Numerical analysis of cracked aluminum plate repaired with multi-scale reinforcement composite patches

Abstract

In this study, numerical modeling is used to investigate the performance of a single-sided composite patch with different scale fillers, as reinforcement of a cracked aluminum plate under static tension. The main concerns of previous studies are about the geometry of patches, composite layups, and failure of adhesive. In this research, the effect of patch properties such as size and fiber volume fraction, the thickness of patch, and thickness of adhesive on the overall performance of the cracked aluminum plate are investigated numerically. Indeed, first, a 3 D representative volume element (RVE) is adopted to calculate the mechanical properties of carbon nanotube (CNT)/epoxy and carbon fiber (CF)/epoxy composite patch at each specified volume fraction for investigating the effect of patch properties on the performance of a single-sided patch for crack repairing. In this regard, the cohesive zone model is adopted to analyze the debonding between the epoxy matrix and reinforcement to characterize the mechanical properties of composite patches. Finally, a linear 3 D finite element analysis is performed to calculate the stress intensity factor (SIF) for cracked aluminum plate repaired by a single-sided composite patch at each specified reinforcement volume fraction for different thickness of patch and different thickness of adhesive. The results demonstrated that the stress intensity factor highly depends on the patch properties (patch stiffness) in addition to patch thickness and adhesive thickness.

Dynamic behaviors of composite leaf springs with viscoelastic cores

“…In the present study, carbon fiber/epoxy and E-glass/epoxy are selected as composite leaf spring; since these materials are the most common composite materials which are used to fabricate the leaf springs. The material properties (Pederson 2008;Al-Qrimli, Mahdi, and Ismail 2015;Oztoprak et al 2018;Yousefi, Mosavi Mashhadi, and Safarabadi 2020) of these materials are reported in Table 1.where in Table 1, q is the material density, and E 1 is the longitudinal modulus, E 2 , and E 3 are the transitive modulus. 12 and 23 are the in-plane and out-of-plane Poisson's ratios, respectively.…”

“…3. (Pederson 2008, Al-Qrimli, Mahdi, and Ismail 2015, Oztoprak et al 2018, Yousefi, Mosavi Mashhadi, and Safarabadi 2020 In order to determine the width and thickness of the composite leaf spring, the following equations are employed (Gebremeskel 2013):…”

Fatigue Life Improvement of Cracked Aluminum 6061-T6 Plates Repaired by Composite Patches

“…The FEM is an excellent technique to analyze the effect of different repair process parameters on the overall performance of structures repaired by polymer composite patches [ 8 , 9 , 14 , 15 , 16 , 17 , 18 , 19 ]. Calculating stress intensity factor (SIF) is a reliable approach to describing crack growth behavior [ 15 , 17 , 19 , 20 , 21 ]. Ouinas et al [ 15 ] studied the effect of the patch geometry and adhesive properties on the efficiency of the repair process.…”

“…Results indicated that the efficiency of the repair process firmly depends upon the parent plate thickness and patch material. Yousefi et al [ 19 ] studied the effect of composite and nanocomposite patch volume fraction on the performance of the repair process. They examined the impact of the patch and adhesive thickness on the efficiency of the repair process.…”

Fatigue Modeling and Numerical Analysis of Re-Filling Probe Hole of Friction Stir Spot Welded Joints in Aluminum Alloys

“…However, re-filling the probe hole has no considerable effect on the fatigue strength. Several recent studies [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] used different loading conditions and different viable approaches to investigate the tensile strength and fatigue life of joints and metallic structures.…”