论文标题
MWCNT/PP膜的机械和电气特性以及GF/PP关节的结构健康监测
Mechanical and electrical properties of MWCNT/PP films and structural health monitoring of GF/PP joints
论文作者
论文摘要
虽然热塑性复合材料（TPC）的焊接是减轻体重的一种有希望的无关紧要的方法，但必须实现对关节的结构完整性和失败预测的更高信心，以在行业中广泛使用。在这项工作中，我们介绍了一项有关具有多壁碳纳米管（MWCNT）和嵌入式Buckypaper膜的超声焊接TPC接头损伤检测的创新研究。 MWCNT显示了复合关节的结构健康监测（SHM）的希望，通过粘合键或融合键组装，通过电阻变化组装。这项研究重点是研究多功能膜及其对TPC超声焊接（USW）的适用性，使用两种方法：1）MWCNT/填充聚丙烯（PP）纳米复合材料通过溶剂分散剂制备，而2）高电导率mwcnt buckypaper empertive mwcnt buckypaper胚胎胚胎在PP膜之间通过热式加工来进行。使用溶剂分散法合成了含有5 wt和10 wt MWCNT的纳米复合材料，然后将压缩成型用于制造膜。使用先前的研究基于先前的研究，对MWCNT浓度对多功能膜的电和动态机械行为的影响进行了检查，并在5至20 wt MWCNT-PP的膜之间进行了比较。使用BuckyPaper和MWCNT/PP膜在单圈剪切构中对玻璃纤维/聚丙烯（GF/PP）复合接头进行超声焊接。此外，在弯曲载荷下对接头进行了电阻测量。据观察，比嵌入的Buckyppaper和MWCNT含量较低的膜具有更高的稳定性和对电阻反应的敏感性，其稳定性和敏感性更高，这表明它们适合USW且对SHM的潜力。
While welding of thermoplastic composites (TPCs) is a promising rivetless method to reduce weight, higher confidence in joints' structural integrity and failure prediction must be achieved for widespread use in industry. In this work, we present an innovative study on damage detection for ultrasonically welded TPC joints with multiwalled carbon nanotubes (MWCNTs) and embedded buckypaper films. MWCNTs show promise for structural health monitoring (SHM) of composite joints, assembled by adhesive bonding or fusion bonding, through electrical resistance changes. This study focuses on investigating multifunctional films and their suitability for ultrasonic welding (USW) of TPCs, using two approaches: 1) MWCNT/filled polypropylene (PP) nanocomposites prepared via solvent dispersion, and 2) high conductivity MWCNT buckypaper embedded between PP films by hot pressing. Nanocomposite formulations containing 5 wt and 10 wt MWCNTs were synthesized using solvent dispersion method, followed by compression molding to manufacture films. The effect of MWCNT concentration on electrical and dynamic mechanical behavior of multifunctional films was examined with a Sourcemeter and Dynamic Mechanical Analyzer, and a comparison was made between 5 to 20 wt MWCNT-PP films based on previous research. Glass fiber/polypropylene (GF/PP) composite joints were ultrasonically welded in a single lap shear configuration using buckypaper and MWCNT/PP films. Furthermore, electrical resistance measurements were carried out for joints under bending loads. It was observed that 15 wt and 20 wt MWCNT/PP films had higher stability and sensitivity for resistance response than embedded buckypaper and films with low MWCNT contents, demonstrating their suitability for USW and potential for SHM.
