Thursday, 7 May 2020 Speaker: Prof. Michele Chiumenti International Center for Numerical Methods in Engineering (CIMNE) | Universitat Politècnica de Catalunya (UPC) Developments in Additive Manufacturing Processes: Industrial Technologies and Numerical Analyses

Abstract

In this work, the current developments on the numerical simulation of different AM processes are presented. A fully coupled thermo-mechanical framework has been tailored to the analysis of several 3D-printing processes ranging from metal or polymers extrusion and melting, to technologies for civil and architectural applications. The accurate definition of the material deposition is addressed, taking into account actual movement of the heat source along the scanning path as defined for the machine. The result is a high-fidelity simulation of the AM process leading to an accurate layer-by-layer building sequence. An advanced high-performance and object-oriented software platform has been enhanced to include the parallel FE activation technique used to follow the growth of the geometry according to the fabrication process. The mesh adaptivity strategy makes use of Cartesian grids together with octree-type local refinements and global coarsening to keep controlled the total number of elements in the computational domain. The thermo-viscoelastic-viscoplastic constitutive model introduced is calibrated and the numerical results are validated through an extensive experimental campaign carried out taking advantage of the partnership with several research center such as: the Northwestern Polytechnical University (Xi'an, China), the Monash University (Melbourne, Australia), IK4-Lortek, Leitat, Eurecat (Spain), among others.

Biography

Education

• Civil Engineer and MCs in Structural Analysis (Politécnico di Milano, 1994)
• Ingeniero de Caminos, Canales y Puertos (Universitat Politècnica de Catalunya, UPC, 2004)
• Ph.D. degree as Dr Ingeniero de Caminos, Canales y Puertos (UPC, 1999)

Positions

• Tenured Professor of Continuum Mechanics and Structural Analysis (Dep. of Civil and Environmental Engineering - DECA, UPC, since 2004)
• Deputy Director of Master and Doctoral programs in Civil Engineering (Civil Engineering School of UPC, since 2012)
• Full Research Professor (Structural Mechanics group) at the International Center for Numerical Methods in Engineering (CIMNE)
• Software developer and product manager (VULCAN software) at Quantech-ATZ

Articles selection

Related to the seminar about additive manufacturing

• L. Tamellini, M. Chiumenti, C. Altenhofen, M. Attene, O.Barrowclough, M. Livesu, F. Marini, M. Martinelli, V. Skytt.
  Parametric shape optimization for combined additive-subtractive manufacturing,
  JOM 72, 448–457, 2020.


• E. Neiva, S. Badia, A.F. Martin and M. Chiumenti.
  A scalable parallel finite element framework for growing geometries. Application to metal additive manufacturing,
  Int. J. Numer. Methods. Eng. 119, 1098-1125, 2019.


• X. Lu, X. Lin, M. Chiumenti, M. Cervera, Y. Hu, X. Ji, H. Yang and W. Huang.
  Residual stresses and distortion of rectangular an S-shaped Ti-6Al-4V Laser Solid Forming parts: modelling and experimental calibration,
  Additive Manufacturing 26, 166-179, 2019.


• E. Salsi, M. Chiumenti and M. Cervera.
  Modeling of microstructure evolution in Additive Manufacturing processes of Ti-6Al-4V,
  Metals 8, 633 ,2018.

Related to Friction Stir Welding (also studied at LMS, PhD thesis of Nicolas Dimov)

• N. Dialami, M. Cervera and M. Chiumenti.
  Effect of the Tool Tilt Angle on the Heat Generation and the Material Flow in Friction Stir Welding
  Metals 9, 28, 2019.


• N. Dialami, M. Cervera and M. Chiumenti.
  Numerical Modelling of Microstructure Evolution in Friction Stir Welding (FSW)
  Metals 8, 183, 2018.

LMS seminars on related topics

• 30/04/2020, Dr. Eric A. Jägle, Controlling phase transformations during laser AM - the intrinsic heat treatment effect and beyond

Documents compiled by Nicolas Dimov and Camille Guévenoux.