PSI - Issue 60

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Procedia Structural Integrity 60 (2024) 355–363

Third International Conference on Structural Integrity 2023 (ICONS 2023) Experimental evaluation of scatter in fracture stress of silicate glass and its thickness dependence Third International Conference on Structural Integrity 2023 (ICONS 2023) Experimental evaluation of scatter in fracture stress of silicate glass and its thickness dependence

A. B. Penurkar a,b *, M. K. Samal b , A. Syed b , J. Chattopadhyay b a Division of Engineering Sciences, Homi Bhabha National Institute, Mumbai - 400094, India b Reactor Safety Division, BARC, Mumbai - 400085, India. A. B. Penurkar a,b *, M. K. Samal b , A. Syed b , J. Chattopadhyay b a Division of Engineering Sciences, Homi Bhabha National Institute, Mumbai - 400094, India b Reactor Safety Division, BARC, Mumbai - 400085, India.

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Abstract Glass is widely used in various structural application, where a transparent, durable, and stiff material is needed. Although glass is primarily not a load-bearing member in applications, however, even in common usage of glass as windows panes it is exposed to loads, such as wind loads, thermal and other mechanical loads, and may also be exposed to vibratory, impact and blast loading. However, these materials are brittle in nature and cannot withstand thermal loads beyond a certain limit. Moreover, there is a substantial scatter in their fracture stress and the median values of fracture stress is dependent upon the thickness of the specimen used in the tests. In order to study the effect of specimen thickness on fracture stress and its scatter, several experiments have been conducted on different thickness of glass material. Three point bend test was conducted on various glass specimens of 4 mm and 8 mm thickness to ascertain the scatter in the fracture strength of the glass specimen. A lot of scatter in the fracture strength of the glass specimen was observed which is attributed to the presence of micro crack on the surface of the glass specimen. Scatter in fracture stress is higher for 8 mm thickness of glass as compared to 4 mm glass specimen. It was seen that the cumulative experiment probability of fracture strength of glass follows a Weibull model. It was seen that the fracture strength of the glass reduces from 46 MPa to 40 MPa with the increase in thickness from 4 mm to 8 mm respectively indicating the decrease in fracture toughness with increasing thickness. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Abstract Glass is widely used in various structural application, where a transparent, durable, and stiff material is needed. Although glass is primarily not a load-bearing member in applications, however, even in common usage of glass as windows panes it is exposed to loads, such as wind loads, thermal and other mechanical loads, and may also be exposed to vibratory, impact and blast loading. However, these materials are brittle in nature and cannot withstand thermal loads beyond a certain limit. Moreover, there is a substantial scatter in their fracture stress and the median values of fracture stress is dependent upon the thickness of the specimen used in the tests. In order to study the effect of specimen thickness on fracture stress and its scatter, several experiments have been conducted on different thickness of glass material. Three point bend test was conducted on various glass specimens of 4 mm and 8 mm thickness to ascertain the scatter in the fracture strength of the glass specimen. A lot of scatter in the fracture strength of the glass specimen was observed which is attributed to the presence of micro crack on the surface of the glass specimen. Scatter in fracture stress is higher for 8 mm thickness of glass as compared to 4 mm glass specimen. It was seen that the cumulative experiment probability of fracture strength of glass follows a Weibull model. It was seen that the fracture strength of the glass reduces from 46 MPa to 40 MPa with the increase in thickness from 4 mm to 8 mm respectively indicating the decrease in fracture toughness with increasing thickness.

Keywords: Three point bend test, Glass testing, different glass thickness, Weibull model. Keywords: Three point bend test, Glass testing, different glass thickness, Weibull model.

* Corresponding author. Tel.: 022-2559-9295; E-mail address: anilpenur@barc.gov.in * Corresponding author. Tel.: 022-2559-9295; E-mail address: anilpenur@barc.gov.in

2452-3216© 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers 2452-3216© 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers 10.1016/j.prostr.2024.05.056