Abstract
Isogeometric analysis (IGA) is a newly emerging numerical method, aiming to bridge the gap between computer-aided design systems and computer-aided engineering. IGA shows many advantages compared with the traditional finite element analysis. However, in ship building industry, IGA has not got enough attention. There have been a few works that introduce IGA to hull structural analysis. However, these approaches use only shell elements to simulate stiffened shell structures, which is a great waste of computational power. In this paper, a 4 degrees-of-freedom (DOFs) Kirchhoff–Love curved shell element and a 4-DOFs Euler–Bernoulli beam element are constructed in the IGA framework, and the weighted non-symmetric Nitsche’s method is used to couple shell patches and beam patches that embedded in the former. Using the elements and coupling methods, the modeling of stiffened shell structures is greatly simplified, and the integration of modeling and analysis is realized. A cylinder stiffened shell structure and a typical hull block structure are taken as numerical examples to verify the robustness and correctness of the methods. The commercial software ANSYS 17.0 is used to obtain reference solutions. The maximum relative error of all the displacements in the two examples is 1.81% and the maximum relative error of Von-Mises stresses is 2.66%, which is acceptable in engineering.
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This work was supported by the National Natural Science Foundation of China (Grant no. 51409042).
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Wang, Y., Yu, Y. & Lin, Y. Isogeometric analysis with embedded stiffened shells for the hull structural mechanical analysis. J Mar Sci Technol 27, 786–805 (2022). https://doi.org/10.1007/s00773-021-00868-0
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DOI: https://doi.org/10.1007/s00773-021-00868-0