internal state variables. The size of the neighbourhood over which the averaging is performed (characteristic length) is a material constant related to the microstructure which controls the shear band thickness. This extension of the model has proven effective in regularizing the pathological mesh dependence of classical finite element solutions in the post-localization regime. The results of numerical simulations, conducted for different soil permeabilities and bond strengths, show that the model captures the development of plastic deformations induced by the advancement of the cone tip; the destructuration of the clay associated with such plastic deformations; the space and time evolution of pore water pressure as the cone tip advances. The possibility of modelling the CPTu tests in a rational and computationally efficient way opens a promising new perspective for their interpretation in geotechnical site investigations.
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Dinovitzer. L52303 Development of Techniques to Assess the Long-Term Integrity of Wrinkled Pipeline. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010332.

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The objective of the project was to develop a numerical model than may be used to predict the wrinkle formation and post formation behavior of a pipeline considering the effect of soil confinement and define the specifications for the development of a comprehensive wrinkle integrity assessment process. The result of this research is the development of wrinkle assessment techniques that could be used directly or could be used to codify maintenance guidelines. This project focused specifically on the pipe soil interaction modeling wrinkle formation as a result of the relative movement of the pipe and soil. The structural model developed and validated in this program and previous work could be applied to wrinkle bends, however, this issue is not specifically addressed in this report. In addition, the project development efforts focused on the monotonic soil interaction event of idealized (e.g., no secondary degradation like corrosion features) pipe segments. The project completed a critical review of existing structural and soil modelling techniques to identify the most suitable technologies for this application. The soil-pipe interaction under soil movement was found to be best represented using the LS-DYNA Multi-material Eulerian technique which permitted the application of a number of suitable soil constitutive models. This analysis tool permitted the consideration of a range of soil types and large soil displacements. Having defined the most suitable tool set, several pipe soil interaction models were developed. These models were used to illustrate the types of analyses that could be completed and the capabilities of the models to illustrate the sensitivity of the scenario loads, displacements to changes in soil, pipe and other parameters. The modeling results were discussed to demonstrate that their trends and results were in line with intuitive assumptions and engineering judgment. Additional models were developed to simulate large scale pipe-soil interaction laboratory test programs. The results of the simulated test programs were compared with the laboratory results as an initial validation of the modeling techniques and tools. The simulated soil displacement patterns, pipe strains and pipe displacement were shown to agree well with experimental results and as such illustrated the ability of the models to reproduce idealized pipe-soil interaction events. Full-scale soil displacement events were modeled to illustrate the application of the modeling tools to forecast or predict the effects of axial and transverse soil movements on buried pipeline segments. These results were used to illustrate the methods and assumptions inherent in the application of the modeling tools to predict soil loading on pipeline systems.
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