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Modeling variable friction and slip ...

Foster, Craig D.

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Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element./
Author:	Foster, Craig D.
Description:	139 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2721.
Contained By:	Dissertation Abstracts International67-05B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3219272
ISBN:	9780542706738

Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element.
Foster, Craig D.

Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element. - 139 p.

Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2721.

Thesis (Ph.D.)--Stanford University, 2006.

Localized shear deformation plays an important role in a number of geotechnical and geological processes. Slope failures, the formation and propagation of faults, cracking in concrete dams, and shear fractures in subsiding hydrocarbon reservoir rock are examples of important consequences of shear localization. Traditional engineering analyses of these phenomena, such as limit equilibrium techniques, make certain assumptions on the shape of the failure surface as well as other simplifications. While these methods provide reasonable, if conservative, results for the applications for which they were designed, many problems have more complex geometries and loading patterns.

ISBN: 9780542706738Subjects--Topical Terms:

1018410
Applied Mechanics.

Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element.
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008 130610s2006 eng d
020 $a 9780542706738
035 $a (UMI)AAI3219272
035 $a AAI3219272
040 $a UMI $c UMI
100 1 $a Foster, Craig D. $3 1917804
245 1 0 $a Modeling variable friction and slip weakening of localized geomaterials using an embedded strong discontinuity finite element.
300 $a 139 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2721.
500 $a Adviser: Ronaldo I. Borja.
502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 $a Localized shear deformation plays an important role in a number of geotechnical and geological processes. Slope failures, the formation and propagation of faults, cracking in concrete dams, and shear fractures in subsiding hydrocarbon reservoir rock are examples of important consequences of shear localization. Traditional engineering analyses of these phenomena, such as limit equilibrium techniques, make certain assumptions on the shape of the failure surface as well as other simplifications. While these methods provide reasonable, if conservative, results for the applications for which they were designed, many problems have more complex geometries and loading patterns.
520 $a The finite element method is one approach to modeling the behavior of bodies with complex geometries. Standard finite elements capture varied loading and deformation patterns on arbitrary bodies quite well, and advancements in material modeling have led to more accurate prediction of the stresses and the onset of localization. However, for numerical reasons standard finite elements have difficulty capturing the softening and anisotropic damage that accompanies localized deformation. To solve this difficulty, an enhanced element has been developed that is capable of capturing a failure surface at an arbitrary position and orientation within the element.
520 $a Previous studies with this element have been limited to simple surface constitutive models. Physical experiments of rock, however, show more complex behavior. Initially, the shear strength drops rapidly as a coherent macrocrack develops. As the cohesive strength drops, it is replaced by a frictional response. The friction may vary with slip speed, wear on a changing population of contacts, temperature, and other factors. A rate- and state-dependent friction model developed by Dieterich, Ruina, Rice and others captures this behavior and models stable and unstable slip on surfaces. To capture the response of the localizing material in an arbitrary body, we embed this coupled slip weakening-frictional response into the enhanced element. The initiation of localization is captured by tracking the onset of a material instability (bifurcation condition). The coupled model is embedded numerically in the element using a generalized trapezoidal scheme. The slip speed and state variable are solved via element-level Newton iteration.
590 $a School code: 0212.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Civil. $3 783781
690 $a 0346
690 $a 0543
710 2 0 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 67-05B.
790 1 0 $a Borja, Ronaldo I., $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3219272