- Designed in accordance with ASTM-E23, ISO 148, EN-10045-2
- Mechanical brake and lift controls
- Pendulum design based on center of percussion analyzed by CAD-CAE
- Indirect calibration as per standard (calculating the machine friction during 11 semi-cycle swings of the pendulum and a half cycle swing forward via software, as well as automatic calculation of pendulum true energy, velocity, and angles)
- Full report on impact energy, pendulum release/lift angle, impact velocity, center of percussion, energy on cross section as well as friction loss
- Plotting force-time, and velocity-time graphs in failure
- Readings taken from LCD display
- Connectable to PC via RS-232 serial port for sending data to computer
- Digital angle measuring system
- Mechanical release control, safe and secure
- Equipped with special grip for placement of test piece ISC40
- Protective shield to protect the operator
According to standards, a pendulum with certain energy (mass, height and geometry) is released to hit the specimen and cause fracture. Upon fracture, the pendulum is lifted up to a certain height, and this difference in height is the main quantity measured in impact test which is the absorbed energy in fracture, then the corresponding energy is displayed on the instrument panel in Joules SIT-450 has a LCD display as well as manual control to release the pendulum. Working with this machine is so easy. The operator can easily test the specimen and read the impact energy. Pendulum is designed based on the minimum distance between the pendulum impact center and the impact line. This dynamic feature dissipates all lateral forces in bearings, thus imparts the whole energy of the pendulum to the specimen. By using “self-calibration” mode on the panel menu, while the specimen is not loaded to the machine and upon releasing the pendulum performing 11 semi-cycle swings, the following features are to be determined automatically:
•Release angel
•Actual impact velocity
•Friction loss ( based on 1 & 11 half swings cycle)
•The actual pendulum energy (by using pendulum energy at 90˚ ‘mgl’ shown on each pendulum)
Moreover, the machine is capable of installing instrumented pendulum impact tester by which, parameters such as total fracture energy, crack initiation energy, crack energy, specimen yield strength, max impact force as well as plotting force-time and velocity-time graphs can be calculated and displayed. This section is equipped with hardware interfaces and boosters with sampling rate of 250000 sample/second at the time of strike that enables it to perform precise measurement; there is also software to plot the required graphs off-line.
SIT-3450 is intended to measure impact strength of standard metal specimens. Materials that have similar properties under tensile or torsion tests in slow strain rhythm tend to change against brittle fracture when exposed to notch impact experiment. Materials when under instant load (impact), may behave quite different in comparison with quasi-static load (tensile). In fact, this experiment reveals differences among materials that cannot be observed during tensile test. The experiment is meaningful when carried out under certain temperature range to determine at which temperature the softness turns into brittleness and characterize the effect of temperature in the failure. Impact test is a proper criterion to determine and classify various materials behaviors specially metals. The impact testing machine can be widely used in different areas such as R&D, quality control, etc. as follows:
•Research on impact resistance of metals
•Quality control of metal alloys according to energy specifications
•Quality control of pressure materials in different industries such as pressure tanks
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