中国塑料 ›› 2022, Vol. 36 ›› Issue (5): 29-35.DOI: 10.19491/j.issn.1001-9278.2022.05.006

• 材料与性能 • 上一篇    下一篇

熔融沉积工艺参数对热塑性聚氨酯弹性体静动态力学性能的影响

雷经发1,2, 沈强1, 刘涛1,2(), 孙虹1,2, 尹志强1   

  1. 1.安徽建筑大学机械与电气工程学院,合肥 230601
    2.工程机械智能制造安徽省教育厅重点实验室,合肥 230601
  • 收稿日期:2022-02-07 出版日期:2022-05-26 发布日期:2022-05-26
  • 通讯作者: 刘涛(1984—),男,副教授,从事材料静动态力学性能测试研究,tao.liu@ahjzu.edu.cn
    E-mail:tao.liu@ahjzu.edu.cn
  • 基金资助:
    合肥市自然科学基金项目(2021019);安徽高校自然科学研究重大项目(KJ2021ZD0068);安徽省教育厅高校优秀拔尖人才培育项目(gxbjZD2020078)

Influence of fused deposition process parameters on static and dynamic mechanical properties of thermoplastic polyurethane elastomer

LEI Jingfa1,2, SHEN Qiang1, LIU Tao1,2(), SUN Hong1,2, YIN Zhiqiang1   

  1. 1.School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China
    2.Anhui Key Laboratory of Intelligent Manufacturing of Construction Machinery,Hefei 230601,China
  • Received:2022-02-07 Online:2022-05-26 Published:2022-05-26
  • Contact: LIU Tao E-mail:tao.liu@ahjzu.edu.cn

摘要:

为揭示通过熔融沉积成型(FDM)工艺制备的热塑性聚氨酯弹性体(TPU)的静动态力学性能及工艺参数对其力学性能的影响,采用万能材料试验机和分离式霍普金森压杆(SHPB)实验装置对使用3种打印速率(10、40、70 mm/s)和3种喷头温度(200、220、240 ℃)制备的TPU开展准静态(0.01 s-1)和动态(1 000 s-1)加载下的力学性能试验,并进行工艺参数优选,同时进一步获取了材料在较宽应变率范围(0.001~2 500 s-1)的应力?应变样本空间数据。结果表明,准静态和动态加载下,喷头温度220 ℃、打印速率40 mm/s为最优工艺参数;试样在准静态和动态下均具有应变率效应;准静态下试样超弹性特征显著,动态下结合朱?王?唐(ZWT)方程构建的材料黏弹性本构模型拟合曲线与实验曲线吻合较好;采用最优工艺参数制备的试样出现明显“微相分离”现象。

关键词: 热塑性聚氨酯弹性体, 熔融沉积成型, 分离式霍普金森压杆, 应变率

Abstract:

To explore the static and dynamic mechanical properties of thermoplastic polyurethane elastomer prepared through the fused deposition modeling process as well as the influence of process parameters on the mechanical properties, the mechanical properties of thermoplastic polyurethane elastomer under a quasi?static loading of 0.01 s-1 and a dynamic loading of 1 000 s-1 were evaluated at three printing speeds of 10, 40 and 70 mm/s and three nozzle temperatures of 200, 220, and 240 °C using a universal material testing machine and a split Hopkinson pressure bar (SHPB) experimental apparatus. The process parameters were also optimized. Furthermore, the stress?strain sample space data were further obtained in a wide strain?rate range of 0.001~2 500 s-1. The results indicated that a nozzle temperature of 220 °C and a printing speed of 40 mm/s were the optimal process parameters under the quasi?static and dynamic loadings. The specimens had a strain?rate effect under both the quasi?static and the dynamic conditions, exhibiting significant hyper?elastic characteristics under the quasi?static condition. Using a viscoelastic constitutive model of the material combined with the ZWT (Zhu?Wang?Tang) equation under the dynamic condition, the fitted curves of the model were in good agreement with the experimental curves. The specimens showed an obvious "micro?phase separation" under the optimal process parameters.

Key words: thermoplastic polyurethane elastomer, fused deposition modeling, split Hopkinson pressure bar, strain rate

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