An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface
is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect
strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to
shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are
formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and
mechanical loads.
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