A thermally expandable sheet according to the present invention includes a stress buffer layer provided on one surface of a base material and having an elastic property, a thermal expansion layer provided on the stress buffer layer and containing a first thermally expandable material that expands according to heat and a first binder, and a cover layer provided on the thermal expansion layer and having an elastic property.

A foam molding article includes an outer-shell-configuring part, an insert that is at least partially embedded in the outer-shell-configuring part, and a fitting member. The outer-shell-configuring part includes a body side foam member. The body side foam member includes a foam and a missing part where a part of the foam is missing. The missing part is located in an intermediate part of the body side foam member, and the fitting member is mounted in the missing part.

This invention relates to extruded composite materials specifically focusing on the increasing load bearing capacity and the overall strength of composites. Injectable conformable structural core materials are used to replace foam cells inside extruded composite materials thereby increasing the overall load bearing stability and strength. The core materials are tailored to have a desired CTE with respect to the structural materials. The core materials may also incorporate fibers and solid structural fillers for increasing the strength of the composite member. The objective is to enable composite materials to have the highest structural load bearing capability possible so that these technologies can be used as the replacement of wood, in aerospace applications and for other purposes.

A thermally expandable sheet according to the present invention includes a stress buffer layer provided on one surface of a base material and having an elastic property, a thermal expansion layer provided on the stress buffer layer and containing a first thermally expandable material that expands according to heat and a first binder, and a cover layer provided on the thermal expansion layer and having an elastic property.

This invention relates to extruded composite materials specifically focusing on the increasing load bearing capacity and the overall strength of composites. Injectable conformable structural core materials are used to replace foam cells inside extruded composite materials thereby increasing the overall load bearing stability and strength. The core materials are tailored to have a desired CTE with respect to the structural materials. The core materials may also incorporate fibers and solid structural fillers for increasing the strength of the composite member. The objective is to enable composite materials to have the highest structural load bearing capability possible so that these technologies can be used as the replacement of wood, in aerospace applications and for other purposes.

A foam molding article includes an outer-shell-configuring part, an insert that is at least partially embedded in the outer-shell-configuring part, and a fitting member. The outer-shell-configuring part includes a body side foam member. The body side foam member includes a foam and a missing part where a part of the foam is missing. The missing part is located in an intermediate part of the body side foam member, and the fitting member is mounted in the missing part.

A method for manufacturing a turbine blade comprising designing a turbine blade includes receiving initial geometrical and aerodynamic information of the turbine blade, obtaining the maximum amount of stress within a determined area of maximum stress, and obtaining a safety factor by dividing material yield stress of the turbine blade by the maximum amount of stress. The method further includes performing a first plurality of operations responsive to the safety factor being less than 1.5 and the determined area of maximum stress occurring at the junction of the blade airfoil and the blade root. The first plurality of operations includes creating a fillet at the junction of the blade airfoil and the blade root and increasing respective thickness of each airfoil slice of the plurality of airfoil slices with a distance from the junction of the blade airfoil and the blade root of no more than 15% of the blade airfoil length.

Polypropylene-based sheet materials such as a polypropylene-based foam sheet material and a multilayered sheet material including the polypropylene-based foam as a layer are disclosed. The multilayered sheet material may include the polypropylene-based foam layer sandwiched between and adhered to outer polypropylene-based polymer films to provide a multilayered sheet material. The polypropylene-based foam sheet and multilayered sheet material including the polypropylene-based foam as a layer may be used in the production of printed products such as sign panels.