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Modeling of fracture and damage in q...

Jirasek, Milan.

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Modeling of fracture and damage in quasibrittle materials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Modeling of fracture and damage in quasibrittle materials./
Author:	Jirasek, Milan.
Description:	254 p.
Notes:	Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2585.
Contained By:	Dissertation Abstracts International54-05B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9327222

Modeling of fracture and damage in quasibrittle materials.
Jirasek, Milan.

Modeling of fracture and damage in quasibrittle materials. - 254 p.

Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2585.

Thesis (Ph.D.)--Northwestern University, 1993.

The dissertation presents several mathematical models useful for the simulation of fracture and damage propagation in quasibrittle materials, which are characterized by the development of a large nonlinear process zone prior to failure. The simplest one is the R-curve model based on the replacement of the nonlinear fracture process zone by an equivalent linear elastic crack with a variable resistance against crack propagation. This approach is generalized by taking into account the effect of the loading rate. The emphasis is on the static loading rates rather than the dynamic ones, and creep in the bulk of the specimen is incorporated into the mathematical description.Subjects--Topical Terms:

1018410
Applied Mechanics.

Modeling of fracture and damage in quasibrittle materials.
LDR:03181nam 2200301 4500 001 1395327
005 20110509093504.5
008 130515s1993 ||||||||||||||||| ||eng d
035 $a (UMI)AAI9327222
035 $a AAI9327222
040 $a UMI $c UMI
100 1 $a Jirasek, Milan. $3 1673991
245 1 0 $a Modeling of fracture and damage in quasibrittle materials.
300 $a 254 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-05, Section: B, page: 2585.
500 $a Adviser: Zdenek P. Bazant.
502 $a Thesis (Ph.D.)--Northwestern University, 1993.
520 $a The dissertation presents several mathematical models useful for the simulation of fracture and damage propagation in quasibrittle materials, which are characterized by the development of a large nonlinear process zone prior to failure. The simplest one is the R-curve model based on the replacement of the nonlinear fracture process zone by an equivalent linear elastic crack with a variable resistance against crack propagation. This approach is generalized by taking into account the effect of the loading rate. The emphasis is on the static loading rates rather than the dynamic ones, and creep in the bulk of the specimen is incorporated into the mathematical description.
520 $a Another important class of models is based on the representation of a mechanical system by an assembly of interacting particles. A dynamic particle model is developed for the simulation of fracture of large sea ice floes during their impact on obstacles such as platforms or artificial islands. It is demonstrated that this model is capable of producing realistic results in terms of both the contact force history and the fracture pattern. Macroscopic fracture energy of random particle systems is studied as a function of the microscopic parameters using the size effect method. An effective numerical procedure for tracing a piecewise linear load-displacement curve is developed.
520 $a The previously proposed continuum-based microplane model is carefully analyzed and shown to perform poorly in certain situations. The conditions under which the model gives unsatisfactory results are described and the reasons for the poor performance are explained. Modifications on the microscopic level do not remedy the situation and a macro-level modification is unavoidable. A promising concept of the revised version is advocated by presenting improvements of the behavior in several elementary situations.
520 $a The dissertation is concluded by a localization analysis of a new concept of nonlocal averaging, strictly based on a micromechanically justified derivation. The analysis of the bifurcation at peak stress is followed by an incremental analysis of the post-peak behavior. It is shown that the new formulation preserves the essential properties of the original nonlocal approach and has some interesting added features.
590 $a School code: 0163.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Civil. $3 783781
690 $a 0346
690 $a 0543
710 2 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 54-05B.
790 1 0 $a Bazant, Zdenek P., $e advisor
790 $a 0163
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9327222