Turbine ring assembly with curved rectilinear seatings

A turbine ring assembly comprising:

• a plurality of ring sectors forming a turbine ring;
• and
• a ring support structure,
• each ring sector having, in a section plane defined by an axial direction and a radial direction of the ring and orthogonal to a circumferential direction of the turbine ring, a part forming an annular base with, in the radial direction of the turbine ring, an internal face defining the internal face of the turbine ring and an external face from which extend as projections a first and a second attachment tabs,
• the ring support structure including a central shell ring from which extend as projections a first radial flange and a second radial flange to retain each ring sector, and an annular ring-flange having a free first end seated against the first attachment tab and a second end opposite to the first end and cooperating with the first radial flange,
• each ring sector extending between a first circumferential end and a second circumferential end each intended to face another adjacent ring sector in the circumferential direction, and comprising a first rectilinear seating surface positioned on an upstream face of the first attachment tab in contact with the annular ring-flange and a second rectilinear seating surface positioned on a downstream face of the second attachment tab in contact with the second radial flange, each of the first and second rectilinear seating surfaces extending along a tangent to the circumferential direction between the first and second circumferential ends of the ring sector,
• wherein a downstream face of the annular-ring flange is only in axial contact with the first rectilinear seating surface, and an upstream face of the second radial flange is only in axial contact with the second rectilinear seating surface, and
• wherein the rectilinear seating surfaces of each ring sector have, along said tangent to the circumferential direction, a variable thickness in the axial direction with a minimum thickness at the first and second circumferential ends of the ring sector and a maximum thickness in a median portion of the rectilinear seating surface.