Dissertations / Theses: 'Structural analysis (Engineering) Finite strip method'

1

江傑新 and Jackson Kong. "Analysis of plate-type structures by finite strip, finite prism and finite layer methods." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31233594.

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Kong, Jackson. "Analysis of plate-type structures by finite strip, finite prism and finite layer methods /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13788048.

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3

Walker, B. D. "A combined finite strip/finite element method for the analysis of partially prismatic thin-walled structures." Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375679.

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4

李華煜 and Wah-yuk Li. "Spline finite strip analysis of arbitrarily shaped plates and shells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231287.

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5

Li, Wah-yuk. "Spline finite strip analysis of arbitrarily shaped plates and shells /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12350758.

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6

Shen, Zhenyuan. "An integrated finite strip solution for long span bridges /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202009%20SHEN.

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7

Te, Seng-Bee. "Shear wall-frame interaction analysis using finite strip and continuum methods." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316508.

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8

李鷹 and Ying Li. "The U-transformation and the Hamiltonian techniques for the finite strip method." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235037.

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9

Li, Ying. "The U-transformation and the Hamiltonian techniques for the finite strip method /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18062052.

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10

Abayakoon, Sarath Bandara Samarasinghe. "Large deflection elastic-plastic analysis of plate structures by the finite strip method." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26946.

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A solution procedure based on the finite strip method is presented herein, for the analysis of plate systems exhibiting geometric and material non-linearities. Special emphasis is given to the particular problem of rectangular plates with stiffeners running in a direction parallel to one side of the plate. The finite strip method is selected for the analysis as the geometry of the problem is well suited for the application of this method and also as the problem is too complicated to solve analytically. Large deflection effects are included in the present study, by taking first, order non-linearities in strain-displacement relations into account. Material non-linearities are handled by following von-Mises yield criterion and associated flow rule. A bi-linear stress-strain relationship is assumed for the plate material, if tested under uniaxial conditions. Numerical integration of virtual work equations is performed by employing Gauss quadrature. The number of integration points required in a given direction is determined either by observing the individual terms to be integrated or by previous experience. The final set of non-linear equations is solved via a Newton-Raphson iterative scheme, starting with the linear solution. Numerical investigations are carried out by applying the finite strip computer programme to analyse uniformly loaded rectangular and I beams with both simply supported and clamped ends. Displacements, stresses and moments along the beam are compared with analytical solutions in linear analyses and with finite element solutions in non-linear analyses. Investigations are also extended to determine the response of laterally loaded square plates with simply supported and clamped boundaries. Finally, a uniformly loaded stiffened panel is analysed and the results are compared with finite element results. It was revealed that a single mode in the strip direction was sufficient to yield engineering accuracy for design purposes, with most problems.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate

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11

Ali, Abdulkarim Hassan. "Dynamic analysis of bridges using the finite strip method." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/NQ57016.pdf.

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12

Song, Zhaobin. "Fracture analysis of bridges by spline finite strip method." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29168.

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The primary objective of this thesis is to develop crack strip method and verify the convergency of the method, finally to perform fracture analysis of bridge structures using spline finite strip method. In this thesis, combining the shape function of spline finite strip with the eigenfunction expansions at a crack tip, three types of crack strips, namely anti-plane shear crack strip, plane crack strip and bending crack strip, have been developed, in which cracks are perpendicular to the longitudinal axis of strips and the stress intensity factors can be computed directly. Based on plane crack strips and bending crack strips, the flat shell crack strip is developed for the fracture analysis of box girder bridges. Several case studies have demonstrated the satisfactory convergence of the proposed method. The fracture analysis of different types of bridges have been successfully conducted using these crack strips. In Chapter 3, the basic model of the crack strip is farmed. Substructure technique and extra knots are employed to enhance the efficiency and the convergence of this model. Two Gaussian quadratures for improper integrals are introduced to calculate the singular integral in the crack strip. The efficiencies of these two methods are compared through case studies. On the basis of anti-plane eigenfunction expansion derived by Tilley (1978), plane eigenfunction expansion by Williams (1957) and bending eigenfunction expansion by Williams (1961) in the area around the crack tip, anti-plane shear crack strip, plane crack strip and bending crack strip are developed in Chapter 4 to 6, respectively. The convergence of the proposed models is generally good as shown by case studies. In Chapter 7, these crack strip models are applied to the fracture analysis of bridge structures. Based on the plane crack strip and the bending crack strip, flat shell crack strip is formed for the fracture analysis of box girder bridges. The fracture analysis of different types of bridges, such as slab bridge, continuous slab bridge, single - cell box girder bridge and continuous bridge with top-open box girder, are successfully conducted using these crack strips. The leading diagonal terms are replaced by large numbers to deal with those restraints in the continuous bridges. The present method, i.e., combining the spline finite strip method with the analytical solution for the area around crack tip, provides a new and efficient approach for fracture analysis of structures, especially for the fracture analysis of bridge structures.

