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Effect of near-surface impact-induced damage on the residual strength of woven glass/epoxy composite beams
Sub-critical instrumented impact tests were used to introduce small amounts of damage in the upper layer of beams made of 32-ply NEMA/ASTM G-10 grade woven-glass-reinforced epoxy resin. When a second, destructive, impact load was applied to the upper (damaged) surface of the specimens, they showed no loss in strength. When the second impact was applied to the lower (undamaged) surface, the measured strength was considerably lower than the strength of virgin specimens. The drop in residual strength is observed when the first impact energy exceeds 60 % of the critical failure energy. Experimental observations and theoretical estimation confirm that this threshold damage energy corresponds to initiation of kinks in the near-surface composite plies subjected to compression. Owing to the effect of kinks, the initial mode of failure of the damaged specimens is different from that of undamaged specimens. The influence of deflection rate on the residual strength is also investigated.
Effect of near-surface impact-induced damage on the residual strength of woven glass/epoxy composite beams
Sub-critical instrumented impact tests were used to introduce small amounts of damage in the upper layer of beams made of 32-ply NEMA/ASTM G-10 grade woven-glass-reinforced epoxy resin. When a second, destructive, impact load was applied to the upper (damaged) surface of the specimens, they showed no loss in strength. When the second impact was applied to the lower (undamaged) surface, the measured strength was considerably lower than the strength of virgin specimens. The drop in residual strength is observed when the first impact energy exceeds 60 % of the critical failure energy. Experimental observations and theoretical estimation confirm that this threshold damage energy corresponds to initiation of kinks in the near-surface composite plies subjected to compression. Owing to the effect of kinks, the initial mode of failure of the damaged specimens is different from that of undamaged specimens. The influence of deflection rate on the residual strength is also investigated.
Effect of near-surface impact-induced damage on the residual strength of woven glass/epoxy composite beams
Der Einfluß einer durch Schlag induzierten oberflächennahen Schädigung auf die Restfestigkeit von Verbundträgern aus Epoxidharz und Glasfasergewebe
Lifshitz, J.M. (author) / Gandelsman, M. (author)
Composites Science and Technology ; 57 ; 205-216
1997
12 Seiten, 10 Bilder, 5 Tabellen, 24 Quellen
Article (Journal)
English
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