13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- The nominal stress where AE energy is peak (σAEp) is low in 90° compared with 0° and 45°. The nominal stress at which AE energy starts to be released (σAEstart) is also low, in 90°. Figure 8. AE magnitude and peak frequency of as-received specimen of (a) 0°, (b) 45° and (c) 90° Figure 9. AE magnitude and peak frequency of 450°C annealed specimen of (a) 0°, (b) 45° and (c) 90°
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