scholarly journals Towards Self-shaping Metamaterial Shells:

2021 ◽  
pp. 275-285
Author(s):  
E. Özdemir ◽  
L. Kiesewetter ◽  
K. Antorveza ◽  
T. Cheng ◽  
S. Leder ◽  
...  
Keyword(s):  
Efficient Solution ◽  
Computational Design ◽  
Element Model ◽  
Shell Structures ◽  
Form Generation ◽  
Shape Prediction ◽  
Robotic Fabrication ◽  
Double Curvature ◽  
Physical Form ◽  
3D Printed

AbstractDouble curvature enables elegant and material-efficient shell structures, but their construction typically relies on heavy machining, manual labor, and the additional use of material wasted as one-off formwork. Using a material’s intrinsic properties for self-shaping is an energy and resource-efficient solution to this problem. This research presents a fabrication approach for self-shaping double-curved shell structures combining the hygroscopic shape-changing and scalability of wood actuators with the tunability of 3D-printed metamaterial patterning. Using hybrid robotic fabrication, components are additively manufactured flat and self-shape to a pre-programmed configuration through drying. A computational design workflow including a lattice and shell-based finite element model was developed for the design of the metamaterial pattern, actuator layout, and shape prediction. The workflow was tested through physical prototypes at centimeter and meter scales. The results show an architectural scale proof of concept for self-shaping double-curved shell structures as a resource-efficient physical form generation method.

scholarly journals Adaptive Strategies for Mud Shell Robotic Fabrication

2018 ◽  
Vol 3 (2) ◽  
pp. 64
Author(s):  
Chaltiel Stephanie ◽  
Bravo Maite ◽  
Ibrahim Abdullah
Keyword(s):  
Spray Deposition ◽  
Sustainable Use ◽  
Adaptive Strategies ◽  
Computational Design ◽  
Digital Fabrication ◽  
Construction Methods ◽  
Robotic Fabrication ◽  
Material Deposition ◽  
Physical Tests ◽  
Full Scale Tests

The digital fabrication of monolithic shell structures is presenting some challenges related to the interface between computational design, materialist, and fabrication techniques. This research proposes a singular method for the sequential robotic spray deposition in layers of diverse clay mixes over a temporary fabric form-work pulled in between peripheral and cross section arches. This process relies mainly on the continuity of the construction phases for stability and durability but has encountered some challenges in physical tests related to sagging, displacement, and deformations during the robotic deposition of the material. Adaptive strategies during the digital fabrication stages are proposed for a sequential exploration of the geometry, structural analysis, and construction techniques. Alternative adjustments of protocols for the robotic material deposition include both predictable and unsuspected behaviors preventing the structure to reach non-viable geometric thresholds. Two case studies of physical tests describe, analyze, and simulate some of these strategies and identify specific parameters inquiring the sequential adjustments of the robotic material deposition. These strategies will drive future full-scale tests within a sustainable use of materials and adaptive construction methods, seeking an optimized structural performance that could open a new chapter for the digital fabrication of earthen shells.

scholarly journals Bone-inspired 3D printed structures for construction applications

2019 ◽  
Vol 14 (1) ◽  
pp. 111-124
Author(s):  
Roberto Naboni ◽  
Anja Kunic
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Computational Design ◽  
Bone Microstructure ◽  
Manufacturing Technology ◽  
Support Design ◽  
Efficient Construction ◽  
3D Printed ◽  
Viable Approach ◽  
Tectonic System

Overconsumption of resources is one of the greatest challenges of our century. The amount of material that is being extracted, harvested and consumed in the last decades is increasing tremendously. Building with new manufacturing technology, such as 3D Printing, is offering new perspectives in the way material is utilized sustainably within a construction. This paper describes a study on how to use Additive Manufacturing to support design logics inspired by the bone microstructure, in order to build materially efficient architecture. A process which entangles computational design methods, testing of 3D printed specimens, developments of prototypes is described. A cellular-based tectonic system with the capacity to vary and adapt to different loading conditions is presented as a viable approach to a material-efficient construction with Additive Manufacturing.

scholarly journals Computational design, engineering and manufacturing of a material-efficient 3D printed lattice structure

2020 ◽  
Vol 18 (4) ◽  
pp. 404-423
Author(s):  
Roberto Naboni ◽  
Anja Kunic ◽  
Luca Breseghello
Keyword(s):  
Lattice Structure ◽  
Computational Design ◽  
Material Structure ◽  
Fused Deposition Modelling ◽  
Design Engineering ◽  
Design Development ◽  
Fused Deposition ◽  
Construction Methods ◽  
3D Printed ◽  
Scarcity Of Resources

Building with additive manufacturing is an increasingly relevant research topic in the field of Construction 4.0, where designers are seeking higher levels of automation, complexity and precision compared to conventional construction methods. As an answer to the increasing problem of scarcity of resources, the presented research exploits the potential of Fused Deposition Modelling in the production of a lightweight load-responsive cellular lattice structure at the architectural scale. The article offers an extensive insight into the computational processes involved in the design, engineering, analysis, optimization and fabrication of a material-efficient, fully 3D printed, lattice structure. Material, structure and manufacturing features are integrated within the design development in a comprehensive computational workflow. The article presents methods and results while discussing the project as a material-efficient approach to complex structures.

