Fatigue evaluation of TC17 titanium alloy shaft with surface scratch based on FEA and fracture mechanics. (November 2020)

• Record Type: Journal Article
• Authors: Jinlong, Wang; Wenjie, Peng; Jing, Yu; Jingsi, Wang; Fengming, Du
• Is Part Of: Engineering failure analysis. Volume 117(2020)
• Publication Date: 2020-11
• Subjects: Fatigue life evaluation -- Surface micro-scratch -- TC17 titanium alloy -- Surface roughness; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2020.104961
• Languages: English
• ISSNs: 1350-6307

Abstract

Graphical abstract: Based on the designed fatigue test and the FEA results, an empirical formula is proposed to express the relationship between the stress and surface scratch. In addition, the unknown parameter related to TC17 and the specific stress intensity factor model are identified to estimate the critical surface scratch of TC17 titanium alloy shaft. Then, a specific fatigue life prediction model of TC17 titanium alloy shaft with surface scratch is developed and verified with the comprehensive application of classic fatigue theory, laboratory test data and the new modified formula. Highlights: A fatigue limit evaluation model for TC17 with surface scratch is proposed. The specific stress intensity factor and critical surface scratch are obtained. A new fatigue evaluation model for TC17 shaft with surface scratch is developed. Abstract: With the development of advanced mechanical equipment, more attention should be paid to the fatigue evaluation of the critical components affect by surface scratch, like the TC17 titanium alloy shaft. The designed fatigue test is carried out to reveal the negative effect of surface scratch on fatigue failure, and the fatigue limit model for TC17 titanium alloy with surface scratch is proposed based on the Murakami equation. Then, FEA with different surface scratches for TC17 titanium alloy shaft is carried out, an empirical formula is proposed to express the relationship between the stress and surface scratch. In addition, the unknown parameter related to TC17 and the specific stress intensity factor model is identified, to estimate the critical surface scratch of TC17 titanium alloy shaft. With the comprehensive application of the classic theory and new proposed models, a new fatigue life evaluation model of TC17 titanium alloy shaft with surface scratch is developed and verified, whcih is novel and essential to the maintenance of the damaged TC17 titanium alloy shaft.