红外热成像结合三维扫描评估船上打印PETG部件：壁厚1至2毫米试件稳态加热下尺寸变化轻微，《科学报告》11月14日刊出
《科学报告》11月14日刊出一项增材制造研究，评估熔融沉积成型打印的 PETG 部件在船上环境中的热与几何稳定性。这类部件被设想为船上快速制造的临时备件，用于短期服役。
研究首先制备壁厚 1 至 2 毫米的圆柱形 PETG 管状试件，采用不同的层高与打印速度打印，随后在稳态加热条件下评估。分析手段为被动红外热成像，并结合加热前后的三维扫描比对。
随后，研究团队逆向复制了一件船上管道系统使用的法兰三通连接件 PETG 复制品，在相同热条件下测试。红外热成像显示，与垂直加热布置相关的温度梯度处于中等水平；三维偏差图显示尺寸变化轻微，与管状试件的结果相近。
实验同时提示，快速热加载与热机械加载可能导致打印试件出现层间分离；层间分离是通过试验后的目视检查发现的，红外热成像则提供试件的温度分布信息。
论文结论称，在稳态加热条件下，受试试件表现出稳定的热与几何行为，仅有轻微尺寸偏差；采用省时工艺参数打印的 PETG 部件有可能在稳态热条件下用作临时部件，被动红外热成像可作为监测增材制造聚合物部件温度分布的实用工具。
图中是多卷三维打印线材与各色打印成品
Infrared Thermography With 3D Scanning Assesses Shipboard-Printed PETG Parts With 1 to 2 mm Walls Showing Minor Dimensional Change, Scientific Reports, November 14
Scientific Reports published an additive manufacturing study on November 14 assessing the thermo-geometric stability of FDM-printed PETG components intended for shipboard use. Such parts are envisioned as rapidly fabricated temporary spare parts for short-term service on board ships.
The researchers first manufactured cylindrical PETG pipe specimens with wall thicknesses ranging from 1 to 2 millimetres, using different layer heights and printing speeds, and evaluated them under steady heating. Analysis used passive infrared thermography combined with pre- and post-heating 3D scanning.
Next, a reverse-engineered PETG replica of a flanged tee connector used in shipboard piping systems was fabricated and tested under the same thermal conditions. Infrared thermography revealed moderate temperature gradients associated with the vertical heating configuration, while 3D deviation maps indicated only minor dimensional changes, comparable to those of the pipe specimens.
The experiments also suggested that rapid thermal and thermo-mechanical loading may lead to layer separation in printed specimens. Delamination was identified through post-test visual inspection, while infrared thermography provided information on the thermal response of the specimens.
The paper concluded that under steady heating conditions the specimens exhibited stable thermal and geometric behavior with only minor dimensional deviations, suggesting that PETG parts printed with time-efficient process parameters may have potential as temporary components under steady-state thermal conditions, and that passive infrared thermography can be a practical monitoring tool.
来源：《科学报告》
发布：GSM·美国（发布链接）
图片来源：图：多卷三维打印线材与各色打印成品。作者：Maurizio Pesce，CC BY 2.0，维基共享资源。 / Photo: Spools of 3D printing filament and printed objects. Credit: Maurizio Pesce, CC BY 2.0, via Wikimedia Commons.
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