Conclusion
A multi-scale progressive failure modeling scheme is presented to analyze the damage initiation and development of 3D angle-interlock woven composites under uniaxial tension load. The macroscale failure behaviors are simulated based on a RVC model by using inhomogeneous finite element method. Fiber yarn breakage, inter-fiber yarn fracture is predicted by using modified Puck criteria, the matrix crack is predicted by using the parabolic yield criterion. Experimental results show that initial damage first occurs in matrix on the surface of the specimen, then the matrix particles detaches gradually with the increasing of the load. Finally, the brittle fracture occurs on the specimen along with the warp yarns breakage. The proposed model is correlated and validated by experimental study. Simulated damage evolvement and failure modes agrees well with that observe in experiment. Results show that damage initiates in matrix first and expands gradually when strain is in the range of (0.54% - 0.94%). Then slight damage related to occurs around the strain of 1.15%. When strain reaches around ??,1 1.80%, damage related to expands rapidly and the warp fibers breakage result in the failure of ??,1 the whole structure. Additionally, models with different mesh sizes are simulated. The calculation results indicate that 0.25 mm is a reasonable mesh size. In conclusion, the proposed model can predict the damage evolution progress of a full-size specimen with considering the fiber breakage, inter-fiber fracture and matrix crack.
