Dynamic fracture in PMMA was studied to determine the correlations among dynamic stress intensity factor KID, crack velocity a and acceleration a. Specimen geometry, a single-edge-cracked tensile plate with two circular holes, was employed to obtain the crack acceleration, deceleration and re-acceleration process in a single fracture event. KID was evaluated using the method of caustics in combination with a Cranz-Schardin high-speed camera and correlated with a and a. The behaviors of KID, a and a in a SEN specimen were also examined, and the following correlations were obtained: (1) KID was an increasing function of a, but their relation was not unique. (2) KID for a constant velocity a was larger when the crack was decelerated than when it was accelerated. (3) KID was dependent on both a and a, and KID for a = constant could be uniquely related to a.
All Science Journal Classification (ASJC) codes
- Computational Mechanics
- Modelling and Simulation
- Mechanics of Materials