Abstract
Braided composite beams with an I-shaped cross-section, i.e. braided I-beams, possess high bending stiffness because fibers constituting the braiding structure are continuously oriented. Axial compression loading of a braided I-beam leads to progressive crushing when a chamfer is cut on one end. This configuration results in high energy-absorption performance. It is therefore possible to retain the space of a vehicle compartment in frontal and lateral collisions so that, in the automotive industry, it is useful for the side members of vehicles. To examine the energy-absorption mechanism of braided I-beams, observations have been made of the crush zone of a partially crushed I-beam. The crushing mechanism of a braided I-beam is similar to that of a composite cylinder in which reinforcing fibers are oriented in axial and hoop directions.
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