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Transverse bundle damage includes transverse matrix cracks (parallel to fibers) and delamination. The transverse cracks are considered the initiating damage mode with delaminations emanating from transverse crack sites. For the transverse and axial shear damage model, transverse crack densities and delamination lengths are treated as the active damage parameters. In delaminated regions, the interply bonding strength (user input) is reduced to the interply slidng shear stress (user input).
The model obtains the requisite stress distributions through shear-lag analysis. The failure criteria for delamination and transverse crack spacing are expressed in terms of the in-plane stresses. Composite stiffness reduction is accounted for by the energy change due to the increased crack density. Finally, the model assumes that there is no interaction between axial and transverse bundle cracking.
© 1995, M.S.C.