TY - JOUR
T1 - A new thickness parameterization for Discrete Material and Thickness Optimization
AU - Sjølund, J. H.
AU - Peeters, D.
AU - Lund, E.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - In this work, a new thickness parameterization which allows for internal ply-drops without intermediate voids is introduced in the Discrete Material and Thickness Optimization (DMTO) method. With the original DMTO formulation, material had to be removed from the top in order to prevent non-physical intermediate voids in the structure. The new thickness formulation relies on a relation between density variables and ply-thicknesses rather than constitutive properties. This new formulation allows internal ply-drops which is essential for composite structures as it is common practice to cover dropped plies as to avoid delaminations. Furthermore, it is demonstrated how the new thickness formulation in some cases improves the convergence characteristics. Finally, it is also shown how solid-shell elements can be utilized within the DMTO method for structural optimization of tapered laminated composite structures.
AB - In this work, a new thickness parameterization which allows for internal ply-drops without intermediate voids is introduced in the Discrete Material and Thickness Optimization (DMTO) method. With the original DMTO formulation, material had to be removed from the top in order to prevent non-physical intermediate voids in the structure. The new thickness formulation relies on a relation between density variables and ply-thicknesses rather than constitutive properties. This new formulation allows internal ply-drops which is essential for composite structures as it is common practice to cover dropped plies as to avoid delaminations. Furthermore, it is demonstrated how the new thickness formulation in some cases improves the convergence characteristics. Finally, it is also shown how solid-shell elements can be utilized within the DMTO method for structural optimization of tapered laminated composite structures.
KW - Discrete Material and Thickness Optimization
KW - Laminated composites
KW - Manufacturing constraints
UR - http://www.scopus.com/inward/record.url?scp=85053691344&partnerID=8YFLogxK
U2 - 10.1007/s00158-018-2093-1
DO - 10.1007/s00158-018-2093-1
M3 - Journal article
AN - SCOPUS:85053691344
SN - 1615-147X
VL - 58
SP - 1885
EP - 1897
JO - Structural and Multidisciplinary Optimization
JF - Structural and Multidisciplinary Optimization
IS - 5
ER -