Detection of Delamination in GFRP Laminates Using Electromagnetic Acoustic Transducers

使用电磁声换能器检测 GFRP 层压板的分层

• 批准号: 14550084
• 负责人: YAMASAKI Tomohiro
• 金额: $ 2.11万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550084/
• 关键词: GFRP; Delamination; Nondestructive inspection; Lamb wave; Electromagnetic acoustic transducer; Damage evaluation

Electromagnetic acoustic transducers(EMATs) were applied to detection of delamination in glass fiber reinforced plastic(GFRP) laminates. Since velocity of Lamb wave shows the dependence on the plate thickness, we proposed to evaluate the delamination by detecting the fractional change in the Lamb wave velocity. The EMATs, each of which consists of a coil embedded in the laminate and a permanent magnet put on the laminate, were used to launch and receive the Lamb wave. We measured both phase and group velocities.In the group velocity measurement, short pulse excited the transmitter EMAT. Then, the amplitude of the center frequency component of the received signal was calculated in the time domain. Time of the peak amplitude was plotted against the path length, and we could evaluate the delaminated section as the region of the slightly lowered slope. We found that the position of the Delamination front can be evaluated with an accuracy of 10mm in the 12 ply laminate.In order to measure the phase velocity, we used the meander line coil EMAT. When the half wavelength of the Lamb wave coincides with the coil pitch, the amplitude of the received signal takes the maximum value. We revealed that the delamination at the receiving position can be detected successfully in the 32 ply laminate.

电磁声换能器（EMAT）用于检测玻璃纤维增​​强塑料（GFRP）层压板的分层。由于兰姆波速度显示出对板厚度的依赖性，因此我们建议通过检测兰姆波速度的分数变化来评估分层。每个 EMAT 都由嵌入层压板中的线圈和放置在层压板上的永磁体组成，用于发射和接收兰姆波。我们测量了相速度和群速度。在群速度测量中，短脉冲激发发射器 EMAT。然后，在时域中计算接收信号的中心频率分量的幅度。峰值振幅的时间相对于路径长度进行绘制，我们可以将分层部分评估为稍微降低的斜率区域。我们发现，在 12 层板中，分层前沿的位置可以以 10mm 的精度进行评估。为了测量相速度，我们使用了曲折线线圈 EMAT。当兰姆波的半波长与线圈节距一致时，接收信号的幅度取最大值。我们发现，可以在 32 层层压板中成功检测到接收位置的分层。

项目成果

Detection of Delamination in GFRP Laminates by Electromagnetic Acoustic Transducers

通过电磁声换能器检测 GFRP 层压板的分层

• 发表时间: 2002
• 作者: Tomohiro Yamasaki; Shinya Motogi; Takehito Fukuda
• 通讯作者: Takehito Fukuda

Electromagnetic Acoustic Transducers for Detection of Delamination in GFRP Laminates

用于检测 GFRP 层压板分层的电磁声换能器

• 发表时间: 2003
• 作者: Tomohiro Yamasaki; Hideki Fujita; Shinya Motogi; Takehito Fukuda
• 通讯作者: Takehito Fukuda

Tomohiro Yamasaki, Shinya Motogi, Takehito Fukuda: "Detection of Delamination in GFRP Laminates by Electromagnetic Acoustic Transducers"Proceedings of the 6th Far-East Conference on Nondestructive Testing. 373-378 (2002)

Tomohiro Yamasaki、Shinya Motogi、Takehito Fukuda：“电磁声换能器检测 GFRP 层压板分层”第六届远东无损检测会议论文集。

Tomohito Yamasaki, Hideki Fujita, Shinya Motogi, Takehito Fukuda: "Electromagnetic Acoustic Transducers for Detection of Delamination in GFRP Laminates"Proceedings of International Conference on Advanced Technology in Experimental Mechanics 2003. (CD-ROM)

Tomohito Yamasaki、Hideki Fujita、Shinya Motogi、Takehito Fukuda：“用于检测 GFRP 层压板分层的电磁声换能器”2003 年实验力学先进技术国际会议论文集。（CD-ROM）

Tomohiro Yamasaki, Shinya Motogi, Takehito Fukuda: "Detection of Delamination in GFRP Laminates by Electromagnetic Acoustic Transducers"Proceedings of the 6th Far-East Conference on Nondestructive Testing. 373-378 (2002)

Tomohiro Yamasaki、Shinya Motogi、Takehito Fukuda：“电磁声换能器检测 GFRP 层压板分层”第六届远东无损检测会议论文集。