A Damage Model Reflecting the Interaction between Delamination and Intralaminar Crack for Failure Analysis of FRP Laminates

Abstract

In this paper, a progressive damage model reflecting the interaction between delamination and intralaminar crack is developed to predict fracture behaviors and the ultimate load-bearing ability of the fiber-reinforced polymer laminates subject to quasi-static load. Initiation and evolution of intralaminar crack in composites are modeled using a continuum damage mechanics model, which has the capability to reliably predict the discrete crack direction by introducing the crack direction parameter while analyzing the multi-failure of FRP composites. Delamination is modeled using a cohesive zone method with the mixed bilinear law. When the continuum damage model and cohesive zone model are used together, the interactive behavior between multiple failure mechanisms such as delamination induced by matrix cracking often seen in the failure of composite laminates is not generally captured. Interaction between delamination and intralaminar crack in FRP composite structures is investigated in detail and reflected in a finite element analysis in order to eliminate the drawbacks of using both models together. Good agreements between numerical results and experimental data are obtained.

Topology optimization of adhesive material in a single lap joint using an evolutionary structural optimization method and a cohesive zone model as failure criterion

“…The stress values in the region subject to failure can be obtained through equations (2) and (3) where the damage factor, D m, represents the loss of material stiffness, as shown in the graph in Figure 1. The normal and tangential components of the stresses acting in the region subject to fracture, are calculated using the following equations: 12,13,21 where T n and T t are the normal and tangential stresses on the cohesive surface at the point considered; δ n 0.25em and δ t are the normal and tangential displacements of surfaces at this point; K n and K t are the stiffnesses given by T i m a ´ x / δ i *; T i m a ´ x and δ i * are the values of the maximum stresses, at the beginning of the failure process, to shear and normal, and the displacement of surfaces, in this situation, respectively; and D m corresponds to the damage parameter in mixed mode, according to the bilinear CZM model. It represents the loss of material stiffness, as shown in the gra...…”

“…The β factor corresponds to a weighting parameter of the relative influence of these stresses in the collapse process. 12,13,19 In this study, it was obtained through calibration of the numerical model based on the geometric and material parameters of the SLBJ. The model was used to solve two types of adhesives, according to data presented in item 3.…”

“…They also performed numerical simulations and comparisons with experimental results. Yun et al 13 conducted research focused on analyzing the behavior of laminates using a progressive damage prediction model in which the material was subjected to quasi-static loading. The condition of progressive collapse was simulated using the CZM theory in a mixed damage mode, using bilinear behavior.…”

Investigation on Mode I Fracture Toughness of Woven Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials

“…Due to the various advantages of FRP materials, they are globally used in various engineering fields [1][2][3][4]. However, from a mechanical viewpoint, FRP composites show complex failure modes such as matrix cracking, fiber rupture, and interlaminar delamination; therefore, their performance is limited [5][6][7][8][9][10]. Particularly, interlaminar delamination, which is usually attributed to shear or tensile cracking at the interfaces of FRP layers, is one of the most critical damage mechanisms.…”

Investigation on the Material Failure in a Small Scale Automotive Camera Module via Root Cause Analysis and Experimental Validation

“…A number of contributions related to the failure issues and fracture behaviors for automotive components have been reported recently. To predict fracture behaviors and the ultimate loadbearing ability of the fiber-reinforced polymer laminates used in automotive components, Yun et al developed a progressive damage model to reflect the interaction between delamination and intralaminar crack [6]. Witek et al performed the failure and stress analysis of the connecting rod of turbocharged diesel engine using advanced finite element method and experimental validation [7].…”