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Computer modelling of operating processes for both simulational and experimental investigation of fracture problems

Čačko J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2001

z. 67

7-26

The problem of evaluation and computer modelling of operational processes with both continuous and discontinuous nature is presented in the paper. We suppose the knowledge of statistical characteristics of the continuous component in the frame of correlation theory - frequency probability density function of the distribution and power spectral density or autocorrelation function respectively. A simulation model is based on modelling of time-series with application for gaussian and nongaussian processes. Discontinuous events are assumed as a sequence of various impacts with Poissonian distribution, and they are superimposed to a continuous component. A cumulative damage is continuously evaluated regarding to a closed hysteresis loops counting. A fatigue damage mechanism is represented either by rainflow matrix or by a fatigue damage function. The function is specified using some hypothesis of a fatigue cumulative damage and fatigue failure criteria.