4.6 Article

A Study on Through-the-Thickness Heating in Continuous Ultrasonic Welding of Thermoplastic Composites

期刊

MATERIALS
卷 14, 期 21, 页码 -

出版社

MDPI
DOI: 10.3390/ma14216620

关键词

fusion bonding; heat transfer; high-frequency welding; joining; CF/PPS; energy director

资金

  1. European research programme Clean Sky
  2. European Union [GAM AIR 2020-945521]

向作者/读者索取更多资源

The study found that higher through-the-thickness heating in continuous ultrasonic welding is mainly caused by viscoelastic bulk heat generation, rather than thermal conduction. Interestingly, most of the vibrational energy is absorbed by the top adherend in the continuous process, in contrast to a more balanced energy share between the top and bottom adherend in the static process.
Continuous ultrasonic welding is a promising technique for joining thermoplastic composites structures together. The aim of this study was to gain further insight into what causes higher through-the-thickness heating in continuous ultrasonic welding of thermoplastic composites as compared to the static process. Thermocouples were used to measure temperature evolutions at the welding interface and within the adherends. To understand the mechanisms causing the observed temperature behaviours, the results were compared to temperature measurements from an equivalent static welding process and to the predictions from a simplified heat transfer model. Despite the significantly higher temperatures measured at the welding interface for the continuous process, viscoelastic bulk heat generation and not thermal conduction from the interface was identified as the main cause of higher through-the-thickness heating in the top adherend. Interestingly the top adherend seemed to absorb most of the vibrational energy in the continuous process as opposed to a more balanced energy share between the top and bottom adherend in the static process. Finally, the higher temperatures at the welding interface in continuous ultrasonic welding were attributed to pre-heating of the energy director due to the vibrations being transmitted downstream of the sonotrode, to reduced squeeze-flow of energy director due to the larger adherend size, and to heat flux originating downstream as the welding process continues.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据