Journal article
Damage Detection Through Acoustic Emission During Post-Fatigue Residual Strength Test of CFRP Skin of a Cantilevered Wingbox Under Constant-Moment Loading
Journal of acoustic emission, Vol.36, pS9
01 Jan 2019
Abstract
Post-fatigue residual strength testing of carbon-fiber reinforced polymer (CFRP) panels is typically conducted to characterize the effect of the state-of damage on residual strength. It is expected that acoustic emission (AE) characteristics are quite different in fatigue-damaged CFRP laminates, as compared with pristine specimens. This study focuses on the effect of the internal damage accumulated during fatigue on the characteristics of AE generated during post-fatigue residual test loading. This test was conducted on the same panel described in the accompanying paper under the same AE test conditions. The CFRP panel was attached as a top-side component (e.g., skin) of a cantilevered wing box structure. The assembly was subjected to twelve quasistatic constant-moment loading/unloading cycles, sequentially increasing the load until panel fracture. Acoustic emission was monitored during loading using six R15I sensors. Far-field and near-field digital image correlation (DIC) systems were used to monitor local and global strain fields. Visual, flash thermography, and phased array ultrasonic inspections were used to assess the state-of-damage in the vicinity of the hole. In general, results revealed good correlation between AE activity and regions of primary damage and imminent fracture could be anticipated based on a combined, four-prong, approach based on information provided by the AE, namely: i) emission accumulation rate; ii) intensity of the AE signals; iii) planar location of the AE sources, and iv) emission distinguished via Principal Component Analysis.
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Details
- Title
- Damage Detection Through Acoustic Emission During Post-Fatigue Residual Strength Test of CFRP Skin of a Cantilevered Wingbox Under Constant-Moment Loading
- Creators
- Ryan J NeelJonathan AwerbuchTein-Min TanDidem Ozevin
- Publication Details
- Journal of acoustic emission, Vol.36, pS9
- Publisher
- Acoustic Emission Group
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Identifiers
- 991019296563904721