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Modeling the temperature, crystallization, and residual stress for selective laser sintering of polymeric powder

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Abstract

A thermomechanical model is developed to predict the temperature, degree of crystallization, residual stress, and strain in the selective laser sintering process for polymeric powder. Especially, a transient heat transfer model is used to calculate the temperature evolution. An elastic–viscoplastic model is developed to describe the temperature- and time-dependent stress–strain behavior of polymeric materials with crystallization-induced strain being included. A crystallization model is used to predict the relative crystallization degree during the cooling process. The sintering process and cooling process of polyamide 12 are simulated using the developed model. The melt pool depth and the deformation of the printed parts are validated by the experimental results. The evolutions of the temperature, relative degree of crystallization, strain, and stress are evaluated. The effects of the cooling rate on the strain and stress evolutions are discussed.

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 12002234), the research start-up foundation of Tianjin University (0903061122), and the opening project of Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin University.

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Authors and Affiliations

  1. Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin, 300350, China

    Fei Shen & Liao-Liang Ke

  2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Wei Zhu & Kun Zhou

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  1. Fei Shen
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Correspondence to Fei Shen.

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Shen, F., Zhu, W., Zhou, K. et al. Modeling the temperature, crystallization, and residual stress for selective laser sintering of polymeric powder. Acta Mech 232, 3635–3653 (2021). https://doi.org/10.1007/s00707-021-03020-6

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  • DOI: https://doi.org/10.1007/s00707-021-03020-6

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