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Dissertations / Theses on the topic 'Crack tip element'

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Published: 4 June 2021

Last updated: 4 February 2022

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1

Potirniche, Gabriel Petru. "FINITE ELEMENT MODELING OF CRACK TIP PLASTIC ANISOTROPY WITH APPLICATION TO SMALL FATIGUE CRACKS AND TEXTURED ALUMINUM ALLOYS." MSSTATE, 2003. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06242003-220551/.

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For the characterization of crack advance in mechanical components and specimens under monotonic and fatigue loading, many engineering approaches use the assumption that the plastic deformation at the crack tip is isotropic. There are situations when this assumption is not correct, and the modeling efforts require additional correction factors that account for this simplification. The goal of this work is to study two cases where the plastic anisotropy at the crack tip is predominant and influences the magnitude crack-tip parameters, which in turn determine the amount of crack advance under ap

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2

Karedla-Ravi, Shankar. "Modeling of crack tip high inertia zone in dynamic brittle fracture." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5783.

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A phenomenological cohesive term is proposed and added to an existing cohesive constitutive law (by Roy and Dodds) to model the crack tip high inertia region proposed by Gao. The new term is attributed to fracture mechanisms that result in high energy dissipation around the crack tip and is assumed to be a function of external energy per volume input into the system. Finite element analysis is performed on PMMA with constant velocity boundary conditions and mesh discretization based on the work of Xu and Needleman. The cohesive model with the proposed dissipative term is only applied in the hi

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3

Yu, LiJie. "A three-dimensional crack tip element for energy release rate determination and delamination growth prediction." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.

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4

Unosson, Mattias. "On failure modelling in finite element analysis : material imperfections and element erosion." Doctoral thesis, Linköping : Linköpings universitet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4679.

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5

Mikulik, Zoltan Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Application of fracture mechanics to predict the growth of single and multi-level delaminations and disbonds in composite structures." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2008. http://handle.unsw.edu.au/1959.4/41560.

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The high stiffness to weight ratio and fatigue resistance make carbon fibre composites suitable for both military and large civil aircraft. The limited ability of current numerical methods to capture the complex growth of damage in laminated composites leads to a conservative design approach applied in today??s composite aircraft structures. The aim of the presented research was to develop an improved methodology for the failure prediction of laminated composites containing delaminations located between arbitrary layers in the laminate, and to extend the investigations to composite structures

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6

Dharmawan, Ferry, and ferry dharmawan@rmit edu au. "The Structural Integrity And Damage Tolerance Of Composite T-Joints in Naval Vessels." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081216.163144.

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In this thesis, the application of composite materials for marine structures and specifically naval vessels has been explored by investigating its damage criticality. The use of composite materials for Mine Counter Measure Vessels (MCMVs) was desirable, especially for producing material characteristics, such as light weight, corrosion resistance, design flexibility due to its anisotropic nature and most importantly stealth capability. The T-Joint structure, as the primary connection between the hull and bulkhead forms the focus of this research. The aim of the research was to determine the met

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7

Mokashi, Prasad Shrikant. "Numerical modeling of homogeneous and bimaterial crack tip and interfacial cohesive zones with various traction-displacement laws." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180621217.

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8

Sun, Ta-chien. "Fundamental study of contact resistance behavior in RSW aluminum." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1069807481.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xxviii, 314 p.; also includes graphics (some col.) Includes bibliographical references (p. 303-314). Available online via OhioLINK's ETD Center

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9

來海, 博央, Hirohisa KIMACHI, 拓. 田中, Hiroshi TANAKA, 敏弘佐藤, Toshihiro SATOH, 啓介田中 та Keisuke TANAKA. "モードⅡ荷重を受ける長繊維強化複合材料の層間マトリックスき裂先端での塑性領域". 日本機械学会, 2000. http://hdl.handle.net/2237/9170.

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10

來海, 博央, Hirohisa KIMACHI, 拓. 田中, Hiroshi TANAKA, 敏弘佐藤, Toshihiro SATOH, 啓介田中 та Keisuke TANAKA. "モードⅠき裂を有する長繊維強化複合材料における塑性領域の弾塑性有限要素法解析". 日本機械学会, 2000. http://hdl.handle.net/2237/9173.

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11

Schultheisz, Carl R. Knauss Wolfgang Gustav Knauss Wolfgang Gustav. "Comparison of experimental and computational crack-tip deformations using Moire interferometry and finite elements /." Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-07122007-132245.

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12

Žák, Stanislav. "Popis napjatosti a deformace na čele trhlin zatížených ve smykových zátěžných módech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231475.

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The main goal of this work is the comparison of the size of the plastic zone at the crack tip for two analysis methods: an analytical linear method and an elastic-plastic analysis employing the Finite Element method (ANSYS software). All calculations were made for a crack loaded under pure shear modes. These types of loading are not sufficiently described in the literature. The first part of this work introduces the problem with the crack tip plastic zone using both linear and nonlinear fracture parameters. The second part is dedicated to the construction of the Finite Element model in the ANS

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13

Ellis, Brian. "A real-time hybrid method based on blade tip timing for diagnostics and prognostics of cracks in turbomachine rotor blades." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/73315.

