Fatigue crack growth under mixed mode I + II in Ti-6Al-4V specimens produced by Laser powder Bed fusion. (1st April 2022)

• Record Type: Journal Article
• Authors: Jesus, J.S.; Borrego, L.P.; Ferreira, J.A.M.; Branco, R.; Costa, J.D.; Capela, C.
• Is Part Of: Engineering fracture mechanics. Volume 264(2022)
• Publication Date: 2022-04-01
• Subjects: Ti-6Al-4V alloy -- Laser powder bed fusion -- Fatigue crack growth -- Mode I+II -- Mixed-mode fatigue crack growth; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2022.108327
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Crack deflection angle was a relevant parameter in mixed-mode fatigue crack growth. Fatigue crack growth speed didn't suffer high alterations with the loading angle. Predomination of mode I loading for all loading angles. Similar crack closure effect for all loading angles. Failure mechanism was the intergranular separation. Abstract: Mode I and mode I + II fatigue crack growth experiments are performed using compact tension shear specimens made of Ti-6Al-4V by additive manufacturing for various loading angles. The performance of various methodologies used to determine the equivalent stress intensity factor were studied, obtaining good results in simpler methods when the crack deflection angle was also included in the algorithm. The crack growth speed didn't suffer significant alterations due to similar values of crack deflection angle, mode I loading predomination and similar crack closure effect. Fractured surfaces presented irregular regions consequence of intergranular separation between α phase and agglomerations of β phase.