Fused deposition modelling (FDM) is the most common additive manufacturing technology used for thermoplastic components. This layers-based manufacturing process results into direct links between printing parameters and the polymer mesostructure by means of porosity and structural anisotropy. These dependencies along with other features of thermoplastic polymers (i.e., nonlinearities, viscous and thermal responses) makes its constitutive modelling very challenging. This work distances to studies that model the 3D printing process. Instead, we aim at complementing such approaches with a continuum model to describe the macroscopic behaviour of FDM thermoplastics while preserving links with printing parameters. Prior to the modelling conceptualisation, experimental characterisation tests are conducted on ABS specimens to evaluate the influence of printing parameters on the macroscopic mechanical response. The physical fundamentals behind the deformation and failure mechanisms are identified and motivate the new constitutive model. This model is formulated for finite deformations within a thermodynamically consistent framework. The model accounts for: nonlinear response; anisotropic hyperelasticity related to a transversely isotropic distribution of porous; strain rate dependency; macroscopic stiffness dependent on 3D printing processing. Finally, the model is numerically implemented and calibrated for ABS with original experiments, demonstrating its suitability.

熔融沉积建模（FDM）是用于热塑性部件的最常见的增材制造技术。这种基于层的制造过程通过孔隙率和结构各向异性导致了印刷参数与聚合物介观结构之间的直接联系。这些依赖性以及热塑性聚合物的其他特征（即非线性，粘性和热响应）使其本构模型非常具有挑战性。这项工作与为3D打印过程建模的研究相距甚远。相反，我们旨在通过连续模型来补充此类方法，以描述FDM热塑性塑料的宏观行为，同时保留与打印参数的联系。在建模概念化之前，在ABS样品上进行了实验表征测试，以评估印刷参数对宏观机械响应的影响。识别变形和破坏机制背后的物理基础，并激发新的本构模型。该模型适用于热力学一致框架内的有限变形。该模型说明：非线性响应；与多孔材料的横观各向同性分布有关的各向异性超弹性；应变率依赖性 宏观刚度取决于3D打印处理。最后，通过原始实验对该模型进行了数值实现和校准，证明了其适用性。识别变形和破坏机制背后的物理基础，并激发新的本构模型。该模型适用于热力学一致框架内的有限变形。该模型说明：非线性响应；与多孔材料的横观各向同性分布有关的各向异性超弹性；应变率依赖性 宏观刚度取决于3D打印处理。最后，通过原始实验对该模型进行了数值实现和校准，证明了其适用性。识别变形和破坏机制背后的物理基础，并激发新的本构模型。该模型适用于热力学一致框架内的有限变形。该模型说明：非线性响应；与多孔材料的横观各向同性分布有关的各向异性超弹性；应变率依赖性 宏观刚度取决于3D打印处理。最后，通过原始实验对该模型进行了数值实现和校准，证明了其适用性。应变率依赖性 宏观刚度取决于3D打印处理。最后，通过原始实验对该模型进行了数值实现和校准，证明了其适用性。应变率依赖性 宏观刚度取决于3D打印处理。最后，通过原始实验对该模型进行了数值实现和校准，证明了其适用性。