Key Engineering Materials Vol. 913

Abstract: The aim of this study is to identify simultaneously the thermal conductivity tensor and the volume heat coefficient of a bimaterial (checkerboard) whose heat conduction obeys Fourier's law. This approach is validated by numerical simulation. The simulated temperature fields are obtained by the direct resolution heat conduction solved numerically by the finite element method formulation. To identify parameters, an inverse method is developed by using the finite element temperature approach (FEU-T) model fitting method based on the Levemberg-Marquardt algorithm. We validated the numerical procedure by using noiseless temperature fields at different time and space steps. The influence of the noise on the temperature fields is also studied and shows the efficiency of the inverse method. The results show that this procedure is not very sensitive to the number of elements (or space steps) and the number of time steps.

Abstract: The fabrication of co-cured metal/CFRP joints offers some relevant advantages as the elimination of adhesives and the simplification of building process. In this view, the additive manufacturing (AM) of metal parts is suitable for expanding the potentialities of co-cured AM metal/CFRP joints where patterned surfaces are introduced. This paper presents a methodology to fabricate the joint, based on matrix patterns of 3D features on the metal surface, which is able to improve the polymer matrix adhesion and to provide carbon fibers engagement. Both FEM simulations and experiments show significant enhancement of the global mechanical strength.

Abstract: Metamaterials are controlled arrangements of material structures in which their mechanical properties can be tailored by tuning their geometrical parameters. A parametrization based on cubic Bézier curves is employed here to generate cantilever lattice-beams by changing the position of a free control point. The apparent stiffness of these lattice-beams is numerically analyzed by means of tensile, bending, and free vibration simulations. Results expose the influence of shear deformation in the mechanical behavior of beams made from a cellular material; different degrees of variation depending on the loading conditions and lattice topology are observed and discussed.