| 1. |
- Giannakopoulos, A. E., et al.
(författare)
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The Stresses Around A Partly Microcracked Hole In Certain Ceramic Materials Under Internal-Pressure.
- 1991
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Ingår i: International Journal of Solids and Structures. - 0020-7683 .- 1879-2146. ; 28:3, s. 329-339
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Tidskriftsartikel (refereegranskat)abstract
- In the present work we examine the stress field around a hole in certain ceramic materials. The hole is under internal pressure in plane strain conditions. The material behavior is initially isotropic linearly elastic and upon loading develops microcracks. The damage is assumed to be anisotropic and microcracking is believed to take place along preferred orientations. A damaged constitutive law, appropriate for the microcracking assumptions, is used to derive exact results for the stress fields in this particular problem. The present analysis may find applications in the experimental investigation of ceramic materials behaving as anisotropically microcracking solids.
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| 2. |
- Girhammar, Ulf Arne, et al.
(författare)
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Dynamic analysis of composite members with interlayer slip
- 1993
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Ingår i: International Journal of Solids and Structures. - : Pergamon Press. - 0020-7683 .- 1879-2146. ; 30:6, s. 797-823
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Tidskriftsartikel (refereegranskat)abstract
- The exact and approximate analysis of composite members with partial interaction and subjected to general dynamic loading are presented. General closed-form solutions for the displacement functions and the various internal actions in the composite elements are presented for both the exact and approximate cases. The solutions reduce to the well-known values for the extreme cases of interlayer connection: non-composite and full composite action, respectively. An approximate solution for the eigenfrequencies in the exact analysis procedure is proposed and evaluated by comparison with the exact solution. These solutions show the effect of interlayer connection on the eigenfrequency. The exact and approximate analysis procedures are applied to simply-supported beams subjected to impulsive and step loadings to illustrate the difference in the solutions obtained by the two procedures. Very good agreement is obtained between the results of exact and approximate analysis of these particular cases
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| 3. |
- Gudmundson, Peter, et al.
(författare)
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An analytic model for thermoelastic properties of composite laminates containing transverse matrix cracks
- 1993
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Ingår i: International Journal of Solids and Structures. - 0020-7683 .- 1879-2146. ; 30:23, s. 3211-3231
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Tidskriftsartikel (refereegranskat)abstract
- An analytical model for the prediction of the thermoelastic properties of composite laminates containing matrix cracks is presented. In particular, transverse matrix cracks with their crack surfaces parallel to the fibre direction and perpendicular to the laminate plane are treated. Two- and three-dimensional laminates of arbitrary layup configurations are covered by the model. The presented expressions for stiffnesses, thermal expansion coefficients, strain contributions from release of residual stresses and local average ply stresses and strains do solely contain known ply property data and matrix crack densities. The key to the model is the judicious use of a known analytical solution for a row of cracks in an infinite isotropic medium. The model has been verified against numerically determined stiffnesses, thermal expansion coefficients and local average ply stresses for matrix cracked angle-ply and cross-ply laminates. Comparisons to experimental data for cross-ply laminates are also presented. It is shown that the present model to a very good accuracy can predict thermoelastic properties of matrix cracked composite laminates at varying matrix crack densities and layup configurations.
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| 4. |
- Runesson, Kenneth, et al.
(författare)
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Characteristics of constitutive relations in soil plasticity for undrained behavior
- 1992
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Ingår i: International Journal of Solids and Structures. - : Elsevier BV. - 0020-7683 .- 1879-2146. ; 29:3, s. 363-380
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Tidskriftsartikel (refereegranskat)abstract
- Elastic-plastic relations which are subjected to the constraint of incompressibilily, that is pertinent to undruined behavior of soils, are assessed and compared with the relations for drained behavior. The tangent relations for mixed control variables (total stress and strain components) are established explicitly. The criterion signalling plastic loading, and elastic unloading, is considered in particular. A criterion for unique response, as expressed in terms of elastic and plastic loading, is formulated as a condition on the particular plastic modulus that corresponds to undrained behavior. Stability is discussed in terms of appropriate critical values of the plastic modulus. It appears that, for a frictional material, dilatancy has a stabilizing effect whereas contractancy may be destabilizing compared to drained behavior.
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| 5. |
- Tan, X.C., et al.
(författare)
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Buckling of drill string under the action of gravity and axial thrust
- 1993
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Ingår i: International Journal of Solids and Structures. - 0020-7683 .- 1879-2146. ; 30:19, s. 2675-2691
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Tidskriftsartikel (refereegranskat)abstract
- A number of different equilibrium helical buckling configurations for a tubing or drill string confined within a cylindrical casing or hole of larger radius and buckled under static compressive forces are determined. Our work is more general and informative than earlier work since the solutions relating the buckling load and the postbuckling configuration are given explicitly for the string of weight and at any inclined positions. A consideration of the state of transient string buckling when the string undergoes sudden change in the helix radius and might lose contact with the hole wall is also proposed.
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| 6. |
- Zang, W.L., et al.
(författare)
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Kinked Cracks In An Anisotropic Plane Modeled By An Integral-Equation Method.
- 1991
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Ingår i: International Journal of Solids and Structures. - : Elsevier BV. - 0020-7683 .- 1879-2146. ; 27:14, s. 1855-1865
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Tidskriftsartikel (refereegranskat)abstract
- A boundary integral method for cracks in an anisotropic material is presented. The method is based on the integral equation for the resultant forces along the cracks. The integral kernels contain only a weak logarithmic singularity, which simplifies the numerical implementation. Crack closure is also taken into account in the numerical formulation. Numerical tests are presented to illustrate the efficiency and the reliability of the proposed method.
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| 7. |
- Giannakopoulos, AE, et al.
(författare)
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Analysis of Vickers Indentation
- 1994
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Ingår i: International Journal of Solids and Structures. - 0020-7683 .- 1879-2146. ; 31:19, s. 2679-2708
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Tidskriftsartikel (refereegranskat)
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