沉积模型过程参数对超弹性热塑性聚氨构成模型的影响
Lucas Gallup1, Mohamed Trabia1, Brendan O'Toole1
1Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154, USA.
Polymers
|January 11, 2025
概括
本研究确定了使用化沉积建模 (FDM) 制造的热塑性聚氨 (TPU) 部件的精确超弹性构成模型. 第三阶段的穆尼-里夫林模型有效地预测了在巨大的应变下TPU部件的变形.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 增材制造 增材制造 增材制造
背景情况:
- 热塑性聚氨 (TPU) 在沉积建模 (FDM) 中用于灵活和坚固的部件.
- 预测FDM打印TPU零件的变形是具有挑战性的,因为过程依赖的构成模型.
- 缺乏确定的构成模型阻碍了FDM TPU组件的准确模拟.
研究的目的:
- 为了确定FDM打印的TPU零件的精确超弹性构成模型.
- 研究印刷参数对TPU材料行为的影响.
- 为了使TPU组件在较大的变形下进行可靠的有限元素分析 (FEA).
主要方法:
- 使用FDM生产了六组单轴拉伸样本,具有不同的灌装几何形状 (仅墙壁而不是±45°灌装) 和挤出喷嘴温度.
- 确定了每个样本组最适合的超弹性构成模型.
- 通过实验测试的有限元分析 (FEA) 验证了模型.
主要成果:
- 第三阶的穆尼-里夫林构成模型准确地描述了所有测试的FDM TPU标本的行为.
- 使用拟议模型进行的FEA模拟在所有实验组中显示出有限的错误.
- 该研究成功验证了模型对大变形的预测能力.
结论:
- 第三级Mooney-Rivlin模型为FDM打印的TPU提供了准确的构成代表.
- 开发的模型提高了FEA中TPU零件变形的可预测性.
- 这项工作弥合了对工程应用的FDM TPU行为理解和建模的差距.
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