Stochastic failure analysis of composite pipes subjected to random excitation

Abstract

Abstract In this research, random vibrations and failure analysis of composite pipe are stochastically investigated. For this purpose, free vibrations of the pipe are studied using both analytical and numerical methods considering effects of various parameters such as boundary conditions (B.C s), pipe dimensions and layup configurations. In the next step, random vibrations of the pipe under excitation of white noise are studied using numerical method. The power spectral density function (PSDF) of the stress responses along with the root mean square (RMS) of on-axis stress components are extracted and then failure occurrence is evaluated. Then, time history dynamic analysis is carried out on the same pipe and the results are compared. A real earthquake excitation is analyzed using both random vibrations and time history dynamic analyses. Comparing the results, advantages and disadvantages of each method are discussed. Finally, stochastic modelling is performed treating manufacturing-induced uncertainties as random variables. Thus, stochastic analysis of the composite pipe response exposed to random excitation is done. Results show the importance of taking into consideration manufacturing-induced inconsistencies for failure analysis of the pipe exposed to random excitation.