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Topology Optimization for Additive Manufacturing

Söderhjelm, Kajsa LU (2017) In ISRN LUTFD2/TFHF-17/5222-SE(1-60) FHL820 20171
Solid Mechanics
Abstract
Topology optimization answers the question "How to place the material within a prescribed
design domain in order to obtain the best structural performance? " and the design
obtained is usually complex. Additive manufacturing comes with a well known design
freedom and the design provided by topology optimization can be manufactured without
as many constraints as conventional manufacturing methods. However, there does exist a
few constraints that needs to be considered such as minimum feature size, enclosed voids,
and overhang. This work focus on overcoming the overhang constraint.
A new method proposed by Langelaar (2017) solved with the optimality criteria with a
density filter provides printable structures regarding the overhang... (More)
Topology optimization answers the question "How to place the material within a prescribed
design domain in order to obtain the best structural performance? " and the design
obtained is usually complex. Additive manufacturing comes with a well known design
freedom and the design provided by topology optimization can be manufactured without
as many constraints as conventional manufacturing methods. However, there does exist a
few constraints that needs to be considered such as minimum feature size, enclosed voids,
and overhang. This work focus on overcoming the overhang constraint.
A new method proposed by Langelaar (2017) solved with the optimality criteria with a
density filter provides printable structures regarding the overhang constraint. The method
is very computationally efficient, but the overhang angle is tied to the element discretization
and the printing direction needs to be axiparallel to the coordinate axis. This results
in that in order to change the inclination angle for the overhang, the element discretization
needs to be changed and the printing direction can not be optimized. Instead a new
method is proposed using the element density gradients in order alter the design to overcome
the overhang constraint. The optimization is solved using the method of moving
asymptotes with an extended density based Helmholtz PDE filter. The result shows that
the structure is affected by the added constraint. However, the provided design does not
provide completely printable structures. Further work is necessary in order to optimize
the parameters and get fully printable designs. (Less)
Popular Abstract (Swedish)
3D-utrskrivning och topologioptimering kan ses som det perfekta paret där varje part lyfter upp respektives bästa sida, topologioptimering optimerar styrkan mot ett volymvillkor och 3D-utskrivning möjliggör tillverkning. En ny metod presenteras som tar hänsyn till överhäng i 3D-utskrivning för att slippa eventuella stödstrukturer.
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author
Söderhjelm, Kajsa LU
supervisor
organization
course
FHL820 20171
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Topology optimization, Additive manufacturing, Overhang constraint
publication/series
ISRN LUTFD2/TFHF-17/5222-SE(1-60)
language
English
id
8928717
date added to LUP
2017-11-22 09:19:41
date last changed
2017-11-22 09:19:41
@misc{8928717,
  abstract     = {Topology optimization answers the question "How to place the material within a prescribed
design domain in order to obtain the best structural performance? " and the design
obtained is usually complex. Additive manufacturing comes with a well known design
freedom and the design provided by topology optimization can be manufactured without
as many constraints as conventional manufacturing methods. However, there does exist a
few constraints that needs to be considered such as minimum feature size, enclosed voids,
and overhang. This work focus on overcoming the overhang constraint.
A new method proposed by Langelaar (2017) solved with the optimality criteria with a
density filter provides printable structures regarding the overhang constraint. The method
is very computationally efficient, but the overhang angle is tied to the element discretization
and the printing direction needs to be axiparallel to the coordinate axis. This results
in that in order to change the inclination angle for the overhang, the element discretization
needs to be changed and the printing direction can not be optimized. Instead a new
method is proposed using the element density gradients in order alter the design to overcome
the overhang constraint. The optimization is solved using the method of moving
asymptotes with an extended density based Helmholtz PDE filter. The result shows that
the structure is affected by the added constraint. However, the provided design does not
provide completely printable structures. Further work is necessary in order to optimize
the parameters and get fully printable designs.},
  author       = {Söderhjelm, Kajsa},
  keyword      = {Topology optimization,Additive manufacturing,Overhang constraint},
  language     = {eng},
  note         = {Student Paper},
  series       = {ISRN LUTFD2/TFHF-17/5222-SE(1-60)},
  title        = {Topology Optimization for Additive Manufacturing},
  year         = {2017},
}