| タイトル | Assessment of Composite Delamination Self-Healing Under Cyclic Loading |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090028603 |
| 著者（英） | O'Brien, T. Kevin |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2009-07-27 |
| 言語 | eng |
| 内容記述 | Recently, the promise of self-healing materials for enhanced autonomous durability has been introduced using a micro-encapsulation technique where a polymer based healing agent is encapsulated in thin walled spheres and embedded into a base polymer along with a catalyst phase. For this study, composite skin-stiffener flange debonding specimens were manufactured from composite prepreg containing interleaf layers with a polymer based healing agent encapsulated in thin-walled spheres. Constant amplitude fatigue tests in three-point bending showed the effect of self-healing on the fatigue response of the skin-stiffener flange coupons. After the cycling that created debonding, fatigue tests were held at the mean load for 24 hours. For roughly half the specimens tested, when the cyclic loading was resumed a decrease in compliance (increase in stiffness) was observed, indicating that some healing had occurred. However, with continued cycling, the specimen compliance eventually increased to the original level before the hold, indicating that the damage had returned to its original state. As was noted in a prevoius study conducted with specimens tested under monotonically increasing loads to failure, healing achieved via the micro-encapsulation technique may be limited to the volume of healing agent available relative to the crack volume. |
| NASA分類 | Composite Materials |
| レポートNO | LF99-8692 |
| 権利 | No Copyright |
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