Evaluation of capacity for work of carbon/carbon composite materials for aircraft brake disks | Mekhanika | kompozitsionnykh | materialov i konstruktsii
> Volume 26 > №4 / 2021 / Pages: 477-489

Evaluation of capacity for work of carbon/carbon composite materials for aircraft brake disks

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Abstract:

An analysis of the effectiveness of using carbon-carbon composite materials for the manufacture of aircraft brake discs is carried out. Materials made using fundamentally different technologies were considered: materials with a pitch matrix formed by the liquid-phase method, with graphitized, carbonized and with a different ratio of carbonized and graphitized fibers, as well as materials made by the needle-stitching method, with a pyrocarbon matrix reinforced with tapes and felt. The performance of the brake discs was evaluated by testing the disc on a device that allows you to determine the strength of the most vulnerable zone of the disc – the spike. The disk loading scheme is close to real conditions, i.e. the groove is engaged with a power finger, which acts as a guide for the drum, and the load force is directed in the circumferential direction. During the testing process, the current loading parameters are continuously monitored up to failure. In addition, tests of samples of materials for tensile strength when the interlaminar shear and bending. Samples for testing the bending strength were cut from the disk along the radius with the application of force in the circumferential direction. The regularity of changes in strength during interlayer shear, bending, and spiking of the disk from the apparent density of the material used is determined. It was found that the strength of materials during interlayer shear is practically independent of the apparent density of the material, while the Flexural type of material is most preferable for improving the performance of the brake discs. strength and strength of the force elements of the disk structure correlates with the density of the material. Set the type of material is most preferable for improving the performance of the brake discs.

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