netfabb’s Selective Space Structures (3S) has been incredibility useful to us ....
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Strength and weight optimized structures can feature low density combined with very strong mechanical properties.
Depending upon the application, the Selective Space Structures concept can be used to place structures on the part exactly where it is needed to provide maximum strength. Weight savings of up to 70% can be achieved, saving energy without reducing durability, stability or strength.
Some sample applications are:
- Lightweight components. Achieve Lightweight Designs without reducing mechanical strength by using the Selective Space Structures concept.
- Directed load path. Forces applied to the part can be diverted by structures. This opens the possibility to make use of innovative or integral designs.
- Load absorbing structures. The Safety Crash Absorber, able to decisively reroute forces to structures with high energy absorbtion.
- Metal foam with designed properties for high temperature applications.
- Joints and inserts for Composites Applications for composite parts in carbon fiber.
Metal foams are a new class of material, as yet imperfectly characterized, but with alluring properties. They are light and stiff, they have good energy-absorbing characteristics and they have attractive heat-transfer properties.
3S enables tailored properties of metal foam-like structures with working temperatures of up to 500 C and above, depending on the Additive Fabrication technology used for production. The Elastic Modulus can be tailored according to the requirements of the application. Progressive and/or gradient properties can easily be achieved.
With Additive Manufacturing, Metal foam components can be manufactured in a net-shape and can be integrated with solid areas. They can be designed with open cells like polymer foams or with closed cells like metallic cork. Despite the foam-like appearance they will have the typical characteristics of metals regarding ductility, electrical conductivity, weld ability, etc.
Typically, the elastic modulus of a foam can be described as E= E0(dens/dens0)n where the exponent n is in between 1.8 and 2.2. With the engineering of the cellular structure, it is possible to tailor the exponent n in a wider range of 1.7 to a very high number which will provide a very flexible yet temperature resistant "foam".Surface Structures for Enhanced Surface Bonding
With 3S you can design a tailored surface architecture to enhance bonding between metal and composite. The technology provides a high level of freedom in surface topology. Joints can be designed with progressive stiffness to comply better with the properties of the composite material.