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<p>Composite laminated shells are widely utilized in structural applications due to their superior mechanical properties. Among these configurations, asymmetric stacking sequence designs for extension–shearing coupled laminated spherical shells demonstrate distinct advantages in expanding fiber design space and enhancing structural mechanical performance. However, their practical implementation remains constrained by susceptibility to hygro-thermal-induced curing deformations. To elucidate the hygro-thermal stability mechanisms of asymmetric laminated shells, this study systematically derives stiffness equations and thermal force/moment components through rigorous consideration of geometric curvature effects. Subsequent formulation establishes an analytical stability criterion for hygro-thermal shearing stability in extension–shearing coupled laminated spherical shells by integrating geometric factors and material constants. Leveraging this stability condition as a constraint, an asymmetric stacking optimization model is developed with the extension–shearing coupling effect as the objective function. Through sequential quadratic programming optimization, stacking sequences maximizing adaptive deformation capacity while maintaining hygro-thermal stability are generated. Comprehensive numerical validation and robustness analyses confirm the theoretical framework’s validity and engineering applicability. Results indicate that asymmetric stacking optimization enhances laminated shell adaptive deformation capacity by 170% compared to conventional symmetric configurations, demonstrating significant performance improvements.</p>

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Design of asymmetrically stacked composite spherical shell with extension–shearing coupling effect

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Minghao Zhang,
  • Daokui Li,
  • Da Cui

摘要

Composite laminated shells are widely utilized in structural applications due to their superior mechanical properties. Among these configurations, asymmetric stacking sequence designs for extension–shearing coupled laminated spherical shells demonstrate distinct advantages in expanding fiber design space and enhancing structural mechanical performance. However, their practical implementation remains constrained by susceptibility to hygro-thermal-induced curing deformations. To elucidate the hygro-thermal stability mechanisms of asymmetric laminated shells, this study systematically derives stiffness equations and thermal force/moment components through rigorous consideration of geometric curvature effects. Subsequent formulation establishes an analytical stability criterion for hygro-thermal shearing stability in extension–shearing coupled laminated spherical shells by integrating geometric factors and material constants. Leveraging this stability condition as a constraint, an asymmetric stacking optimization model is developed with the extension–shearing coupling effect as the objective function. Through sequential quadratic programming optimization, stacking sequences maximizing adaptive deformation capacity while maintaining hygro-thermal stability are generated. Comprehensive numerical validation and robustness analyses confirm the theoretical framework’s validity and engineering applicability. Results indicate that asymmetric stacking optimization enhances laminated shell adaptive deformation capacity by 170% compared to conventional symmetric configurations, demonstrating significant performance improvements.