Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    BIT 16 (1976), S. 313-321 
    ISSN: 1572-9125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A method is presented for the numerical inversion of Mellin transforms in which the inverse is obtained as an expansion in terms of Laguerre polynomials. The coefficients of this expansion are obtained as linear combinations of values of the transformed function or, equivalently, in terms of forward differences of this function. Thus, the Mellin transform of the series can be written as a forward interpolation series. Consequently the error of the numerical inversion procedure can be estimated. The practical advantage of the method is that values are needed for real arguments only.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    BIT 19 (1979), S. 368-377 
    ISSN: 1572-9125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Some cubature formulas for the evaluation of surface singular integrals are presented. The singular integral is considered as an iterated integral and these line integrals are calculated by using the modified quadrature formulas for integrals possessing real or complex poles, i.e. for singular integrals or regular ones. The error is obtained as the sum of two contour integrals. An estimate of the error for the Gauss-Jacobi and the Gauss-Chebyshev case is obtained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1572-9125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The convergence of a Gauss-Jacobi quadrature rule for the approximate evaluation of Cauchy principal value integrals has been described in recent papers [3] and [4] by the same authors, and will here be proved for Hölder-continuous functions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 30 (1979), S. 728-728 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 27 (1976), S. 801-814 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es wird das ebene elastostatische Problem eines symmetrischen gegabelten Risses für den unendlichen, isotropen und mit senkrecht zur Riss-Hauptachse belasteten Körpers untersucht, und zwar unter Anwendung der Methode der komplexen Potentiale. Das Problem wird auf ein Systen von drei singulären Integralgleichungen reduziert und weiter auf ein System linearer Gleichungen transformiert, vermittelst einer Näherung der Integrale mit Hilfe des leicht lösbaren numerischen Quadraturverfahrens von Gauss und Lobatto. Die Spannungsintensitätsfaktoren in den Spitzen des gegabelten Risses werden rechnerisch ermittelt und mit experimentellen Ergebnissen verglichen.
    Notes: Summary The plane elastostatic problem of a symmetrically branched crack in an infinite isotropic body loaded by normal stresses perpendicular to the main crack axis at infinity was studied by using the method of complex potentials. The problem was reduced to a system of three singular integral equations. By means of an approximation of the integrals through the Gauss and Lobatto numerical quadrature procedures, these singular integral equations were transformed into a system of linear equations, which can be readily solved. The stress intensity factors at the tips of the branched crack were computed directly from the solution of the above system of linear equations and were compared with the already existing experimental solutions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 61 (1991), S. 578-587 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht In dieser Arbeit wird der Einfluß von adhäsiven Materialien auf das Verhalten der Risse in zweidimensionalen linear-elastischen Körpern untersucht. Insbesondere werden Delaminations- und Entklebeeffekte behandelt. Es wird angenommen, daß das adhäsive Material ein nichtmonotones mehrdeutiges Gesetz einführt, das durch nichtkonvexe Superpotentiale beschreiben werden kann. Die direkte Randwertintegralmethode wird für dieses Problem erweitert. Man erhält zwei äquivalente, mehrdeutige Integralgleichungen für jeden Riß. Die Theorie wird durch numerische Beispiele erläutert, die die Berechnung der auftretenden Spannungskonzentrationsfaktoren betreffen.
    Notes: Summary The present paper studies the influence of adhesives on the behaviour of cracks in two-dimensional linear elastic bodies. Especially the delamination and debonding effects are studied. The adhesive material is assumed to introduce non-monotone, possibly multivalued laws which can be described via non-convex superpotentials. The direct boundary integral equation method is extended for this problem. It gives rise to two equivalent multivalued integral equations holding on each crack. Numerical examples concerning the resulting stress intensity factors illustrate the theory.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 62 (1992), S. 83-90 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Die Methode reflektierender Kaustiken wurde auf Stabknick probleme angewendet. Die von der Oberfläche des Stabes reflektierten Lichtstrahlen (parallel, konvergent oder divergent) erzeugen Kaustiken, die aus zwei stark leuchtenden geraden Linien bestehen, die den leuchtenden Bereich des Stabes begrenzen. Durch Messung des Abstands zwischen den Grenzen der Kaustiken kann der Störparameters des geknickten Stabes bestimmt werden. Eine genaue experimentelle Ermittlung vons ermöglicht die Lösung der nachs entwickelten Eulerschen Gleichungen für die kritische Knicklast und der Terme höherer Ordnung im Nachknickzustand. Die Methode ist eine vielseitige und sensitive Technik, um experimentell die elastische Knickform von Stäben zu bestimmen; sie kann auf das plastische Knicken ausgedehnt werden.
