Дисертації з теми "Compression and Indentation testing"
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Shirmohammadi, Maryam. "Process modelling and simulation of tissue damage during mechanical peeling of pumpkin as a tough skinned vegetable." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/67921/1/Maryam_Shirmohammadi_Thesis.pdf.
Повний текст джерелаPour, Shahid Saeed Abadi Parisa. "Mechanical behavior of carbon nanotube forests under compressive loading." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47699.
Повний текст джерелаXia, Yang. "A robust statistical method for determining material properties and indentation size effect using instrumented indentation testing." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP1982/document.
Повний текст джерелаInstrumented indentation is a practical and powerful tool for probing the mechanical properties of materials at small scales. However, several errors (surface roughness, indentation size effect, determination of first contact point, etc…) affect the instrumented indentation testing (e.g. the low reproducibility of the indentation curves) and lead to inaccuracies in the determination of mechanical properties of materials analyzed. An original approach is developed in this thesis for the accurate characterization of the mechanical properties of materials. This approach is established by a statistical analysis of the indentation curves with taking account of error in determining the first contact point and effects of the surface roughness. This approach is basing on a minimization of the distance (defined as the initial contact depth error) between the experimental indentation curves and the ones simulated with Bernhard’s model in order to generate a “unique” representative curve which enables to represent all the experimental curves. The proposed method permits to calculate the macro-hardness and the Young’s modulus of materials from this representative curve with the consideration of the errors due to the surface roughness and the indentation size effect for shallow penetration. The robustness of the method is proved by its application to different groups of specimens, i.e. different materials with various mechanical properties, different surface preparation methods (polishing, sandblasting) and different indenter tips to generate different states of local stresses. A quantitative link between the surface roughness and the standard deviation of initial contact depth error is established by a multi-scale surface roughness analyzing. The proposed method enables to characterize the mechanical properties of materials without resorting to the surface preparation which may potentially alter its properties (e.g. generation of residual stresses, surface contamination ...)
Koray, Erge. "Numerical And Experimental Analysis Of Indentation." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12605953/index.pdf.
Повний текст джерелаnumerical and experimental investigation of the force-indentation measurements is presented. For indentation tests on anisotropic metals, a novel indenter which is not self similar is used with three transducers to measure the displacements. It is seen that in order to have high repeatability and accuracy at the tests, workpiece and indenter parameters have crucial importance. These parameters in the indentations are analyzed by finite element methods. Ideal dimensions of the workpiece are determined. It is shown that plane strain conditions can only be achieved by embedded indentations. Effect of surface quality and clamping on repeatability are investigated. It is shown that surface treatments have significant effects on the results. Also it is seen that clamping increases the repeatability drastically. Moreover, indentation tests are conducted to verify the results of numerical simulations. Effect of anisotropy on the force-displacement curves is clearly observed.
Dhaigude, Mayuresh Mukund. "Anvil effect in spherical indentation testing on sheet metal." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1818.
Повний текст джерелаVadlakonda, Suman. "Indentation induced deformation in metallic materials." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc4904/.
Повний текст джерелаHong, Edwin S. "Group testing for image compression /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6900.
Повний текст джерелаWang, Yan, and 王焱. "Hertzian indentation failure of dental restorative materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36528067.
Повний текст джерелаTuck, Jonathan R. "Indentation characterisation for design of coated systems." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364800.
Повний текст джерелаMonelli, Bernardo Disma. "Mechanical Characterization of Metallic Materials by Instrumented Spherical Indentation Testing." Doctoral thesis, Università degli studi di Trento, 2010. https://hdl.handle.net/11572/368675.
Повний текст джерелаMonelli, Bernardo Disma. "Mechanical Characterization of Metallic Materials by Instrumented Spherical Indentation Testing." Doctoral thesis, University of Trento, 2010. http://eprints-phd.biblio.unitn.it/436/1/Bernardo-Monelli_PhD.pdf.
Повний текст джерелаLin, Shiann. "Crack analysis by distributed strain nuclei with application to indentation testing." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339286.
Повний текст джерелаPoolthong, Suchit. "Determination Of The Mechanical Properties Of Enamel Dentine And Cementum By An Ultra Micro-Indentation System." Thesis, The University of Sydney, 1998. http://hdl.handle.net/2123/4963.
Повний текст джерелаMahawish, Ali Hassan. "Axisymmetric compression testing of concrete by nitrogen." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316326.
Повний текст джерелаSjöstrand, Björn. "Evaluation of Compression Testing and Compression Failure Modes of Paperboard : Video analysis of paperboard during short-span compression and the suitability of short- and long-span compression testing of paperboard." Thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper (from 2013), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-27519.
Повний текст джерелаTotty, Jennifer L. "Linear cellular copper in bending, compression and shear." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16913.
