The emphasis is not on standard-based tests, but rather on specialized test methods used in the development of cast iron materials. These include progressive tensile and compression tests for determination of the load-dependency of the Young's modulus of gray cast iron, as well as determination of the static E0 modulus from the progressive load test. These tests are divided into several freely configurable stages, rather than a continuous test sequence, allowing the load-dependency of Young's modulus and the static E0 modulus of gray cast iron to be determined. I Young's modulus is determined at room temperature using two strain gages applied to the two sides of the specimens. At higher temperatures suitable strain measurement systems - mechanically applied or non-contact type - are used.
The need for complex progressive load tests to determine the E0 modulus arises from the stress-strain curve for gray cast iron, which is a curved line from the start and displays no linear elastic region.
Machines used for the tests include a 100 kN Zwick AllroundLine testing machine.The machine is equipped with the makroXtens extensometer for high-precision strain measurement, an LN2-cooled temperature chamber and a 900°C HT furnace. The ‘Cyclic Tests’ Master test program from the testXpert II testing software allows efficient implementation of the special requirements of the ÖGI, such as free stage-definition and customized results. The testing software option 'Universal connection of HBM measurement amplifiers’ enables synchronized importing and processing of strain-gage channels for Young's modulus determination in testXpert II.