Mechanical Behavior of Circular Hybrid Braids Under Tensile Loads

In this work, the mechanical behavior of hybrid circular braids without a core under tensile loads is studied experimentally and analytically. A predictive model of the mechanical response of the braids based on the constituent yarn characteristics and machine parameters is developed. The structural geometry of the fabric is analyzed and used to build the mechanical model. Image analysis is employed to experimentally characterize the structural parameters of the braids, their deformation, and the braid and crimp angles of the yarps. Hybrid braids with two different yarn systems are manufactured at various braid angles. The structures are tested in tension and their strain response is recorded. Experimental results are compared to theoretical values, and the model predic tions have good accuracy. In the case of high braid angles, the theoretical model underestimates the strength of the fabric.