Calculation and experimental study of transverse tension and compression of a rubber-cord composite with a unidirectional scheme of reinforcement is presented. The calculation results for components of the composite and for the composite as a whole are compared with the experimental data. The loss of stability of the deformed rubber-cord composite in transverse tension is analyzed.This study presents the results of calculation and experimental investigations of a rubber-cord composite with a unidirectional scheme of reinforcement at large deformations in transverse tension and compression. The tension and compression tests of the rubber-cord composite in the direction transverse to the stacking of cord threads are duplicated by calculations according to a procedure based on the structural macroscopic theory of composite materials [1,2].We studied the deformation properties of a rubber-cord composite material in the body of a pneumatic tire of radial design. The body includes seven identical rubber-cord layers with a total thickness of the layer packet 0.8 cm. The matrix of the body is made of soft rubber. Layers of the body contain threads of 23 KNTS nylon cord located along the meridians of the body configuration. The geometry of the rubber-cord composite has the following parameters: spatial density of reinforcement I m = 50 cm -2 at the surface density of the thread arrangement across the profile of the body and along its height v~ = 5.70 cm -1 and v~ ---8.75 cm -1 (im__v~vm),l u respectively, with diameter of threads of the reinforcing cord d m = 0.07 cm. The volume fraction of cord threads is fm= I~d~/4 = 0.19. The packing of threads in our calculation model is regarded as rectangular.In calculating the transverse compression of the rubber-cord composite, we used the effective tensile modulus of the cord determined in tensile tests of individual threads. The effective modulus of constrained compression of the cord, which was determined from longitudinal compression tests of rubber-cord specimens, was used for evaluating the transverse tensiowof the rubber-cord composite material. The elastic modulus of the rubber matrix of the composite was found from tensile tests of a rubber specimen having the same physicomechanical properties as the rubber matrix.The experimental dependences for the rubber-cord composite as a whole and for its constituents were constructed on the basis of the results obtained in tension on a RMI-60 machine and in compression on a ZE-400 machine. The specimens were extended and compressed at a rate of 50 mm/min. Every reading was preceded by a five-minute delay in order to eliminate the rapid relaxation processes going on in the structural constituents of the composite.
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