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95008

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams.

Article

Last updated: 04 Jan 2025

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Tags

Civil Engineering

Abstract

Fracture mechanics is based on the assumption that all engineering materials contain cracks from which failure starts. Structures have sizeable existing cracks that might or might not grow, depending on the load level. when a material has an existing crack, that lead to high stresses near the crack tip. Stress field type in the region of the crack tip can be defined of mode I, where two fracture surfaces are displaced perpendicular to each other in opposite direction where crack growth takes place. The crack tip stress and displacement field can be uniquely characterized by the stress intensity factor, SIF, It is neither the magnitude of stress nor strain, but it is a unique parameter that describes the effect of loading at the crack tip region and the resistance of the material. Stress intensity filed is valid for a small region around the crack tip. It depends on both the values of stress and crack size. In the present work, numerical models were designed to study the effect of specimen thickness, crack-depth ratios and concrete compressive strengths on the behavior of SIF for concrete beams. Nine beams were idealized with dimensions of 1500 mm length, 400 mm depth and different thickness 120, 250 and 400 mm. The crack-depth ratios were 0.1, 0.2 and 0.3 and the concrete compressive strengths were 25, 40 and 55 MPa. The results proved that there is a decrease in SIF with increase in specimen thickness. On the other hand; there is an increase in SIF values with increase in concrete compressive strength and crack-depth ratio.

DOI

10.21608/bfemu.2020.95008

Keywords

Fracture mechanics, Stress Intensity Factor, thickness effect, ANSYS, crack depth ratio, strength of concrete, Finite element method

Authors

First Name

Seleem

Last Name

ELSayed

MiddleName

Saleh

Affiliation

Professor and Head of Engineering Material department, faculty of Engineering Zagazig University, Zagazig, Egypt

Email

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City

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Orcid

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First Name

Ghada

Last Name

Gamiaa

MiddleName

Mohamed Abd Elhady

Affiliation

MSc student, Materials Engineering Dept.,faculty of Engineering Zagazig University, Zagazig, Egypt

Email

engineergh49@yahoo.com

City

-

Orcid

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Volume

44

Article Issue

4

Related Issue

14066

Issue Date

2019-12-01

Receive Date

2019-01-03

Publish Date

2020-06-11

Page Start

1

Page End

6

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 44_Issue 4_Pages 1-6.pdf

PDF . 422.0kB

Link

https://bfemu.journals.ekb.eg/article_95008.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=95008

Order

5

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Numerical Analysis of Mode I Fracture Toughness for Plain Concrete Beams.

Details

Type

Article

Created At

22 Jan 2023