The influence of the weaving pattern on the interface friction in aramid fabrics under the conditions of the transverse loading

Experimental investigation and computational estimation of the interface friction in aramid woven fabrics for different weaving types are performed under the conditions of the transverse compression. The required range for the compressive loads is estimated by the use of FE-modelling of impact loading of the multi-layer woven barriers. For the moderate values of transverse compression the simple sliding test for two fabric layers under the conditions of the transverse pressure was carried out. The parameters of friction are determined for the cases of textile-textile interfaces for different weaving types. It is obtained that the combination of fabrics of different weaving types can have the mutual static friction coefficient differing from the coefficients for each component up to 20%. Moreover, it can also differ from the averaged value of these two coefficients. For the higher values of the transverse compression the experimental equipment is proposed and designed for pulling out a textile layer from a free multilayer structure of fabrics under the conditions of controllable transverse compression loading. The numerical modelling of the load distribution in the tested fabric layer is accomplished which allows us to estimate the irregularity of the transverse pressure in the specimen and to correct the experimental results for friction coefficients. The transverse elastic modules used in these simulations were obtained separately by means of compression tests for the multilayer fabric samples. All the friction tests were carried out using Zwick/Roell 100 experimental device and the results are presented for various pulling rates and transverse loads. It is obtained that the pulling rate has a weak influence on the interface textile friction in the range of rates under consideration.