Повний текст джерелаLohonka, Radek. "Plasticity of the compound semiconductors at low temperatures : modelling of the uniaxial compression and indentation tests." Toulouse, INSA, 2002. http://www.theses.fr/2002ISAT0013.
Повний текст джерелаThis thesis deals with the plastic behaviour of compound semiconductors in the low temperature--high stress regime. Compressive stress-strain curves are calculated with models based on the formalisms of Alexander-Haasen or Schoeck extended to include simple glide/multiglide and one/three types of perfect dislocations with different mobilities. The impossibility to describe the crystal plasticity below some temperature with the available dislocation velocities data suggests a change in the controlling microscopic mechanisms. The negative photoplastic effect in GaAs is simulated. Modelling the response of the crystal to Vickers indentation is performed using elastic analytical expressions for the stress tensor: the stress distribution can be considered as nearly spherical although the plastic zone is far from it. Early stages of the formation of the plastic zone are described with the continuum crystal plasticity theory implementing the constitutive laws into the finite element method
Koka, Exaud Noe. "Laterally loaded wood compression members : finite element and reliability analysis." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26709.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
McNaughton, Adam L. "High Temperature Compression Testing of Monolithic Silicon Carbide (SiC)." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/McNaughtonAL2007.pdf.
Повний текст джерелаMata, Martha Patricia Guerrero. "Finite element modelling of hot plane strain compression testing." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245644.
Повний текст джерелаStander, Melchior. "Development of an intermediate strain rate compression testing machine." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9131.
Повний текст джерелаThe further development of the wedge bar Intermediate Strain rate Tester (IST) presented by Cloete and Oxtoby [1] is presented in this dissertation. The concept uses a wedge mechanism to deform 5 mm diameter, 5 mm long specimens at strain rates in the region of 10 s, up to strains of 30. As impact principles are used to start and stop the experiment, it takes less than 1 of the testing duration to reach testing speed and to stop the experiment. The kinetic energy stored in the wedge bar helps ensure a near constant loading rate over the duration of the experiment. The yield stress is captured at above 80 of the average strain rate for the experiment for most of the materials investigated. The design work focuses primarily around the design of the new load-frame, load-cell, loading platforms and wedge bar displacement sensor. Finite Element Analysis (FEA) was used to investigate the dynamic response of the IST and modify the design of components where necessary. The modifications made the load-frame and load-cell result in a significant improvement in the quality of the measured signals. The wedge bar displacement sensor performed well. The back pressure driven loading concept shows potential but needs more development before it is suitable for routine testing. A range of common engineering materials was tested at quasi static, intermediate and high strain rates and compared to the results found in the literature. The results match well, however, friction effects dominate the large strain response of the metal specimens. In its current configuration the IST is used effective for testing polymers up to large strains as well as yield stress and small strain measurement of metals. For materials for which specimen friction effects are a problem, interrupted tests can be used to extend the maximum strain achievable.
Lam, Hung-yiu. "Pulse compression filter design for ultrasonic non-destructive testing /." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18933580.
Повний текст джерелаLin, Xin-Yu. "Lossless image compression for aerospace non-destructive testing applications." Thesis, University of Central Lancashire, 2004. http://clok.uclan.ac.uk/18830/.
Повний текст джерелаIbrahim, Nidal. "Caractérisation des propriétés mécaniques des géomatériaux par technique de micro indentation." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10048/document.
Повний текст джерелаThe technology of micro indentation is one of the techniques ofmateriaJ characterization (by using small specimens) in various fields (mechanical engineering, civil engineering, oil industry, and pharmaceutical industry). Its main advantage lies in a certain number of practical requirements as regards the solution to the problem of small specimens. The present study is devoted the characterization of the mechanical properties of geomaterials, especially rocks involved in petroleum engineering. After having presented the methodology of the indentation test for isotropic rocks, we developed a semi-analytical method based on the use of Green function to characterize transverse isotropic rocks (five elastic parameters of these rocks). The influence of the various loadings (mechanical, thermal, hydrous) on the rock mechanics properties was studied by using the technology of micro indentation and the methodology proposed for isotropic transverse were used. Moreover, we characterize the failure parameters (C and f) by a combined approach of the indentation test and a test of micro compression (MCS) carried out the indentation device. Finally, we use inverse analysis in order to identify the parameters of a Drucker Prager mode!. ln the absence of a direct solution of the problem of indentation (in plastic regime), we had recourse to a numerical modelling by a finite element code (ABAQUS) to determine the calculated curve of indentation. This determination appeared completely convincing and moreover was validated by a simulation of triaxial compression tests on the same material
Lesko, John James. "Indentation testing of composite materials : a novel approach to measuring interfacial characteristics and engineering properties /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03172010-020329/.
Повний текст джерелаLesko, John J. "Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41677.
