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Applicability of compact tension specimens for evaluation of the plane-strain fracture toughness of steel

  • Sedat İriç , Oğuzhan Demir and Ali O. Ayhan
Published/Copyright: November 18, 2019
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Abstract

The plane-strain fracture toughness test method enables the determination of the plane-strain fracture toughness (KIC) of metallic materials by tests using a variety of precracked specimens, such as bend, compact tension (CT), arc-shaped, disk-shaped specimens. In this study, to determine the effect of the heat treatment process on the specimen thickness required for a valid plane-strain test in accordance with the ASTM standard, fracture tests are performed by using CT specimens made of AISI 1040 carbon steel. Furthermore, by taking into consideration the effect of residual stress caused by heat treatment in the vicinity of the notch, additional fracture tests are also performed. The specimens are machined from rolled plates in the L-T rolling direction (crack plane is perpendicular to the rolling direction). Having performed experimental analyses, the applicability of the plane-strain fracture toughness tests using CT specimen made of AISI 1040 steel is investigated.


*Correspondence Address, Dr. Ali O. Ayhan, Mechanical Engineering Department, Sakarya University, 54187 Sakarya, Turkey, E-mail:

Assist. Prof. Dr. Sedat Iric, born in 1976, completed his PhD at Sakarya University in Sakarya, Turkey. Currently, he is working as Assistant Professor in the Department of Mechanical Engineering of Sakarya University. His research interests cover the fields of fatigue, fracture mechanics, computer aided design and manufacturing and automation.

Assist. Prof. Dr. Oguzhan Demir, born in 1986, graduated with a Bachelor's degree in Mechanical Engineering from Selçuk University, Konya, Turkey in 2009. He completed his Master of Science in Mechanical and Manufacturing Engineering at Bilecik Seyh Edebali University, Bilecik, Turkey in 2012. He received his PhD in Mechanical Engineering from Sakarya University, Sakarya, Turkey. Presently, he is working as Assistant Professor in the Department of Mechanical Engineering, Bilecik Seyh Edebali University, Bilecik, Turkey. His research field includes computational and experimental fracture mechanics and non-planar crack propagation analyses.

Prof. Dr. Ali O. Ayhan graduated from the Istanbul Technical University Mechanical Engineering Faculty in 1993 as the top-ranking graduate. He received his Master of Science (1997) and PhD (2000) in Mechanical Engineering from Lehigh University, USA. During his graduate studies he worked on three-dimensional fracture problems and developed FRAC3D software which is a stand-alone fracture analysis program able to solve three-dimensional fracture mechanics problems for cracks in various media. During his graduate studies, Dr. Ayhan focused, especially, on analyses of interface cracks in electronic packages. After receiving his PhD, he joined the General Electric Global Research Center in 2000 and worked for the company until 2007 on a variety of research and development projects. In October 2007, Dr. Ayhan became an Assistant Professor in Mechanical Engineering Department at Cukurova University. He is currently a Professor in Mechanical Engineering Department at Sakarya University and continues his studies in the area of computational and experimental fracture mechanics.


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Published Online: 2019-11-18
Published in Print: 2019-12-02

© 2019, Carl Hanser Verlag, München

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