缠绕张力作用下复合材料壳体爆破性能预测

Addressing the issue of stress distribution non-uniformity in adjacent fiber layers caused by stress relaxation effects during filament winding, the hoop winding process of a ϕ150 mm sand mandrel was taken as the research object. The hoop strain on the mandrel surface was measured experimentally and compared with simulation results. Based on consideration of residual winding stresses, a refined material property model for a ϕ480 mm composite case under complex winding patterns was established to predict the burst pressure under descending tension systems of 20 N and 30 N. The results indicate that when constant tension is applied during hoop winding, the residual stress in the fibers exhibits a trend of being lower in the inner layers and higher in the outer layers due to the stress relaxation effect of outer fibers on inner fibers. Case failure occurs in the hoop winding layers of the cylindrical section. Moreover, a 30 N descending tension magnitude increases the stress gradient between inner and outer layers, making the hoop winding layers more prone to failure. The predicted results are within the error range compared to experimental results, providing valuable insights for designing tension systems during the winding process of composite case and enhancing their load-bearing capacity.