Journal of The School of Marine Science and Technology,Vol.6 No.1
Numerical Experiments on Detecting of Defects in Weld Using
Characteristics of Dynamic Response for Thin Plate
Tetsutaro KAWAKAMI and Yukari AOKI
Abstract
The plate is one of the basic structural member,and it is important to detect the defects in welding part of plate and another structural members.Because,the defect becomes the cause of the fatal damage of the structure system. The purpose of this study is development of new evaluation method for detecting the defects in welding part of plate. A new evaluation method using the dynamic response of thin plate to steady state vibration was proposed in this study.Furthermore,to confirm the usefulness of proposed method,the numerical analyses for dynamic properties of some thin plate models by boundary element method are carried out.In these numerical analyses,the defect part is assumed to be free boundary and the intact part is assumed to be fixed boundary as the boundary conditions of thin plate boundary.
As the numerical results, the dynamic responses for the deflection on neighborhood the boundary of the rectangular plate with mixed boundary condition are shown.Results show the dynamic response of the thin plate with the mixed boundary condition well, and also confirm the usefulness of the proposed method for nondestructive evaluation of thin plate with defect on welding part.