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13

Khong, Poh Wah. "Development of a microcomputer finite strip analysis for thin walled structures." Thesis, University of Strathclyde, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314703.

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14

Chen, Xie. "Analysis of the arbitrary Mindlin plate by spline finite strip method." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6577.

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15

Badawi, Mohammed Moulham. "Development of the P-version finite strip method for geometrically non-linear structures." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255241.

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16

Lin, Zhuhai. "Application of non-linear finite strip method to concrete structures and test on damaged beams." Thesis, London South Bank University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262361.

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17

Wong, Sze-chun, and 黃仕進. "Two level finite element method for structural analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B30425918.

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Wong, Sze-chun. "Two level finite element method for structural analysis /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12430869.

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19

朱達善 and Dashan Zhu. "Nonlinear static and dynamic analysis of plates & shells by spline finite strip method." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231743.

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Zhu, Dashan. "Nonlinear static and dynamic analysis of plates & shells by spline finite strip method /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12427020.

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21

Weber, Marc Anton. "Stochastic structural analysis of engineering components using the finite element method." Doctoral thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/8476.

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Bibliography: p. 113-123.
This thesis investigates probabilistic and stochastic methods for structural analysis which can be integrated into existing, commercially available finite element programs. It develops general probabilistic finite element routines which can be implemented within deterministic finite element programs without requiring major code development. These routines are implemented in the general purpose finite element program ABAQUS through its user element subroutine facility and two probabilistic finite elements are developed: a three-dimensional beam element limited to linear material behaviour and a two-dimensional plane element involving elastic-plastic material behaviour. The plane element incorporates plane strain, plane stress and axisymmetric formulations. The numerical accuracy and robustness of the routines are verified and application of the probabilistic finite element method is illustrated in two case studies, one involving a four-story, two-bay frame structure, the other a reactor pressure vessel nozzle. The probabilistic finite element routines developed in this thesis integrate point estimate methods and mean value first order methods within the same program. Both methods require a systematic sequence involving the perturbation of the random parameters to be evaluated, although the perturbation sequence of the methods differ. It is shown that computer-time saving techniques such as Taylor series and iterative perturbation schemes, developed for mean value based methods, can also be used to solve point estimate method problems. These efficient techniques are limited to linear problems; nonlinear problems must use full perturbation schemes. Finally, it is shown that all these probabilistic methods and perturbation schemes can be integrated within one program and can follow many of the existing deterministic program structures and subroutines. An overall strategy for converting deterministic finite element programs to probabilistic finite element programs is outlined.

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22

Li, S. L. "Stress analysis in two dimensions by a 'mixed' finite element method." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233358.

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The development of mixed and hybrid models provides viable alternatives in finite element structural analysis which overcome the shortcomings of conventional displacement and force methods. In this thesis, a mixed triangular finite element model in two-dimensional stress analysis is studied. The mixed finite element model has several features which are distinct from those of conventional methods: (i) the use only of mid-side nodes; (ii) a global coordinate system is not required; (iii) nodal variables include both forces and displacements; (iv) the element matrix consists of a mixture of stiffness, flexibility, equilibrium and compatibility coefficients; (v) the ability to deal with incompressible materials; (vi) internal equilibrium and compatibility are satisfied; (vii) the entire stress field of the assembled structure is in equilibrium; (viii) formulation of element equations is not based on an extremum principle. The derivation of element matrix equations for small-strain, small-displacement linear-elastic analysis is discussed and a scheme for assmebling the final set of algebraic equations is presented. Accurate and balanced results for both stress and displacement are obtained for a number of problems in plane elasticity including thermal strain and body-force problems. The ability of the mixed element to deal with incompressible materials makes it useful for the computation of collapse loads in elastic-perfectly plastic analysis, for example in undrained soil mechanics problems. Ideal plastic behaviour is approximated by the use of an extremely soft incompressible material. This approximation enables an incremental plastic stress-strain matrix to be written down, relating a plastic strain-increment to an imposed stress-increment in the ideal plastic range. The performance of the mixed element in elastic-perfectly plastic analysis is studied and numerical results are compared with those obtained by analytical techniques and the displacement finite element method. The use only of mid-side nodes in the mixed model has the advantage that a global coordinate system is not required in the analysis. This makes it relatively simple to follow the behaviour of structures in large-deflection problems. Examples are studied to investigate how the mixed element works in small-strain, large-deflection problems.

