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An investigation on design of signs in composite laminates to control bending-twisting coupling effects using sign optimization algorithm

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Abstract

A sign optimization algorithm (SOA) is proposed to design the “±” signs in composite laminates to control the bending-twisting coupling effects. Owing to that the bending-twisting coupling stiffness are cubic on thickness, the innovation is to design the signs of ply orientations from the mid-plane to the outermost sequentially and iteratively. In this manner, the nondimensional anisotropic coefficients are controlled to the target values. Numerical examples are adopted to verify the effectiveness and efficiency of SOA. First, the signs of symmetric laminates [θ32]s are optimized with various boundaries, load ratios, and aspect ratios to show the bending-twisting coupling effects on bending, buckling, and vibration responses of composite plates. Second, the bending-twisting coupling effects are minimized since they may cause large errors in buckling load prediction when using closed-form solution after neglecting them. Third, the optimal sequences obtained from heuristic algorithms are employed for sign optimization. Results show that the bending-twisting coupling effects cannot be neglected; moreover, the buckling and vibration performances can be further improved by redesigning “±” signs in composite laminates. This research aims to provide a design technique to minimize the error induced by bending-twisting coupling and increase the probability to find the global optimum.

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Acknowledgments

This work is supported by the Project funded by the National Natural Science Foundation of China (No. 11572134) and the Project funded by China Postdoctoral Science Foundation (No. 2017M612443).

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Correspondence to Zhao Jing or Jianqiao Chen.

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Appendix

Appendix

The laminate [308]s is adopted for the implementation of SOA. Detailed sign optimization process please see Table 10: with the sign exchanging from the mid-plane to the outermost, ω decreases gradually to a small value and then ω increases. To further decrease ω, the exchanging position turns to the mid-plane again and the above exchanging process is repeated until ω converges. The exchanged ply orientations are highlighted in grey background. Only 24 times of objective function evaluations can generate the final optimum.

Table 10 Sign optimization process for laminates [308]s

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Jing, Z., Chen, J. An investigation on design of signs in composite laminates to control bending-twisting coupling effects using sign optimization algorithm. Struct Multidisc Optim 60, 2131–2156 (2019). https://doi.org/10.1007/s00158-019-02315-6

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  • DOI: https://doi.org/10.1007/s00158-019-02315-6

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