Abstract: A bullet-resistant armor element for use as a tessellation in a flexible armor matrix has a hard main body and a facing over said main body, such as layer of polymeric or polymer matrix composite material, wherein the facing has an acoustic impedance which is substantially lower than the acoustic impedance of the main body. Groups of said elements tessellate to form an aperture between the adjacent elements, and a cover element is arranged to cover said aperture. Limit stops restrict the degree of articulation between the adjacent elements. The elements include a deflector for deflecting bullet splash and traps for collecting bullet splash.

Abstract: A bullet-resistant armour element for use as a tessellation in a flexible armour matrix has a hard main body and a facing over said main body, such as layer of polymeric or polymer matrix composite material, wherein the facing has an acoustic impedance which is substantially lower than the acoustic impedance of the main body. Groups aid elements tessellate to form an aperture between the adjacent elements, and a cover element is arranged to cover said aperture. Limit stops restrict the degree of articulation between the adjacent elements. The elements include a deflector for deflecting bullet splash and traps for collecting bullet splash.

Abstract: An insert (10) for use in clothing designed to protect against bullets or knife attacks includes an upper layer (14) having a ceramic matrix. A pair of plugs (20) are fitted to the ceramic layer (14), the plugs (20) being made from a material having an impedance to vibration substantially the same as that of the ceramic matrix at the point of manufacture. The plugs (20) are configured for conducting mechanical vibration through the ceramic layer (14), for recording a vibration-related signature for the insert (10). By comparing a series of such signatures recorded over time, it is possible to assess whether the internal structure of the ceramic matrix has become damaged, which is useful in determining whether the insert needs to be replaced or repaired.