Pendulum Impact Testers up to 750 Joules - Zwick PSW 750

Pendulum Impact Testers for Tests on Metals

A selection for impact tensile and impact bending tests on metals.

• The RKP 450 pendulum impact tester can be used for Charpy, Brugger, Izod, impact tensile and wedge impact tests to all established ISO, EN, ASTM, DIN and BS standards.
• The PSW 750 pendulum impact tester can be used for Charpy and impact tensile tests on metals to all established ISO, DIN, ASTM, EN and BS standards.

Key Advantages and Features

RKP 450 – Pendulum Impact Testers up to 450 Joules

• The standard unit has a vibration-damping steel casting, delivering a high level of mechanical stiffness and guaranteeing reliable test results
• Operation is fast and convenient with easy specimen insertion and pendulum release. This is especially vital for tests to ISO 148 and ASTM E 23 with temperature-conditioned specimens, as they must be impacted five seconds after removal from the temperature conditioning area.
• Operation is further simplified by rapid changing of Charpy fixtures and pendulums, coupled with direct access for maintenance, servicing and calibration as well as easy removal of specimen remains.
• testXpert II offers access to robust software packages for all regularly used standards plus instrumented and non-instrumented tests
• Zwick pendulum impact testers in the RKP 450 range meet the requirements of EC Machinery Directive 2006/42/EC and of EN ISO 12100 and EN ISO 13849-1/2. This also means that the failure of a separate safety control element will not cause the loss of overall instrument safety.
• RKP 450 pendulum impact testers thus offer highest protection for operator and instrument. An officially (TÜV) certified safety control system with redundant micro-controllers monitors the whole safety set-up.
• The electronics include a high-resolution angular encoder for precise measurement of the angle of rise. An RS232 interface is provided for connection to laboratory data management systems with plug and play PC connection via a USB port.
• A special mode allows temperature-conditioned wedge-impact tests to be performed in a temperature range from -45 °C to +85 °C.

Operating Principle of a Pendulum Impact Tester

The name "pendulum impact tester" is self-explanatory for the operation of the machine. A lifted mass has potential energy. This is converted to kinetic energy by the mass being exposed to a free fall. When the mass is bound to a fixed pivot (pendulum), the velocity vector is deflected. Impact loading of a material being tested is attained at the point of highest kinetic energy (equal to the minimum potential energy) of the mass. This takes the form of a "flexure test".

This pendulum impact tester is used for analyzing the break behavior of metallic materials at impact loading. An ideal standardized specimen is loaded in the flexure test until it is fully broken. The work required is measured and is referred to as the energy absorbed A_V. The term "notched impact strength" a_K is frequently used, which indicates the energy absorbed A_V on specimen cross-section S; it is measured in j/cm².

However, advanced test techniques examine the functions of the energy absorbed or the flexural force in travel and/or time (deformation of the specimen). Since thermal energy impacts the notched bar impact test to a high degree, this technique always relies on the temperature of the specimen. This becomes increasingly important if the temperature strays from ambient temperature through the use of temperature conditioning devices.