TY - EJOU AU - Dumont, N.A. AU - Mamani, E.Y. TI - Generalized Westergaard Stress Functions as Fundamental Solutions T2 - Computer Modeling in Engineering \& Sciences PY - 2011 VL - 78 IS - 2 SN - 1526-1506 AB - A particular implementation of the hybrid boundary element method is presented for the two-dimensional analysis of potential and elasticity problems, which, although general in concept, is suited for fracture mechanics applications. Generalized Westergaard stress functions, as proposed by Tada, Ernst and Paris in 1993, are used as the problem's fundamental solution. The proposed formulation leads to displacement-based concepts that resemble those presented by Crouch and Starfield, although in a variational framework that leads to matrix equations with clear mechanical meanings. Problems of general topology, such as in the case of unbounded and multiply-connected domains, may be modeled. The formulation, which is directly applicable to notches and generally curved, internal or external cracks, is specially suited for the description of the stress field in the vicinity of crack tips and is an easy means of evaluating stress intensity factors and of checking some basic concepts laid down by Rice in 1968. The paper focuses on the mathematical fundamentals of the formulation. One validating numerical example is presented. KW - Westergaard stress functions KW - Hellinger-Reissner potential KW - hybrid 3em boundary element KW - variational methods DO - 10.3970/cmes.2011.078.109