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A new method to estimate the residual stresses in additive manufacturing characterized by point heat source

A new method to estimate the residual stresses in additive manufacturing characterized by point heat source

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Tidsskriftspublikasjon
Sammendrag
Residual stress in additive manufacturing (AM) is one of the key challenges in terms of structural integrity and finish quality of printed components. Estimating the residual stress distribution on additively manufactured components is complex and computationally expensive with full scale thermo-mechanical FE analysis. In this study, a point heat source is utilized to explore the thermal field and residual stress distribution during the manufacturing processes. Numerical results show that the residual stress at a single material point can be expressed as a function of its spatial position and the peak nodal temperature it has experienced during thermal cycles. The residual stress distribution can be divided into three segments according to the peak nodal temperature. The peak nodal temperature only depends on the heat flux and the distance to the point heat source center. A semi-analytical approach to predict the peak nodal temperature and residual stresses, once the heat flux is known, is proposed. The proposed approach is further validated by a numerical additive manufacturing model and a very good agreement is obtained. Compared to the thermo-mechanical FE model, the proposed method significantly improves the computational efficiency, showing great potential for residual stress prediction.
Oppdragsgiver
  • Norges forskningsråd / 269558
Språk
Engelsk
Forfatter(e)
  • Sun Li
  • Ren Xiaobo
  • He Jianying
  • Olsen Jim Stian
  • Pallaspuro Sakari
  • Zhang Zhiliang
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Materialer og nanoteknologi
  • Oulun yliopisto
År
2019
Publisert i
The International Journal of Advanced Manufacturing Technology
ISSN
0268-3768
Årgang
105
Hefte nr.
5-6
Side(r)
2415 - 2429