ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
Collection
Publisher
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 39 (1988), S. 573-578 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The stress intensity factor at the tip of a semi-infinite crack in an orthotropic infinite strip was determined. Clamped strip boundaries were considered.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 41 (1990), S. 889-899 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Crack-plane stresses and the stress intensity factor were determined in an orthotropic double-cantilever-beam configuration. The DCB fracture specimen was modeled as an infinite strip containing a semi-infinite crack at its midplane. Concentrated loads acted upon the crack surfaces, whereas the strip surfaces were traction free. Constitutive equations of an orthotropic body involving four independent material constants were considered. Fourier transforms and the Wiener-Hopf technique were utilized for an analytical solution within the context of the two-dimensional, linear theory of elasticity.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 43 (1992), S. 742-755 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A wave-heat correspondence principle is established by utilizing previous operational relations of van der Pol and Bremmer. By the suggested procedure, heat conduction problems can be solved by using an auxiliary wave-propagation problem in conjunction with the correspondence principle. A check on this procedure was provided by solving a mixed BVP of transient heat flow. The present correspondence principle is particularly useful in dealing with IBVPs involving wedge-shaped domains, and characteristic lengths.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 36 (1985), S. 146-165 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé On donne des solutions sous forme explicite ou sous forme de séries infinies pour des problèmes de fissures stables elastodynamiques. La configuration des problèmes traités consiste soit en un corps infini soumis à une extension plane, soit en un corps en forme de bande soumis à un cisaillement anti-plan. Les plaques étaient soumises à un état plan de contraintes constantes, agissant sur les faces de la fissure et suivant l'extrémité de la fissure avec la même vitesse. On a montré que dans le cas où le problème peut être exprimé par des équations d'ondes elliptiques, c.à.d. pour des vitesses de propagation de la fissure d'ordre subsonique, la solution a été réduite à une solution d'un problème de Dirichlet, tandis que dans le cas des équations d'ondes hyperboliques, c.à.d. pour des vitesses transoniques, le problème a été formulé et résolu comme un problème de Riemann-Hilbert.
    Notes: Summary Solutions in a closed-form, or in a series-expansion form, are given, concerning steady-state elastodynamic crack problems. The configuration of the problems treated consists, either of an infinite body under plane extension, or a strip-like body under anti-plane shear. The loading mode consisted of constant stresses, acting on the crack faces and moving with the velocity of the crack tip. In the domain of elliptic wave-equations, viz. for subsonic crack velocities, the solution of the problems was reduced to a solution of a Dirichlet problem, whereas in the case of hyperbolic wave-equations, viz. for transonic crack velocities, a Riemann-Hilbert problem was formulated and solved.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 45 (1994), S. 478-492 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Static rigid 2-D indentation of a linearly elastic half-plane in the presence of Coulomb friction which reverses its sign along the contact length is studied. The solution approach lies within the context of the mathematical theory of elastic contact mechanics. A rigid punch, having an unsymmetrical profile with respect to its apex and no concave regions, both slides over and indents slowly the surface of the deformable body. Both a normal and a tangential force may, therefore, be exerted on the punch. In such a situation, depending upon the punch profile and the relative magnitudes of the two external forces, a point in the contact zone may exist at which the surface friction changes direction. Moreover, this point of sign reversal may not coincide, in general, with the indentor's apex. This position and the positions of the contact zone edges can be determined only by first constructing a solution form containing the three problem's unspecified lengths, and then solving numerically a system of non-linear equations containing integrals not available in closed form. The mathematical procedure used to construct the solution deals with the Navier-Cauchy partial differential equations (plane-strain elastostatic field equations) supplied with boundary conditions of a mixed type. We succeed in formulating a second-kind Cauchy singular integral equation and solving it exactly by analytic-function theory methods. Representative numerical results are presented for two indentor profiles of practical interest—the parabola and the wedge.