Dissertations / Theses on the topic 'Elasto-plastic materials'
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Li, Wei 1970 May 26. "Yield and geodesic properties of random elasto-plastic materials." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115877.
Full textWhen the separation of scales in random media does not hold, the representative volume element (RVE) of deterministic continuum mechanics does not exist in the conventional sense, and new concepts and approaches are needed. This subject is discussed here in the context of microstructures of two types - planar random chessboards, and planar random inclusion-matrix composites -- with microscale behavior being elastic-plastic-hardening (power-law). The microstructure is assumed to be spatially homogeneous and ergodic. Principal issues under consideration are those of yield and incipient plastic flow of statistical volume elements (SVE) on mesoscales, and the scaling trend of SVE to the RVE response on macroscale. Indeed, the SVE responses under uniform displacement (or traction) boundary conditions bound from above (respectively, below) the RVE response, and we show via extensive simulations in plane stress that the larger is the mesoscale, the tighter are both bounds. However, the mesoscale flows under both kinds of loading do not, in general, display normality. Also, with the limitation imposed by currently available computational resources, we do not recover normality (or even a trend towards it) when studying the largest possible SVE domains.
The second topic is the geodesic (i.e., shortest path) character of strain fields occurring in elasto-plastic response of planar inclusion-matrix composites. The composites' spatially random morphology is created by generating the disk centers through a sequential inhibition process based on a poisson point field in plane. Both phases (inclusions and matrix) are elastic-plastic-hardening with the matrix being more compliant and weaker than the inclusions, and perfect bonding everywhere. A quantitative comparison of a response pattern obtained by computational micromechanics with that found only by mathematical morphology indicates that (i) the regions of plastic flow are very close to geodesics, and (ii) a purely geometric, and orders of magnitude more rapid than by computational mechanics assessment of these regions is possible.
Khdir, Younis Khalid. "Non-linear numerical homogenization : application to elasto-plastic materials." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10023/document.
Full textThis PhD dissertation deals with the numerical homogenization of heterogeneous elastic-plastic random media via large volume computations. The dissertation is presented in two main parts. The first part is dedicated to the effective elastic-plastic response of random two-phase composites stretched under uniaxial loading. The second part is focused on the effective yield response of random porous media over a wide range of stress triaxialities. In the first part, we describe a computational homogenization methodology to estimate the effective elastic-plastic response of random two-phase composite media. The method is based on finite element simulations using three-dimensional cubic cells of different size but smaller than the deterministic representative volume element of the microstructure. In the second part, we describe using the finite element method a computational homogenization study of three-dimensional cubic cells in order to estimate the effective yield surface of random porous media containing one or two populations of voids. The representativity of the overall yield surface estimates is examined using cubic cells containing randomly distributed and oriented spheroidal voids. The computational results are compared with some existing Gurson-type yield criteria
Kintzel, Olaf. "Modeling of elasto-plastic material behavior and ductile micropore damage of metallic materials at large deformations /." Bochum : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985340991.
Full textLhotellier, Frederic C. "Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/40934.
Full textThe matrix-fiber stress transfer in glass/epoxy composite materials was studied using analytical and experimental methods. The mathematical model that was developed calculates the stress fields in the fiber, interphase, and neighboring matrix near a fiber break. This scheme takes into account the elastic-plastic behavior of both the matrix and the interphase, and it includes the treatment of stress concentration near the discontinuities of the fibers. The radius of the fibers and the mechanical properties of the matrix were varied in order to validate the mathematical model. The computed values for the lengths of debonding, plastic deformation, and elastic deformation in the matrix near the fiber tip were confirmed by measurements taken under polarized light on loaded and unloaded single fiber samples. The fiber-fiber interaction was studied experimentally using dog-bone samples that contained seven fibers forming an hexagonal pattern.
Master of Science
Kintzel, Olaf [Verfasser]. "Modeling of elasto-plastic material behavior and ductile micropore damage of metallic materials at large deformations / Olaf Kintzel." Aachen : Shaker, 2007. http://d-nb.info/1166511863/34.
