The stress-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: 10955291
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
The determination of the time to rupture at low stresses and temperatures despite existing methods still remains a challenge. A new unifying time-temperature parameter is proposed. It represents a modification of the efficient, but numerically unstable Manson-Brown parameter. It incorporates the most commonly used time-temperature parameters such as Larson-Miller, Manson-Haferd and Orr-Sherby-Dorn as special cases for the calculation of the master curves. The procedure chooses the most appropriate master curve for the test data and calculates the corresponding coefficients.
COBISS.SI-ID: 11700251
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
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