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 24 (1999), S. 90-99 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present work describes a procedure for the numerical evaluation of the classical integral-transform solution of the transient elastodynamic point-load (axisymmetric) Lamb's problem. This solution involves integrals of rapidly oscillatory functions over semi-infinite intervals and inversion of one-sided (time) Laplace transforms. These features introduce difficulties for a numerical treatment and constitute a challenging problem in trying to obtain results for quantities (e.g. displacements) in the interior of the half-space. To deal with the oscillatory integrands, which in addition may take very large values (pseudo-pole behavior) at certain points, we follow the concept of Longman's method but using as accelerator in the summation procedure a modified Epsilon algorithm instead of the standard Euler's transformation. Also, an adaptive procedure using the Gauss 32-point rule is introduced to integrate in the vicinity of the pseudo-pole. The numerical Laplace-transform inversion is based on the robust Fourier-series technique of Dubner/Abate-Crump-Durbin. Extensive results are given for sub-surface displacements, whereas the limit-case results for the surface displacements compare very favorably with previous exact results.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Computational mechanics 21 (1998), S. 347-352 
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The idea of considering tangential-displacement effects in a classical elastostatic contact problem is explored in this paper. The problem involves the static frictionless indentation of a linearly elastic half-plane by a rigid wedge, and its present formulation implies that the tangential surface displacements are not negligible and should thus be coupled with the normal surface displacements in imposing the contact zone boundary conditions. L.M. Brock introduced this idea some years ago in treating self-similar elastodynamic contact problems, and his studies indicated that such a formulation strongly influences the contact-stress behavior at half-plane points making contact with geometrical discontinuities of the indentor. The present work again demonstrates, by studying an even more classical problem, that the aforementioned considerations eliminate contact-stress singularities and therefore yield a more natural solution behavior. In particular, the familiar wedge-apex logarithmic stress-singularity encountered within the standard formulation of the problem (i.e. by avoiding the tangential displacement in the contact boundary condition) disappears within the proposed formulation. The contact stress beneath the wedge apex takes now a finite value depending on the wedge inclination angle and the material constants. By utilizing pertinent integral relations for the displacement/stress field in the half-plane, an unusual mixed boundary-value problem results whose solution is obtained through integral equations.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 60 (1986), S. 113-119 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A problem of sufficient practical interest was solved in this paper within the context of linear elastostatics. The elastic body has the form of a shaft with a circular cracked cross-section, the crack being a segment of a diameter, not necessarily in the central position. The external loading was a twisting couple or, equivalently, anti-plane stresses acting on the crack faces. The solution is effected by using complex-variable techniques and reducing the problem to the Keldysh-Sedov mixed boundary value problem. In our opinion, this approach is the most simple and straightforward as compared with previous procedures which have solved similar problems.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 68 (1987), S. 265-275 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The problem of two cracks emanating from the same origin and propagating asymmetrically at different velocities in an elastic and isotropic solid is treated in this paper. An unbounded and otherwise undisturbed medium and a constant anti-plane loading at infinity were assumed. Techniques of self-similar elastodynamics were utilized in conjunction with analytic-function theory. Since a closed-form solution of such a problem is impossible we relied in the last steps of the procedure upon numerical analysis.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 111 (1995), S. 1-12 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The transient hoop stresses which are generated at the circumference of a circular hole in a large viscoelastic plate when a radial pressure pulse acts on the hole boundary, are determined. An analytical/numerical approach is employed which is based on the use of Laplace transform and Hankel functions, and the Dubner-Abate-Crump technique for inverting the Laplace-transformed solution. In our formulation of the problem, a general linear-viscoelastic material for the plate is considered, but numerical results are extracted only for a three-parameter model (standard linear solid). The present work accompanies recent efforts by Georgiadis on analogous transient viscoelastodynamic problems involving finite-length cracks in a stress-wave environment. The mathematically simpler problem considered here demonstrates the influence of viscoelastic effects on the dynamic-stress-concentration in marked similarity with the dynamic-stress-intensity behavior of crack-tip viscoelastic stress fields. Besides that, the present problem generalizes the classical Kromm-Selberg-Miklowitz problem in the sense that it considers viscoelastic response. The latter solutions were not utilized here through the usual elastic/viscoelastic correspondence principle but, instead, an independent solution was derived by simple means.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...