Investigation on TiBw damage distribution in machining of TiBw/TA15 composites by hybrid modeling

The non-destructive acquisition of the TiBw damage distribution is essential for high-quality machining of network-structured TiBw/TA15 composites. This study proposes a hybrid modeling approach to fill the research gap in TiBw damage characterization under stress loading. Specifically, in the construction of stress fields based on elastoplastic theory, the input for solving the pressure components in the cutting zone is directly derived from digital image correlation (DIC) analysis of the in-situ images, considering the sawtooth chip evolution. The DIC results also compensate for deviations in the slip-line field modeling of the tool contact zone under ploughing and rubbing effects. Based on the stress fields, the TiBw damage probability is evaluated with the Weibull function and Voronoi model. In this way, the network microstructure is incorporated while reducing reliance on empirical model parameters. The analytical results showed that the discretely distributed TiBw damage strongly correlated with the stress field and the network structure, with a TiBw damage probability threshold of 0.684. It provides valuable insight into assessing the TiBw damage centralization degree in the subsurface.