Fabrication of imitative cracks by 3D printing for electromagnetic nondestructive testing and evaluations. (May 2016)

• Record Type: Journal Article
• Authors: Yusa, Noritaka; Chen, Weixi; Wang, Jing; Hashizume, Hidetoshi
• Is Part Of: Case studies in nondestructive testing and evaluation. Volume 5(2016:Apr.)
• Page Start: 9
• Page End: 14
• Publication Date: 2016-05
• Subjects: Nondestructive testing -- Case studies -- Periodicals; Electronic journals; 620.112705
• DOI: 10.1016/j.csndt.2016.03.004
• Languages: English
• ISSNs: 2214-6571

Abstract

Abstract: This study demonstrates that 3D printing technology offers a simple, easy, and cost-effective method to fabricate artificial flaws simulating real cracks from the viewpoint of eddy current testing. The method does not attempt to produce a flaw whose morphology mirrors that of a real crack but instead produces a relatively simple artificial flaw. The parameters of this flaw that have dominant effects on eddy current signals can be quantitatively controlled. Three artificial flaws in type 316L austenitic stainless steel plates were fabricated using a powderbed-based laser metal additive manufacturing machine. The three artificial flaws were designed to have the same length, depth, and opening but different branching and electrical contacts between flaw surfaces. The flaws were measured by eddy current testing using an absolute type pancake probe. The signals due to the three flaws clearly differed from each other although the flaws had the same length and depth. These results were supported by subsequent destructive tests and finite element analyses. Highlights: Artificial flaws were fabricated using a 3D metallic printer to simulate real cracks. Several tests were conducted to confirm the validity of the flaws from the viewpoint of ECT. The proposed method can quantitatively control flaw parameters that impact ECT signals.