PSI - Issue 48

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 48 (2023) 12–18

© 2023 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 IRAS 2023 organizers Abstract In general, ship structural integrity assessments consist of prescribed procedures given by the rules of classification societies, and if necessary, direct calculations. Direct calculations mostly include longitudinal strength analyses and buckling calculations for various service loadings and structural members. Resulting stress is compared to the allowable stress, which is also rule-prescribed and acts as a share of the yield stress of the material. This means that the structure is evaluated upon its elastic response. Moreover, ship structural assessments consider as-built scantlings, not diminished by ageing. Generally, extreme or once-in-a-lifetime loadings are neglected. They can include overloading scenarios that lead to the ship structural collapse or the loss of the shi p’s carrying capacity, i.e., ultimate strength. Ultimate strength of the ship is represented by the maximum (ultimate) bending moment the structure can withstand. Its evaluation is important to determine the ship’s structural safety level with respect to i ts collapse. Therefore, this paper delivers the ultimate strength assessment for a typical bulk carrier having 180 m in length. For this purpose, an incremental-iterative progressive collapse analysis (PCA) is used. In the first stage, ultimate strength of a bulk carrier is determined using as-built scantlings. In the next, ageing effects are considered within PCA by modeling scenarios that include both pitting and uniform corrosion. Pitting corrosion is defined by pitting intensity degree (DOP) and corrosion intensity degree (DOC), whilst the uniform corrosion is defined by thickness reduction. Results show that corrosion effects can significantly diminish the ultimate strength of the ship. This means that, in the design phase, structural assessments cannot be based just on as-built scantlings, but also might include ageing effects, as ships are designed to be reliable on the long-term. © 2023 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 IRAS 2023 organizers Keywords: ultimate strength; bulk carrier; progressive-collapse; ultimate bending moment; corrosion wastage; hull girder; ship ageing. Abstract In general, ship structural integrity assessments consist of prescribed procedures given by the rules of classification societies, and if necessary, direct calculations. Direct calculations mostly include longitudinal strength analyses and buckling calculations for various service loadings and structural members. Resulting stress is compared to the allowable stress, which is also rule-prescribed and acts as a share of the yield stress of the material. This means that the structure is evaluated upon its elastic response. Moreover, ship structural assessments consider as-built scantlings, not diminished by ageing. Generally, extreme or once-in-a-lifetime loadings are neglected. They can include overloading scenarios that lead to the ship structural collapse or the loss of the shi p’s carrying capacity, i.e., ultimate strength. Ultimate strength of the ship is represented by the maximum (ultimate) bending moment the structure can withstand. Its evaluation is important to determine the ship’s structural safety level with respect to i ts collapse. Therefore, this paper delivers the ultimate strength assessment for a typical bulk carrier having 180 m in length. For this purpose, an incremental-iterative progressive collapse analysis (PCA) is used. In the first stage, ultimate strength of a bulk carrier is determined using as-built scantlings. In the next, ageing effects are considered within PCA by modeling scenarios that include both pitting and uniform corrosion. Pitting corrosion is defined by pitting intensity degree (DOP) and corrosion intensity degree (DOC), whilst the uniform corrosion is defined by thickness reduction. Results show that corrosion effects can significantly diminish the ultimate strength of the ship. This means that, in the design phase, structural assessments cannot be based just on as-built scantlings, but also might include ageing effects, as ships are designed to be reliable on the long-term. © 2023 The Authors. Published by ELSEVIER B.V. Keywords: ultimate strength; bulk carrier; progressive-collapse; ultimate bending moment; corrosion wastage; hull girder; ship ageing. Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Pitting and uniform corrosion effects on ultimate strength of a bulk carrier Nikola Mom čilović a, * , Nemanja Ilić a , Milan Kalajdžić a , Špiro Ivošević b , Ana Petrović a Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Pitting and uniform corrosion effects on ultimate strength of a bulk carrier Nikola Mom čilović a, * , Nemanja Ilić a , Milan Kalajdžić a , Špiro Ivošević b , Ana Petrović a a University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade 11120, Serbia b University of Montenegro, Faculty of Maritime Studies, Put I Bokeljske brigade 44, Kotor 85331, Montenegro a University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade 11120, Serbia b University of Montenegro, Faculty of Maritime Studies, Put I Bokeljske brigade 44, Kotor 85331, Montenegro

* Corresponding author. E-mail address: nmomcilovic@mas.bg.ac.rs * Corresponding author. E-mail address: nmomcilovic@mas.bg.ac.rs

2452-3216 © 2023 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 IRAS 2023 organizers 2452-3216 © 2023 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 IRAS 2023 organizers

2452-3216 © 2023 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 IRAS 2023 organizers 10.1016/j.prostr.2023.07.104