This paper presents the formulation of a triangular finite element with an
embedded interface, designed for the simulation of discrete crack propagati
on processes. The element is developed within a displacement-based framewor
k. Linear interpolation of the displacement discontinuities along the inter
nal interface is assumed in order to ensure compatibility across inter-elem
ent boundaries. The proper representation of the rigid body motions and the
solvability of the discretised version of the mechanical problem in point
are specifically addressed. Finally, the element performance is illustrated
through comparison with some alternative proposals.