Fracture Mechanics of Fiber-Reinforced Composites

摘要: Quantitative understanding of the parameters which control composite fracture is imperative to implementation fail safe design and inspection critical load bearing structures. For isotropic materials, essentially controlled by a single parameter, e.g., toughness or stress-intensity factor. This one dimensional nature lends itself experimental quantification. However, for anisotropic composites there are at least seven primary controlling parameters: 1) crack length; 2) orientation with respect material axis anisotropy; 3) applied combined stresses; 4) lamination geometry; 5) deformational strength resp011Ses constituent lamina; 6) three kinematically admissible modes extension 7) trajectory. Because this large number parameters, quantification system~tic permutation must be realistically viewed as intractable. paper presents an analytical method reducing these from two furnishes observations -nich lend support theoretical model. An p~gram conducted on fiberglass reinforced epoxy where centrally notched-crack subjected loading. Several geometries tested varying external loading, different trajectories predicted These agree well observed mode. Such agreement suggests that further refinement, general condition laminated can characterized.