Definition of Shell-Like Reduced Order Models for Studying Laminated Composite Structures with Discontinuities

  • Turon, Francesc (CIMNE)
  • Otero, Fermin (CIMNE)
  • Ferrer, Alex (CIMNE)
  • Martinez, Xavier (CIMNE)

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This work develops a practical method to reduce the computational cost associated with the numerical analysis of large, laminated composite structures with irregularities such as holes, thickness variations and transitions. A weak coupling between Reissner-Mindlin (RM) shell models and solid models is proposed to combine the strengths of both approaches. Shell elements efficiently model regular laminate regions, while Solid elements provide detailed stress distributions in irregular or discontinuous regions. The resulting hybrid model provides a global approximation of structural stiffness while optimizing computational resources. The coupling also makes it possible to define Shell-Like Reduced Order Models (SLROMs) Super-elements that bridge the complex kinematics of Solid models with RM Shell elements. SLROMs can be assembled with conventional shell models and allow efficient modelling of composite structures with detailed stress analysis in critical regions through post-processing evaluation. The methodology is based on the Mixing Dimensional Coupling (MDC) method, extended to include layered laminates. Numerical validations confirm the accuracy and efficiency of the proposed coupling, and the SLROM definition, even for complex laminate behavior with significant discontinuities, making it particularly useful for large-scale structural analysis in composite industry.