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23

Geyer, Susanna Elizabeth. "Advanced low order orthotropic finite element formulations." Diss., Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-03062006-114313/.

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24

Ghurbal, Ehsan. "Un-weighted multi-criteria mesh and structural optimisation method with finite element analysis." Thesis, University of Huddersfield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273718.

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25

Kissil, Andrew 1958. "A RULE-BASED FINITE ELEMENT MODELING SYSTEM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276395.

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26

Madapur, Uma. "Integrated structural analysis and design using 3-D finite elements." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43407.

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When structural analysis is performed via iterative solution technique it is possible to integrate the analysis and design iterations in an integrated analysis and design procedure. The present work seeks to apply an integrated analysis and design approach due to Rizk to the problem of hole shape optimization in thick plates.

The plates are modeled by three dimensional eight noded elements. An element by element (EBE) preconditioned conjugate gradient (PCG) method is used for the structural analysis, because this method is well suited for poorly banded three dimensional problems. The plates were optimized so as to minimize the stress concentration near the hole measured by the ratio of the Von Mises stress to the applied boundary stress. The analysis program was validated by comparision to a commercial finite-element program as well as photoelastically obtained stress concentrations. Similarly, the optinlization procedure was checked against plates optimized by a photoelastic technique. Good agreement was observed.

The integrated analysis and design approach tested here is based on partially converged solutions of the EBE-PCG iterative process. A study of the effect of the number of iterations on analysis and derivative accuracy was performed. Based on this analysis a choice was made for the number of iterations to be used in the integrated analysis and design procedure. It was found that the cost of the design could be significantly reduced with only minimal effects on the final shape and stress concentration factor.

Master of Science

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27

Liu, Zhaowei. "An isogeometric coupled boundary element method and finite element method for structural-acoustic analysis through loop subdivision surfaces." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/38988/.

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This present thesis proposes a novel approach for coupling finite element and boundary element formulations using a Loop subdivision surface discretisation to allow efficient acoustic scattering analysis over shell structures. The analysis of underwater structures has always been a challenge for engineers because it couples shell structural dynamics and acoustic scattering. In the present work, a finite element implementation of the Kirchhoff-Love formulation is used for shell structural dynamic analysis and the boundary element method is adopted to solve the Helmholtz equation for acoustic scattering analysis. The boundary element formulation is chosen as it can handle infinite domains without volumetric meshes. In the conventional engineering workflow, generating meshes of complex geometries to represent the underwater structures, e.g. submarines or torpedoes, is very time consuming and costly even if it is only a data conversion process. Isogeometric analysis (IGA) is a recently developed concept which aims to integrate computer aided design (CAD) and numerical analysis by using the same geometry model. Non-uniform rational B-splines~(NURBS), the most commonly used CAD technique, were considered in early IGA developments. However, NURBS have limitations when used in analysis because of their tensor-product nature. Subdivision surfaces discretisation is an alternative to overcome NURBS limitation. The new method adopts a triangular Loop subdivision surface discretisation for both geometry and analysis. The high order subdivision basis functions have $C^1$ continuity, which satisfies the requirements of the Kirchhoff-Love formulation and are highly efficient for the acoustic field computations. The control meshes for the shell analysis and the acoustic analysis have the same resolution, which provides a fully integrated isogeometric approach for coupled structural-acoustic analysis of shells. The method is verified by the example of an acoustic plane wave which scatters over an elastic spherical shell. The ability of the presented method to handle complex geometries is also demonstrated.

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28

Fayad, Ghassan Najib. "Probabilistic Finite Element Analysis of Marine Grade Composites." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/FayadGN2005.pdf.

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Maree, A. J. "The inverse finite element method : sensitivity to measurement setup /." Link to the online version, 2005. http://hdl.handle.net/10019/1088.

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30

Mohamed, Ali N. "An analysis of wave propagation due to pile driving vibrations by the finite element method." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372108.

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31

Jara-Almonte, C. C. "Finite element analysis of subregions using a specified boundary stiffness/force method." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54448.

