1.

NAGODE, Marko, HACK, Michael, FAJDIGA, Matija. Low cycle thermo-mechanical fatigue : damage operator approach.

The strain-life approach is standardized and widely accepted for determining fatigue damage. It was extended to non-isothermal cases by introducing an equivalent temperature approach (ETA). The paper presents its extension, the damage operator approach (DOA), enabling continuous damage calculation for isothermal and non-isothermal loading with mean stress correction. The cycle closure point, equivalent temperature, threshold temperature and rainflow counting are not necessary for the DOA any more. Both approaches are equivalent for the second run of block loading if temperature is constant.

COBISS.SI-ID: 11229467

2.

KLEMENC, J., RUPP, A., FAJDIGA, M. A study of the dynamics of a clapper-to-bell impact with the application of a simplified finite-element model.

Bells are exposed to severe loading conditions during ringing. In a simplified model was set up the clapper was replaced by a cylinder that was dropped against a block representing the bell. In the article the synthesis of a finite-element model for simulating the cylinder-drop test is presented and he results of the finite-element simulations are compared to the experimental data.

COBISS.SI-ID: 11605275

3.

JANEŽIČ, Miha, KLEMENC, Jernej, FAJDIGA, Matija. A neural-network approach to describing the scatter of cyclic stress-strain curves.

The article presents the method of scatter determination of cyclic curves for any selection of impact factors. The method is based on the use of combined neural networks. The example of the measured data for the compression alloy shows that the proposed method is appropriate to determine cyclic curves and their scatters. The advantage of using a combined neural network as compared to conventional methods is in the fact that the combined neural network describes precisely the impact of various influential factors and their combinations upon the form and scatter of the family of cyclic curves.

COBISS.SI-ID: 10954267

4.

OMAN, Simon, FAJDIGA, Matija, NAGODE, Marko. Estimation of air-spring life based on accelerated experiments.

The article deals with experimental evaluation and analytical modelling of creep, relaxation and low cycle fatigue of a rubber mixture that is used in the production of air springs. The developed model enables the description of the creep and relaxation of rubber at various temperatures after only few tests. Thus the time needed to characterize creep and relaxation shortens considerably.

COBISS.SI-ID: 11362075

5.

OKORN, Ivan, FAJDIGA, Matija, NAGODE, Marko. Analysis of test rig drive for air springs.

The article deals with an analysis of a test rig drive for air springs. On the test rig we can adjust the spring deformation and loading frequency, whereas the test rig geometry can be adjusted to various spring sizes. Four springs are tested simultaneously. During the loading phases of particular springs there is some time delay to diminish the energy input during the test cycle.

COBISS.SI-ID: 11155227