Modeling of Internal Geometric Variability and Statistical Property Prediction of Braided Composites

Abstract

Due to the advantages of high specific strength, specific stiffness, and excellent fatigue resistance, carbon fiber reinforced braided composites have been widely applied in engineering. Since the molding process of braided composites is complex and immature, substantial variability of the internal geometry exists in composites, in which the yarn path with uncertainty is a main factor, so it is necessary to establish an uncertainty model to study the influence of randomness of the yarn path on mechanical properties, which is significantly related to the fatigue resistance properties of composite. An uncertain mesoscopic model with uniform distribution of yarn paths is proposed. Assuming the yarn path is spatially varying in interval range, the variability of yarn path is represented geometrically in the unit cell of composite. The three-dimensional coordinates of the yarn trajectory are calculated, the meso-uncertainty models of 2-D and 2.5-D braided composites are established. The equivalent elastic parameters and the thermal expansion coefficients are obtained by applying homogenization method and temperature field boundary conditions to the mesoscopic model. The effect of yarn path uncertainty on the statistical characteristics of elastic and thermal parameters of braided composites was studied by using Monte-Carlo simulation. A simulation method for modeling yarn path uncertainty of braided composites is provided in this paper for predicting the statistical characteristics of the equivalent elastic and thermal parameters.

Fatigue and Fracture Behavior of Composite Materials

“…In the present Special Issue, the contributions can be divided into different topics: those aimed at modelling the composite behaviour [1,2], those aimed at evaluating the material response via classic [3,4] and innovative methodologies involving the use of experimental techniques [5][6][7], and one focused on presenting new functions for composite repair [8].…”

“…The role of the modelling of mechanical behaviour is crucial for defining those variables affecting the fatigue and fracture mechanics behaviour. In the work of Li et al [1], accounting for the complexity of the moulding process of braided composites producing a variability of the internal geometry (yarn path with uncertainty), that in turn affects the fatigue-resistance properties, an uncertainty modelling method was proposed to investigate the influence of the randomness of the yarn path on mechanical properties. The statistical characteristics of the equivalent elastic and thermal parameters were predicted using a combined approach: software simulation and finite element analysis software.…”

Damage Monitoring of Braided Composites Using CNT Yarn Sensor Based on Artificial Fish Swarm Algorithm

“…As an advanced composite material, three-dimensional (3D)-braided composites have become important structural materials used in the aviation and aerospace fields due to their high specific strength, high specific modulus, high damage tolerance, and other excellent properties [ 1 , 2 ]. Moreover, 3D composites have complex fiber structures.…”