The main results and their exploitation are the following:
• Development of an adaptable refinement approach based on node-dependent Kinematics (NDK) and hierarchical elements are accounting for fully coupled electromechanical effects.
• Introduction of the Hierarchical Legendre Expansion (HLE) to handle complex architectures, e.g. 3D woven composites and metamaterials., at the macro-, meso-, and microscale via 1D models.
• Analysis of stress concentrations at the free edges of laminated structures and lap joints via 1D refined models and simulation of Lamb waves for structural health monitoring purposes.
• Development of a nonlinear, concurrent multiscale scheme based on 1D models and providing 3D-like accuracy with four times less computational time than 3D solid models.
• Implementation of a contact formulation for higher-order one-dimensional elements to simulate the impact and cohesive elements for interlaminar damage and failure.
• Development of interfaces for the in-house codes with commercial codes such as ABAQUS for pre- and post-processing operations and integration of micromechanics capabilities with the NASA NASMAT code.
• Development of a global-local approach that includes skin-stringer debonding.
• Implementation of a special homogenization procedure that preserves dissipated energy between the local and the global level.
• Analysis of the non-linear response of structures with varying material properties to develop a mapping of the sensitivity of these structures to variations to improve the structural performance.
• Multi-scale structural modeling by bridging micromechanics and the advanced CUF one-dimensional/beam structural theories using the Multilevel Finite Element (also known as FE2) framework
• Investigation of the effect of microscale imperfections (not straight carbon fibers) on the macroscale response (instability).
• Implementation of Green-Lagrange geometric non-linearities within a 1D framework of a total Lagrangian approach, including shear and membrane locking correction strategy via the Mixed Interpolation of Tensorial Components (MITC).
• Analysis of pre-buckled bistable composite beam structures for different slenderness ratios, material properties, and boundary conditions.
• Extension of the existing Carrera Unified Formulation framework to perform non-linear and large displacement analyses of non-prismatic, 3D-like, beam structures
• Development of a methodology to analyze the effect of localized low stiffness regions in the buckling and post-buckling behavior of thin structures
• Development of a new, non-iterative and intuitive methodology for designing topologically efficient buckling resistant structures
• Characterization of the full viscoelastic set of the composite material properties and identification of the uncertainty of the material properties, at each pertinent scale.
• Implementation of a hyperelastic constitutive law in a commercial Finite Element code and validation for the case of a yarn subjected to transverse impact
• Analysis of the effect of stochastic yarn distortion over the margin of its cross-section and stochastic yarn waviness over the yarn’s length, to the stiffness and strength of the macroscale textile layer properties.
• Uncertainty quantification of the strength properties of braided composites
• Integration of probabilistic methods within the framework of an inverse optimization-based approach for the characterization of material properties in lower scales.
The dissemination comprehended
• Four FULLCOMP special sessions in international conferences.
• One book with the FULLCOMP proceedings of the special session at the AIDAA 2015 conference.
• One book for Springer on the main results of the project with chapters authored by each ESR
• 65 journal papers.
• 83 conference presentations.
