Force-displacement curve; Hardening and softening nonlinearities
Abstract :
[en] The objective of this study is to develop an optimization methodology to find a layout that traces a prescribed force-displacement curve through a topology optimization approach. To this end, we propose an objective function to minimize the difference between a prescribed force-displacement curve and the curve calculated at each iteration of the optimization process. Slope constraints are introduced to solve issues encountered when using a small number of target points. In addition, a projection filter is employed to suppress the gray region observed between the solid and void regions, which generally occurs when using a density-based filter. A recently proposed energy interpolation scheme is implemented to stabilize the instability in the nonlinear analysis, which generally results from excessive distortion in the void region when the structure is modeled on a fixed mesh in the topology optimization process. To validate the outlined methodology, several case studies with different types of nonlinearity and structural features of the obtained layouts are investigated.
Disciplines :
Mechanical engineering
Author, co-author :
Lee, Jongsuh ; Department of Mechanical Engineering, Dong-A University, Busan, South Korea
Detroux, Thibaut ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Enforcing a force-displacement curve of a nonlinear structure using topology optimization with slope constraints
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