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Crack propagation analysis in multilayered pipes
Bareš, Pavel
The fracture behavior of multilayered pipes applied for water and gas distribution is analyzed in this paper. The attention is focused on numerical modeling of crack propagation through twolayered pipe. Special attention is paid to the influence of interface between the layers on fatigue crack growth. The analysis is performed under the assumption of validity of linear-elastic fracture mechanic. Numerical calculations are performed by finite element method (system ANSYS).
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Statistical processingof fatigue tests in LATEX
Balda, Miroslav ; Svoboda, Jaroslav ; Fröhlich, Vladislav
The paper deals with a problem of making up protocols on material fatigue tests containing measured data, their regression, 90% and 95% confidence intervals, a diagram of all these functions, and a table of the processing results. All these steps are done in one computer run in the LATEX environment without any import of external graphics or results. New styles have been developed for the purpose. The system is fast reliable.
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Vibration of a 1DOF system excited by energy source with limited power and inertia
Půst, Ladislav
The oscillations of a linear system with one degree of freedom forced by a mechanical spring exciter connected to the motor with limited driving moment and limited moment of inertia are investigated. Limited power and inertia of motor causes distortion of harmonic motion and non-uniform passage through resonance zone as well as jump phenomena in frequency. The influence of pre-stress of spring connection between oscillating system and motor is studied as well.
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