Yves Klett

Multiscale modeling methods for analysis of failure modes in foldcore sandwich panels

The paper presents an homogenised core model suitable for use in the analysis of fuselage sandwich panels with folded composite cores under combined loading conditions. Within a multiscale numerical design process a failure criterion was derived for describing the macroscopic behaviour of folded cores under combined loading using a detailed foldcore micromodel. The multiscale modelling method was validated by simulation of combined compression/bending failure of foldcore sandwich panels.

Kinematic Analysis of Congruent Multilayer Tessellations

Rigidly foldable origami tessellations exhibit interesting kinematic properties. Several tessellation types (most prominently Miura-ori) have shown potential for technical application in aerospace and general lightweight construction. In addition to static (e.g. as core structures for sandwich components) and single-layer kinematic (e.g. deployable) applications, new possibilities arise from the combination of several layers of tessellations with congruent kinematics. This paper presents an analytical description of the kinematics of multi-layered, or stacked, globally plane tessellations which retain rigid foldability by congruent, compatible movement.Copyright

Realtime Rigid Folding Algorithm for Quadrilateral-Based 1-DOF Tessellations

Origami tessellations consisting of repetitively tiled unit cell elements can be used to manufacture cellular three-dimensional structures with interesting mechanical and other properties. In recent years, the search for alternative and innovative core materials for sandwich constructions has resulted in renewed interest in such foldable structures. The ability to simulate the folding process of such structures with one kinematic degree of freedom is essential for their successful design and manufacture. We present an algorithm that allows for the implicit calculation of arbitrary rigid folding states of quadrilateral-based structures with certain topological features. This enables reliable real-time virtual folding of a large number of important tessellation types which has been put to good use in numerous projects.Copyright

Potential of origami-based shell elements as next-generation envelope components

Building envelopes manage several crucial functions, including structural, thermal, hygric and aesthetic functions. Classic façade concepts usually work with static elements like glass, metal or composite panels that primarily provide protection against the elements, and an additional layer of active systems that manage dynamic tasks like light protection or thermal regulation. Kinematic shell elements offer new ways to incorporate multiple dynamic functionalities into cladding elements, and thus can help to generate new active, efficient and aesthetic envelopes. We will introduce the concept of origami-inspired multifunctional shell elements and discuss potential applications.