- Title: Taking into account thermal residual stresses in topology optimization
of structures built by additive manufacturing
In this talk I will discuss a model and several constraints for shape
and topology optimization of structures,
built by additive manufacturing techniques. The goal of these
constraints is to take into account
the thermal residual stresses or the thermal deformations, generated by
processes like Selective Laser Melting,
right from the beginning of the structural design optimization. In other
words, the structure is optimized
concurrently for its final use and for its behavior during the layer by
layer production process.
It is well known that metallic additive manufacturing generates very
high temperatures and heat
fluxes, which in turn yield thermal deformations that may prevent the
coating of a new powder
layer, or thermal residual stresses that may hinder the mechanical
of the final design. Our proposed constraints are targeted to avoid
these undesired effects.
Shape derivatives are computed by an adjoint method and are incorporated
into a level set
numerical optimization algorithm. Several 2-d and 3-d numerical examples
interest and effectiveness of our approach.
This is a joint work with Lukas Jakabcin.