Wrinkling of thin plates and shells on shrinking substratesVeldin, Tomo (Avtor) Trojer, Jonas (Avtor) Brank, Boštjan (Avtor) Brojan, Miha (Avtor) wrinklingthin shellfinite element3D solidneo-Hookean materialA new finite element formulation and a set of novel desktop experiments for studying wrinkling of thin plates and shells on shrinking substrates is presented. In developing the computational model, we build on our previous work and further develop the finite element formulation by implementing a neo-Hookean material model to more accurately capture large displacements and large strains in the substrate. The substrate is discretized with solid 3D hexahedral 8 node finite elements, whose formulation was derived using the theory of incompatible modes. Our computational model is validated through a series of numerical and desktop experiments on plates and shells. Numerically, the strain mismatch is simulated by cooling the substrate, while experimentally it is achieved through the shrinkage of the silicone substrate during solidification, which was enhanced by the addition of a silicone oil. The extent of shrinkage was controlled by the volume ratio of silicone elastomer-to-silicone oil. A good agreement between the calculated wavelengths of the neighboring wrinkles from numerical simulations, experiments and theoretical predictions confirmed the predictive effectiveness of the proposed numerical procedure.20252026-05-15 12:56:59Članek v reviji182542sl