Formalizing abstract characteristics of style

2006 ◽  
Vol 20 (3) ◽  
pp. 267-285 ◽  
Author(s):  
KIMBERLE KOILE
Keyword(s):  
Computational Design ◽  
Physical Characteristics ◽  
Design Support ◽  
Support Tool ◽  
Physical Form ◽  
Design Support Tool

This paper claims that style, in addition to being identified by common visible physical characteristics of form, can be thought of in terms of a set of common abstract characteristics. A prototype computational design support tool is described that explores this idea in the domain of architecture. The Architect's Collaborator (TAC) supports articulation and evaluation of abstract characteristics of style (e.g., experiential characteristics such as privacy and shelter) and does so by mapping abstract characteristics to details of physical form. The implementation of TAC is described and successful experiments are reported in which abstract characteristics of Frank Lloyd Wright's Prairie houses were mapped to physical form characteristics and used to evaluate Prairie and non-Prairie houses.

scholarly journals Implementation of a Non-Orthogonal Constitutive Model for the Finite Element Simulation of Textile Composite Draping

2014 ◽  
Vol 553 ◽  
pp. 76-81 ◽  
Author(s):  
Robert S. Pierce ◽  
Brian G. Falzon ◽  
Mark C. Thompson ◽  
Romain Boman
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Low Cost ◽  
Element Model ◽  
Textile Composites ◽  
Shear Behaviour ◽  
Textile Composite ◽  
Double Curvature ◽  
Linear Shear ◽  
Out Of Autoclave

In the pursuit of producing high quality, low-cost composite aircraft structures, out-of-autoclave manufacturing processes for textile reinforcements are being simulated with increasing accuracy. This paper focuses on the continuum-based, finite element modelling of textile composites as they deform during the draping process. A non-orthogonal constitutive model tracks yarn orientations within a material subroutine developed for Abaqus/Explicit, resulting in the realistic determination of fabric shearing and material draw-in. Supplementary material characterisation was experimentally performed in order to define the tensile and non-linear shear behaviour accurately. The validity of the finite element model has been studied through comparison with similar research in the field and the experimental lay-up of carbon fibre textile reinforcement over a tool with double curvature geometry, showing good agreement.

Dynamical Analysis of Shell Structures by Means of B-Spline Shape Functions

2007 ◽  
Author(s):  
Antonio Carminelli ◽  
Giuseppe Catania
Keyword(s):  
Numerical Solutions ◽  
Ritz Method ◽  
Computational Cost ◽  
Free Vibration Analysis ◽  
Shell Structures ◽  
Dynamical Analysis ◽  
Free Form ◽  
Shape Functions ◽  
B Spline ◽  
Double Curvature

This paper presents a free vibration analysis of double curvature free form shaped shell structures using the B-spline shape functions approximation method. It is based on the Ritz method. The shell formulation is developed following the well known Ahmad degenerate approach including the effect of shear deformation. The assumed displacement field is described through non-uniform B-spline functions of any degree. The effect of locking is investigated and both reduced and modified quadrature integration rules are considered with the purpose of increasing the solution accuracy and diminishing the computational cost. Numerical simulation is reported for the evaluation of the eigensolution of plates, and of single and double curvature shells to test the effectiveness and the efficiency of the approach. The presence of spurious zero energy modes both at local and global level was investigated. The solutions are compared with other available analytical and numerical solutions, and discussed in detail.

Block finite-element model of layer-by-layer analysis of three-layer stress–strain state in general irregular shells of rotation of double curvature

2019 ◽  
Vol 484 (1) ◽  
pp. 35-40
Author(s):  
V. N. Bakulin
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Element Model ◽  
Core Material ◽  
Layer By Layer ◽  
Shells Of Revolution ◽  
Stress Strain ◽  
Stress Strain State ◽  
Double Curvature ◽  
Layer Analysis

This study proposes a finite-element block approach to building a new, refined model for layer-by-layer analysis of the stress–strain state of generally irregular sandwich shells of revolution with double curvature. A core material model is developed for the first time for such shells, based on more precise statements compared to those of similar common models; it allows the avoidance of the discontinuity of generalized displacements on the surfaces of an interface with base layers and switching to simpler models depending on the problem statement. Using the proposed model, it is possible to create an allowance for the changes in the properties and parameters of the stress–strain state in all the three coordinates, to which the shell is assigned, and to obtain a solution within the specified statement for different shell shapes and boundary conditions of layers, including in the case of discontinuity.

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