Sandwich panels with functionally graded strut‐based lattice cores

Abstract

AbstractDue to their high mechanical performance, sandwich panels are widely utilized in many applications. Among the most frequently used cores in sandwich panels are honeycomb structures. Since the invention of additive manufacturing, new core structures like strut‐based lattices which are not possible by conventional manufacturing processes are also being considered as cores for sandwich panels. Depending on the given boundary conditions and load cases, core struts must transfer different loads. Particularly struts near load introduction points and support points are exposed to high local stresses. In the present study, a graded core is used to reduce the effect of local stress concentration near load introduction points and support points. In the graded core higher loaded areas show a higher relative density. In contrast, low loaded areas represent lower relative density, resulting in a reduction of the core weight and a uniform stress distribution. Only the strut diameters are varied. It is demonstrated that systematic optimization allows a well‐tailored core gradation and some valuable weight reduction.