首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >The elasto-plastic analysis of 3D-printed thermoplastics using the NNRPIM and a modified hill yield criterion
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The elasto-plastic analysis of 3D-printed thermoplastics using the NNRPIM and a modified hill yield criterion

机译:使用NNRPIM的3D印刷热塑性塑料的弹性塑性分析和改进的山丘收益率标准

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摘要

The Fused Filament Fabrication is a 3D printing technology that allows the production of components and structures with complex geometries at low-cost, using thermoplastic materials as feedstock. This additive manufacturing technique is not yet extensively used in industries mainly due to parts’ anisotropy – which is the consequence of the deposition strategy – and residual stresses, caused by successive heating cycles. Thus, these topics have great influence on the non-linear mechanical performance of 3D printed parts. Additionally, the materials used in the Fused Filament Fabrication have distinct mechanical behaviours under tensile and compression loads. This work proposes a computational framework – using a meshless method as the numeric discretization technique, the Natural Neighbour Radial Point Interpolation method – capable to analyse the elastoplastic response of ductile materials showing distinct compressive and tensile responses, through the implementation of a modified version of the Hill yield surface. In those conditions, 3D-printed specimens of polylactic acid are tested experimentally and numerically using standard tensile and compression tests. The numerical approach is validated by comparing the numerical and the experimental curves. Then, the accuracy of the methodology is proved and the purpose of using the modified Hill yield criterion is clearly shown using a benchmark example.
机译:熔丝灯丝制造是3D打印技术,其允许在低成本中使用热塑性材料作为原料生产成分和结构,以低成本。这种添加剂制造技术尚未广泛地在行业中使用,主要是由于零件的各向异性 - 这是由连续加热循环引起的沉积策略 - 和残余应力的结果。因此,这些主题对3D印刷部件的非线性机械性能产生了很大影响。另外,在熔融灯丝制造中使用的材料在拉伸和压缩负载下具有不同的机械行为。这项工作提出了一种计算框架 - 使用无网格方法作为数值离散化技术,天然邻径点插值方法 - 能够分析延展性材料的弹性塑料响应,其通过实施修改版本的实施方式山屈服表面。在这些条件下,使用标准拉伸和压缩试验在实验和数值上进行测试的3D印刷标本。通过比较数值和实验曲线来验证数值方法。然后,证明了方法的准确性,使用基准示例清楚地示出了使用改进的山率标准的目的。

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