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Morphing systems able to efficiently adjust their characteristics to resolve the conflicting demands of changing operating conditions offer great potential for enhanced performance and functionality. The main practical challenge consists in combining the desired compliance to accomplish radical reversible geometry modifications at reduced actuation effort with high stiffness necessary for operational reasons. The present thesis addresses these contradictory requirements through a novel approach combining the proven conformal shape adaptation benefits of distributed compliance with purely elastic stiffness variability provided by monolithically embedded bi-stable laminates. Switching between the stable states of the internal elements allows the global stiffness to be modified on demand at reduced actuation effort, activating deformation modes not attainable with uniform distributed topologies. First, a numerical design methodology is developed for thermally-induced bi-stable laminates to fulfil the envisaged function of variable stiffness components integrated in a larger substructure. Bi-stability assessment relies on two independent criteria: a controlled displacement cool-down test, and the characteristic strain energy profile featuring minima corresponding to the equilibrium shapes. Tailoring the spatial stacking sequence distribution permits controlling the resulting stiffness characteristics, while satisfying the embeddability objective of clamping two opposite edges without bi-stability loss. Second, the feasibility of the proposed strategy is proved numerically and experimentally by means of a NACA 0012 aerofoil with two bi-stable elements as part of a straightforward topology. A simple mechanical test demonstrates

Selective Morphing through Distributed Compliance with Variable Stiffness Based on Embedded Bi-Stable Structures