Instrumented Pendulum Impact Tester Now Also for Brugger Testing
Thus far there is a lack of standard methods for the testing of the tenacity and temperability of carburizing steels. Decades ago, however, Zahnradfabrik Friedrichshafen AG developed a method that could be used to test exactly these characteristics for the release and approval of the corresponding melts. This procedure, which is used by many manufacturers and users of carburizing steels, is called the Brugger test in the steel industry.
An impact bending test is performed to test the tenacity of the specimen. The specially shaped specimen with its lobes at both ends (similar to the model of a real toothed gear) is gripped in such a way that the impact fin impacts the broad surface of the lobe at an angle of 30 degrees. This action simulates the load applied to a tooth in the gear.
The dynamic force at break is determined as a measure of the impact strength of the specimen: it is the peak of the force vs. time curve calculated during an impact test.
The RKP 450 instrumented impact tester from Zwick, Ulm, which is designed for a max. impact energy of 450 Joules, is optimally suited for this test. The specimen is fixed in a special twin-screw clamping device enabling reationless gripping. A special base plate for quick change of the test fixtures and exchangeable fins on the pendulum allow the Zwick pendulum impact tester to be deployed for both the Brugger test and the standard impact bending tests according to Charpy.
The impact fin with its applied strain gages is subjected to high stresses during testing. For this reason, the fin is made from highly rigid steel with a special thermal treatment ensuring high wear resistance. The fin is easy to demount for maintenance and repair or for replacement.
The force vs. time curve during the testing procedure is captured at a measuring frequency of 1 kHz and a resolution of 16 bits (more than 65,000 increments to maximum force), processed, and then evaluated using the hardware and software package ImpactWin testXpert ®.
An impact bending test is performed to test the tenacity of the specimen. The specially shaped specimen with its lobes at both ends (similar to the model of a real toothed gear) is gripped in such a way that the impact fin impacts the broad surface of the lobe at an angle of 30 degrees. This action simulates the load applied to a tooth in the gear.
The dynamic force at break is determined as a measure of the impact strength of the specimen: it is the peak of the force vs. time curve calculated during an impact test.
The RKP 450 instrumented impact tester from Zwick, Ulm, which is designed for a max. impact energy of 450 Joules, is optimally suited for this test. The specimen is fixed in a special twin-screw clamping device enabling reationless gripping. A special base plate for quick change of the test fixtures and exchangeable fins on the pendulum allow the Zwick pendulum impact tester to be deployed for both the Brugger test and the standard impact bending tests according to Charpy.
The impact fin with its applied strain gages is subjected to high stresses during testing. For this reason, the fin is made from highly rigid steel with a special thermal treatment ensuring high wear resistance. The fin is easy to demount for maintenance and repair or for replacement.
The force vs. time curve during the testing procedure is captured at a measuring frequency of 1 kHz and a resolution of 16 bits (more than 65,000 increments to maximum force), processed, and then evaluated using the hardware and software package ImpactWin testXpert ®.
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