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Optimum weight of the torsion box, in terms of fatigue life, of an ultra large container ship
Published in J. Parunov, C. Guedes Soares, Trends in the Analysis and Design of Marine Structures, 2019
A. Silva-Campillo, M.A. Herreros-Sierra, J.C. Suárez-Bermejo
Due to the high concentration of stresses in the torsion box, the phenomenon of fatigue will be significantly increased and for that fatigue stresses must have a special consideration (Barhoumi et al. 2014; Fricke et al. 2012; Fukusaka et al. 2014; Hyun et al. 2009; Hyun et al. 2010; Li et al. 2013; Mao et al. 2015).
Structural design and analyses of a fabric-covered wind turbine blade
Published in Advanced Composite Materials, 2019
Dong-Guk Choi, Chan-Ho Kwak, Soo-Yong Lee, Jae-Sung Bae, Hak-Gu Lee
We designed the fabric-covered WT blade based on the structural concept of an aircraft wing, taking into account the different loading conditions between the two structures. A WT blade experiences large torsional moments compared to an aircraft wing. Although an aircraft wing is designed to have a torsion box structure like that in Figure 4 or a separate main and rear spar structure, a WT blade should need an additional C-spar structure, as shown in Figure 5(a), to sustain relatively large torsional moments. The first candidate was designated as Type 1 in Figure 5(a). It had a torsion box combined with an additional C-spar and was vulnerable to buckling due to the thin and wide spar caps at the top and bottom of the torsion box. The second candidate was designated as Type 2 in Figure 5(b). It had thick and narrow spar caps with an additional C-spar, and it had lower edgewise bending stiffness. Thus, we added a rear spar to the second candidate, Type 3 in Figure 5(c), composed of one C-spar, one hollow main spar, and one rear spar.
Ultimate strength characteristics of as-built ultra-large containership hull structures under combined vertical bending and torsion
Published in Ships and Offshore Structures, 2020
In contrast to oil tankers without deck openings where the effects of torsional moments are often negligible, containerships have large deck openings that reduce the torsional rigidity of the entire ship hull structure, and the hull girder collapse of ultra-large containerships under combined vertical bending and torsional moments is a primary concern. The structural design concept of a torsion box is applied to increase the torsional rigidity of containership hull structures where very thick plates are mounted in the corners of deck openings (Hughes and Paik 2013). Classical theory tells that both shear and warping stresses developed in a box girder due to torsion can of course affect the bending response (Vlasov 1959).