A metal sheet having a low friction coefficient and a low waviness. Multiple round or roughly-round small pits are distributed on the surface of the metal sheet. The diameter of a single pit ranges from 30 μm to 150 μm, and the overlap between adjacent pits is lower than 10%. On the surface of the metal sheet where the pits are located, the proportion of the area of pits per square millimeter of surface area is greater than 30%, and the difference between the quantities of pits in any unit square millimeter is less than 20%. By means of the proper design of surface microstructure, the friction coefficient and the waviness can be effectively reduced, thereby improving the forming and painting performance of the material.

A metal sheet having a low friction coefficient and a low waviness. Multiple round or roughly-round small pits are distributed on the surface of the metal sheet. The diameter of a single pit ranges from 30 μm to 150 μm, and the overlap between adjacent pits is lower than 10%. On the surface of the metal sheet where the pits are located, the proportion of the area of pits per square millimeter of surface area is greater than 30%, and the difference between the quantities of pits in any unit square millimeter is less than 20%. By means of the proper design of surface microstructure, the friction coefficient and the waviness can be effectively reduced, thereby improving the forming and painting performance of the material.

A multistable compliant mechanism is formed by connecting sequentially multiple basic units front to end to form a closed annular structure. Each basic unit includes two flexible hinges perpendicular to each other on different planes and two rigid connection parts for connecting the flexible hinges. The two flexible hinges are connected by a rigid connection part, and one of the flexible hinges is connected to a flexible hinge of an adjacent basic unit through the other rigid connection part. Lengths of two rigid connection parts in a same basic unit are equal, but lengths of rigid connection parts of different basic units are not necessarily equal. The multistable compliant mechanism features the continuous rotation and multi-steady state of a tri-compliant mechanism. The multistable compliant mechanism also features variable mechanism topology, an adjustable unit number, easy implementation, and promotion. A method for steady state analysis of the multistable compliant mechanism is also provided.

A multistable compliant mechanism is formed by connecting sequentially multiple basic units front to end to form a closed annular structure. Each basic unit includes two flexible hinges perpendicular to each other on different planes and two rigid connection parts for connecting the flexible hinges. The two flexible hinges are connected by a rigid connection part, and one of the flexible hinges is connected to a flexible hinge of an adjacent basic unit through the other rigid connection part. Lengths of two rigid connection parts in a same basic unit are equal, but lengths of rigid connection parts of different basic units are not necessarily equal. The multistable compliant mechanism features the continuous rotation and multi-steady state of a tri-compliant mechanism. The multistable compliant mechanism also features variable mechanism topology, an adjustable unit number, easy implementation, and promotion. A method for steady state analysis of the multistable compliant mechanism is also provided.

A metal substrate provided with surface textures wherein different texture patterns are provided over predefined surface areas of the metal substrate and wherein the different texture patterns are tailored to predefined surface properties of a product which is to be made out of the metal substrate as well as to a method for applying such surface textures on the metal substrate.

A metal substrate provided with surface textures wherein different texture patterns are provided over predefined surface areas of the metal substrate and wherein the different texture patterns are tailored to predefined surface properties of a product which is to be made out of the metal substrate as well as to a method for applying such surface textures on the metal substrate.

The present invention relates to a wearable protection device (1) comprising a modular frame (3) with at least two shaped members (4A, 4B, 4C) and hinge means (9) for hinging the shaped members (4A, 4B, 4C) therebetween at corresponding hinging points (5) and around respective rotation axes (X). Each of said hinge means (9) comprises a pivot element (12) and a disc element (13) which are permanently coupled by riveting of the pivot element (12). After the riveting the pivot element (12) is flush with the disc element (13). The present invention also relates to a method of assembling said wearable protection device (1) and to a motorcycle boot (B) comprising said wearable protection device (1).

A structural panel is provided that includes a first core structure and a second core structure. The first core structure is configured with a first endwall and a plurality of first cavities that extend vertically through the first core structure. The second core structure is configured with a second endwall and a plurality of second cavities that extend vertically through the second core structure. The second core structure is laterally bonded to the first core structure at a complex splice joint between the first endwall and the second endwall.

A structural panel is provided that includes a first core structure and a second core structure. The first core structure is configured with a first endwall and a plurality of first cavities that extend vertically through the first core structure. The second core structure is configured with a second endwall and a plurality of second cavities that extend vertically through the second core structure. The second core structure is laterally bonded to the first core structure at a complex splice joint between the first endwall and the second endwall.

A multistable compliant mechanism is formed by connecting sequentially multiple basic units front to end to form a closed annular structure. Each basic unit includes two flexible hinges perpendicular to each other on different planes and two rigid connection parts for connecting the flexible hinges. The two flexible hinges are connected by a rigid connection part, and one of the flexible hinges is connected to a flexible hinge of an adjacent basic unit through the other rigid connection part. Lengths of two rigid connection parts in a same basic unit are equal, but lengths of rigid connection parts of different basic units are not necessarily equal. The multistable compliant mechanism features the continuous rotation and multi-steady state of a tri-compliant mechanism. The multistable compliant mechanism also features variable mechanism topology, an adjustable unit number, easy implementation, and promotion. A method for steady state analysis of the multistable compliant mechanism is also provided.