Taylor Impact Test시 고속 카메라 영상을 사용한 폴리머 재료의 동적 거동 해석

To evaluate dynamic material properties of metallic materials at high-strain-rate. several one-dimensional models using recovered projectiles by Taylor Impact tests have been developed. However, for polymeric materials, the models can not be used as developed because polymers show significant elastic and anelastic deformation. This limitation could be released by incorporating the high-speed photography technique with Taylor impact tests in the range of impact velocity from 150 to 350 m/s. A series of photographs made it possible to depict the deformation pattern and to measure instantaneous diameter along the projectile length. In addition, it gave a relationship between the deformation length and the elapsed time which make possible to calculate a strain rate at an instant of deformation. The strain rate dependance of the dynamic yield stress in thermoplastic materials of PE, PC and PEEK can be determined by rod impact test in the strain-rate range of 10³~10⁴ sec?¹.