Full textZangmeister, Tobias [Verfasser], and Ralf [Akademischer Betreuer] Müller. "On the Extended Finite Element Method for the Elasto-Plastic Deformation of Heterogeneous Materials / Tobias Zangmeister. Betreuer: Ralf Müller." Kaiserslautern : Technische Universität Kaiserslautern, 2015. http://d-nb.info/1064868894/34.
Full textKintzel, Olaf [Verfasser], Günther [Gutachter] Meschke, Klaus [Gutachter] Hackl, and Mikhail [Gutachter] Itskov. "Modeling of elasto-plastic material behavior and ductile micropore damage of metallic materials at large deformations / Olaf Kintzel ; Gutachter: Günther Meschke, Klaus Hackl, Mikhail Itskov ; Fakultät für Bau- und Umweltingenieurwissenschaften." Bochum : Ruhr-Universität Bochum, 2007. http://d-nb.info/1231542071/34.
Full textSotolongo, Wilfredo. "On the numerical implementation of cyclic elasto-plastic material models." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/17594.
Full textWerner, Todd C. "Elasto-Plastic Impact of a Cantilever Beam Using Non-Linear Finite Elements and Event Simulation." Youngstown State University / OhioLINK, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=ysu997556281.
Full textJakel, Roland. "Lineare und nichtlineare Analyse hochdynamischer Einschlagvorgänge mit Creo Simulate und Abaqus/Explicit." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-171812.
Full textThe presentation describes how to analyze the impact of an idealized fragment into a stell protective panel with different dynamic analysis methods. Two different commercial Finite Element codes are used for this: a.) Creo Simulate: This code uses the method of modal superposition for analyzing the dynamic response of linear dynamic systems. Therefore, only modal damping and no contact can be used. The unknown force-vs.-time curve of the impact event cannot be computed, but must be assumed and applied as external force to the steel protective panel. As more dynamic the impact, as sooner the range of validity of the underlying linear model is left. b.) Abaqus/Explicit: This code uses a direct integration method for an incremental (step by step) solution of the underlying differential equation, which does not need a tangential stiffness matrix. In this way, matieral nonlinearities as well as contact can be obtained as one result of the FEM analysis. Even for extremely high-dynamic impacts, good results can be obtained. But, the nonlinear elasto-plastic material behavior with damage initiation and damage evolution must be characterized with a lot of effort. The principal difficulties of the material characterization are described
Gu, Tang. "Modélisation multi-échelles du comportement électrique et élasto-plastique de fils composites Cu-Nb nanostructurés et architecturés." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0017/document.
Full textNanostructured and architectured copper niobium composite wires are excellent candidates for the generation of intense pulsed magnetic fields (>90T) as they combine both high strength and high electrical conductivity. Multi-scaled Cu-Nb wires are fabricated by accumulative drawing and bundling (a severe plastic deformation technique), leading to a multiscale, architectured and nanostructured microstructure exhibiting a strong fiber crystallographic texture and elongated grain shapes along the wire axis. This thesis presents a comprehensive study of the effective electrical and elasto-plastic behavior of this composite material. It is divided into three parts: electrical, elastic and elasto-plastic multiscale modeling. In order to investigate the link between the effective material behavior and the wire microstructure, several homogenization methods are applied which can be separated into two main types: mean-field and full-field theories. As the specimens exhibit many characteristic scales, several scale transition steps are carried out iteratively from the grain scale to the macro-scale. The general agreement among the model responses allows suggesting the best strategy to estimate reliably the effective electrical and elasto-plastic behavior of Cu-Nb wires and save computational time. The electrical models are demonstrated to predict accurately the anisotropic experimental data. Moreover, the mechanical models are also validated by the available ex-situ and in-situ X-ray/neutron diffraction experimental data with a good agreement
Maddela, Naveen. "Finite Element Analysis of Railway Track Wooden Sleeper." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textKato, Motoki, 勉. 宇佐美, Tsutomu Usami, 昭. 葛西, Akira Kasai, and 基規 加藤. "座屈拘束ブレースの繰り返し弾塑性挙動に関する数値解析的研究." 土木学会, 2002. http://hdl.handle.net/2237/8463.
Full textSilva, Maurício de Carvalho. "Caracterização das propriedades mecânicas e metalúrgicas do aço API 5L X 80 e determinação experimental de curvas J-R para avaliação da tenacidade a fratura." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-11022005-162828/.
