Progressive failure of a crossply composite laminate under uniaxial tension was characterized by correlating ultrasonic and acoustic emission measurements with damage in real time. Both ultrasonic backscattered energy and acoustic emission gave consistent results and proved to be sensitive indicators of matrix cracking and other failure mechanisms. The acoustic emission signals were analyzed by investigating the amplitude and count frequency and the corresponding applied strain. Loading/unloading tests showed that no additional damage occurs upon reloading up to the previous peak load.
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Acknowledgements--This work was sponsored by the Air Force Office of Scientific Research (AFOSR). The authors are grateful to Dr Walter F. Jones of AFOSR for his encouragement and cooperation, and to Mrs Yolande Mallian for typing the manuscript.
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