The influential factors on very high cycle fatigue testing results

Effect of Low Cycle Fatigue Predamage on Very High Cycle Fatigue Behavior of TC21 Titanium Alloy

The effect of low cycle fatigue (LCF) predamage on the subsequent very high cycle fatigue (VHCF) behavior is investigated in TC21 titanium alloy. LCF predamage is applied under 1.8% strain amplitude up to various fractions of the expected life and subsequent VHCF properties are determined using ultrasonic fatigue tests. Results show that 5% of predamage insignificantly affects the VHCF limit du...

Redesigning axial-axial (biaxial) cruciform specimens for very high cycle fatigue ultrasonic testing machines

The necessity to increase performances in terms of lifetime and security in mechanical components or structures is the motivation for intense research in fatigue. Applications range from aeronautics to medical devices. With the development of new materials, there is no longer a fatigue limit in the classical sense, where it was accepted that the fatigue limit is the stress level such that there...

The effect of microstructure on very high cycle fatigue properties in Ti-6Al-4V

The Influential Factors in Profiting the Research Evidences and Results in Clinical Practice by Rehabilitation Practitioners

Objective: This study intends to determine the factors attributed to the use of research evidences results in practice, by rehabilitation’s practitioners in educational hospitals of Tehran. Materials & Methods: In this study, the research community included all the 485 rehabilitation practitioners working in educational hospitals of Tehran. The samples were consisted of 165 persons which hav...

Very High Cycle Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy DZ4

The effect of casting pores on the very high cycle fatigue (VHCF) behavior of a directionally solidified (DS) Ni-base superalloy DZ4 is investigated. Casting and hot isostatic pressing (HIP) specimens were subjected to very high cycle fatigue loading in an ambient atmosphere. The results demonstrated that the continuously descending S-N curves were exhibited for both the casting and HIP specime...