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ON MODE I AND MODE II BRIDGING LAWS AND BRIDGING MECHANISMS IN Z-PINNED COMPOSITE LAMINATES

This paper reviews our recent progresses in the research on z-pinning reinforcement. The contents will include theoretical, numerical and experimental studies on mode I and mode II z-pinned delamination fracture and corresponding bridging laws. Experimental method of bridging law evaluation will be introduced. Comparison of experimental results and theoretical prediction on a z-pinned double-cantilever beam (DCB) mode I delamination with the evaluated bridging law will be provided to confirm the reliability of the methods. A parametric study by the finite element method (FEM) will be presented to both Mode I and Mode II z-pinned delaminations. A latest result of the effect of loading rate on Mode I delamination growth will also be introduced.