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Validation of the Thermal Softening Effect at a Wide Range of Strain Rates by Using the Taylor Impact Test
|저자명||MingJun Piao, Hoon Huh, Ikjin Lee, Hyungwon Kim, Leeju Park|
|Name||9th International Symposium on Impact Engineering|
The thermal softening occurs simultaneously with strain hardening when a material undergoes plastic deformation. In order to investigate the thermal softening behavior at different strain rates, several uniaxial tensile tests are performed at different strain rates and temperatures by using four kinds of materials: 4340 steel (BCC); 4130 steel (BCC); OFHC copper (FCC); and Ti6Al4V alloy (HCP). Uniaxial material tests are performed at a wide range of strain rates from 103 s1 to 103 s1 by using an INSTRON 5583, a High Speed Material Testing Machine (HSMTM), and a Tension Split Hopkinson Pressure Bar (TSHB). Moreover, tensile tests are performed at temperatures of 25 ℃ and 200 ℃ and at strain rates of 103 s1 ,101 s1, and 102 s1, respectively. The thermal softening behavior is evaluated with the Taylor impact tests which accompany with high strain rates and high plastic deformation. A modified thermal softening model is utilized for the accurate application of the thermal softening effect at different strain rates. The thermal softening effect is evaluated by comparing the seven sequentially deformed shapes of the projectile from numerical simulation results with the experimental results of Taylor impact tests.