Finite Element Simulation of Elastic Waves for Detecting Anti-symmetric Damages in Adhesively-Bonded Single Lap Joint

J. Ocean Eng. Technol. 2009;23(6):124-130.

Woo Jin-Ho,Na Won-Bae

Department of Ocean Engineering Pukyong National University,Department of Ocean Engineering Pukyong National University

단면 겹치기 접착 조인트에 존재하는 비대칭 결함 탐지를 위한 탄성파 유한요소 시뮬레이션

우진호,나원배

부경대학교 해양공학과,부경대학교 해양공학과

Keywords: Finite element simulation, Elastic waves, Anti-symmetric damages, Adhesively-bonded single lap joint

핵심용어: 유한요소 시뮬레이션, 탄성파, 비대칭 결함, 단면 겹치기 접착 조인트

Abstract

This study presents a finite element simulation of elastic waves for detecting anti-symmetric damages in an adhesively-bonded single lap joint. Plane strain elements were used for modeling adherents (aluminum) and adhesives (epoxy). Three types of damage were introduced: thickness reduction, elasticity deterioration, and voids in the adhesive layers, and two excitation and reception arrangements (ER1 and ER2) were used to investigate the detectability of the damage. The simulation showed that symmetrically located damage, such as a thickness reduction, can be detected by one excitation and one reception arrangement (ER1) and anti-symmetric damages, such as elasticity deterioration and voids, can be detected by modified two-point elastic wave excitation (ER2). Compared with the ER1 arrangement, the ER2 arrangement does not require a baseline signal for damage detection; hence, an efficient method of anti-symmetric damage detection in an adhesively-bonded single lap joint is proposed.