Abstract
Fiber reinforced composites are susceptible to failure in interlaminar fracture mode called as delamination. Introduction of reinforcements in through the thickness direction (z-pins) suppresses the interlaminar fracture. Flying wedge test method was devised to examine the loading rate effects on dynamic delamination in the z-pinned composite laminates. The unpinned laminates were found to fracture in continuous stable crack propagation for the wedge velocities of 0–40 ms−1. The z-pinned laminates were found to fracture in series of unstable crack propagations for the same range of wedge velocities. It was observed that the critical mode I strain energy release rate for unpinned laminates increases with increasing wedge velocity. The critical mode I strain energy release rate was observed to decrease with increasing wedge velocity for the z-pinned laminates.
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