Abstract: A bolt which extends into the first casing part, into the hole in the barrel nut, and into the second casing part, wherein the bolt engages with the barrel nut so as to join the first casing part to the second casing part; wherein the barrel nut includes a first portion and a second portion, wherein the first portion of the barrel nut is structurally weaker than the second portion of the barrel nut such that, if a predetermined load between the first casing part and the second casing part is exceeded, the first portion of the barrel nut becomes crushed while the second portion of the barrel nut remains engaged with the bolt. The casing assembly may be included in a gas turbine engine.

Abstract: A component, for example an aerofoil vane or other gas path structure in a gas turbine machine such as a gas turbine engine, in which an insulated electrical conductor path is embedded structurally integrally, and in which electromagnetic shielding, for the embedded electrical conductor path is provided structurally integrally.

Abstract: A bolt which extends into the first casing part, into the hole in the barrel nut, and into the second casing part, wherein the bolt engages with the barrel nut so as to join the first casing part to the second casing part; wherein the barrel nut includes a first portion and a second portion, wherein the first portion of the barrel nut is structurally weaker than the second portion of the barrel nut such that, if a predetermined load between the first casing part and the second casing part is exceeded, the first portion of the barrel nut becomes crushed whilst the second portion of the barrel nut remains engaged with the bolt. The casing assembly may be included in a gas turbine engine.

Abstract: A component, for example an aerofoil vane or other gas path structure in a gas turbine machine such as a gas turbine engine, in which an insulated electrical conductor path is embedded structurally integrally, and in which electromagnetic shielding, for the embedded electrical conductor path is provided structurally integrally.

Abstract: An assembly includes a first member and a second member, the first member including a first material composition and the second member including a second material composition. The first and second material compositions each include one or more isotopes of the same element, which are arranged to permit distinguishing between the first and second members or 0 parts thereof.

Abstract: An impactor containment system including a laminate material, the laminate material having a face sheet, a cellular filling providing a crushable layer one side of which layer is arranged on the face sheet, and a stiff backing layer arranged on other side of the crushable layer, wherein the face sheet is provided with zones of weakness.

Abstract: An assembly includes a first member and a second member, the first member including a first material composition and the second member including a second material composition. The first and second material compositions each include one or more isotopes of the same element, which are arranged to permit distinguishing between the first and second members or 0 parts thereof.

Abstract: A gas turbine engine blade containment system that includes a laminate material including first and second layers. The first layer is an inner layer within the second layer. The second layer includes a plurality of resiliently compressive springs extending transversely relative to the first layer, and each spring is encased in a crushable support material. The first layer includes a hard material to blunt a broken blade. The springs in the second layer are compressed and the crushable support material of the second layer is crushed to absorb energy of a broken blade.

Abstract: Components formed with a polymer matrix are subject to problems in relation to shrinkage as that polymer matrix cures. With regard to components incorporating reinforcing fibres, such shrinkage may tension and curl the fibres resulting in stresses within the component and premature failure. By providing voids or expandable beads, which alter in size to compensate for volumetric variation in the polymer matrix during curing, such tension may be avoided. Advantageously, the voids or expandable beads have a shape such that there is a reduction in void surface area as the void or expandable bead increases in volume.