A precision tabletop for scientific instrumentation is described. The tabletop may be manufactured from as few as two pieces of material, include a honeycomb stiffening and vibration damping structure, be sealed from fluid ingress, include interior reinforcing structures, and permit accurate registration of machined features on all sides of the tabletop.

What is presented is a unit cell comprising a cellular geometry that comprises cell walls and cell edges arranged into a combination of a cubic cell geometry and a tetrahedral cell geometry arranged to have a coincident central vertex. The cubic cell geometry comprises three orthogonal cell faces that intersect at its central vertex. The tetrahedral cell geometry comprises an arrangement of eight tetrahedral cells that share its central vertex such that each tetrahedral cell shares three coincident edges with three other tetrahedral cells in a cubically symmetric arrangement. The tetrahedral cell geometry is combined with the cubic cell geometry such that all vertices of the tetrahedral cell geometry are coincident with the vertices of the cubic cell geometry.

A polymer spacer element for absorbing impact for an engine-powered vehicle includes an open front extremity and a rear extremity, and a honeycomb structure having channels made in a single piece and at least three channels each of which extends from the first open front extremity towards the second rear extremity. In addition, each channel of the channels is tapered from the first open front extremity towards the second rear extremity or vice-versa and presents an inner rake angle. In addition, each channel includes an elevation and a transversal section having a polygon shape that is regular or irregular, in which the transversal section has an equivalent lateral dimension equal to a diameter of a circumference having minimum diameter which circumscribes the transversal section of each corresponding channel. Each channel present a ratio between the elevation and the transversal dimension which is lower than or equal to three.

An impact force dampening and defusing structure includes a plurality of components arranged in a grid array. A component has a three-dimensional geometric shape that includes an impact receiving surface area and an impact defusing surface area. The impact defusing surface area is larger than, and a distance d from, the impact receiving surface area. The component includes a material composition and, when an impact force strikes the impact receiving surface area of the component and the impact force dampening and defusing structure is in position to protect a body part, the component contributes to reducing pressure on the body part based on the material composition, the distance d, the impact receiving surface area, and the impact defusing surface area.

Architected materials with superior energy absorption properties when loaded in compression. In several embodiments such materials are formed from micro-truss structures composed of interpenetrating tubes in a volume between a first surface and a second surface. The stress-strain response of these structures, for compressive loads applied to the two surfaces, is tailored by arranging for some but not all of the tubes to extend to both surfaces, adjusting the number of layers of repeated unit cells in the structure, arranging for the nodes to be offset from alignment along lines normal to the surfaces, or including multiple interlocking micro-truss structures.

A force defusing structure includes first and second plurality of spherical shaped objects. A first spherical shaped object is proximally positioned to two or more second spherical shaped objects. When a force is applied to the first spherical shaped object, the first spherical shaped object collides with the two or more second spherical shaped objects to defuse the force based on a multi-dimensional collision between the first spherical shaped object and the two or more second spherical shaped objects.

A cellular structure may include a plurality of cells each having a twelve-cornered cross section. The twelve-cornered cross section may include twelve sides and twelve corners creating eight internal angles and four external angles. Each cell may include a plurality of longitudinal walls extending between a top and a bottom of the cell, the longitudinal walls intersecting to create corners of the cell. A structural component may include at least one wall surrounding a component interior space with a cellular structure having at least two cells being positioned within the interior space. A sandwich structure may include first and second substantially planar structures, and a cellular structure with at least two cells positioned between the first and second substantially planar structures.

What is presented is a unit cell that has a cellular geometry that comprises cell walls and cell edges arranged into a combination of a cubic cell geometry and a tetrahedral cell geometry and assembled structures that comprise a plurality of unit cells. The voids of the unit cell created by the combination of geometries comprise regular tetrahedrons, irregular tetrahedrons, and octahedrons. In some embodiments, the thickness of selected cell walls can vary and in some embodiments have zero thickness. In some embodiments selected cell walls and selected cell edges have a varied thickness. In other embodiments selected cell walls are non-planar. In some embodiments selected cell walls may have one or more holes. Selected cell edges of some embodiments of unit cell may have varying cross-sectional geometry that vary along a length of the cell edge. Some embodiments of the unit cell may comprise fillets to blunt stress concentrations.

An impact absorbing element comprising a tubular body for absorbing the impact energy in a vehicle is proposed, the impact absorbing element having a double honeycomb-shaped cross section and being configured as a 10-face polygonal line, and honeycomb points being configured which are situated at a spacing (b2) from one another of approximately half the overall height (b1) of the impact absorbing element and define a width.

Disclosed herein is an energy absorber having excellent impact resistance and excellent impact energy absorbability. The energy absorber includes an olefin-based resin composition obtained by mixing an olefin resin, a polyamide resin, and an elastomer having a reactive group that reacts with the polyamide resin, wherein the olefin-based resin composition has a continuous phase containing the olefin resin and a polyamide resin-based dispersed phase dispersed in the continuous phase, and the polyamide resin-based dispersed phase has a structure in which the elastomer is contained in a matrix phase containing the polyamide resin.