Effect of fatigue damage on static and dynamic tensile behaviour of electro-discharge machined Ti-6Al-4V

• Published in: Fatigue & fracture of engineering materials & structures Vol. 35; no. 12; pp. 1120 - 1132
• Main Authors: LÓPEZ, J. G., VERLEYSEN, P., DEGRIECK, J.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.12.2012; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Crack propagation; Cyclic loads; Damage; Dynamic tests; EDM; Exact sciences and technology; Fatigue; Fatigue (materials); Fatigue failure; Fatigue life; Fracture mechanics; impact; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; tensile properties; Tensile strength; Ti-6Al-4V; Titanium base alloys; damage; tensile properties; Ti-6Al-4V; impact; Mechanical properties; Fatigue; Tensile property; Aluminium alloy; Vanadium alloy; Titanium base alloys; Electrical discharge machining; EDM
• ISSN: 8756-758X; 1460-2695
• DOI: 10.1111/j.1460-2695.2012.01699.x

ABSTRACT The fatigue performance of electro‐discharge machined Ti‐6Al‐4V and, more specifically, the effect of cyclic damage on the static and dynamic tensile properties of the material have been investigated. In a first step, fatigue failure was studied. Afterwards, tensile tests were performed on specimens that had been previously subjected to cyclic loading during predefined fractions of the fatigue life. In addition to conventional experiments at quasi‐static strain rate, dynamic tests were performed using a split Hopkinson tensile bar setup. The edges of some of the specimens were removed after cyclic loading to discriminate between the effects of damage at the edges and in the bulk of the material. Results revealed that early fatigue failure is due to the growth of cracks on the machined edges of the specimens. Edge cracks can randomly reduce fracture strain and energy absorbing capacity. However, cyclic damage does not affect the tensile properties of the bulk material.