boundary element formulation for viscoelastic structures using the sls model

in this paper ,from the basic assumption of viscoelastic constitutive equation and weighted residual techniques ,a simple but effective boundary element formulation is implemented by the standard linear solid(sls) viscoelastic model.aresponse closer to that of a real viscoelastic structure is obtained from the sls model describing both stress relaxation and creep. this formulation needs only the kelvin’s fundamental solution of isotropic elastostatic with material constants prescribed as explicit function of time . this approach avoids the use of relaxation functions and mathemathical transformation, and it is able to solve the visco-elastostatic problems with any load time-dependence and boundary conditions.