Application of thermal imaging system for prediction of fatigue crack initiation in Ti-6Al-4V fabricated by EBM

Abstract

Additive manufacturing technology-Electron Beam Melting (EBM) is very promising for providing components with bulk density and high material performance, comparable to wrought material. However fatigue loadings are crucial for application in aerospace and automotive industries. Therefore it is necessary to predict the moment of the crack initiation and find the defect that acts as a stress concentrator within the considered element. The solution described in this paper is passive thermography method conducted during fatigue test of Ti6Al4V specimens as to measure temperature rise during the test. In order to achieve this objective, a thermal imaging system was proposed.

New possibilities for in situ CT analysis of additive manufactured samples

“…The undoubted advantage of the method described in the paper is the possibility of carrying out non-destructive analysis of the internal and external geometry of examined objects with a resolution from a few to dozens of micrometers (Gapinski, Janicki, Marciniak--Podsadna, Jakubowicz, 2016). Apart from porosity analysis (Ziółkowski, Chlebus, Szymczyk, Kurzac, 2014), the detection of cracks, inclusions or discontinuity, and the dimensional control of manufactured geometry (Barciewicz, Ryniewicz, 2018), computed tomography is increasingly used in combination with tensile tests (Koruba, Karoluk, Ziółkowski, Chlebus, 2018;Mertens et al, 2017) or compression tests (Jansson, Pejryd, 2019;Dhillon, Schneider, Kuhn, 2011). Conducting such tests is possible with the use of mini testing machines that are specifically adjusted to work in CT measurement conditions (Hufenbach et al, 2012;De Chiffre et al, 2014).…”