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169663

Some Observations on the Fracture Characteristics and Fatigue Crack Growth Rates in a High Strength Aluminum Alloy.

Article

Last updated: 22 Jan 2023

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Subjects

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Tags

Production Engineering and Mechanical Design

Abstract

Because of the importance of assessing the structural integrity and life expectancy of engineering components, there has been considerable effort in the last thirty years in the characterization of fatigue cracking and fracture resistance for different structural materials. The present study is directed to the determination of the type of dependence of the fracture resistance and the fatigue crack initiation and propagation behavior on previous heat treatment performed on the material. 
High strength aluminum alloy, type 7075, has been selected as the test material. A successful T6 treatment, consisting of solution treatment followed by quenching and an aging period, results generally in good strength and toughness properties. Aging temperature was kept constant while aging time was varied from two to ten hours. Single-edge notched specimens have been used for fatigue crack propagation tests while double-edge notched specimens have been used for fracture toughness tests. 
Test results indicate that variation in the aging time for the alloy results in an appreciable variation in its fracture toughness and the rate of crack growth. Longer aging periods lead to higher crack growth rates and lower fracture toughness. The test results may be explained as being due to variations in the local driving force acting at the crack tip. This force is known to be influenced by several factors such as crack closure, cyclic plasticity, and crack deviation from its regular growth direction. 

DOI

10.21608/bfemu.2021.169663

Keywords

Fatigue Crack Growth, Fracture mechanics, Fracture Toughness, Aluminum alloy, precipitation hardening, crack growth gauge

Authors

First Name

Mohamed

Last Name

Shabara

MiddleName

-

Affiliation

Lecturer at Industrial Production Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

-

City

Mansoura

Orcid

-

First Name

Ahmed

Last Name

Mostafa

MiddleName

Abd El-Fattah

Affiliation

Industrial Production Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Email

-

City

Mansoura

Orcid

-

Volume

16

Article Issue

1

Related Issue

24660

Issue Date

1991-05-01

Receive Date

1991-01-09

Publish Date

2021-05-01

Page Start

11

Page End

25

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 16_Issue 1_Pages 11-25.pdf

PDF . 176.5kB

Link

https://bfemu.journals.ekb.eg/article_169663.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=169663

Order

17

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

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

MainTitle

-

Details

Type

Article

Created At

22 Jan 2023