Numerical investigations of microscopic characteristic influences on the mechanical properties of polymer‐matrix composites

Abstract

In this study, an isoparametric micro‐mechanical model is developed to study the failure behaviors under biaxial loadings for composites with different fiber arrangements. For validating the method, the numerical results of the unidirectional (UD) composite lamina with consideration of two different failure criteria (the constituent failure criterion and UD failure criterion) are compared with the experimental results. On this basis, the fiber arrangements and fiber off‐axis angles influence on the failure envelopes for the UD composite lamina are studied. Furthermore, the failure strength of a typical composite laminates is also investigated. The results show that the failure strength of composite laminates is closely dependent on the fiber arrangements. Compared with the hexagonal packing, the square diagonal packing provides the higher failure strengths. POLYM. COMPOS., 38:2734–2742, 2017. © 2015 Society of Plastics Engineers

Molecular dynamics study of toughening mechanisms in nano-composites as a function of structural arrangement of reinforcements

“…In 2D FE simulations of metal matrix composites with nonhardening matrix, it was found that for low fiber volume fractions (b0.4), hexagonal and square array gave similar strengths [40]. However for higher volume fractions (N0.4), the strength of the square array was much higher than hexagonal [41,42], and increased with increase in fiber volume fraction [42]. In comparison, results of the present study indicate that hexagonal, square and random arrays have similar strengths.…”

“…A few studies have been conducted on the influence of volume fraction on the mechanical properties of different structural arrangements [40][41][42]. In 2D FE simulations of metal matrix composites with nonhardening matrix, it was found that for low fiber volume fractions (b0.4), hexagonal and square array gave similar strengths [40].…”

Thermal cycling influences on compressive deformations of laminate composites

“…Moreover, two periodic arrangements, that is square edge packing and square diagonal packing (as shown in Ref. ), are considered. The results of the longitudinal thermal conductivity coefficient k 11 and transversal thermal conductivity coefficients k 22 or k 33 for AS4/3501–6 composites with respect to temperature variations are shown in Fig.…”

“…In recent years, composites, which are considered to be the attractive materials due to their high strength and stiffness, have been widely used in aerospace fields . Loading and environment variation effect on composites will lead to material aging, fatigue and crack, which may give rise to the failure of composite structures .…”

Auto-generation methodology of complex-shaped coarse aggregate set of 3D concrete numerical test specimen

“…Experimental [7][8] and theoretical methods [9][10] have been used to investigate the mechanical features and damage mechanisms of composite blades. However, for a heterogeneous material, it is difficult to reveal the intrinsic relations between its macroscopic and microscopic characteristics, such as fiber arrangements and fiber shape [11][12][13][14], by experimental methods. As a result, more and more researchers are using numerical methods to study their mechanical properties and optimally design composite wind turbine blades.…”