Numerical modeling and experimental verification of the composite material of PA12/HA with parameterized random distribution in selective laser sintering
Numerical modeling and experimental verification of the composite material of PA12/HA with parameterized random distribution in selective laser sintering
复制标题
参数化随机分布PA12/HA复合材料选择性激光烧结数值模拟与实验验证
DOI：
10.1108/rpj-04-2021-0102
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
鄢然
中科院分区：
文献类型：
--
作者：
李军超;杨亚男;赵泽;鄢然
目的
为了考虑材料的各向异性，建立了尼龙12/羟基磷灰石(PA12/HA)复合材料在选择性激光烧结(SLS)过程中的随机分布有限元模型，得到了PA12/HA烧结过程中温度和应力的变化规律。
设计/方法/方法
利用ABAQUS中的PYTHON脚本，建立了两种材料随机分布的有限元模型，并赋予了两种材料与温度相关的固有物理参数。通过数值模拟和扫描电子显微镜分析，对不同工艺参数下的熔池尺寸进行了评估，两者吻合较好。并对不同HA含量条件下的温度和应力分布进行了评价。
发现
结果表明，HA粉末的不均匀分布和数量对应力集中和温度升高起着至关重要的作用。此外，HA的加入对SLS制件力学性能的影响表明，HA含量小于5%时，有利于提高抗压强度，因为过量的HA粉末容易产生一定数量的微孔，导致零件密度降低。
原创性/价值
PA12/HA复合材料SLS中参数随机分布的有限元模型可应用于其他类似的添加剂制造工艺。为复合材料性能的数值分析提供了可行的指导。
Purpose
The purpose of this study is to establish a finite element (FE) model with the random distribution of the Nylon12/hydroxyapatite (PA12/HA) composite material in selective laser sintering (SLS) process for considering the material anisotropy, which aims to obtain the law of temperature and stress changes in PA12/HA sintering.
Design/methodology/approach
By using python script in Abaqus, the FE model is established in which the two materials are randomly distributed and are assigned to their intrinsic temperature-dependent physical parameters. Molten pool sizes at various process parameters were evaluated in terms of numerical simulation and scanning electron microscope analysis, identifying a good agreement between them. Evaluation of temperature and stress distribution under the condition of different HA contents was also conducted.
Findings
It shows that the uneven distribution and quantity of HA powder play a vital role in stress concentration and temperature increase. Additionally, the influence of HA addition on the mechanical performance of SLS-fabricated parts shows that it is conducive to improve compressive strength when the HA ratio is less than 5% because an excess of HA powder tends to bring about a certain amount of microspores resulting in a decrease in part density.
Originality/value
The FE model of the PA12/HA composite material with parameterized random distribution in SLS can be applied in other similar additive manufacturing technologies. It provides a feasible guideline for the numerical analysis of properties of composite materials.
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影响因子：
3.2
作者：
Bai, Jiaming;Goodridge, Ruth D.;Song, Mo
通讯作者：
Song, Mo
影响因子：
6.3
作者：
Fei Shen;Shangqin Yuan;C. Chua;K. Zhou
通讯作者：
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DOI：
10.1016/j.ijmachtools.2003.10.019
发表时间：
2004-02-01
影响因子：
14
作者：
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通讯作者：
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影响因子：
14
作者：
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通讯作者：
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影响因子：
9.7
作者：
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通讯作者：
Yangyiwei Yang;Olav Ragnvaldsen;Yang Bai;M. Yi;Bai-Xiang Xu