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The accurate finite element analysis of subregions of large structures is difficult to carry out because of uncertainties about how the rest of the structure influences the boundary conditions and loadings of the subregion model. This dissertation describes the theoretical development and computer implementation of a new approach to this problem of modeling subregions. This method, the specified boundary stiffness/force (SBSF) method, results in accurate displacement and stress solutions as the boundary loading and the interaction between the stiffness of the subregion and the rest of the structure are taken into account. This method is computationally efficient because each time that the subregion model is analyzed, only the equations involving the degrees of freedom within the subregion model are solved. Numerical examples are presented which compare this method to some of the existing methods for subregion analysis on the basis of both accuracy of results and computational efficiency. The SBSF method is shown to be more accurate than another approximate method, the specified boundary displacement (SBD) method and to require approximately the same number of computations for the solution. For one case, the average error in the results of the SBD method was +2.75% while for the SBSF method the average error was -0.3%. The comparisons between the SBSF method and the efficient and exact zooming methods demonstrate that the SBSF method is less accurate than these methods but is computationally more efficient. In one example, the error for the exact zooming method was -0.9% while for the SBSF method it was -3.7%. Computationally, the exact zooming method requires almost 185% more operations than the SBSF method. Similar results were obtained for the comparison of the efficient zooming method and the SBSF method. Another use of the SBSF method is in the analysis of design changes which are incorporated into the subregion model but not into the parent model. In one subregion model a circular hole was changed to an elliptical hole. The boundary forces and stiffnesses from the parent model with the circular hole were used in the analysis of the modified subregion model. The results of the analysis of the most refined mesh in this example had an error of only -0.52% when compared to the theoretical result for the modified geometry. The results of the research presented in this dissertation indicate that the SBSF method is better suited to the analysis of subregions than the other methods documented in the literature. The method is both accurate and computationally efficient as well as easy to use and implement. The SBSF method can also be extended to the accurate analysis of subregion models with design changes which are not incorporated into the parent model.
Ph. D.

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32

Nader, Jacques Walid. "Probabilistic Finite Element Analysis and Size Effects of Polymer Matrix Marine Grade Composites." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/NaderJW2007.pdf.

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33

Maree, Abraham Jacobus. "The Inverse Finite Element Method: Sensitivity to Measurement Setup." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2640.

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Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2005.
In the inverse finite element method (iFEM), given a finite element model of a structure and imperfect displacement measurements, the external loads acting on the structure can be assessed. The basic idea behind iFEM is the optimization of a quadratic cost function of the difference between the measured and estimated values, with a high cost corresponding to a high precision of the measurements. In the present research it is firstly shown how the iFEM theory was broadened to accommodate for strain measurements through the construction of cost matrices to express the cost associated with the estimation of the response. The main focus of the research falls however on the influence that the measurement set-up has on the quality of the iFEM estimates. Only a limited number of measurements may be available, therefore it is essential to plan the measurement set-up carefully to obtain the highest quality of estimates. The number of measurements and the precision required to obtain a realistic result from an iFEM analysis is also a factor which plays a role and varies for different types of measurements. A numerical method for systematic sensitivity study of the measurements set-up without involving the actual measurement data, is presented. Two examples consisting of structures with both displacement measurements and strain measurements being taken, are presented. It illustrates how the sensitivity study method can be used to plan a more effective measurement set-up.

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34

Jiang, Chunxu. "Stability analysis of light gauge steel members using the finite element method and the generalized beam theory." Thesis, University of Salford, 1994. http://usir.salford.ac.uk/43027/.

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In this thesis a finite element programme for material and geometric nonlinear analysis, has been modified with pre- and post-data processing and eigenvalue solution. More efficient methods to solve elastic and inelastic eigenvalue and eigenvectors have been developed to deal with stability problems in structures with arbitrary shape, irregular stiffness, loads and boundary conditions. The Generalized Beam Theory (GBT) with the facilities of elastic spring restraints, buckling under coupled loads, different load locations has been developed and programmed by the author. It has been applied to reveal the basic behaviour and the interaction between the modes of light gauge steel members. It has been found that the AISI design approach with elastic bucking stresses obtained using GBT can be used to correctly predict the strength of compression thin-walled columns. Three different types of widely used light gauge steel members, namely rack columns, purlins and decks, have been analyzed using both FEM and GBT. The comparison of results from the numerical analyses and comprehensive tests agrees well. The author has risen to the challenge of complicated buckling problems and a pseudo-plastic design procedure for a continuous purlins and roof decks has been established in order to make the best us of the materials. Through the highly complex analyses, some important conclusions for composite deck profiles in the wet concrete stage have been obtained. The ECCS and AISI design approaches for bending have been found to be conservative when the deck is subject to plastic buckling or strength failure. The calculation of the ultimate web crippling load without consideration of bending moment is awkward and further light is shed on this topical problem. The influence of dimples in reducing the deck bending resistance mainly depends on the flange slenderness.

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35

Chu, Juhui, and 储聚慧. "Dynamic analysis of coupled structure foundation system by the finite element method." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46599150.

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Wu, Dan, and 吴丹. "Advanced transition finite element formulation for adaptive refinementanalysis of solids and structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769271.

