Thermally adaptive bump foil of a gas foil bearing

A component of a gas foil bearing, comprising:

• a plurality of material layers forming a composition gradient that defines a first coefficient of thermal expansion (CTE) and a second CTE that differs from the first CTE,
• wherein the plurality of material layers include at least two metals, plastics, or fiber filled metals or plastics, that are layered on top of each other, such that the layers define the first and second CTEs, and
• wherein when the component is subject to heating, the component changes from a first shape to a second shape, and
• wherein the component is a bump foil defining peaks and troughs that define an undulating profile;
• wherein:
• the first shape is a curved triangle that includes the peaks and troughs to define the undulating profile;
• and
• the second shape is circular and includes the peaks and troughs to define the undulating profile.