Flexural strength of delaminated composite plate – An experimental validation

Abstract

In the present work, the flexural strength of delaminated composite plate has been analysed numerically and compared with experimental results. For the numerical investigation, a general mathematical model of the laminated composite plate with and without delamination has been developed using two higher-order kinematic models. The desired governing equation is obtained using variational approach and discretised with the help of the isoparametric finite element steps. The flexural responses of the delaminated structure computed numerically through a generic in-house computer code developed in MATLAB environment. The consistency of the developed numerical models is checked and validated by comparing the bending responses with the available published results. Now, the experimental bending responses of both intact and delaminated composites are evaluated using three-point bend test and compared with numerical responses of the presently developed higher-order models. Finally, the effect of different materials and geometrical parameters including the size, location and position of the delamination on the bending behaviour of the laminated composite plate have been analysed numerically and discussed in detail.

Differences of transverse impact damages in 3D angle-interlock woven composites between warp and weft directions

“…The delamination is attributed to the mismatching of the matrix and yarn stiffness and the inter-laminar shear stresses (Hirwani et al., 2018). Figure 14 shows the shear stress contour of matrix.…”

Multi-Layer Advanced Fibre Hybridisation (Glass-Carbon-Kevlar) and Variable Stiffness Influence on Composite Structure Responses (Stress and Deformation): An FE Approach

“…where, [K] and {F} are the global system stiffness matrix and load vectors, respectively. The detailed expression for obtaining bending deflection and bending stress can be referred from Hirwani et al [36].…”

“…Xiao et al [34] analysed static infinitesimal deformations of thick laminated composite elastic plates using a higher-order shear and normal deformable plate theory (HOSNDPT) via a meshless method under different support conditions. The influence of delamination on the flexural responses has also been investigated in detail by numerous researchers [35,36]. The commercial FE tools such as ANSYS have been utilized by various researchers to study the free vibration responses of laminated composite intact [37] as well as damaged beams [38] and hybrid laminates [39].…”

Failure analysis of delaminated carbon/epoxy composite under pure bending: validation with numerical analysis

“…Some researchers investigated experimentally to know the behaviour of delaminated FRP composites subjected to pure bending (Gong et al , 2016; Kinawy et al , 2012; Kopparthi et al , 2020b) and three-point bending (Bondyra et al , 2012; Sahoo et al , 2015; Hirwani et al ., 2017, 2018; Dominik, 2019; Amaro et al , 2011; Yap et al , 2008; Guan et al , 2020; Kopparthi et al , 2020a). In pure bending, composite failure occurs due to delamination driven buckling (Kinawy et al , 2012) and local buckling increases with delamination growth (Gong et al , 2016; Kopparthi et al , 2020b).…”

“…In pure bending, composite failure occurs due to delamination driven buckling (Kinawy et al , 2012) and local buckling increases with delamination growth (Gong et al , 2016; Kopparthi et al , 2020b). The position of delamination also alters distribution of shear stress (Amaro et al , 2011) and flexural response of the FRP laminate (Hirwani et al , 2018; Amaro et al , 2011).…”