Full-Field Determination of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V at Strain Rates up to s蜢1
The percentage of plastic work converted to heat during plastic deformation, represented as β, and known as the Inelastic Heat Fraction (IHF) or the Taylor-Quinney coefficient is investigated in tension samples of Ti-6Al-4V tested to failure at strain rates ranging from 1 to 7000 s−1. Quasi-static tests at strain rates at 1 s−1 were completed on a load frame while tests ranging from 500 to 7000 s−1 were completed on two separate split-Hopkinson bars. For each test, strain measurements were recorded on one side of the sample using Digital Image Correlation (DIC) while simultaneous temperature measurements were captured on the opposite side of the sample via infrared thermography. A method to determine β by combining the full-field temperature and strain measurements with the recorded force data is presented. Results demonstrating the dependence of β on plastic strain and strain rate are also described.
KeywordsInfrared thermography Digital image correlation Plastic work Thermomechanical Stored energy
The research was supported by the U.S.A. Federal Aviation Administration, Grant No. 11-G-004. The authors are grateful to Mr. William Emmerling, and Dr. Chip Queitzsch for their support and involvement.