scholarly journals Predicting the Compression-After-Impact (CAI) strength of damage-tolerant hybrid unidirectional/woven carbon-fibre reinforced composite laminates

2018 ◽  
Vol 105 ◽  
pp. 189-202 ◽  
Author(s):  
Haibao Liu ◽  
Brian G. Falzon ◽  
Wei Tan
Keyword(s):  
Carbon Fibre ◽  
Composite Laminates ◽  
Reinforced Composite ◽  
Compression After Impact ◽  
Damage Tolerant

scholarly journals An Experimental Study of the Cyclic Compression after Impact Behavior of CFRP Composites

2021 ◽  
Vol 5 (11) ◽  
pp. 296
Author(s):  
Raffael Bogenfeld ◽  
Christopher Gorsky
Keyword(s):  
Composite Laminates ◽  
Composite Structures ◽  
Impact Behavior ◽  
Damage Growth ◽  
Compression Load ◽  
Kink Bands ◽  
Cyclic Compression ◽  
Compression After Impact ◽  
Ultimate Failure ◽  
Damage Tolerant

The behavior of impact damaged composite laminates under cyclic load is crucial to achieve a damage tolerant design of composite structures. A sufficient residual strength has to be ensured throughout the entire structural service life. In this study, a set of 27 impacted coupon specimens is subjected to quasi-static and cyclic compression load. After long intervals without detectable damage growth, the specimens fail through the sudden lateral propagation of delamination and fiber kink bands within few load cycles. Ultrasonic inspections were used to reveal the damage size after certain cycle intervals. Through continuous dent depth measurements during the cyclic tests, the evolution of the dent visibility was monitored. These measurements revealed a relaxation of the indentation of up to 90% before ultimate failure occurs. Due to the distinct relaxation and the short growth interval before ultimate failure, this study confirms the no-growth design approach as the preferred method to account for the damage tolerance of stiffened, compression-loaded composite laminates.

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