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Acoustic emission in single filament carbon/polycarbonate and Kevlar®/olycarbonate composites under tensile deformation
Author(s) -
Ma B. T.,
Schadler L. S.,
Laird C.,
Figueroa J. C.
Publication year - 1990
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750110403
Subject(s) - acoustic emission , kevlar , materials science , composite material , polycarbonate , ultimate tensile strength , deformation (meteorology) , fracture (geology) , fiber , envelope (radar) , composite number , telecommunications , radar , computer science
An analysis of envelope signals of acoustic emission (AE) produced from carbon/polycarbonate and Kevlar®/polycarbonate composites undergoing tensile deformation has been carried out to identify the sources of emission. The Kaiser effect was reproduced to validate the AE technique. Two different fiber failure mechanisms, i.e., fiber fracture and fiber degradation in Kevlar®/polycarbonate composite have been identified. A one‐to‐one correspondence between acoustic emission signals and fiber fracture and degradation has been established. It is shown that the critical length of the fiber, evaluated by using acoustic emission signals, is helpful in understanding the fracture behavior of the composites, as affected by surface treatments of the fibers.