This paper presents numerical simulation for press compaction of the powdered metal in a sintering process. Numerical simulation was done in Abaqus, utilizing DruckerPragerCap (DPC) model. Compaction simulated sample was a two level cylindrical component. Die and punches were modeled as a 2D analytically rigid shell. Position of the die was fixed, while the lower two punches were allowed to move in a vertical direction (direction of the compaction). Optimal results can be achieved, by optimizing the stroke properties of punches. To obtain realistic results, surface friction has been taken into account. Results of the simulation are variable magnitude density areas, distributed over a vertically split cross section of the cylindrical component.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 20099848Several invited lectures were given in UK (University of Cambridge, University of Bath) about phase behavior of mixtures of liquid crystals and various nanoparticles.
F.18 Transfer of new know-how to direct users (seminars, fora, conferences)
COBISS.SI-ID: 19978760The fatigue analysis of working rolls in hot strip mills is presented in this doctoral thesis. Besides the determination of the high cycle fatigue, a lot of other experimental work was performed. Chemical composition with microstructure before and after special heat treatment is given. Also hardness distribution in depth through the whole working layer is presented. Monotonic tensile and compressive tests were done at different temperatures of the specimens, which correspond to the real situation in the rolling gap. Besides tensile and compressive tests, also bending and Charpy impact toughness tests were done. Fracture mechanics parameters and fatigue crack growth analysis was experimentally determined and moreover, a complete fracture investigation was performed by using scanning electron microscope. At the end of the thesis a result of wear is shown, where special testing device was developed for this purpose.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 18008598The paper presents the fatigue and fracture parameters of SINT D30 steel whic have been determined experimentally using "Cracktronic" testing device.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 20920072