Carbon-carbon coupons were loaded and unloaded in uniaxial tension to progressively higher loads. Hysteresis in the material was noted especially after the stress-strain curves became nonlinear at about 2000 μ. Each subsequent reloading showed an increase in the linear range similar to work hardening in metals except that the modulus was lower on each cycle. The onset of acoustic emission was monitored on each cycle and the computed felicity ratio correlated with the change in stiffness.
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