Cross-Shaped Space Frame Nodes Using Shape Memory Materials
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Solution Overview
Problem
Current space frame technologies lack flexibility, making structures susceptible to fractures under environmental stresses due to the use of rigid metallic components, which are costly and difficult to distribute, and do not allow for even force distribution across the structure.
Innovation Solution
A modular space frame system using cross-shaped members made from shape memory alloys, polymers, or copolymers, with integrated connector pieces that interlock via snap-fit mechanisms, allowing for varying levels of flexibility and rigidity by distributing forces across the structure, and enabling construction without permanent fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid metallic components are used in space frames, then structural strength is improved, but flexibility and resistance to environmental stresses deteriorate
Solution Approach 1:
The patent changes the material parameter from rigid metal to flexible materials (plastic, polymer, composite) that can deform under stress. This allows the structure to absorb environmental forces through elastic deformation rather than fracturing, resolving the contradiction between maintaining strength and resisting environmental stresses.
Solution Approach 2:
The patent employs composite materials combining flexible polymers with reinforcing elements (fibers, ribs, or metal inserts) to achieve both flexibility and strength. The composite structure distributes stress across multiple material phases, allowing the frame to bend without breaking while maintaining adequate load-bearing capacity.
2Stability of the object's composition
If specially designed metallic struts are used, then structural rigidity is improved, but manufacturing cost and distribution difficulty increase
Solution Approach 1:
The patent adopts inexpensive plastic or polymer components that can be mass-produced through injection molding or extrusion. These components are designed to be replaceable and easy to manufacture in large quantities, eliminating the need for expensive precision-machined metal struts and complex assembly procedures.
Solution Approach 2:
The patent changes the manufacturing approach from precision metal fabrication to high-volume polymer molding. This allows for standardized, interchangeable components that can be produced cheaply and distributed easily, while structural rigidity is maintained through clever geometric design (ribs, truss patterns, cross-section shapes) rather than material cost alone.
3Strength
If rigid components are used throughout the structure, then structural strength is improved, but adaptability to different stress directions deteriorates
Solution Approach 1:
The patent introduces dynamic flexibility into the structure through hinge joints and articulated connections between components. These joints allow the frame to change its configuration in response to external forces, redistributing stresses dynamically across different members. The structure can remain rigid in one direction while being flexible in another, adapting to various loading conditions.
Solution Approach 2:
The patent applies different mechanical properties to different parts of the structure. Certain members are designed with high rigidity to bear primary loads, while joints and connectors incorporate flexibility to accommodate movement. This local differentiation allows the overall structure to maintain strength while adapting to stresses from multiple directions through selective rigidity and flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a lightweight, strong, and flexible structure that can absorb and distribute forces evenly, reducing the risk of fractures and allowing for easy assembly and reconfiguration, while maintaining structural integrity and reducing manufacturing and logistical costs.
Implementation Method 1
each such connector piece comprising a distal connecting pin with a ledge and an angled edge for locking... the cross-shaped member is constructed of a durable yet flexible material from the group comprising shape memory metal alloys, shape memory polymers or shape memory copolymers
Data Source
AI summary
A system of cross-shaped units and nodes used to construct strong, lightweight, inexpensive space frames with alternately rigid and flexible components, in which each cross-shaped unit which fits together with five like units to form a spherical node which can be connected to other nodes to form frames for the production of structures including toys, playground structures, lattices, pergolas, statues, roofs, furniture, fixtures, mattresses, kites, lamps, artistic structures and fixtures, floating platforms, flexible joints for machines or robots, buildings, bridges and space stations.