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Modeling high-strain-rate loading in...

Katcoff, Cynthia Zingale.

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Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids./
Author:	Katcoff, Cynthia Zingale.
Description:	429 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
Contained By:	Dissertation Abstracts International74-11B(E).
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3572754
ISBN:	9781303395192

Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids.
Katcoff, Cynthia Zingale.

Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids. - 429 p.

Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.

Thesis (Ph.D.)--The Johns Hopkins University, 2013.

Brittle materials are becoming common in high strain rate loading situations, and most models of brittle materials focus on crack growth from pre-existing linear cracks. However, most brittle materials also contain air voids or soft inclusions that can be idealized as circular flaws. We modify the existing two dimensional model framework from Paliwal and Ramesh (2008) to include circular flaws. This is a dynamic self-consistent, elastic-based flaw-driven damage model with degrading material properties.

ISBN: 9781303395192Subjects--Topical Terms:

783781
Engineering, Civil.

Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids.
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020 $a 9781303395192
035 $a (MiAaPQ)AAI3572754
035 $a AAI3572754
040 $a MiAaPQ $c MiAaPQ
100 1 $a Katcoff, Cynthia Zingale. $3 2094186
245 1 0 $a Modeling high-strain-rate loading in brittle materials with a self-consistent model focused on circular voids.
300 $a 429 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-11(E), Section: B.
500 $a Adviser: Lori Graham-Brady.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2013.
520 $a Brittle materials are becoming common in high strain rate loading situations, and most models of brittle materials focus on crack growth from pre-existing linear cracks. However, most brittle materials also contain air voids or soft inclusions that can be idealized as circular flaws. We modify the existing two dimensional model framework from Paliwal and Ramesh (2008) to include circular flaws. This is a dynamic self-consistent, elastic-based flaw-driven damage model with degrading material properties.
520 $a The two dimensional circular flaw model is used to predict when pore flaws significantly decrease material strength at a given strain rate. A modified pore flaw, with inclined initial cracks, is necessary to better reflect the behavior of pores in brittle materials. The stress intensity for this flaw type uses the stress intensity from Sammis and Ashby (1986) and a stress intensity for shear along the inclined cracks.
520 $a We combine the pore and linear crack models to predict material strength for brittle material with both circular pore and slit-like flaw types. Pore flaws are generally found to have a more significant effect if in a material with a low density of pre-existing linear cracks. Pore flaws may also be significant when flaw radii are around or larger than the half-length of pre-existing linear cracks. In order to address material heterogeneity, we generate a spatial distribution of flaws and use this to predict material local strength. Variations in strength are seen to vary spatially and follow a lognormal distribution. Comparisons of the two dimensional model to a basic three dimensional model are made for uniaxial compressive loading. The predicted strength results are in a similar range and suggest that use of a three dimensional model may not be necessary for uniaxial loading. Characterization of actual mortar samples is used as a basis for the model to predict dynamic strength.
590 $a School code: 0098.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, General. $3 1020744
690 $a 0543
690 $a 0548
690 $a 0537
710 2 $a The Johns Hopkins University. $b Civil Engineering. $3 2094187
773 0 $t Dissertation Abstracts International $g 74-11B(E).
790 $a 0098
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3572754