Provided is a composite joint comprising a pair of composite panels each
defining a composite panel thickness and having an inner face sheet and
an outer face sheet sandwiching a core panel therebetween. The core panel
defines a constant thickness portion and a ramp portion along which the
core panel tapers to a reduced thickness portion. The outer face sheet is
thickened in the area of the reduced thickness portion. The core panel
includes a plurality of cells extending between the inner and outer face
sheets. The cells within the reduced thickness portions are filled with a
filler material. The cells within the ramp portions and constant
thickness portions are filled with aerogel. A primary splice plate
extends across the reduced thickness portions. Mechanical fasteners
extend through the outer face sheet and into the primary and secondary
splice plates. A themal barrier compound covers the primary splice plate.