Abstract
In this work, a new thickness parameterization which allows for internal ply-drops without intermediate voids is introduced in the Discrete Material and Thickness Optimization (DMTO) method. With the original DMTO formulation, material had to be removed from the top in order to prevent non-physical intermediate voids in the structure. The new thickness formulation relies on a relation between density variables and ply-thicknesses rather than constitutive properties. This new formulation allows internal ply-drops which is essential for composite structures as it is common practice to cover dropped plies as to avoid delaminations. Furthermore, it is demonstrated how the new thickness formulation in some cases improves the convergence characteristics. Finally, it is also shown how solid-shell elements can be utilized within the DMTO method for structural optimization of tapered laminated composite structures.
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Acknowledgements
The second author would like to thank Science Foundation Ireland (SFI) for funding Spatially and Temporally VARIable COMPosite Structures (VARICOMP) Grant No. (15/RP/2773) under its Research Professor programme.
Funding
This work was supported by the Innovation Fund Denmark project OPTI_MADE_BLADE, grant no. 75-2014-3.
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Sjølund, J.H., Peeters, D. & Lund, E. A new thickness parameterization for Discrete Material and Thickness Optimization. Struct Multidisc Optim 58, 1885–1897 (2018). https://doi.org/10.1007/s00158-018-2093-1
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DOI: https://doi.org/10.1007/s00158-018-2093-1