Повний текст джерелаMaster of Science
董旭東 and Xudong Dong. "Stress distribution and failure mode of dental ceramic structures under Hertzian indentation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31241621.
Повний текст джерелаCzerepinski, Przemyslaw Jan. "Displaced frame difference coding for video compression." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267009.
Повний текст джерелаPatel, Chaitanya I. "Design and characterization of direct compression excipients." Thesis, University of Bath, 1986. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370466.
Повний текст джерелаSyed, Asif S. A. "Time dependent micro deformation of materials." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362108.
Повний текст джерелаLi, S. "Experimental testing and numerical investigation of materials with embedded systems during indentation and complex loading conditions." Thesis, Liverpool John Moores University, 2018. http://researchonline.ljmu.ac.uk/8981/.
Повний текст джерела林鴻耀 and Hung-yiu Lam. "Pulse compression filter design for ultrasonic non-destructivetesting." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B3121423X.
Повний текст джерелаGardner, Kevin Alexander. "Experimental Techniques for Shear Testing of Thin Sheet Metals and Compression Testing at Intermediate Strain Rates." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366199322.
Повний текст джерелаKassou, Belynda. "Mécanique des lits de silices granulaires pour l’optimisation des cœurs de panneaux isolants sous vide (PIV)." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI007/document.
Повний текст джерелаBuildings account for almost the half of the total energy consumption (60% for heating and cooling) and CO2 emissions in Europe. Thus, the control of energy consumption in building appears as critical. In that perspective, "super-thermal insulating" materials such as vacuum insulation panels (VIP) are promising, both for buildings renovation, and for new energy-efficient constructions. A VIP is composed by a sealed core material in which vacuum is established. The core is made of an open nanoporous stack of silica powders with very high porosity (> 90%) and very fine porous structure (< 200 nm). Two types of silica are typically used: first fumed silica (FS) which enable to process panels with a sufficient compression strength for handling for a density as low as 160 kg/m3, second precipitated silica (PS) which enable to process denser panels with a minimal density of about 250 kg/m3. VIPs made of FS powders are more efficient in terms of thermal and mechanical properties as compared of VIP made of PS powders. However, their price is higher. This study aims at understanding the differences in mechanical properties noted between compacted FS and PS powders. Oedometric compression tests and spherical indentation test were carried out on compacts of Konasil 200 FS silica and on compacts of Tixosil 43 and 365 PS silica. In addition, structural observations of the powders were made using transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). These results permit to identify the parameters leading differences between FS and PS powders. Thus, surface chemistry, multiscale organization and interactions forces are highlighted to explain the differences in mechanical properties between compacts of FS and PS silica
Kittang, Lars Oskar Osnes. "Development and testing of a Linnik Interference Microscope for Sub-surface Inspection of Silicon during moving Indentation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19258.
Повний текст джерелаToledo, García Gustavo A. "High temperature compression testing of hardened steels for plasticity behavior modeling." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16909.
Повний текст джерелаThompson, Luke Francis. "Through-thickness compression testing and theory of carbon fibre composite materials." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/throughthickness-compression-testing-and-theory-of-carbon-fibre-composite-materials(02ad7cfa-b779-4e69-9361-3c5bb44c6114).html.
Повний текст джерелаHongkarnjanakul, Natthawat. "Modélisation numérique pour la tolérance aux dommages d’impact sur stratifié composite : de l’impact à la résistance résiduelle en compression." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0037/document.
Повний текст джерелаImpacts on composite structures can greatly reduce their residual strength without leaving a visible mark on the outer surface. In aeronautics, a minimum detection threshold of the impact damage is defined, based on the permanent indentation left after impact. Below this threshold, the structure must withstand a defined load: it is the notion of impact damage tolerance. The numerical design of a composite structure taking into account aspects such as detectability and damage tolerance thus requires to know how to represent impact, permanent indentation and residual strength under compression.This work focuses on the numerical modeling of composite laminates made of unidirectional plies. The objective is to develop a predictive model of post-impact residual strength. An experimental study was conducted to investigate the damage scenario during impact and compression after impact (CAI), and provide experimental data to validate the simulations.A finite element modeling with a Discrete Ply Model (DPM) approach is performed based on previous work done at the laboratory. The impact model is improved and validated on different stacking sequences to ensure the robustness of the model. Specific three-point bending tests are performed to have a better understanding of the formation of permanent indentation. A new model of permanent indentation is then proposed and applied in the impact model. Finally, a model is built to predict CAI residual strength. The three steps: impact, indentation and CAI are combined into a single model
Mirzadeh, Farshad. "Compressive strength and behavior of 8H C3000/PMR15 woven composite material." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54337.
Повний текст джерелаPh. D.
Sylvain, Wilgens. "Étude de la plasticité du monocristal de phase MAX par déformation aux petites échelles." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2307/document.
