A strength optimization approach for manufacturable 3D printed variable stiffness laminates with a strain-based approximation

Hong，Zhi1; Xiong，Yi2; Liang，Ke3; Fan，Congze4; Guo，Yujie5

2024-05-15

10.1016/j.compstruct.2024.117999

Composite Structures   影响因子和分区

0263-8223

The 3D printed continuous carbon fiber reinforced polymers (CFRP) are promising lightweight structures with outstanding mechanical performance. In this work, we propose a structure-manufacture integrated optimization approach for strength maximization of variable stiffness 3D printed CFRP composites by tailoring the steered printing paths. The rule of mixture is modified to evaluate material properties and strength of the printed laminates considering the effect of fiber volume fraction. To make this approach applicable to CFRP with asymmetric layups, a strain-based two-level convex approximation for the failure index based on the Tsai–Wu failure criterion is proposed, which can take the tension-bending coupling effect into consideration. The local failure indices are aggregated using the p-norm formula to reduce the size of the strength optimization model. In order to guarantee the manufacturability of the optimal design, the curvature of the steered printing fiber paths is constrained using a hybrid control method within the approach. The numerical cases show that the strength enhancement of the 3D printed variable stiffness laminates depends on the load, where an improvement between 35% and 46% can be achieved under the tension. Moreover, the proposed method can not only converge stably, but also be capable of optimizing structures with complex geometry.

Strain-based strength approximation Strength optimization Structure-manufacture integrated optimization approach Tsai–Wu failure criterion Variable stiffness 3D printed CFRP

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85187794591

Scopus

1.School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou,No. 1158 No. 2 Avernue Xiasha Higher Education Zone, Zhejiang Province,310018,China
2.School of System Design and Intelligent Manufacturing,Southern University of Science and Technology,Shenzhen,No. 1088 Xueyuan Avenue, Guangdong Province,518055,China
3.School of Aeronautics,Northwestern Polytechnical University,Xi'an,No. 127 West Youyi Road, Shan'anxi Province,710072,China
4.School of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,No. 29 Yudao Street, Jiangsu Province,210016,China
5.State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,No. 29 Yudao Street, Jiangsu Province,210016,China

Hong，Zhi,Xiong，Yi,Liang，Ke,et al. A strength optimization approach for manufacturable 3D printed variable stiffness laminates with a strain-based approximation[J]. Composite Structures,2024,336.

Hong，Zhi,Xiong，Yi,Liang，Ke,Fan，Congze,&Guo，Yujie.(2024).A strength optimization approach for manufacturable 3D printed variable stiffness laminates with a strain-based approximation.Composite Structures,336.

Hong，Zhi,et al."A strength optimization approach for manufacturable 3D printed variable stiffness laminates with a strain-based approximation".Composite Structures 336(2024).