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The Trefftz Method using Fundamental Solutions for Biharmonic EquationsTing-chun, Daniel 30 June 2008 (has links)
In this thesis, the analysis of the method of fundamental solution(MFS) is expanded for biharmonic equations. The bounds of errors are derived for the traditional and the Almansi's approaches in bounded simply-connected domains. The exponential and the polynomial convergence rates are obtained from highly and finite smooth solutions, respectively. Also the bounds of condition number are derived for the disk domains, to show the exponential growth rates. The analysis in this thesis is the first time to provide the rigor analysis of the CTM for biharmonic equations, and the intrinsic nature of accuracy and stability is similar to that of Laplace's equation.
Numerical experiment are carried out for both smooth and singularity problems. The numerical results coincide with the theoretical analysis made. When the particular solutions satisfying the biharmonic equation can be found, the method of particular solutions(MPS) is always superior to MFS, supported by numerical examples. However, if such singular particular solutions near the singular points can not be found, the local refinement of collocation nodes and the greedy adaptive techniques can be used. It seems that the greedy adaptive techniques may provide a better solution for singularity problems. Beside, the numerical solutions by Almansi's approaches are slightly better in accuracy and stability than those by the traditional FS. Hence, the MFS with Almansi's approaches is recommended, due to the simple analysis, which can be obtained directly from the analysis of MFS for Laplace's equation.
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Harmonicity in Slice Analysis: Almansi decomposition and Fueter theorem for several hypercomplex variablesBinosi, Giulio 10 June 2024 (has links)
The work is situated within the theory of slice analysis, a generalization of complex analysis for hypercomplex numbers, considering function of both quaternionic and Clifford variables, in both one and several variables.
%We first characterize some partial slice sets of
The primary focus of the thesis is on the harmonic and polyharmonic properties of slice regular functions. We derive explicit formulas for the iteration of the Laplacian on slice regular functions, proving that their degree of harmonicity increases with the dimension of the algebra. Consequently, we present Almansi-type decompositions for slice functions in several variables. Additionally, using the harmonic properties of the partial spherical derivatives and their connection with the Dirac operator in Clifford analysis, we achieve a generalization of the Fueter and Fueter-Sce theorems in the several variables context. Finally, we establish that regular polynomials of sufficiently low degree are the unique slice regular functions in the kernel of the iteration of the Laplacian, whose power is less than Sce index.
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Analysis of Hyperelastic Materials with Mechanica - Theory and Application ExamplesJakel, Roland 03 June 2010 (has links) (PDF)
Part 1: Theoretic background information
- Review of Hooke’s law for linear elastic materials
- The strain energy density of linear elastic materials
- Hyperelastic material
- Material laws for hyperelastic materials
- About selecting the material model and performing tests
- Implementation of hyperelastic material laws in Mechanica
- Defining hyperelastic material parameters in Mechanica
- Test set-ups and specimen shapes of the supported material tests
- The uniaxial compression test
- Stress and strain definitions in the Mechanica LDA analysis
Part 2: Application examples
- A test specimen subjected to uniaxial loading
- A volumetric compression test
- A planar test
- Influence of the material law
Appendix
- PTC Simulation Services Introduction
- Dictionary Technical English-German / Teil 1: Theoretische Hintergrundinformation
- Das Hookesche Gesetz für linear-elastische Werkstoffe
- Die Dehnungsenergiedichte für linear-elastische Materialien
- Hyperelastisches Material
- Materialgesetze für Hyperelastizität
- Auswählen des Materialgesetzes und Testdurchführung
- Implementierung der hyperelastischen Materialgesetze in Mechanica
- Definieren der hyperelastischen Materialparameter in Mechanica
- Testaufbauten und Prüfkörper der unterstützten Materialtests
- Der einachsige Druckversuch
- Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen
Verformungen
Teil 2: Anwendungsbeispiele
- Ein einachsig beanspruchter Prüfkörper
- Ein volumetrischer Drucktest
- Ein planarer Test
- Einfluss des Materialgesetzes
Anhang:
- Kurzvorstellung der PTC Simulationsdienstleistungen
- Wörterbuch technisches Englisch-Deutsch
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Analysis of Hyperelastic Materials with Mechanica - Theory and Application Examples / Analyse hyperelastischer Materialien mit Mechanica - Theorie und AnwendungsbeispieleJakel, Roland 03 December 2010 (has links) (PDF)
Part 1: Theoretic background information
- Review of Hooke’s law for linear elastic materials