Full textAssessments of crack growth resistance in ductile materials play a key role in structural integrity procedures for high strength, low alloy (HSLA) pipeline steels commonly employed in gas and petroleum trasmission systems. This work presents an investigation of the ductile tearing properties for an API 5L X80 pipeline steel using experimentally measured crack growth resistance curves (J-R curves) for the material. Testing of the X80 pipeline steel employed compact tension (C(T)) fracture specimens to determine the J-R curves based upon the unloading compliance method using a single specimen technique in accordance with the ASTM E1820 standard procedure. The C(T) specimens have thickness B=15mm, width W=2B and a ratio between crack size (a) and width, a/W=0,6. The experimental tests utilized a 250 kN MTS universal machine. Conventional tensile tests were also performed to determine the tensile properties for the tested material: yield strength of 550MPa, tensile strength of 676MPa and elongation of 27% (gage length of 50 mm). The Charpy V-notch impact tests also provided and absorbed energy of 220J at 0ºC. The metallographic analysis showed colonies of perlite and MA constituent islands in a ferrite matrix. This experimental characterization provides additional toughness and mechanical data against which the general behavior of X80 class pipeline steel can be compared.
Taher, Bilal. "Analyse et modélisation de l'endommagement dû au couplage thermomécanique des multi-matériaux cylindriques." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2012. http://tel.archives-ouvertes.fr/tel-00977567.
Full textJakel, Roland. "Grundlagen der Elasto-Plastizität in Creo Simulate - Theorie und Anwendung." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87141.
Full textThis presentation describes the basics of elasto-plasticity and its application with the finite element software Creo Simulate (formerly Pro/MECHANICA) from PTC. The first part describes the characteristics of plastic behavior, different plastic material laws, yield criteria for multiaxial stress states and different hardening models. In the second part, the opportunities and limitations of analyzing elasto-plastic problems with the FEM-code are described and user information is provided. The last part finally presents different examples. Deeply treated is the behavior of a uniaxial tensile test specimen before and after elongation with necking appears
Raghavendra, Rao Arun. "A Unified Constitutive Model For Large Elasto-plastic Deformation." Thesis, 2007. http://hdl.handle.net/2005/570.
Full text"A Generalized Orthotropic Elasto-Plastic Material Model for Impact Analysis." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.40700.
Full textDissertation/Thesis
Doctoral Dissertation Civil and Environmental Engineering 2016
Kintzel, Olaf [Verfasser]. "Modeling of elasto-plastic material behavior and ductile micropore damage of metallic materials at large deformations / from Olaf Kintzel." 2006. http://d-nb.info/985340991/34.
Full text(13753927), S. Vijay Sundhar. "Endurance limit determination in porous materials." Thesis, 1992. https://figshare.com/articles/thesis/Endurance_limit_determination_in_porous_materials/21047392.
Full textThe theory describing the fatigue mechanism in elasto-plastic material containing pores or inclusions has been developed. An attempt at quantitative determination of the effect of endurance limit reduction by analysis of sizes of plastic zones formed near the inclusions, and their cracking has been -done. The geometrical configuration, consisting of round, horizontal, vertical and angular elliptical inclusions from which a nucleating crack emerged, was considered, and the stress intensity factory of such configurations was analysed. Based on threshold value of 6K below which crack propagation ceases, the critical value of loading stress was determined. Finite element technique was used to obtain theoretical results. A source code developed by Owen and Hinton for solving elastoplastic applications using finite element concept was used for solving the problem. Experimental analysis was done using photoelasticity method. Theoretical results were compared with results from experiments, showing quite good agreement.
"Micromechanical modeling of dual-phase elasto-plastic materials : influence of the morphological anisotropy, continuity and transformation of the phases." Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-02102005-162402/.
Full textKuo, Chia-Yuan, and 郭嘉源. "Development of Micro-indentation Test and the inverse computational Method for determination of the flow curve of elasto-plastic Materials." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/76155993612191354782.
