Vibration testing of components in automotive industry requires long testing times. To accelerate the vibration testing times without the loss of reliability of testing, a damage-based approach with the consideration of parameters defining vibration testing techniques is adopted. With special attention to excitation types sweep-sine and random, the damage based approach is applied. The vibration fatigue damage is researched from frequency domain point of view, considering the relationship between the time and the frequency domains. The Palmgren-Miner cumulative rule is applied to calculate the fatigue life. The application of the method is shown on two case studies. The results show that theoretical predictions can be used to compare different testing techniques, but are not so accurate when predicting actual times to failure.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 14221339The research presents experimental and numerical identification of the effect of dynamic effects on the sheet-metal blanking process. A novel laboratory blanking apparatus has been presented, offering a wide range of experiments with great repeatibility and controlled variation of process parameters. From the blanking experiment, yield and ultimate stresses in the out-of-plane direction are identified, and from the partial and sequential experiments, material damage, modelled by the Lemaitre damage model. Effect of material anisotropy in the in-plane direction on the out-of-plane characteristics is assesed. A numerical code, based on the extended finite element method and explicit central difference method, for two-dimensional modelling of elasto-plastic contact problems is presented, using damage accumulation up to fracture and crack propagation through the critically damaged area.
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COBISS.SI-ID: 14039579This is a Proceedings of an Internationa COnference on Engineerign Vibration, held from 7.-10.9.2015 in Ljubljana
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 14168859