International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428615100151

Development of Array DCPD System for Quantitative Ndt of Cavity Defect in Metallic Foam

Xiaojuan Wang, Shejuan Xie,Cuixiang Pei and Zhenmao Chen^a State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an, 710049, China. ^achenzm@mail.xjtu.edu.cn

ABSTRACT

In this paper, an array DCPD experimental system is developed through introducing a probe array and a multiplexer unit to the conventional DCPD system. Inspections with the new array system and the conventional system are conducted and compared. It is found that the noise due to the multiplexer is negligible small, and the new array system is very efficient for NDT of the cavity defect in Metallic Foam (MF). In addition, the DCPD signals of two aluminum foam specimens are tested by using the new array system, and the measured signals are used to reconstruct the cavity defect inside the specimen after a signal processing. The good reconstruction results reveal further the validity and efficiency of the new DCPD system for quantitative NDT of the MF material.

Keywords: Metallic foam, Nondestructive testing, Direct current potential drop, Probe array.

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