Nondestructive and noncontact characterization of bond quality in a polymer adhesive connection with zero-group velocity Lamb waves

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420031
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Aoyama Gakuin University
• Principal Investigator: Hideo Cho 青山学院大学, 理工学部, 教授 (60296382)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 高分子接着剤の接着性状評価 / 零群速度板波による非破壊検査 / レーザ超音波 / 接着剛性 / 数値シミュレーション

Outline of Final Research Achievements

The bonding technique with a polymer adhesive agent is expected to be one of alternative bonding technique for a metal/metal interface due to its high bonding rigidity and light weight. Nondestructive characterization of a bond quality is attempted with zero-group-velocity (ZGV) Lamb waves which have finite phase velocity. ZGV Lamb waves was generated with a pulsed YAG laser and detected with a laser interferometer. The frequencies of ZGV Lamb waves corresponding to the phase velocity of ZGV Lamb waves decreased with decreasing shear strength in the bonding area. The numerical simulation revealed that the decrease of the frequency would be caused by reduction of the rigidity on the interface between an adherent and a bonding layer. The frequency of ZGV Lamb waves would be one of good indicators of the bond quality.

Free Research Field

超音波計測