Dynamic characterization of Ti-4Al-1.5Mn titanium alloy and a simplified approach for shot peening simulation
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ORIGINAL ARTICLE
Dynamic characterization of Ti-4Al-1.5Mn titanium alloy and a simplified approach for shot peening simulation Nan Su 1 & Minghe Chen 1 & Lansheng Xie 1 & Wenxiang Shi 1 & Feng Luo 1 Received: 8 July 2020 / Accepted: 19 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract To predict the residual stress distribution of the Ti-4Al-1.5Mn (TC2) alloy in the manufacturing process, quickly and accurately, a precise dynamic constitutive model for rheological behavior and a new simplified approach for numerical simulation were proposed. The dynamic stress-strain curves indicate that the enhancement effect and plasticizing of the TC2 alloy are sensitive to high strain rates. The dispersed β particles play an important role in the formation of the adiabatic shear band and not widened significantly. The average relative error of 1.04% and the correlation coefficient of 0.9949 indicate that the modified JohnsonCook constitutive model well describes the rheological behavior. Then, with the help of the Almen test, an efficient but simplified approach was proposed to achieving coverage and uniform loading in simulation. At last, the residual stress contribution of the TC2 alloy in the shot peening test is in a good agreement with the simulation results by random multipellet model. Keywords Shot peening . TC2 alloy . Numerical simulation . Residual stress . Dynamic characterization
1 Introduction Ti-4Al-1.5Mn (subsequently referred to as TC2) is a kind of α + β type titanium alloy, which has the characteristics of low density, high specific strength, good plasticity, and weldability [1–3]. Therefore, its sections, sheets, and pipes are widely used in aircraft wings, flaps, tubing, and other components. In order to increase the service life of parts, shot peening is a common process used to improve the fatigue resistance, which can form residual compressive stress inside
* Minghe Chen [email protected] Nan Su [email protected] Lansheng Xie [email protected] Wenxiang Shi [email protected] Feng Luo [email protected] 1
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, 210016 Nanjing, People’s Republic of China
the required locations of the components [4–7]. In the actual application, it is an important task to determine the process parameters quickly and accurately with numerical simulation [8–10]. For the TC2 alloy, a precise dynamic constitutive model for rheological behavior and an approach for numerical simulation are very timely studies in shot peening process researches. The dynamic response of metals at high strain rates is quite different to that of quasi-static deformation. Working in the dynamic response of metals started primarily a few decades ago, and the investigations of various metals at strain rates ranging from 10−3 to 104 s−1 had been done recently. Via the dynamic experiments on titanium alloy TC4 (Ti-6Al4V), aluminum alloy AA7075, and magnesium alloy AZ80, Elmagd and Abourid
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