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Kciuk, Thaddeus A. "The static and dynamic analysis of a complex optical-mechanical system utilizing the finite element method /." Online version of thesis, 1985. http://hdl.handle.net/1850/10326.

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38

Taylor, Joshua Michael. "Nonlinear analysis of steel frames with partially restrained composite connections and full or partially composite girders." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19272.

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39

Zhu, Junqing. "Structural Performance Analysis of Underground Stormwater Storage Chamber." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1338490426.

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40

Miller, Carlton W. "Optimization of model analysis and cross-orthogonality techniques to insure finite element model correlation to test data /." Online version of thesis, 1993. http://hdl.handle.net/1850/12216.

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41

Jackson, Timothy W. "Design-oriented aeroservoelastic optimization of strain-actuated aircraft /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9979.

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Lan, Shuang Wen. "Stochastic finite element analysis of structures with elementary stiffness matrix decomposition method and exponential polynomial moment method." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2148241.

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43

Kashif, Ahmed H. (Ahmed Hassan) Carleton University Dissertation Engineering Civil. "Dynamic response of highway bridges to moving vehicles." Ottawa, 1992.

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44

Ren, Zhen. "Modular model assembly from finite element models of components." Diss., Connect to online resource - MSU authorized users, 2008.

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45

Jau, Jih Jih. "Geometrically nonlinear finite element analysis of space frames." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54302.

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The displacement method of the finite element is adopted. Both the updated Lagrangian formulation and total Lagrangian formulation of a three-dimensional beam element is employed for large displacement and large rotation, but small strain analysis. A beam-column element or finite element can be used to model geometrically nonlinear behavior of space frames. The two element models are compared on the basis of their efficiency, accuracy, economy and limitations. An iterative approach, either Newton-Raphson iteration or modified Riks/Wempner iteration, is employed to trace the nonlinear equilibrium path. The latter can be used to perform postbuckling analysis.
Ph. D.

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46

Naderan-Tahan, Khosro. "Stress analysis of spherical shells with one and/or two neighbouring nozzles using internal pressure and external loadings by finite element method : a parametric survey." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242464.

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Cofer, William Franklin. "An analytical determination of ultimate strength of tubular joints for offshore structures." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/21494.

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48

Cloete, Renier. "A simplified finite element model for time-dependent deflections of flat slabs." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-05302005-123208/.

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49

Alan, Salih. "Development Of A Fast Analytical Method For Prediction Of Part Dynamics In Machining Stability Analysis." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611096/index.pdf.

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The objective of this study is to develop and implement practical and accurate methods for prediction of the workpiece dynamics during a complete machining cycle of the workpiece, so that FRFs of the workpiece can be used in chatter stability analysis. For this purpose, a structural modification method is used since it is an efficient tool for updating FRFs due to structural modifications. The removed mass is considered as a structural modification to the finished workpiece in order to determine the FRFs at different stages of the process. The method is implemented in a computer code and demonstrated on representative parts such as turbine blades. The predictions are compared and verified with the data obtained using FEA. The FRFs are used in chatter stability analyses, and the effect of part dynamics on stability is studied.

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50

Odi, A. R. A. "Bonded Repair of Composite Structures; A Finite Element Approach." Thesis, Department of Materials and Medical Sciences, 2009. http://hdl.handle.net/1826/3893.

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This thesis addresses the issues surrounding the application of the finite element method to analyse composite structure repairs with an emphasis on aircraft applications. A comprehensive literature survey has been carried out for this purpose and the results are presented. A preliminary study and a comparative study of different modelling approaches have been completed. These studies aim to explore and identify the problems in modelling repairso n simplec ompositep anelsw ith speciala ttention given to adhesivem odelling. Three modelling approaches have been considered: Siener's model which is an extension of the traditional plane strain 2D model used for adhesively bonded joints, Bait's model which is a promising new approach and a full 3D model. These studies have shown that these methods are complementary providing a different insight into bonded repairs. They have also highlighted the need for a new modelling approach which will provide an overall view of bonded repairs. Improved modelling approachesh ave been developedf or externallyb onded patch and flush repairs. These models enable the study of adhesive failure as well as composite adherendf ailures.T hesea pproachesh aveb eena ppliedt o real repairs and the predicted results compared to experimental data. Four case studies have been conducted: external bonded patch repairs to composite plates, a scarf joint for bonded repairs, a flat panel repaired with a scarfed patch and a repaired curved panel. These case studies have shown that bonded repairs to composite structures can be analyseds uccessfullyu sing PC-basedc ommercialf inite elementc odes.

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Dissertations / Theses on the topic 'Structural analysis (Engineering) Finite strip method'

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