Mr. Atsushi Akai Profile

Atsushi Akai

at Toyota Central R&D Labs Inc

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Proceedings Article | 5 May 2017 Paper

Fatigue limit estimation of titanium alloy Ti-6Al-4V with infrared thermography

Atsushi Akai, Daiki Shiozawa, Takahide Sakagami

Proceedings Volume 10214, 102141J (2017) https://doi.org/10.1117/12.2263843

KEYWORDS: Titanium, Thermography, Metals, Nondestructive evaluation, Temperature metrology, Aerospace engineering, Infrared radiation, Infrared materials, Crystals, Analytical research, Infrared cameras, Absorption, Polishing, Servomechanisms, Product engineering

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Fatigue limit estimation using infrared thermography has recently received attention as a method for reducing the time required for product design. In this study, the applicability of a method based on mean temperature and dissipated energy measurements was experimentally investigated on a titanium alloy; fatigue plate specimens were fabricated from the titanium alloy Ti-6Al-4V ELI. The fatigue limit of these specimens obtained from conventional fatigue testing was found to be 620 MPa. The estimated fatigue limit obtained from mean temperature measurements was found to be 600 MPa, although estimating the fatigue limit using dissipated energy measurements was difficult because little significant change in dissipated energy values with the stress amplitude was observed. These tendencies are probably attributed to the crystal structure displaying different deformation properties and high vibration absorption properties. The resonance components from the fatigue testing instruments (noise components) were calculated from the frequency analysis of the time-series temperature fluctuation data measured by infrared thermography. The increase in the dissipated energy values (with the noise components subtracted) against the stress amplitude changed at a certain stress amplitude and the fatigue limit could be estimated to be 565 MPa. Therefore, the relative error between the fatigue limit value obtained from conventional fatigue testing and the estimated values was within 10%. The fatigue limit could be estimated more accurately by considering the influence of different deformation properties between tensile and compressive loading due to the crystal structure differences in the dissipated energy measurement.

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