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This dissertation proposes hybrid models for (i) diagnosis and (ii) remaining useful life estimation of a single fatigue crack in a low-pressure turbine blade. The proposed hybrid methods consist of physics-based methods and data-driven methods. In this dissertation, blade tip timing is used to measure the relative tip displacement of a rotor blade. The natural frequency of the blade is determined by detecting the critical speeds of the blade using a newly derived least squares spectral analysis method. The method shares its origin from the Lomb-Scargle periodogram and can detect resonance fr

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14

Gbetchi, Kokouvi. "Multi-scale modeling of thermo-mechanical dynamic damage in quasi-brittle materials." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0049.

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Sous l’effet des impacts mécaniques, les structures constituées de matériaux fragiles peuvent être exposés à la rupture dynamique. La modélisation appropriée des mécanismes de rupture à différentes échelles d’observation et la prédiction de l’endommagement thermomécanique dans ces matériaux sont essentielles pour la conception de structures fiables. Des observations expérimentales sur la rupture dynamique des matériaux fragiles montrent des effets de refroidissement et d’échauffement importants à proximité d’une pointe de fissure. La modélisation du couplage thermomécanique lors de la rupture

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15

Huang, Chunta, and 黃俊達. "Special Crack Tip Elements for Finite Element Analysis of Interface Cracks." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/99192490123564703233.

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碩士<br>淡江大學<br>機械工程學系<br>89<br>In this thesis a special crack tip element has been developed in which displacements and stresses have same behavior as those of bi-material interface cracks with open tips. As the crack is along an interface of materials with identical elastic moduli, the element degenerates into a traditional quarter point element. By using the isoparametric coordinate system specified in this thesis, element stiffness matrices may be easily calculated. Also, it is shown in this study the complex may be obtained. Numerical results are in good agreement with known analytical

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16

Han, Bo Nied Herman F. "Development of three-dimensional enriched crack tip finite element for linear poroelastic materials." 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1469564.

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17

Lin, Yuan-Fu, and 林源富. "The use of higher order element to solve the crack tip stress intensity factor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/zeqsqq.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>90<br>Abstract The purpose of this research is to study the effect of higher order elements in solving the crack tip stress intensity factor (SIF), and to compare the results with those obtained by using the singular elements. We also study the positions of the superconvergent points as well as the method of static condensation beforehand. In energy norm,the n-th order Lagrange elements have the superconvergent rate with the order of n+1,and their locations are on n by n Gauss integration points. The accuracy and convergent rate of the Lagrange elements are bett

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18

Hsin-HsiangHsu and 許信翔. "Study on Stress Field Near the Notch and Crack Tip Solved by Element-Free Method." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/68040957451725100331.

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博士<br>國立成功大學<br>土木工程學系<br>103<br>Generally speaking, the stress in crack and notch tip will produce infinitely great phenomenon. For the two-dimensional crack and notch problems, stress near the crack and notch tip can solved exactly by the theoretical analysis, but for the three-dimensional crack and notch ones, for example a plate with a notch, there is no rational solutions at present. In this thesis, the element-free method will be used to solve the mechanics problem of crack and notch, and the main reason is that the element-free method can add stress and strain functions in the strength

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19

Tandaiya, Parag Umashankar. "Finite Element And Experimental Studies On Fracture Behavior Of Bulk Metallic Glasses." Thesis, 2009. http://hdl.handle.net/2005/1013.

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The objective of this thesis is to study the fracture behavior of bulk metallic glasses. For this purpose, detailed finite element investigation of the mode I and mixed mode (I and II) stationary crack tip fields under plane strain, small scale yielding conditions is carried out. An implicit backward Euler finite element implementation of the Anand and Su constitutive model [Anand, L. and Su, C., 2005, J. Mech. Phys. Solids 53, 1362] is used in the simulations. The effects of internal friction (μ), strain softening, Poisson's ratio (ν) and elastic mode mixity (Me) on the near-tip stress and de

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20

Schultheisz, Carl R. "Comparison of experimental and computational crack-tip deformations using Moire interferometry and finite elements." Thesis, 1991. https://thesis.library.caltech.edu/2862/1/Schultheisz_cr_1991.pdf.

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The large plastic deformations at the tip of a crack in a ductile heat treatment of 4340 steel are studied experimentally and numerically to investigate the details of the deformation in a tough material. The specimen is loaded in a three-point-bend arrangement. The finite-element model of the experiment uses a small-strain, incremental plasticity law, with a power-law hardening behavior. Both the in-plane and out-of-plane deformations were measured on the same specimen at the same time. The experimental technique of moire interferometry is used to measure the in-plane displacements. This tec

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21

Nadimpalli, Siva. "Characterization and Prediction of Fracture within Solder Joints and Circuit Boards." Thesis, 2011. http://hdl.handle.net/1807/29822.

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Double cantilever beam (DCB) specimens with distinct intermetallic microstructures and different geometries were fractured under different mode ratios of loading, ψ, to obtain critical strain energy release rate, Jc. The strain energy release rate at crack initiation, Jci, increased with phase angle, ψ, but remained unaffected by the joint geometry. However, the steady-state energy release rate, Jcs, increased with the solder layer thickness. Also, both the Jci and Jcs decreased with the thickness of the intermetallic compound layer. Next, mode I and mixed-mode fracture tests were performed

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