PSI - Issue 26

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Procedia Structural Integrity 26 (2020) 246–250

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© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers The main goal of the present research is to check if J-integral criterion is capable of predicting the onset of brittle fracture in key hole notched isostatic poly-granular graphite plates. In this way, this article provides the prediction of fracture loads in several key hole notched rectangular graphite specimens with five different notch tip radii subjected to pure mode I loading condition, which has been previously reported in the literature by Lazzarin et al. (2013). The fracture load predictions for five dimensional cases were obtained through the J-integral calculations. It is revealed that the J-integral criterion is capable of predicting well the fracture loads of graphite key-hole notched specimens, independent of the size of key-hole notch. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) l riterion is capable of predi ti t t ittl t i l t i t ti l l it l t . t i , t i ti l i t i ti t l i l l t t l it i it i i t t ti ii j t t l i iti , i i l t i t lit t i t l. . t l i ti i i i l t i t t i t l l l ti . t i l t t t i t l it i i l i ti ll t t l it l t i , i ndent of the size of key- l t . t . li hed by Elsevier B.V. This is an open access article under the CC BY-NC li tt :// ti . /li / / . / The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Brittle fracture prediction of key-hole notched specimens by means of J-integral expression S.M.J. Razavi a, *, H.R. Majidi b , F. Berto a a Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2b, 7491, Trondheim, Norway. b School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846, Tehran, Iran. of J-integral expression , a t t f i l I t i l i i , i i it f i l ( ), i i l i , 7491, Trondheim, Norway. b l f i l i i , I i it f i l , , , , I . Abstract i l t t i t i i t

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Peer-review under responsibility of MedFract1 organizers Keywords: Brittle fracture; J-integral; Key-hole notch; Mode I loading. : rittl fr t r ; -i t r l; - l t ; I l i .

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1. Introduction

Some notch features are not original, meaning that they are resulted from applying a repairing method to remove crack and damage emanating from the notch tip or border. For instance, if a small crack initiates from the tip of a U notch, a usual repairing method is to remove the crack by drilling a hole having the radius equal to the crack length. After the repairing process, a new notch called the key-hole notch is created. Recently, a large number of experimental t i i l, i that they are resulted from applying a repairing method to remove ti t t ti . i t , i ll i iti t t ti of a U t , l i i t i t t illi l i t i l t t l t . After the repairing , t ll t l t i t . tl , l i t l t t

* Corresponding author. Tel.: +47-930-24492. E-mail address: javad.razavi@ntnu.no i t r. l.: - - . - il : j .r i t . rr

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers l i . . i i ti l t li tt :// ti . /li / / . / i i ilit t i - t . li

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 10.1016/j.prostr.2020.06.030