Bertocco Alcide, Bruno Matteo, Armentani Enrico, Esposito Luca, Perrella Michele
Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy.
Materials (Basel). 2022 May 13;15(10):3509. doi: 10.3390/ma15103509.
In this work, the stress relaxation behavior of 3D printed PLA was experimentally investigated and analytically modeled. First, a quasi-static tensile characterization of additively manufactured samples was conducted by considering the effect of printing parameters like the material infill orientation and the outer wall presence. The effect of two thermal conditioning treatments on the material tensile properties was also investigated. Successively, stress relaxation tests were conducted, on both treated and unconditioned specimens, undergoing three different strains levels. Analytical predictive models of the viscous behavior of additive manufactured material were compared, highlighting and discussing the effects of considered printing parameters.
在这项工作中，对3D打印聚乳酸（PLA）的应力松弛行为进行了实验研究和分析建模。首先，通过考虑诸如材料填充方向和外壁存在等打印参数的影响，对增材制造的样品进行了准静态拉伸表征。还研究了两种热调节处理对材料拉伸性能的影响。随后，对经过处理和未处理的试样进行了应力松弛测试，测试了三种不同的应变水平。比较了增材制造材料粘性行为的分析预测模型，突出并讨论了所考虑的打印参数的影响。
