PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 637–647

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Lattice topology optimization can stimulate the design of new materials with spatially dependent properties for 3D printed components. The present work considers a mounting bracket for an industrial robotic arm as a case study, having as main objective the increase of the fundamental frequency and its mass reduction. A homogenized model based on the lattice optimization was considered by using the ANSYS software: initially the orthotropic lattice material was optimized by using a variable cubic cell lattice density distribution in the geometric model; in the second stage a homogenization procedure considered different volume fractions and variable density for four different types of cells. Starting from a fundamental frequency of 839 Hz for the unoptimized bracket, it increased to 1227 Hz obtained with lattice optimization, and to 1366 Hz after homogenization. The mass was reduced to more than half. A complementary study presents the possibilities available in ANSYS to use the SMART (Separating Morphing and Adaptive Remeshing Technology) procedure for crack-growth simulations. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Lattice topology; homogenization; fundamental frequency; mass reduction; crack propagation; SMART 1. Introduction Additive manufacturing (AM) enables design features that are impractical or impossible to fabricate using conventional manufacturing methods. One class of newly enabled features is that of internal lattice structures. Due to 1st Virtual European Conference on Fracture Lattice topology homogenization and crack propagation through finite element analyses Florian Vlădulescu a , Dan Mihai Constantinescu b * a INAS S.A., Bulevardul Romanescu nr. 37C, 200738 Craiova, Romania b Department of Strength of Materials, University POLITEHNICA of Bucharest, Splaiul Independen ţ ei r. 313, 060042 Bucharest, Romania Abstract Lattice topology optimization can stimulate the design of new materials with spatially dependent properties for 3D printed c mp nents. The present work consid rs a mounti g bracket for an industrial robotic arm as a ca e study, having as ai objectiv th increase of the fund mental frequen y and its mass reduction. A ho ogenized mo el b sed on the lattice op mizatio was consid red by usi g the ANSYS software: initially the orthotr pic lattic materia was optimized by using a v riable cubic cell lattice de si y distribution in th geometric m del; in the second stage a hom genization procedure considered diff ren volume fractions and variabl d nsity for f ur different types of cells. Starting from a fundamental frequ ncy o 839 Hz for the unoptimized b ck t, it increased to 1227 Hz obtained with lattice optimiz tio , nd to 1366 Hz after homogenization. The mass was reduced to more than half. A complementary study presents the possibilities av ilable in ANSYS to use the SMART (Separating Morphing and Adap ive Remeshing Technology) procedure for crack-growth simulations. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y Society (ESIS) ExCo K ywords: Lattice topology; homogenization; fundamental frequency; mass redu tion; crack propagation; SMART 1. Introduction Additive manufacturing (AM) enables design features that are impractical or impossible to fabricate using conventional a fact ri methods. On clas of n wly nabled features is hat of internal lattice structures. D e to 1st Virtual European Conference on Fracture Lattice topology homogenization and crack propagation through finite element analyses Florian Vlădulescu a , Dan Mihai Constantinescu b * a INAS S.A., Bulevardul Romanescu nr. 37C, 200738 Craiova, Romania b Department of Strength of Materials, University POLITEHNICA of Bucharest, Splaiul Independen ţ ei nr. 313, 060042 Bucharest, Romania

* Corresponding author. Tel.: +4-021-402-9204; fax: +4-021-402-9213. E-mail address: dan.constantinescu@upb.ro * Corresponding author. Tel.: +4-021-402-9204; fax: +4-021-402-9213. E-mail address: dan.constantinescu@upb.ro

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of t European Structural Integrity So i ty (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.074