Abstract
The aeronautical industry, in its search for more weight-efficient solutions, increasingly uses composite materials due to their specific properties. However, these are vulnerable to loads perpendicular to their lamination plane. Due to these vulnerabilities, numerous studies have tried to evaluate the threat of different states of perpendicular loading, there are numerous studies of high and low velocity impacts of rigid projectiles, the impact of non-rigid projectiles such as birds, ice, etc. have also been studied. or rubber like that of a tire. However, the study of impulsive loads on composite materials is very scarce.
In this work, a combined experimental/numerical study is presented to evaluate the response of a fabric-type CFRP to shock waves, representative of impulsive loads due to explosions. The experimental tests were carried out at the so-called 'SIMLab Shock Tube Facility (SSTF)', at the Norwegian University of Science and Technology (NTNU). Laminates were tested at different pressures to investigate their behavior from an elastic response to total failure. In addition, two high-speed cameras were used to obtain, with the 3D-DIC methodology, the displacement fields. In order to study the internal damage produced in the laminates, non-destructive ultrasonic inspection techniques were used.
To reproduce the behavior of the laminates, a continuous damage model was used, which takes into account the intralaminar damages of the composite material such as fiber breakage. Interlaminar damage was modeled using cohesive surfaces.
Two-plane bending test applied to unidirectional composite laminates
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