A Study on the Buckling Strength of Bow Structures Subjected to Bow Flare Impact Force
Date Issued
2010
Date
2010
Author(s)
Yang, Shun-Han
Abstract
The objective of this paper is to analyze the structural dynamic buckling strength of simply supported square plates and container ship bow structures subjected to impact force by using finite element analysis method. The results reveal that impact force integration under impact force-time curve is the most important factor to determine structure dynamic buckling.
Plate structure has been widely employed in various areas due to its prominence of high load-bearing ability. In respect of plate structure, finite element software ABAQUS is used to execute the nonlinear dynamic analysis for investigating the dynamic buckling strength. The results of numerical simulation are compared with Kirchhoff-Love plate theory and structure dynamic theory to demonstrate the validity and reliability of the analysis schemes. Two alternative criteria, linear curve fitting method and one-time thickness deformation method, are utilized to determine the critical dynamic buckling strength. The study inspects the influence of impact force parameters on dynamic buckling behavior of plates: force type, peak value, duration time and impact force integration. Finally, the results show that impact force integration is a crucial factor to cause structure dynamic buckling happened.
Damages on containership bow structures have happened frequently and the reviewing of ISSC 1991 indicated 90% of the damages were caused by wave impact loads. Therefore, the investigation of bow structure’s response due to impact load is hence becoming very important and the knowledge for improving bow structure design is widely needed. In respect of bow structure, dynamic buckling phenomenon is also discussed in various aspects, such as buckling strength criterion, slamming pressure and duration time. Besides, the software package MSC/Marc is employed to perform the nonlinear dynamic transient analysis for investigating the response of containership’s bow structures; and the impact load value is obtained by using slamming impact loads formula of LR Rules. Buckling mode, nonlinear buckling deformation and stress distribution were assessed for various impact conditions. The results also conclude that model’s difference, force type, duration time and impact force integration are four significant factors of bow structures dynamic buckling strength.
Subjects
structural dynamic buckling
impact load
duration time
impact force integration
finite element method
bow structure
Type
thesis
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