Discussion: "Isotropic Clamped-Free

. Mathematically speaking, theseries in Eq. 1 can be seen as the summation of Trefftz bases. Tosimulate the concentrated force, a circularly distributed force us-ing the Fourier series is used. Then, the author utilized two bound-ary conditions BCs in each part, two continuity, and two equi-librium conditions on the interface to determine the eightunknown coefficients. Variation of deflection coefficients, radialmoment coefficients, and shear coefficients along radial positionsand angles was presented. However, some results are misleading.To investigate these inconsistencies, both null-field integral for-mulation and finite element method FEM using the