Assessing the Effect of Material Inter- and Autocorrelation on Composite Structure Reliability
Please login to view abstract download link
Material imperfections negatively affect the properties of composites. Measurements show that these imperfections are spatially correlated. However, structural reliability analyses often neglect the auto- and intercorrelation of material variability. It remains unclear whether this simplification is justified or not. Therefore, this paper utilizes a numerically efficient multiscale framework to capture the composite spatial variability of fibre volume fraction, fibre misalignment and fibre strength at the micro- and mesoscale. At the structural macroscale, intercorrelation between homogenized apparent material properties is modelled using state-of-the-art vine copulas. The effect of auto- and intercorrelation on the tensile strength of a unidirectional coupon is studied first. Next, their effect on the burst pressure of a composite pressure vessel is investigated to serve as a structural example. The sensitivity analysis elucidates the importance of including material inter- and autocorrelation during the propagation of composite variability.