Abstract
The use of advanced composite materials is becoming more and more frequent in structures that support great effort due to having a higher specific stiffness, which allows for reducing the weight of structures. The manufacturing methods associated with this type of material mean that the reinforcement element, the fibre, has its integrity easily reached with the occurrence of small impacts. The present study aimed to obtain a numerical evaluation of the performance of carbon fibre-reinforced polymer (CFRP) tubular profiles subjected to transverse low-speed impact, using FEM (Finite Element Method) code based. The crucial point of the study was to promote various impact tests with different energy levels and correlate with the strain results, defining for the purpose tube, the energy limit that produces residual deformation. Laminated composite tubes subjected to low-velocity impacts could suffer permanent deformation even when it is not eye-visible. Some of these invisible damages could promote a crack initiation in tube layup, reducing the fatigue life of specimens. This study allowed to obtain a classification of the structural integrity of a composite tube under gradient low-speed impact tests, which represents a piece of important information to establish a parallelism between the residual strength and fatigue life in experimental testing.
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