摘要：In this work, the integration of singular kernels in a specially developed
hole or inclusion boundary element is accomplished by the direct method.
These elements are custom tailored for modeling two-dimensional
microstructures containing cylindrical holes and/or inclusions, so that each
micro-heterogeneity is represented by a single element. The traditional
discretization in several boundary elements is then avoided. Using the direct
method, all strongly singular integrals present in the element matrices
are regularized. The convergence behavior of the proposed scheme
is analyzed for several quadrature orders.
