Abstract
A simple analytical model to estimate the longitudinal strength of ship hulls in composite materials under buckling, material failure and ultimate collapse is presented in this paper. Ship hulls are regarded as assemblies of stiffened panels which idealized as group of plate-stiffener combinations. Ultimate strain of the plate-stiffener combination is predicted under buckling or material failure with composite beam-column theory. The effects of initial imperfection of ship hull and eccentricity of load are included. Corresponding longitudinal strengths of ship hull are derived in a straightforward method. A longitudinally framed ship hull made of symmetrically stacked unidirectional plies under sagging is analyzed. The results indicate that present analytical results have a good agreement with FEM method. The initial deflection of ship hull and eccentricity of load can dramatically reduce the bending capacity of ship hull. The proposed formulations provide a simple but useful tool for the longitudinal strength estimation in practical design.
References
[1] Caldwell J. Ultimate longitudinal strength. Trans Roy Inst Naval Arch 1965; 107: 411-30.Search in Google Scholar
[2] Smith C S. Influence of local compressive failure on ultimate longitudinal strength of a Ship’s hull. In: Proceedings of 3th international symposium on practical design in shipbuilding; 1977. p. 73-9.Search in Google Scholar
[3] Dow, R.S., Hugill, R.C., Clarke, J.D., Smith, C.S., 1981. Evaluation of ultimate ship hull strength, In: Proceedings of the 10th SNAME Extreme Loads Response Symposium, Arlington, Virginia, pp. 133-148.Search in Google Scholar
[4] Ueda, Y., Yao, T., 1982. The plastic node method-a new method of plastic analysis. Comput. Meth. Appl. Mech. Eng 34, 1089-110410.1016/0045-7825(82)90103-7Search in Google Scholar
[5] Viner A C. Development of ship strength formulations. In: Proceedings of the international conference on advances inmarine structures. London (New York): Elsevier; 1986.Search in Google Scholar
[6] Khedmati M.R. Simulation of average stress average strain relationship of ship unstiffened /stiffened plates subject to in plane compression, Sci. Iran. 12 (4) (2005) 359-367.Search in Google Scholar
[7] Frieze PA, Lin YT. Ship longitudinal strength modelling for reliability analysis. In: Proceedings of the marine structural inspection, maintenance and monitoring symposium, SNAME; 1991.Search in Google Scholar
[8] Paik J K, Mansour A E. A simple formulation for predicting the ultimate strength of ships. J Marine Sci Technol 1995; 1:52-62.10.1007/BF01240013Search in Google Scholar
[9] Garbatov Y, Saad-Eldeen S, Guedes Soares C. Hull girder ultimate strength assessment based on experimental results and the dimensional theory. Engineering Structures. 2015; 100: 742-75010.1016/j.engstruct.2015.06.003Search in Google Scholar
[10] Paik JK, Thayamballi A K. Ultimate limit state design of steel plated structures. Chichester (UK): Wiley; 2003.Search in Google Scholar
[11] Hughes OF, Paik JK. Ship structural analysis and design. Washington DC: SNAME; 2013Search in Google Scholar
[12] Paik JK, Kim DK, Park DH, Kim HB,Mansour AE, Caldwell JB. Modified Paik-Mansour formula for ultimate strength calculations of ship hulls. Ships Offshore Struct 2013; 8(3-4): 245-6010.1080/17445302.2012.676247Search in Google Scholar
[13] Chen N Z , Sun H H , Guedes Soares C. Reliability analysis of a ship hull in composite material, Compos. Struct. 2003; 62 (1): 59-66.Search in Google Scholar
[14] Chen N Z, Guedes Soares C. Longitudinal strength analysis of ship hulls of composite materials under sagging moments, Compos. Struct. 2007; 77 (1): 36-44.Search in Google Scholar
[15] Chen N Z, Guedes Soares C. Ultimate longitudinal strength of ship hulls of compositematerials, J. Ship Res. 2008; 52 (3): 184-19310.5957/jsr.2008.52.3.184Search in Google Scholar
[16] Morshedsoluk F, Khedmati M R. Ultimate strength of composite ships’ hull girders in the presence of composite superstructures. Thin-Walled Structures. 2016; 102: 122-138.10.1016/j.tws.2016.01.024Search in Google Scholar
[17] Smith C S. Design of marine structures in composite materials. Elsiver Applied Science, London, 1990Search in Google Scholar
[18] China Aviation Academy. Guidelines for stability analysis of composite structures (in Chinese). Aviation Industry Press. 2002Search in Google Scholar
[19] Wang Yaoxian. Structural design of Compositematerials (in Chinese). Chemical Industry Press. 2002Search in Google Scholar
[20] Li Shunlin. Fundamentals of Structural design of Compositematerials (in Chinese). Wuhan University of Technology Press. 1993Search in Google Scholar
[21] Tsai SW, Wu EM. A general theory for strength for anisotropic materials. J Compos Mater. 1971; 5: 58-80.10.1177/002199837100500106Search in Google Scholar
[22] Brian J. Jones. Design Equations and Criteria of Orthotropic Composite Panels. NSWCCD-65-TR-2004/16 June 2004Search in Google Scholar
© 2017
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
