Shears of helical reinforcement in the deformed composite

AbstractThe solution of the problem, relating to the reinforcement shear and matrix of the composite is associated with the problem of its mechanical resistance, strength and stability. The interest to the spiral reinforcement is determined by using of its geometric peculiarities in order to minimize as regards to the shear in the loaded composite. We present a model problem of bending of a cylindrical rod with a screw armature. It is shown that the length step of the spiral reinforcement and the axial length of the deformation zone of the rod determine the critical shears values: in case of the multiplicity of the length of the deformation zone and the propeller pitch the shears in the end sections of the deformation zone are absent. We also show that there exists a critical length of the deformation zone, for which the maximum shears are realized. The problem is generalized for the case of armoring by a finite family of left-hand screw fittings. The results of work are used in designing of special aseismic composite supports, as well as structural design of electrical and optical cables