Full text國立中正大學
機械系
92
Nowadays, it is a tendency to CAE application for the field of biomedicine. However, how to obtain the material properties and formulate the mathematical model is very important for CAE application in biomedicine problem. At present, the nano-indentation testing is the better method to get the material properties for the nonstandard specimen. However, this method could only measure the superficial properties of material. Therefore, it can’t behave primary properties of the material. So the micro-indentation testing that is used for measuring the Young’s modulus of the biomaterial will be developed in this thesis. The Young’s modulus of the articular cartilage is measured about 6.28MPa by this measurement. Using only the young’s modulus is not sufficient for CAE. Furthermore, the flow curve of elasto-plastic materials cannot be obtain by indentation directly. So the inverse computational method for determination of the flow curve of elasto-plastic Materials will be proposed in this thesis. This inverse method is developed based on the load-depth curve measured by continuous indentation test is set up through the FEM and the ANN. This method for bilinear model and multi-linear model has also been already successful established.
"Experimental Characterization and Finite Element Modeling of Composites to Support a Generalized Orthotropic Elasto-Plastic Damage Material Model for Impact Analysis." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.54798.
Full textDissertation/Thesis
Doctoral Dissertation Civil, Environmental and Sustainable Engineering 2019
Jain, Praveen Kumar. "Towards Measurement And Simulation Of Elasto-Plastic Deformation." Thesis, 2006. http://hdl.handle.net/2005/416.
Full textHu, Hsuan Chi, and 胡軒齊. "A Modified Dao’s Material Analysis Model and Its Application to the Study of Elasto-Plastic Properties of Intermetallic Compound." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/37885566938226641843.
Full text國立清華大學
動力機械工程學系
103
In the solder interconnect technology of flip chip bonding, a thin intermetallic compound layer is likely to form at the interface between solder bump and under bump metallurgy due to the constitutional chemical diffusion. Generally, the shear strength of the intermetallic compound is less than that of the solder. This would influence the drop impact reliability of the solder bump. In addition, as the thickness of intermetallic compound is up to a certain value, a high local stress would commonly occurred at the interface between intermetallic compound layer and its neighborhood, thereby leading to the crack formation and solder bump failure. Thus, it is essential to explore the mechanical property and behavior of intermetallic compound for improving the reliability of the solder bump. Up to date, though the mechanical properties, such as hardness and Young’s modulus, of the intermetallic compound can be measured through the nanoindentation, it is hard to accurately grasp the elasto-plastic behavior of intermetallic compound, i.e., strain hardening exponent and yield stress and, etc., due to the constrains of nano/micro samples fabrication of intermetallic compound and measurement technique. Therefore, the numerical calculation could be the alternative method, which is in replacement of experimental approach, to obtain the mechanical property and behavior of intermetallic compound. Though the Dao model can yield the elasto-plastic behavior, i.e., strain hardening exponent and yielding strength, of the material, whose Young’s modulus is in the range of 10~210 GPa. Nevertheless, the range of the Young’s modulus of the material investigated in the Dao model is extremely extensive. It would result in a lack of the data regarding to development of the Dao model, thereby resulting in a substantially error for Dao model in prediction of elasto-plastic behavior. This thesis constructed the material property and relationship of nanoindentation empiric parameter of the intermetallic compound (Young’s modulus is in the range of 60 ~ 200GPa) by mainly modifying the Dao model to further investigate the elasto-plastic behavior of intermetallic compound. According to the experimental and simulated results, the ratio of initial unloading stiffness and reduced young’s modulus of the intermetallic compound was not constant, and it would vary with different material. This thesis successfully established the relationship between the ratio and nanoindentation empiric parameter. Thus, the strain hardening exponent and yield stress of intermetallic compound were effectively evaluated. Finally, this thesis applied the modified Dao’s material analysis model together with Coffin-Manson fatigue life empiric formula to further investigate the elasto-plastic behavior effect of intermetallic compound on the reliability of SnAg solder bump of the high-density and ultra-fine-pitch 3D chip-on-chip stacking packaging under accelerated thermal cycling loading. The calculated results reveal that the accuracy of prediction of solder bump reliability can be significantly enhanced as the elasto-plastic behavior of the intermetallic compound is taken into account.
Agarwal, Karn. "Modeling fracture propagation in poorly consolidated sands." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3595.
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Muthukumar, R. "Effect Of Material Non-Linearity Of Adherends On Fracture Behaviour Of Bimaterial Interface Cracks." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1470.
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