PSI - Issue 27

Available online at www.sciencedirect.com Structural I t gri y Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 27 (2020) 22–29

© 2020 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 organizers of ICIMECE2020 Abstract The dynamic characteristic of interfacial debonded Ferry Ro- Ro’s stern ramp/door is studied by using finite element software ABAQUS. The effect of debonding on vibration responses of damaged stern ramp/doors is assessed by comparing numerical parameters of natural frequency shifts between intact and damaged models. Parametric studies over a wide range of debonding shapes to explore the influence of this parameter on the overall dynamic behavior of the models are investigated. Boundary conditions describing the loading conditions of the ship are evaluated. Four different debonding shapes with a similar debonding ratio, such as circular, square, through-the-length, and through-the-width, are investigated. To evaluate the effect of modeling techniques, both debonding shapes with and without spring contact element models are examined. Consequently, natural frequencies shift is being determined as functions of these parameters that enable to conclude the influence of debonding. The result has been shown that the debonding defect reduced the natural frequencies, especially in the square and circular debonding shapes. There is no significant frequency shift in the through-the-length, and through-the-width debonding modeling. Neglecting of contact leads to incorrect results, which significantly overestimate the value of natural frequency, so the spring contact modeling is recommended. The higher natural frequencies are found to be more sensitive to the presence of debonding problems. Using natural frequency shifts directly resulting from both intact and debonded models, the diagnostic can be performed. © 2020 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 the responsibility of the organizers of ICIMECE2020 Keywords: sandwich, ramp door, ferry ro-ro, debonding, free vibration analysis 6th International Conference on Industrial, Mechanical, Electrical and Chemical Engineering (ICIMECE 2020) Free Vibration Analysis of Interfacial Debonded Sandwich of Ferry Ro- Ro’s Stern Ramp Door Tuswan Tuswan a , Achmad Zubaydi a, *, Bambang Piscesa b , Abdi Ismail a , Muhammad Fathi Ilham a a Department of Naval Architecture, Institut Teknologi Sepuluh Nope ber, Surabaya 60111, Indonesia b Department of Civil Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia Abstract The dynamic characteristic of interfacial debonded Ferry Ro- Ro’s stern ramp/door is studied by using finite element software ABAQUS. The effect of debonding on vibration responses of damaged stern ra p/doors is assessed by comparing numerical parameters of natural frequency shifts between intact and damaged models. Parametric studies over a wide range of debonding shapes to explore the influence of this parameter on the overall dynamic behavior of the models are investigated. Boundary conditions describing the loading conditions of the ship are evaluated. Four different debonding shapes with a similar debonding ratio, such as circular, square, through-the-length, and through-the-width, are investigated. To evaluate the effect of modeling techniques, both debonding shapes with and without spring contact element models are examined. Consequently, natural frequencies shift is being determined as functions of these parameters that enable to conclude the influence of debonding. The result has been shown that the debonding defect reduced the natural frequencies, especially in the square and circular debonding shapes. There is no significant frequency shift in the through-the-length, and through-the-width debonding modeling. Neglecting of contact leads to incorrect results, which significantly overestimate the value of natural frequency, so the spring contact modeling is recommended. The higher natural frequencies are found to be more sensitive to the presence of debonding problems. Using natural frequency shifts directly resulting from both intact and debonded models, the diagnostic can be performed. © 2020 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 the responsibility of the organizers of ICIMECE2020 Keywords: sandwich, ramp door, ferry ro-ro, debonding, free vibration analysis 6th International Conference on Industrial, Mechanical, Electrical and Chemical Engineering (ICIMECE 2020) Free Vibration Analysis of Interfacial Debonded Sandwich of Ferry Ro- Ro’s Stern Ramp Door Tuswan Tuswan a , Achmad Zubaydi a, *, Bambang Piscesa b , Abdi Ismail a , Muhammad Fathi Ilham a a Department of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia b Department of Civil Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia

* Corresponding author. Tel.: 031-5947254; fax: 031-5964182 E-mail address: zubaydi@na.its.ac.id * Corresponding author. Tel.: 031-5947254; fax: 031-5964182 E-mail address: zubaydi@na.its.ac.id

2452-3216 © 2020 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 the responsibility of the organizers of ICIMECE2020 2452-3216 © 2020 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 the responsibility of the organizers of ICIMECE2020

2452-3216 © 2020 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 organizers of ICIMECE2020 10.1016/j.prostr.2020.07.004