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Discretising the regularised integral equation (3.141) with
piecewise constant shape functions, we obtain




(3.155) 
where S_{J} is a plane element in S_{y} and
represents
on S_{J}. In the evaluation of the integral in (3.157)
we divide (3.139) into the static part (the fundamental solution of
the equation of elastostatics) and the residual part as follows:
where
and
are given by



(3.156) 
where
.
Namely, we treat four integrals to compute
(3.157) as follows:
In the computation of the integrals related to
we expand (3.158) into the following form:
When k_{T}R is small we use the following series instead of
(3.160)
We compute the integrals related to the static part in (3.159)
analytically and the rest numerically with Gaussian quadrature.
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Kenichi Yoshida
20010728