Details
| Original language | English |
|---|---|
| Article number | 110928 |
| Journal | Composite structures |
| Volume | 222 |
| Early online date | 27 Apr 2019 |
| Publication status | Published - 15 Aug 2019 |
Abstract
Fiber steering is an outstanding capability for producing composite structures with spatially tailored properties. The ability of tailoring the reinforcement arbitrarily in the space generates laminate with variable-stiffness, possessing substantial scope for outperforming traditional constant-stiffness laminates. This investigation presents a methodology to optimize composite cylinders with a variable-axial (also known as variable angle-tow and variable-stiffness) layout under axial compression for the adopted design space, loads and boundary conditions, using a novel optimization concept based on the manufacturing characteristics of the Tailored Fiber Placement (TFP) process. Next, a post-buckling analysis is carried out in order to make a first assessment of the imperfection sensitivity of the cylinders. The current approach locally optimizes both thickness and fiber angle of each finite element (FE), where thickness accumulation is reached through a smooth overlapping of rovings, a typical characteristic of TFP process. The optimized cylinders have significantly higher linear buckling loads than the corresponding initial layouts and are less sensitive to affine initial geometrical imperfections. The current work on optimization of the linear buckling behavior of variable-axial (VA) shells shows both the potential of using VA-configurations to exploit their tailoring ability and the capabilities of the current optimization framework to improve and optimize the behavior of VA structures.
Keywords
- Buckling, Cylinder, Optimization, Variable angle tow, Variable-axial layout, Variable-stiffness
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Civil and Structural Engineering
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In: Composite structures, Vol. 222, 110928, 15.08.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Buckling optimization of composite cylinders for axial compression
T2 - A design methodology considering a variable-axial fiber layout
AU - Almeida, José Humberto S.
AU - Bittrich, Lars
AU - Jansen, Eelco
AU - Tita, Volnei
AU - Spickenheuer, Axel
N1 - Funding Information: J.H.S. Almeida Jr. thanks Alexander von Humboldt Stiftung and CAPES for the financial support; V. Tita acknowledges the financial support of CNPq (process number: 428591/2016-7 and 310656/2018-4).
PY - 2019/8/15
Y1 - 2019/8/15
N2 - Fiber steering is an outstanding capability for producing composite structures with spatially tailored properties. The ability of tailoring the reinforcement arbitrarily in the space generates laminate with variable-stiffness, possessing substantial scope for outperforming traditional constant-stiffness laminates. This investigation presents a methodology to optimize composite cylinders with a variable-axial (also known as variable angle-tow and variable-stiffness) layout under axial compression for the adopted design space, loads and boundary conditions, using a novel optimization concept based on the manufacturing characteristics of the Tailored Fiber Placement (TFP) process. Next, a post-buckling analysis is carried out in order to make a first assessment of the imperfection sensitivity of the cylinders. The current approach locally optimizes both thickness and fiber angle of each finite element (FE), where thickness accumulation is reached through a smooth overlapping of rovings, a typical characteristic of TFP process. The optimized cylinders have significantly higher linear buckling loads than the corresponding initial layouts and are less sensitive to affine initial geometrical imperfections. The current work on optimization of the linear buckling behavior of variable-axial (VA) shells shows both the potential of using VA-configurations to exploit their tailoring ability and the capabilities of the current optimization framework to improve and optimize the behavior of VA structures.
AB - Fiber steering is an outstanding capability for producing composite structures with spatially tailored properties. The ability of tailoring the reinforcement arbitrarily in the space generates laminate with variable-stiffness, possessing substantial scope for outperforming traditional constant-stiffness laminates. This investigation presents a methodology to optimize composite cylinders with a variable-axial (also known as variable angle-tow and variable-stiffness) layout under axial compression for the adopted design space, loads and boundary conditions, using a novel optimization concept based on the manufacturing characteristics of the Tailored Fiber Placement (TFP) process. Next, a post-buckling analysis is carried out in order to make a first assessment of the imperfection sensitivity of the cylinders. The current approach locally optimizes both thickness and fiber angle of each finite element (FE), where thickness accumulation is reached through a smooth overlapping of rovings, a typical characteristic of TFP process. The optimized cylinders have significantly higher linear buckling loads than the corresponding initial layouts and are less sensitive to affine initial geometrical imperfections. The current work on optimization of the linear buckling behavior of variable-axial (VA) shells shows both the potential of using VA-configurations to exploit their tailoring ability and the capabilities of the current optimization framework to improve and optimize the behavior of VA structures.
KW - Buckling
KW - Cylinder
KW - Optimization
KW - Variable angle tow
KW - Variable-axial layout
KW - Variable-stiffness
UR - http://www.scopus.com/inward/record.url?scp=85065143044&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2019.110928
DO - 10.1016/j.compstruct.2019.110928
M3 - Article
AN - SCOPUS:85065143044
VL - 222
JO - Composite structures
JF - Composite structures
SN - 0263-8223
M1 - 110928
ER -