Rotor blade assemblies for turbine engines

A rotor blade assembly for a turbine engine, comprising:

• an upper blade carrier, including a forearm extension extending in a longitudinal direction and an aft arm extension extending in the longitudinal direction opposite the forearm extension;
• a lower blade carrier;
• an airfoil blade comprising an outer diameter end coupled to the upper blade carrier and an inner diameter end coupled to the lower blade carrier;
• a disk rigidly coupled to the lower blade carrier via a pin;
• an outer drum coupled to the forearm extension of the upper blade carrier defining a radial joint, wherein the radial joint supports radial motion of the upper blade carrier relative to an axis extending through a center of the rotor blade assembly;
• and
• an outer shroud comprising an aft projection comprising a locating surface, wherein:
• the upper blade carrier comprises a centering rabbet comprising a concave surface and coupled to the aft arm extension;
• the locating surface contacts the concave surface to restrict movement of the upper blade carrier in the longitudinal direction;
• the outer drum defines a spline mounting recess;
• the upper blade carrier comprises a spline coupled to the aft arm extension;
• the aft projection comprises an engagement surface;
• the spline and the aft projection extend into the spline mounting recess and define a spline joint;
• and
• the spline contacts the engagement surface to limit movement of the aft arm extension in a radial direction.

A rotor blade assembly for a turbine engine, comprising:

• a lower blade carrier comprising a mounting flange;
• an airfoil blade comprising an outer diameter end and an inner diameter end, the inner diameter end coupled to the lower blade carrier, and the airfoil blade extending radially from the lower blade carrier toward the outer diameter end;
• a disk;
• a bore extending through the mounting flange and the disk;
• and
• a pin extending through the bore, wherein the pin includes a shank and a self-locking assembly circumferentially surrounding the shank to rigidly couple the lower blade carrier to the disk;
• wherein the self-locking assembly includes a first locking component and a second locking component arranged along a longitudinal axis of the pin, each locking component comprising a first angled surface and a second angled surface, the second angled surface of the first locking component being engaged with the first angled surface of the second locking component in an overlapping configuration, and the first and second angled surfaces of the first locking component and the first and second angled surfaces of the second locking component are oblique to the longitudinal axis.