Abstract
In this paper we perform topology optimization of orthotropic elastic design domains in unilateral contact with non-matching meshes by adopting the mortar approach. The motivation is 3D printing of assemblies of parts, where the build direction as well as the contact interfaces between the parts strongly will influence the optimal solutions. Thus, topology optimization of a standard isotropic formulation with tied interfaces might not be a proper approach for this kind of design problems. This is studied in this work by maximizing the potential energy of orthotropic linear elastic bodies in unilateral frictionless contact. In such manner, no extra adjoint equation is needed to be solved and non-zero prescribed displacements are also included in the formulation properly. This will not be true if the compliance is minimized. The contact conditions of the non-matching meshes are treated by deriving the mortar integral from the principle of virtual power by representing the normal contact pressure with the trace of the global displacement shape functions. The mortar integral is then approximated with the Lobatto rule using a high number of integration points. In such manner, we obtain a set of Signorini conditions for each non-matching interface which we solve using the augmented Lagrangian approach and Newtons method. The design domains are formulated with orthotropic linear elasticity where intermediate density values are penalized using SIMP or RAMP, and the regularization is obtained by applying sensitivity or density filters following the approaches of Sigmund and Bourdin. The implementation of the methodology is efficient and produces reliable solutions. This is demonstrated for assemblies of design domains in unilateral contact which is rotated with respect to the build direction of a 3D printer. In particular, compliance as function of build direction is generated for different problems. This kind of curves might be most useful when orienting the parts in order to minimize the volume of support structures.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Zhu, J.-H., Zhang, W.-H., Xia, L.: Topology optimization in aircraft and aerospace structures design. Arch. Comput. Meth. Eng. 23, 595–622 (2016)
Spackman, C.C., Frank, C.R., Picha, K.C., Samuel, J.: 3D printing of fiber-reinforced soft composites: process study and material characterization. J. Manufact. Process. 23, 296–305 (2016)
Wang, X., Jiang, M., Zhou, Z., Gou, J., Hui, D.: 3D printing of polymer matrix composites: a review and prospective. Compos. Part B 110, 442–458 (2017)
Jansson, A., Pejryd, L.: Characterisation of carbon fibre-reinforced polyamide manufactured by selective laser sintering. Add. Manufact. 9, 7–13 (2016)
Zhou, K., Li, X.: Topology optimization of structures under multiple load cases using a fiber-reinforced composite material model. Comput. Mech. 38, 163–170 (2006)
Strömberg, N., Klarbring, A.: Topology optimization of structures in unilateral contact. Struct. Multidisciplinary Optim. 41, 57–64 (2010)
Strömberg, N.: Topology optimization of structures with manufacturing and unilateral contact constraints by minimizing an adjustable compliance-volume product. Struct. Multidisciplinary Optim. 42, 341–350 (2010)
Popp, A., Gitterle, M., Gee, M.W., Wall, W.A.: A dual mortar approach for 3D finite deformation contact with consistent linearization. Int. J. Numer. Meth. Eng. 83, 1428–1465 (2010)
Wilking, C., Bischoff, M.: Alternative integration algorithms for three-dimensional mortar contact. Comput. Mech. 59, 203–218 (2017)
Klarbring, A., Strömberg, N.: Topology optimization of hyperelastic bodies including non-zero prescribed displacements. Struct. Multidisciplinary Optim. 47, 37–48 (2013)
Klarbring, A., Strömberg, N.: A note on the min-max formulation of stiffness optimization including non-zero prescribed displacements. Struct. Multidisciplinary Optim. 45, 147–149 (2012)
Acknowledgements
I am grateful for the financial support from Vinnova (www.vinnova.se) in the project Digi3D (www.digi3d.org).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this paper
Cite this paper
Strömberg, N. (2018). Topology Optimization of Orthotropic Elastic Design Domains with Mortar Contact Conditions. In: Schumacher, A., Vietor, T., Fiebig, S., Bletzinger, KU., Maute, K. (eds) Advances in Structural and Multidisciplinary Optimization. WCSMO 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-67988-4_108
Download citation
DOI: https://doi.org/10.1007/978-3-319-67988-4_108
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-67987-7
Online ISBN: 978-3-319-67988-4
eBook Packages: EngineeringEngineering (R0)