Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites
Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites
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DOI：
10.1021/acsapm.2c00737
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发表时间：
2022-06
影响因子：
5
通讯作者：
Wencai Li;G. Palardy
中科院分区：
文献类型：
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作者：
Wencai Li;G. Palardy
在这项工作中，玻璃纤维/聚丙烯被粘物超声焊接与多功能纳米复合聚合物膜含有多壁碳纳米管（MWCNTs），嵌入在界面处。通过电阻变化评估了两种不同接头配置在弯曲载荷下的应变和损伤监测潜力。首先对焊接单搭接接头进行不同间隔时间的循环弯曲试验，以分析不同MWCNT重量含量（5重量%至20重量%）的稳定性。随后，3点弯曲接头（3 PBJ）焊接与单，双膜配置，然后进行静态和循环加载，以评估监测能力，通过机电响应。与纳米复合膜焊接的3 PBJ导致弯曲强度增加20.6%。单膜3 PBJs显示出稳定的电阻增加，但没有捕获对应于试样中损伤起始的负载变化。预裂纹单膜焊缝和双膜焊缝在焊接界面处经历裂纹扩展，通过光学显微镜确认，这导致电阻曲线的相应变化高达300%。双膜焊接在低循环弯曲载荷下进行测试，这转化为纳米复合材料膜在张力下电阻的循环变化。总体而言，所提出的纳米复合材料薄膜显示出在热塑性复合材料接头界面处实现超声波焊接和集成传感的潜力。
In this work, glass fiber/polypropylene adherends were ultrasonically welded with multifunctional nanocomposite polymer films containing multi-walled carbon nanotubes (MWCNTs), embedded at the interface. Their potential for strain and damage monitoring under flexural loading for two different joint configurations was assessed via electrical resistance changes. Cyclic bending tests at various interval durations were first performed on welded single-lap joints to analyze the stability of different MWCNT weight contents (5 wt % to 20 wt %). Subsequently, 3-point bending joints (3PBJs) were welded with single- and double-film configurations and then subjected to static and cyclic loading to assess the monitoring capability through electro-mechanical responses. The 3PBJs welded with nanocomposite films led to an increase in flexural strength by 20.6%. Single-film 3PBJs showed a stable increase in resistance, but load changes corresponding to damage initiation in the specimen were not captured. Pre-cracked single-film welds and double-film welds experienced crack propagation at the welded interface, confirmed through optical microscopy, which resulted in corresponding changes in the resistance curves by up to 300%. Double-film welds were tested under low cyclic flexural loading, which translated into cyclic changes in electrical resistance for the nanocomposite film under tension. Overall, the proposed nanocomposite films show potential to enable ultrasonic welding and integrated sensing at the interface of thermoplastic composite joints.