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The paper deals with the problem of material fracture prediction in metal forming processes. It was found that the application of well-established solutions for ductile fracture prediction to the modelling of cross rolling processes leads to serious errors. These errors result from the fact that the limit value of the damage function determined via uniaxial tensile and compression tests is too low...
The paper presents two new rotational displacement machines designed for use in compressors, pumps and motors. In these machines, the displacement space is created between four parallel rotors rotating in the same direction at the same angular velocity. The paper presents the essence of the new machines and the test results of prototypes in the compressor version. The test results and conclusions...
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