Softening slip and size effect in bond fracture

Zdeněk P. Bažant; Rodrigue Dcsmorat

Softening slip and size effect in bond fracture

Zdeněk P. Bažant, Rodrigue Dcsmorat

Civil and Environmental Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

The size effect caused by post-peak softening in the relation of interface shear stress and slip displacement between a fiber or reinforcing bar and the surrounding matrix, is analyzed. The problem is simplified as one-dimensional. It is shown that the post-peak softening leads to localization of slip. The larger the bar or fiber size, the stronger the localization. The size effect in geometrically similar pullout tests of different sizes is found to represent a transition from the case of no size effect for small sizes to the case of a size effect of the same type as in linear elastic fracture mechanics, in which the difference of the pullout stress in the fiber and the residual pullout stress corresponding to the residual interface shear stress is proportional to the inverse square root of bar or fiber size. An analytical expression for the transitional size effect is obtained and is found to approximately agree with the generalized form of the size effect law proposed earlier by Bažant. Measurements of the size effect can be used for identifying the interface properties.

Original language	English (US)
Title of host publication	Interface Fracture and Bond
Editors	Oral Buyukozturk, Methi Wecharatana
Publisher	American Concrete Institute
Pages	11-23
Number of pages	13
ISBN (Electronic)	9780870316548
State	Published - Sep 1 1995

Publication series

Name	American Concrete Institute, ACI Special Publication
Volume	SP-156
ISSN (Print)	0193-2527

Funding

AcKNOWLEDGEMENTS. -Financial support under AFOSR Grant 91-0140 to Northwestern University (monitored by Dr. Jim Chang) is gratefully acknowledged. The general size effect studies were partially supported by the Center for Advanced Cement-Based Materials at Northwestern University.

Keywords

Bonding: composite materials
Damage
Fiber reinforced concretes
Fibers (discreet fibers)
Fracture properties: size effect

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

Cite this

@inproceedings{4056a3d138294a5ea79f1dd2f06dd6aa,

title = "Softening slip and size effect in bond fracture",

abstract = "The size effect caused by post-peak softening in the relation of interface shear stress and slip displacement between a fiber or reinforcing bar and the surrounding matrix, is analyzed. The problem is simplified as one-dimensional. It is shown that the post-peak softening leads to localization of slip. The larger the bar or fiber size, the stronger the localization. The size effect in geometrically similar pullout tests of different sizes is found to represent a transition from the case of no size effect for small sizes to the case of a size effect of the same type as in linear elastic fracture mechanics, in which the difference of the pullout stress in the fiber and the residual pullout stress corresponding to the residual interface shear stress is proportional to the inverse square root of bar or fiber size. An analytical expression for the transitional size effect is obtained and is found to approximately agree with the generalized form of the size effect law proposed earlier by Ba{\v z}ant. Measurements of the size effect can be used for identifying the interface properties.",

keywords = "Bonding: composite materials, Damage, Fiber reinforced concretes, Fibers (discreet fibers), Fracture properties: size effect",

author = "Ba{\v z}ant, {Zden{\v e}k P.} and Rodrigue Dcsmorat",

note = "Funding Information: AcKNOWLEDGEMENTS. -Financial support under AFOSR Grant 91-0140 to Northwestern University (monitored by Dr. Jim Chang) is gratefully acknowledged. The general size effect studies were partially supported by the Center for Advanced Cement-Based Materials at Northwestern University. Publisher Copyright: {\textcopyright} 1995 American Concrete Institute. All rights reserved.",

year = "1995",

month = sep,

day = "1",

language = "English (US)",

series = "American Concrete Institute, ACI Special Publication",

publisher = "American Concrete Institute",

pages = "11--23",

editor = "Oral Buyukozturk and Methi Wecharatana",

booktitle = "Interface Fracture and Bond",

}

TY - GEN

T1 - Softening slip and size effect in bond fracture

AU - Bažant, Zdeněk P.

AU - Dcsmorat, Rodrigue

N1 - Funding Information: AcKNOWLEDGEMENTS. -Financial support under AFOSR Grant 91-0140 to Northwestern University (monitored by Dr. Jim Chang) is gratefully acknowledged. The general size effect studies were partially supported by the Center for Advanced Cement-Based Materials at Northwestern University. Publisher Copyright: © 1995 American Concrete Institute. All rights reserved.

PY - 1995/9/1

Y1 - 1995/9/1

N2 - The size effect caused by post-peak softening in the relation of interface shear stress and slip displacement between a fiber or reinforcing bar and the surrounding matrix, is analyzed. The problem is simplified as one-dimensional. It is shown that the post-peak softening leads to localization of slip. The larger the bar or fiber size, the stronger the localization. The size effect in geometrically similar pullout tests of different sizes is found to represent a transition from the case of no size effect for small sizes to the case of a size effect of the same type as in linear elastic fracture mechanics, in which the difference of the pullout stress in the fiber and the residual pullout stress corresponding to the residual interface shear stress is proportional to the inverse square root of bar or fiber size. An analytical expression for the transitional size effect is obtained and is found to approximately agree with the generalized form of the size effect law proposed earlier by Bažant. Measurements of the size effect can be used for identifying the interface properties.

AB - The size effect caused by post-peak softening in the relation of interface shear stress and slip displacement between a fiber or reinforcing bar and the surrounding matrix, is analyzed. The problem is simplified as one-dimensional. It is shown that the post-peak softening leads to localization of slip. The larger the bar or fiber size, the stronger the localization. The size effect in geometrically similar pullout tests of different sizes is found to represent a transition from the case of no size effect for small sizes to the case of a size effect of the same type as in linear elastic fracture mechanics, in which the difference of the pullout stress in the fiber and the residual pullout stress corresponding to the residual interface shear stress is proportional to the inverse square root of bar or fiber size. An analytical expression for the transitional size effect is obtained and is found to approximately agree with the generalized form of the size effect law proposed earlier by Bažant. Measurements of the size effect can be used for identifying the interface properties.

KW - Bonding: composite materials

KW - Damage

KW - Fiber reinforced concretes

KW - Fibers (discreet fibers)

KW - Fracture properties: size effect

UR - http://www.scopus.com/inward/record.url?scp=84996541572&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84996541572&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84996541572

T3 - American Concrete Institute, ACI Special Publication

SP - 11

EP - 23

BT - Interface Fracture and Bond

A2 - Buyukozturk, Oral

A2 - Wecharatana, Methi

PB - American Concrete Institute

ER -

Softening slip and size effect in bond fracture

Abstract

Publication series

Funding

Keywords

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this