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Imminent fracture detection in graphite/epoxy using acoustic emission

Acoustic-emission monitoring of six-ply [0/+45/−45], graphite/epoxy laminates has revealed that tensile fracture is preceded by a sudden reduction in the acoustic-emission output

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Abstract

An experiment designed to detect incipient failure in graphite/epoxy tensile specimens is described. Tests using eighteen samples of six different graphite/epoxy compositions in six-ply balanced [0/+45/−45], laminates indicate that a failure precursor does exist. This precursor takes the form of a sudden reduction in the acoustic-emission output at 99 percent of the ultimate tensile load, and evidence indicates that the reduction is the result of a change in the fundamental failure mechanism. The shape of the acoustic-emission countrate curve is analyzed and found to correlate well with micro-mechanical fracture activity.

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Authors and Affiliations

  1. Naval Air Development Center, 18974, Warminster, PA

    John M. Carlyle (Physicist)

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  1. John M. Carlyle
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Carlyle, J.M. Imminent fracture detection in graphite/epoxy using acoustic emission. Experimental Mechanics 18, 191–195 (1978). https://doi.org/10.1007/BF02324141

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  • DOI: https://doi.org/10.1007/BF02324141

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