Abstract
The feasibility of producing a model capable of predicting the evolution of interface degradation, matrix cracking, and delimitation at multiple sites in laminated continuous fiber composite plates subjected to monotonic loading, while still being computationally tenable is shown herein. Due to the complicated nature of the many cracks and their interactions, a multi-scale micro-meso-local-global methodology is employed in order to model damage modes. Interface degradation is first modeled analytically on the micro-scale, and the results are homogenized to produce a cohesive zone model that is capable of predicting interface fracture. Subsequently, matrix cracking in the plies is modeled analytically on the meso-scale, and this result is homogenized to produce ply level damage dependent constitutive equations. The evolution of delaminations is considered on the local scale, and this effect is modeled using a three dimensional finite element algorithm. Results of this analysis are homogenized to produce damage dependent laminate equations. Finally, global response of the damaged plate is modeled using a plate finite element algorithm. Evolution of all three modes of damage is predicted via interfacing the four scales into a single multi-scale algorithm that is computationally tenable for use on a desktop computer. Results obtained herein suggest that this methodology is not only feasible, but may be capable of accurately predicting complex damage patterns such as that observed at sharp boundaries and open holes in laminated plates.
Phillips, Mark Lane (1999). A computational model for predicting damage evolution in laminated composite plates. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1999 -THESIS -P49.