Stiffness optimization of non-linear elastic structures
(2018) In Computer Methods in Applied Mechanics and Engineering 330. p.292-307- Abstract
This paper revisits stiffness optimization of non-linear elastic structures. Due to the non-linearity, several possible stiffness measures can be identified and in this work conventional compliance, i.e. secant stiffness designs are compared to tangent stiffness designs. The optimization problem is solved by the method of moving asymptotes and the sensitivities are calculated using the adjoint method. For the tangent cost function it is shown that although the objective involves the third derivative of the strain energy an efficient formulation for calculating the sensitivity can be obtained. Loss of convergence due to large deformations in void regions is addressed by using a fictitious strain energy such that small strain linear... (More)
This paper revisits stiffness optimization of non-linear elastic structures. Due to the non-linearity, several possible stiffness measures can be identified and in this work conventional compliance, i.e. secant stiffness designs are compared to tangent stiffness designs. The optimization problem is solved by the method of moving asymptotes and the sensitivities are calculated using the adjoint method. For the tangent cost function it is shown that although the objective involves the third derivative of the strain energy an efficient formulation for calculating the sensitivity can be obtained. Loss of convergence due to large deformations in void regions is addressed by using a fictitious strain energy such that small strain linear elasticity is approached in the void regions. A well posed topology optimization problem is formulated by using restriction which is achieved via a Helmholtz type filter. The numerical examples provided show that for low load levels, the designs obtained from the different stiffness measures coincide whereas for large deformations significant differences are observed.
(Less)
- author
- Wallin, Mathias LU ; Ivarsson, Niklas LU and Tortorelli, Daniel
- organization
- publishing date
- 2018-03-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Finite strains, Non-linear elasticity, Stiffness optimization, Topology optimization
- in
- Computer Methods in Applied Mechanics and Engineering
- volume
- 330
- pages
- 16 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85034860957
- ISSN
- 0045-7825
- DOI
- 10.1016/j.cma.2017.11.004
- project
- Design of functionalized advanced polymer materials using optimisation techniques
- language
- English
- LU publication?
- yes
- id
- 5a244785-6287-4272-81af-c8683da53e0e
- date added to LUP
- 2017-12-07 09:56:33
- date last changed
- 2022-03-09 07:39:56
@article{5a244785-6287-4272-81af-c8683da53e0e,
abstract = {{<p>This paper revisits stiffness optimization of non-linear elastic structures. Due to the non-linearity, several possible stiffness measures can be identified and in this work conventional compliance, i.e. secant stiffness designs are compared to tangent stiffness designs. The optimization problem is solved by the method of moving asymptotes and the sensitivities are calculated using the adjoint method. For the tangent cost function it is shown that although the objective involves the third derivative of the strain energy an efficient formulation for calculating the sensitivity can be obtained. Loss of convergence due to large deformations in void regions is addressed by using a fictitious strain energy such that small strain linear elasticity is approached in the void regions. A well posed topology optimization problem is formulated by using restriction which is achieved via a Helmholtz type filter. The numerical examples provided show that for low load levels, the designs obtained from the different stiffness measures coincide whereas for large deformations significant differences are observed.</p>}},
author = {{Wallin, Mathias and Ivarsson, Niklas and Tortorelli, Daniel}},
issn = {{0045-7825}},
keywords = {{Finite strains; Non-linear elasticity; Stiffness optimization; Topology optimization}},
language = {{eng}},
month = {{03}},
pages = {{292--307}},
publisher = {{Elsevier}},
series = {{Computer Methods in Applied Mechanics and Engineering}},
title = {{Stiffness optimization of non-linear elastic structures}},
url = {{http://dx.doi.org/10.1016/j.cma.2017.11.004}},
doi = {{10.1016/j.cma.2017.11.004}},
volume = {{330}},
year = {{2018}},
}