A study on ice−structure interaction modelling for collision assessment of marine structures and ice-ridges
Başlık çevirisi mevcut değil.
- Tez No: 402738
- Danışmanlar: PROF. PAIK JEOM KEE
- Tez Türü: Doktora
- Konular: Gemi Mühendisliği, Marine Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Pusan National University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Deniz Teknolojisi Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 125
Özet
Özet yok.
Özet (Çeviri)
Possible ice-ridge collisions and ice-infested seawater are challenging for marine structures. Therefore, an accurate computational model for ice –structure interaction is necessary. The primary objectives of the present thesis are: Creation of a numerical model of ice and steel materials associated with the collisions Validation of the model by experiments Comparison of the behaviour of the new proposed ice model with the rigid body model Application of the new ice model to the assessment of collisions between ice-ridges and marine structures. Although a number of models for steel materials exist, after an analysis it was concluded that no accurate and holistic model for ice is available. The parameters affecting the mechanical properties of ice are discussed in this study. In addition, the existing test database associated with the mechanical properties of ice was studied thoroughly, and a new ice compression test database is obtained by laboratory testing. By using the existing and the new test database, the KOSORI ice model was created, which originates from a modified Johnson-Cook constitutive equation and a rate depended discrete element model for fracture mechanics. The model considers ice mechanic in terms of influencing parameters such as strain rate, temperature and salinity. The new constitutive ice model was implemented in the non-linear finite element code as a subroutine. Furthermore, two sets of experiments are performed. In the first set of experiments, ice was dropped on a steel plate from 2 meters, and in the second one a rigid body is dropped on a steel plate under the same conditions. Both results are compared to see the differences between ice responses on steel plate and rigid body responses on steel plate. Thus, the computational results of the new ice model are validated against the experimental results of ice drop test. In addition, two cases of collisions of an ice-ridge with marine structures are studied using the proposed ice model as well as the rigid body model. This includes FLNG and semi-submersible – ice-ridge collisions. Although the resulting maximum contact forces for both rigid model and the KOSORI ice model are same, the deflections on the side of marine structures are almost ten times bigger when using rigid body model. As the collision event at sea involves a fluid structure interaction (FSI), additional work such as the external dynamics study of the ice-ridges – marine structures are necessary in the future, thus providing more reliable approach and methodology.
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