Progress in Detecting Transverse Matrix Cracking Using Modal Acoustic Emission

摘要

Transverse matrix cracking (TMC) is the name given to the type of cracks which appear in cross-ply composites loaded in tension along a major material axis for example, in a [0,90]s graphite/epoxy coupon TMC occurs in the ninety degree plies when the composite is pulled along the zeroes. The cracks are usually through cracks meaning that they progress rapidly across the entire width of the specimen and it is generally accepted that they are the first failure mode to occur with rising load, beginning as early as 30% of ultimate load. Keen interest in TMC in polymeric composites was found in the mechanics of composites literature through the 1980s [1–7] and this stimulated measurements of TMC using acoustic emission techniques.