Graphical '/> Process prediction of selective laser sintering based on heat transfer analysis for polyamide composite powders
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Process prediction of selective laser sintering based on heat transfer analysis for polyamide composite powders

机译：基于传热分析的聚酰胺复合粉末选择性激光烧结工艺预测

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Graphical abstractDisplay OmittedHighlights•A modified numerical model concerning the heat transfer analysis of selective laser sintering process was proposed.•Heat transfer in different polyamide composite powders showed a big difference.•The relationship between the laser-powder bed interaction and sintering process planning of composites was firstly discussed.•The experimental investigation became more efficient duo to the process prediction.AbstractWith the increasing research into selective laser sintering of composite powders, a modified numerical model was introduced to provide appropriate process predictions for the production of different functional composites. This numerical method included an effective volumetric heat source model and an integrated testing procedure, in which the differences of polyamide/carbon fiber (PA/CF) and PA/NaCl composite powders in thermo-physical and optical properties were studied. The unknown variables in the numerical model were all determined by experiments. The simulated temperature distributions of different powder beds exhibited a big difference in the melting depth. Entirely different processing parameters were planned for the two composites according to their simulation results. In the following experiments, highly porous PA derived from PA/NaCl composites had a maximum porosity of 59%. Compared with pure PA, CF reinforced PA showed a dramatic increase of the flexural strength and modulus by a factor of 100% and 380%, respectively. Therefore, the design objectives of two PA composites were both well accomplished. In addition, the experimental investigation became more efficient due to the process prediction. The accuracy of the model was validated by the microstructures of PA/CF and PA/NaCl, which meant this method could be used to provide appropriate process planning for more composites.
机译： 图形摘要 省略显示 突出显示 • 提出了一种有关选择性激光烧结过程传热分析的改进数值模型。 • 不同聚酰胺中的传热复合粉末显示出很大的差异。 • 首先讨论了激光粉末床相互作用与复合材料烧结工艺计划之间的关系。 • 对于过程预测，实验研究变得更加有效。 摘要 随着对复合粉末选择性激光烧结的研究越来越多，引入了改进的数值模型以提供适当的工艺预测用于生产不同功能的复合材料。该数值方法包括有效的体积热源模型和综合测试程序，其中研究了聚酰胺/碳纤维（PA / CF）和PA / NaCl复合粉末在热物理和光学性质方面的差异。数值模型中的未知变量全部由实验确定。不同粉末床的模拟温度分布在熔化深度上存在很大差异。根据两种复合材料的模拟结果，计划了完全不同的加工参数。在以下实验中，衍生自PA / NaCl复合材料的高孔隙度PA的最大孔隙率为59％。与纯PA相比，CF增强PA的弯曲强度和模量分别显着增加了100％和380％。因此，两种PA复合材料的设计目标都可以很好地实现。另外，由于过程预测，实验研究变得更加有效。 PA / CF和PA / NaCl的微观结构验证了该模型的准确性，这意味着该方法可用于为更多复合材料提供适当的工艺计划。

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