Project

Bending-active structures

Updates
0 new
0
Recommendations
0 new
0
Followers
0 new
11
Reads
0 new
178

Project log

Riccardo La Magna
added 3 research items
Cellular structures derive their macro mechanical properties from the specific arrangement of material and voids, therefore geometry is the main responsible for the peculiar mechanical behaviour of these classes of metamaterials. By varying the geometry and topology of the pattern, the mechanical response changes accordingly, allowing to achieve a wide range of properties which can be specifically tailored and adapted to the needs of the designer. In this paper, the bending behaviour of certain classes of cellular structures will be discussed, with the specific aim of achieving non-standard deformations. The main objective of the research focuses on the ability of inducing double-curvature in flat produced patterns as a by-product of elastic bending.
Emerging directly from a masterclass held by the authors at IASS 2017, this paper presents a quantitative and qualitative benchmark comparison between three distinct software environments, namely SOFiSTiK, Kangaroo and Kiwi3d, framed specifically within the context of designing and simulating bending-active structures. The three environments differ significantly not only in their numerical methods and implementation but also in their stages of software development, licensing structure and design intent and so their comparison represents a timely and valuable insight into the status quo for the design of bending-active hybrid structures.
The goal of this paper is to advance the research on bending-active structures by investigating the system's inherent structural characteristics and introducing an alternative approach to their design and fabrication. With this project, the authors propose the use of sandwich-structured composites to improve the load-bearing behavior of bending-active shells. By combining digital form-finding and form-conversion processes, it becomes possible to discretize a double-curved shell geometry into an assembly of single-curved sandwich strips. Due to the clever use of bending in the construction process, these strips can be made out of inexpensive and flat sheet materials. The assembly itself takes advantage of two fundamentally different structural states. When handled individually, the thin panels are characterized by their high flexibility, yet when cross-connected to a sandwich, they gain bending stiffness and increase the structure's rigidity. To explain the possible impacts of this approach, the paper will discuss the advantages and disadvantages of bending-active structures in general and outline the potential of sandwich shells in particular. Furthermore, the authors will address the fundamental question of how to build a load-bearing system from flexible parts by using the practical example of the Studio One Research Pavilion. To illustrate this project in more detail, the authors will present the digital design process involved as well as demonstrate the technical feasibility of this approach through a built prototype in full scale. Finally, the authors will conclude with a critical discussion of the design approach proposed here and point out interesting topics for future research.
Riccardo La Magna
added a research item
This paper discusses the design, simulation and construction of a bending-active textile hybrid structure commissioned to the authors as part of the 2018 Venice Biennale. The hybrid structure combines the flexibility and elastic properties of GFRP rods together with bespoke CNC knitted fabric, creating a subtle equilibrium of forces along the unfolding of the installation. Building on the knowledge developed by the authors on previous bending-active hybrid prototypes, the structure represents the latest effort in terms of integration of design analysis tools within a holistic and comprehensive workflow. This enables designers to step fluently from initial concept development and definition of overall shape to the final specification of the knitted membrane structure on loop level for digital fabrication. With particular emphasis on the simulation tools employed, the paper will focus on the most up-to-date computational technologies and numerical approaches that are currently being developed for the design and analysis of bending-active and textile hybrid structures. Specifically, three distinct environments were used to form-find and analyse the structural behaviour of the installation, these environments being Kangaroo (vector-based approach), Kiwi3d (Isogeometric Analysis) and SOFiSTiK (Finite Element Analysis). This all-encompassing approach provided the perfect platform to cross-benchmark the three different methods, highlighting the qualities of each one and providing valuable information on the most appropriate software within a certain stage of design.
Riccardo La Magna
added 2 research items
Commonly referred to as bending-active, the term has come to describe a wide variety of systems that employ the large deformation of their constituent components as a primary shape-forming strategy. It is generally impossible to separate the structure from its geometry, and this is even more true for bending-active systems. Placed at the intersection between geometry, design and engineering, the principle objective of this thesis is to develop an understanding of the structural and architectural potential of bending-active systems beyond the established typologies which have been investigated so far. The main focus is set on systems that make use of surface-like elements as principle building blocks, as opposed to previous and existing projects that predominantly employed linear components such as rods and laths. This property places the analysed test cases and developed prototypes within a specific category of bending-active systems known as bending-active plate structures.
Riccardo La Magna
added 8 research items
This paper focuses on various analogue and numerical design strategies that were developed and implemented to generate pre-defined, free-form surfaces with parametrically differentiated bending-active components. Derived from recent research on bending-active plate structures, the authors present two case studies which both focus on the seamless interaction of material, form, and structure. Both systems illustrate a novel approach to the realisation of double curved, free-form structures by means of bending. The two systems were built in prototypical mock-ups to evaluate their geometry and structural capacity. While the resulting geometries are complex, the use of elastic bending during the assembly process allows for simple manufacturing methods. Thin plastic sheets, which are easy to cut and bend, were manipulated by simple, two-dimensional fabrication techniques and assembled into multi-layered, bent structures that are stiff and self-supporting. After a general introduction on bending-active plate structures, the authors present the key design principles used for the development of the two case studies and conclude with a reflection and comparison of these techniques.
This work presented investigates the form-finding and design potentials of bending-active plate structures. Using two reference projects from the recent past, the authors present different design methodologies that either follow a geometry-based or integrated approach. A closer look at the newly accessible tools for digital form-finding and analysis reveals their increasing importance for the design process. In order to better demonstrate their potential, the authors present three case studies, which each separately enhances the integrated approach and in combination indicate the existence of a much larger design space of bending-active plate structures.