    Notes: Summary The optical method of reflected caustics was applied to beam buckling problems. The reflected rays of a light beam (either parallel, or convergent, or divergent) on the flanks of the strut create caustics which consist of two strongly illuminated straight lines, confining the luminous region of the strut. By measuring the distance between the extremities of the caustics, the perturbation parameters of the buckled beam can be defined. The accurate experimental evaluation ofs allows the solution of the respective Euler expansion equations for the critical buckling load and its higher order terms in the post-buckling state of the strut. The method is a versatile and sensitive technique for experimentally defining the mode of elastic buckling of struts and can be extended to study plastic buckling cases.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 63 (1993), S. 242-252 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Das elastische Problem einer unendlichen, orthotropen Platte mit verschiedenen Wurzeln ihrer charakteristischen Gleichung wird im Falle, daß die Fasern senkrecht zu einem inneren Riß verlaufen und daß sie durch ein elliptisches Loch geschwächt sind, im Rahmen der Lekhnitskii-Theorie gelöst. Die Platte wird im Unendlichen einer vorgeschriebenen Spannung unterworfen, während die Randbedingungen an den Rißflanken, am Lochrand und im Unendlichen gegeben sind. Mit Hilfe der Methode der komplexen Variable wird die Lösung des Problems zurückgeführt auf die Berechnung von Cauchy-Integralen der analytischen Funktionen des Problems. Die numerische Lösung des Problems zeigt eine starke Abhängigkeit von Mode-I-Spannungsintensitätsfaktoren (SIF) an den Rißspitzen von der Rißlänge oder des Ligaments zwischen der Rißplatte und dem Loch. Weiterhin wurde gezeigt, daß Orthotropie starken Einfluß auf die Spannungsintensität hat. Diese Beobachtungen stehen in voller Übereinstimmung mit Resultaten aus der Arbeit [1] über ein ähnliches Problem für eine orthotrope Platte, wo allerdings die Wurzel der charakteristischen Gleichung identisch sind.
    Notes: Summary The elastic problem of an infinite orthotropic plate with different roots of its characteristic equation, when the fibers are oriented perpendicularly to an internal crack, and is weakened by an elliptic hole, is solved using Lekhnitskii's theory. The plate is subjected to prescribed stresses at infinity, while the boundary conditions are given at the flanks of the crack, at the rim of the perforation and at infinity. Using the complex-variable method, the solution of the problem is reduced to the evaluation of Cauchy-type integrals concerning the analytic functions of the problem. The numerical solution of the problem revealed an intense variation of mode-I stress intensity factors (SIF) at the crack tips due to the increase of either the crack length, or the distance of the near-by rack tip from the center of the hole. Furthermore, it was found that orthotropy strongly influences the intensity of stresses at the crack tips. These findings are in complete agreement with results given in a previous work by the authors, concerning a similar problem for an orthotropic plate, which, however, constitutes a special case, where the material presents equal roots for its characteristic equation [1].
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 28 (1977), S. 1085-1098 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé Une équation intégrale du type de Cauchy singulière le long d'un intervalle fini réel et avec une fonction pondérante ayant des singularités complexes aux extremités de l'intervalle d'intégration peut être résolue numériquement par réduction à un système d'équations linéaires, en utilisant une règle appropriée d'intégration numérique associée aux polynômes de Jacobi, exactement de la même manière que dans le cas des singularités réelles. La façon la plus appropriée de trouver la solution numérique de cette équation telle qu'elle se présente dans les problèmes de fissure en élasticité plane et d'évaluer les facteurs de contrainte aux extremités da la fissure est la méthode d'intégration numérique de Lobatto-Jacobi.
    Notes: Summary A Cauchy type singular integral equation along a finite real interval and with a weight function with complex singularities at the end-points of the integration interval can be numerically solved by reduction to a system of linear equations, by using an appropriate numerical integration rule associated with the Jacobi polynomials, in exactly the same way used for the case of real singularities. For the numerical solution of such an equation arising in plane elasticity crack problems and the evaluation of stress intensity factors at crack tips, the Lobatto-Jacobi numerical integration rule is the most appropriate.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 12 (1976), S. 911-914 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...