- The strain energy density of linear elastic materials
- Hyperelastic material
- Material laws for hyperelastic materials
- About selecting the material model and performing tests
- Implementation of hyperelastic material laws in Mechanica
- Defining hyperelastic material parameters in Mechanica
- Test set-ups and specimen shapes of the supported material tests
- The uniaxial compression test
- Stress and strain definitions in the Mechanica LDA analysis
Part 2: Application examples
- A test specimen subjected to uniaxial loading
- A volumetric compression test
- A planar test
- Influence of the material law
Appendix
- PTC Simulation Services Introduction
- Dictionary Technical English-German / Teil 1: Theoretische Hintergrundinformation
- Das Hookesche Gesetz für linear-elastische Werkstoffe
- Die Dehnungsenergiedichte für linear-elastische Materialien
- Hyperelastisches Material
- Materialgesetze für Hyperelastizität
- Auswählen des Materialgesetzes und Testdurchführung
- Implementierung der hyperelastischen Materialgesetze in Mechanica
- Definieren der hyperelastischen Materialparameter in Mechanica
- Testaufbauten und Prüfkörper der unterstützten Materialtests
- Der einachsige Druckversuch
- Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen
Verformungen
Teil 2: Anwendungsbeispiele
- Ein einachsig beanspruchter Prüfkörper
- Ein volumetrischer Drucktest
- Ein planarer Test
- Einfluss des Materialgesetzes
Anhang:
- Kurzvorstellung der PTC Simulationsdienstleistungen
- Wörterbuch technisches Englisch-Deutsch
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Analysis of Hyperelastic Materials with Mechanica - Theory and Application ExamplesJakel, Roland 03 June 2010 (has links)
Part 1: Theoretic background information
- Review of Hooke’s law for linear elastic materials
- The strain energy density of linear elastic materials
- Hyperelastic material
- Material laws for hyperelastic materials
- About selecting the material model and performing tests
- Implementation of hyperelastic material laws in Mechanica
- Defining hyperelastic material parameters in Mechanica
- Test set-ups and specimen shapes of the supported material tests
- The uniaxial compression test
- Stress and strain definitions in the Mechanica LDA analysis
Part 2: Application examples
- A test specimen subjected to uniaxial loading
- A volumetric compression test
- A planar test
- Influence of the material law
Appendix
- PTC Simulation Services Introduction
- Dictionary Technical English-German / Teil 1: Theoretische Hintergrundinformation
- Das Hookesche Gesetz für linear-elastische Werkstoffe
- Die Dehnungsenergiedichte für linear-elastische Materialien
- Hyperelastisches Material
- Materialgesetze für Hyperelastizität
- Auswählen des Materialgesetzes und Testdurchführung
- Implementierung der hyperelastischen Materialgesetze in Mechanica
- Definieren der hyperelastischen Materialparameter in Mechanica
- Testaufbauten und Prüfkörper der unterstützten Materialtests
- Der einachsige Druckversuch
- Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen
Verformungen
Teil 2: Anwendungsbeispiele
- Ein einachsig beanspruchter Prüfkörper
- Ein volumetrischer Drucktest
- Ein planarer Test
- Einfluss des Materialgesetzes
Anhang:
- Kurzvorstellung der PTC Simulationsdienstleistungen
- Wörterbuch technisches Englisch-Deutsch
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Analysis of Hyperelastic Materials with Mechanica - Theory and Application ExamplesJakel, Roland 03 December 2010 (has links)
Part 1: Theoretic background information
- Review of Hooke’s law for linear elastic materials
- The strain energy density of linear elastic materials
- Hyperelastic material
- Material laws for hyperelastic materials
- About selecting the material model and performing tests
- Implementation of hyperelastic material laws in Mechanica
- Defining hyperelastic material parameters in Mechanica
- Test set-ups and specimen shapes of the supported material tests
- The uniaxial compression test
- Stress and strain definitions in the Mechanica LDA analysis
Part 2: Application examples
- A test specimen subjected to uniaxial loading
- A volumetric compression test
- A planar test
- Influence of the material law
Appendix
- PTC Simulation Services Introduction
- Dictionary Technical English-German / Teil 1: Theoretische Hintergrundinformation
- Das Hookesche Gesetz für linear-elastische Werkstoffe
- Die Dehnungsenergiedichte für linear-elastische Materialien
- Hyperelastisches Material
- Materialgesetze für Hyperelastizität
- Auswählen des Materialgesetzes und Testdurchführung
- Implementierung der hyperelastischen Materialgesetze in Mechanica
- Definieren der hyperelastischen Materialparameter in Mechanica
- Testaufbauten und Prüfkörper der unterstützten Materialtests
- Der einachsige Druckversuch
- Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen
Verformungen
Teil 2: Anwendungsbeispiele
- Ein einachsig beanspruchter Prüfkörper
- Ein volumetrischer Drucktest
- Ein planarer Test
- Einfluss des Materialgesetzes
Anhang:
- Kurzvorstellung der PTC Simulationsdienstleistungen
- Wörterbuch technisches Englisch-Deutsch
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