Повний текст джерелаThe thesis's goal is to study the deformation, at microscopic scale, of the MAX phase Ti2AlN synthesized by powder metallurgy. This work is divided into three parts: in the first part, the interest has been put on the hysteretic behavior of the MAX phases via cyclic mechanical solicitations, during spherical indentation tests and ex-situ compression of micro-pillars, on differently orientated grains beforehand determined by EBSD. In the second part, we were interested into the micro-pillar's deformation via insitu cyclic compression tests coupled with Laue micro-diffraction. The goal was to analyse the evolution diffraction lines during the pillar's deformation in order to highlight the elementary deformation mechanisms and to observe the finale structures via the post-mortem SEM imaging of the pillars. Finally, a last part was devoted to study the deformation mechanisms in temperature at microscopic scale via nano-indentation tests up to 800°C. The characterization of the slip lines on the surface has been revealed by AFM and that of t he microstructural configurations (dislocations) under the indent has been done by TEM. All data collected by these various tests at the small scales have refined our understanding of the deformation mechanisms of crystal MAX phase, particularly with respect to the models usually proposed in the literature
Heatwole, Edwin L. "Allowable bending strength enhancement of 2 by 4 lumber by tension and compression proofloading." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53718.
Повний текст джерелаMaster of Science
St, John Ashlee Nicole. "Compression effects on the phase behavior of microgel assemblies." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22666.
Повний текст джерелаCommittee Chair: Lyon, L. Andrew; Committee Member: Breedveld, Victor; Committee Member: Hernandez, Rigoberto; Committee Member: Srininvasarao, Mohan; Committee Member: Weeks, Eric R.
Siradj, Eddy Sumarno. "Strain induced precipitation kinetics of Nb(Cn) in Nb-HSLA steel as a function of thermomechanical history." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264438.
Повний текст джерелаBeegan, Andrew Peter. "Wavelet-based Image Compression Using Human Visual System Models." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32939.
Повний текст джерелаMaster of Science
Mihajlovic, Bojan. "Compression and security platform for the testing of wireless sensor network nodes." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18820.
Повний текст джерелаCette thèse étudie le test sur le terrain de noeuds de résaux de senseurs sans-fil (RSSF) afin d'obtenir un temps de vie accru. De tels noeuds opeèrent avec des limites strictes en énergie, cot, puissance en travail, et sont sensibles d'être attaqués. Alors que l'auto-test basé en logiciel (ATBL) a ses avantages sur des noeuds RSSF, l'efficacité en énergie peut être améliorée en comprimant les programes ATBL avant de les distribuer. Une parmi plusieurs méthodes de compression étudiées pour la tâche, l'algorithme BSTW avec codage Rice démontre des économies d'énergie, tout en nécessitant une faible quantité de mémoire et de bons ratios de compression. La sécurité du test est assurée à travers une approche à plusieurs niveaux qui utilise une puce émetteur-récepteur sans-fil sur lequel décharger les fonctions cryptographiques AES. Toute l'approche concernant la sécurité ne rajoute qu'un 2.5 pourcent de besoin en énergie pour la distribution du programme ATBL. Finalement, le protocol de test est créé pour combiner des commandes de test de haut niveau avec des méthodes de compression et de sécurité.
Valero, Diana (Diana E. ). "Compression testing and measurement of material properties of a double network hydrogel." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98758.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (page 26).
Double network hydrogel samples were synthesized and manufactured out of polyacrylamide (PAAm) and alginate solutions. They were casted into cube molds with each side measuring 20 mm. Samples were tested under compressive loads in cyclic compression tests and stress relaxation tests. A viscoelastic model was applied and material properties were calculated using the experimental data. The elastic modulus of these PAAm-alginate gels was found to be 35kPa, while the viscosity, [eta], was found to be 1.43 kPa-s. The viscous response was found to have a dependency on the strain rate by an exponential factor of 0.26. Using the applied theoretical model and the experimentally determined material properties, you can then characterize the mechanical response of the PAAm-alginate hydrogel when it undergoes small strains.
by Diana Valero.
S.B.
Forrester, Hsuan-Hsiou. "High strain rate compression testing of polymers : PTFE, PCTFE, PVC and PMMA." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13624.
Повний текст джерелаWilson, Keith. "A review of compression testing procedure with reference to a Trenton limestone /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=47028.
Повний текст джерелаGalatanu, Anca Daniela. "Behaviour and design of hollow flange beams under axial compression." Thesis, Queensland University of Technology, 1997. https://eprints.qut.edu.au/36012/1/36012_Galatanu_1997.pdf.
Повний текст джерелаJaramillo, Fulvio E. "Axially loaded stainless steel compression members." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07102006-144943/.
Повний текст джерелаLeroy Z. Emkin, Committee Member ; Lawrence F. Kahn, Committee Member ; Abdul-Hamid Zureick, Committee Chair.