Design concepts for anisotropic adaptive lattices compounded of triangular
multimaterial cells are considered. The lattices connect two parts of a structure
(referred here as the substrates) made of materials with different coefficients of
thermal expansion (CTEs) and subject to large variation of temperature. They are
designed to eliminate mismatched thermal expansion and provide constant
independent of temperature distance between the substrates. Because all connections
with the substrates and within the lattice are made with pins, the whole structure is
free of bending and thermal expansion mismatch stresses. The designed lattices are
scale independent. Relationships between cell geometry (triangle angles and
height) and the CTEs of selected lattice materials are obtained. Two-cell
and three-cell one-row and five-cell two-row planar lattices are designed.
Furthermore, axisymmetric adaptive lattice assembly is considered. Such a
lattice can have cylindrical or conical shape and may be compounded of
several rows. Cell members in all designed lattices are made of conventional
materials. Lattice materials providing the largest structural efficiency are
recommended.
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