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首页> 外文期刊>International journal of mechanics and materials in design >Numerical and experimental analysis of the structural performance of AM components built by fused filament fabrication
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Numerical and experimental analysis of the structural performance of AM components built by fused filament fabrication

机译：熔丝丝制造构造的AM组件结构性能的数值和实验分析

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摘要

This work analyses the performance of parts built by Additive Manufacturing (AM) using fused filament fabrication (FFF) demonstrating the correlation between the printing orientation and structural performance. FFF components present two regions showing different mechanical behaviour: the external contour and the inner structure (in-fills or lattice). The respective mechanical properties of the contour and the inner structure are obtained. In this work the inner structure is replaced by an anisotropic homogenized material. A Representative Volume Element with Periodic Boundary conditions is adopted to obtain the corresponding equivalent constitutive tensor. On the other hand, the contour is considered isotropic. The material characterization of both the in-fill and the contour is done following two complementary strategies: (1) an experimental campaign involving several tensile tests on FFF specimens; (2) a sensitivity analysis through numerical modelling. Performing experiments to obtain the material properties for contour and in-fill may be a challenging task. Thus, the numerical modelling and the optimization technique are used to obtain the material properties as a function of the filament properties. Calibration of the structural response of 3D-printed demonstrators under bending and torsion is done in order to optimize the material parameters of the numerical model by minimising the difference between the experimental and numerically computed structural stiffness. It is shown that assuming isotropic behaviour for the contour results in a negligible error. The AM software so calibrated can be used for analysing the mechanical performance of FFF components and selecting the optimal printing orientation as well as the contour thickness and in-fill density to satisfy the structural performance required.
机译：这项工作分析了使用熔融灯具制造（FFF）构建的附加制造（AM）构建的零件的性能，证明了印刷方向与结构性能之间的相关性。 FFF组件存在显示不同机械行为的两个区域：外部轮廓和内部结构（填充或晶格）。获得轮廓的各自的机械性能和内部结构。在这项工作中，内部结构由各向异性均质材料代替。采用具有周期性边界条件的代表性体积元素来获得相应的等效本构张解量。另一方面，轮廓被认为是各向同性的。填充和轮廓的材料表征在两个互补策略之后进行：（1）一种涉及在FFF标本上的几种拉伸试验的实验运动; （2）通过数值建模的敏感性分析。执行实验以获得轮廓和填充物的材料特性可能是一个具有挑战性的任务。因此，使用数值建模和优化技术来获得作为丝特性的函数的材料特性。在弯曲和扭转下校准3D印刷示威者的结构响应，以通过最小化实验和数值计算结构刚度之间的差异来优化数值模型的材料参数。结果表明，假设轮廓的各向同性行为导致误差可忽略不计。如此校准的AM软件可用于分析FFF组件的机械性能，并选择最佳打印方向以及轮廓厚度和填充密度，以满足所需的结构性能。

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