Modeling thermal and mechanical cancellation of residual stress from hybrid additive manufacturing by laser peening

Guru Madireddy, Chao Li, Jingfu Liu, Michael P. Sealy

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Additive manufacturing (AM) of metals often results in parts with unfavorable mechanical properties. Laser peening (LP) is a high strain rate mechanical surface treatment that hammers a workpiece and induces favorable mechanical properties. Peening strain hardens a surface and imparts compressive residual stresses improving the mechanical properties of a material. This work investigates the role of LP on layer-by-layer processing of 3D printed metals using finite element analysis. The objective is to understand temporal and spatial residual stress development after thermal and mechanical cancellation caused by cyclically coupling printing and peening. Re- sults indicate layer peening frequency is a critical process parameter affecting residual stress redistribution and highly interdependent on the heat generated by the printing process. Optimum hybrid process conditions were found to exists that favorably enhance mechanical properties. With this study, hybrid-AM has ushered in the next evolutionary step in AM and has the potential to profoundly change the way high value metal goods are manufactured.

Original languageEnglish (US)
Pages (from-to)49-60
Number of pages12
JournalNami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering
Volume2
Issue number2
DOIs
StatePublished - Jun 1 2019

Keywords

  • Additive manufacturing
  • Finite element analysis
  • Hybrid
  • Laser peening
  • Residual stress

ASJC Scopus subject areas

  • Instrumentation
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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