The SIT-300E impact testing machine is designed to evaluate the fracture of metal materials under dynamic stresses in Charpy method in accordance with standards. A Charpy pendulum with a precisely specified mass, drop height, and geometry is released from a predetermined angle to strike and fracture a specimen. Following the impact, the pendulum continues its upward swing to a certain height. The difference between the initial release height and the post-fracture height is utilized to calculate the primary testing parameter: the energy absorbed by the specimen during fracture. The calculated energy value is immediately displayed on the LCD panel in Joules (J).
The system features a digital display panel and an AC servo motor and driver for lifting the pendulum, clutch and braking system, measurement instrument, pendulum release mechanism, and a transparent protective guard. Engineered for user-friendly operation, the system allows operators to easily execute tests and obtain impact energy measurements. The pendulums are designed so that the center of percussion aligns perfectly with the specimen’s line of impact. This dynamic design eliminates all lateral forces on the shaft bearings upon striking the specimen. As a result, bearing friction is minimized, and the maximum kinetic energy of the pendulum is transferred directly to the specimen. By releasing the pendulum without a specimen in place and allowing it to complete an 11 half-cycle swing, the system automatically determines and calibrates the following parameters using the SELF-CALIBRATION menu option:
– Exact release angle
– Residual rise angle
– Actual impact velocity
– Failure energy (absorbed per unit area)
– Friction losses (calculated across the 11 half-cycle decay and applied to a single test swing)
The most critical parameter in impact testing machine is its pendulum design compliant with standard and adhering to design principles based on Center of Percussion. In tensile impact testing, the pendulum must strike the specimen configuration at its lowest point of travel to ensure the transfer of maximum kinetic energy. Parasite energy loss and structural vibrations are minimized, preventing measurement distortion. Furthermore, maintaining the exact standard-specified impact velocity range is critical in metal specimen Impact tests
Another key feature of the SIT-300E impact testing machine is the precise design of its frame and anvil, engineered for maximum rigidity and exceptional vibration damping. Due to optimization of the inertial torque, striker mass, and center of percussion (COP), vibrations are entirely eliminated upon striking the specimen.
The system supports optional pendulum instrumentation to determine and display parameters, including total fracture energy, crack initiation energy and crack propagation energy, specimen yield force and max. impact force. This instrumentation enables real-time plotting of force-time and velocity-time curves during the impact event. Additionally, the system includes dedicated software for off-line graphical analysis and curve plotting.
The machine executes calibration using two methods: indirect calibration (performed using standard reference test blocks); and direct calibration (utilizing integrated software to automatically calculate system friction. By analyzing both a single half-cycle swing and an 11 half-cycle swing, the system automatically determines the actual pendulum energy, actual impact velocity and angular positioning). The system includes specialized gauge blocks to adjust the striker-to-specimen distance, verify anvil perpendicularity, and ensure precise pendulum alignment.
For sub-zero testing, a dedicated liquid cooling bath is supplied. Compliant with ASTM E23, ISO-148, and EN 10045-2, the conditioning system features:
– An integrated chilling unit capable of reaching target temperature of -20°C, -40°C, and -80°C
– An electric stirrer to ensure uniform temperature distribution throughout the bath