Techno Press
Techno Press

Structural Engineering and Mechanics   Volume 20, Number 4, July10 2005, pages 451-463
DOI: http://dx.doi.org/10.12989/sem.2005.20.4.451
 
Transient energy flow in ship plate and shell structures under low velocity impact
Z. S. Liu, S. Swaddiwudhipong, C. Lu and J. Hua

 
Abstract     [Full Text]
    Structural members commonly employed in marine and off-shore structures are usually fabricated from plates and shells. Collision of this class of structures is usually modeled as plate and shell structures subjected to dynamic impact loading. The understanding of the dynamic response and energy transmission of the structures subjected to low velocity impact is useful for the efficient design of this type of structures. The transmissions of transient energy flow and dynamic transient response of these structures under low velocity impact are presented in the paper. The structural intensity approach is adopted to study the elastic transient dynamic characteristics of the plate structures under low velocity impact. The nine-node degenerated shell elements are adopted to model both the target and impactor in the dynamic impact response analysis. The structural intensity streamline representation is introduced to interpret energy flow paths for transient dynamic response of the structures. Numerical results, including contact force and transient energy flow vectors as well as structural intensity stream lines, demonstrate the efficiency of the present approach and attenuating impact effects on this type of structures.
 
Key Words
    dynamic response; finite element method; low velocity impact; plate and shell structures; structural intensity.
 
Address
Z. S. Liu; Computational Solid Mechanics, Institute of High Performance Computing, 1 Science Park Road, #01-01, Singapore Science Park II, 117528, Singapore
S. Swaddiwudhipong; Department of Civil Engineering, National University of Singapore, Kent Ridge, 119260, Singapore
C. Lu; Computational Solid Mechanics, Institute of High Performance Computing, 1 Science Park Road, #01-01, Singapore Science Park II, 117528, Singapore
J. Hua; Department of Civil Engineering, National University of Singapore, Kent Ridge, 119260, Singapore
 

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