基于横向各向同性行为的材料本构模型在预测多射流熔融打印聚酰胺12零件力学性能方面的适用性。

Applicability of a Material Constitutive Model Based on a Transversely Isotropic Behaviour for the Prediction of the Mechanical Performance of Multi Jet Fusion Printed Polyamide 12 Parts.

作者信息

Perez-Barcenilla Sergio, Cearsolo Xabier, Aramburu Amaia, Castano-Alvarez Ruben, Castillo Juan R, Gayoso Lopez Jorge

机构信息

TECNALIA, Basque Research and Technology Alliance (BRTA), Astondo Bidea, Edificio 700, 48160 Derio, Spain.

IMH Campus, Azkue Auzoa 1, 20870 Elgoibar, Spain.

出版信息

Polymers (Basel). 2023 Dec 23;16(1):56. doi: 10.3390/polym16010056.

DOI:10.3390/polym16010056

PMID:38201721

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10780423/

Abstract

Multi Jet Fusion (MJF), an innovative additive manufacturing (AM) technique in the field of Powder Bed Fusion (PBF) developed by Hewlett-Packard (HP) Inc. (Palo Alto, CA, USA), has been designed to produce polymer parts using thermoplastic-based powders, primarily focusing on polyamide 12 (PA12). Employing a layer-by-layer approach, MJF enables the rapid production of intricate components, reportedly up to 10 times faster than other AM processes. While the mechanical properties of MJF-printed PA12 and the impact of build orientation on those properties have already been explored in various studies, less attention has been given to the mechanical performance of MJF-printed PA12 components under complex loads and accurate predictive models. This contribution aims to assess the applicability of a constitutive model based on a transversely isotropic behaviour under linear elastic deformation for predicting the mechanical response of MJF-printed PA12 parts through numerical simulations. Both uniaxial tensile and shear tests were carried out on printed samples to determine the elastic properties of MJF-printed PA12, with additional testing on printed complex handle-shaped parts. Finally, a numerical model was developed to simulate the mechanical tests of the handles. Results from tests on printed samples showed that MJF-printed PA12, to some extent, behaves as a transversely isotropic material. Furthermore, using a constitutive model that assumes a transversely isotropic behaviour under linear elastic deformation for predicting the mechanical response of MJF-printed PA12 parts in numerical simulations could be a reasonable approach, provided that the material stress levels remain within the linear range. However, the particularities of the stress-strain curve of MJF-printed PA12 complicate determining the elasticity-to-plasticity transition point.

摘要

多射流熔融（MJF）是由美国加利福尼亚州帕洛阿尔托的惠普公司开发的粉末床熔融（PBF）领域的一种创新增材制造（AM）技术，旨在使用热塑性基粉末生产聚合物零件，主要聚焦于聚酰胺12（PA12）。MJF采用逐层方法，能够快速生产复杂部件，据报道其速度比其他增材制造工艺快达10倍。虽然在各种研究中已经探讨了MJF打印的PA12的机械性能以及构建方向对这些性能的影响，但对于MJF打印的PA12部件在复杂载荷下的机械性能和精确预测模型关注较少。本论文旨在评估基于线性弹性变形下横向各向同性行为的本构模型通过数值模拟预测MJF打印的PA12零件机械响应的适用性。对打印样品进行了单轴拉伸和剪切试验，以确定MJF打印的PA12的弹性性能，并对打印的复杂手柄形状零件进行了额外测试。最后，开发了一个数值模型来模拟手柄的机械试验。打印样品的测试结果表明，MJF打印的PA12在一定程度上表现为横向各向同性材料。此外，在数值模拟中使用假设线性弹性变形下横向各向同性行为的本构模型来预测MJF打印的PA12零件的机械响应可能是一种合理的方法，前提是材料应力水平保持在线性范围内。然而，MJF打印的PA12的应力 - 应变曲线的特殊性使得确定弹性 - 塑性转变点变得复杂。