Analytical, numerical and experimental solutions of a cracked finite strip

Modeling of intersonic delamination in curved and thick composite laminates under quasi-static loading Gözlüklü, Burak; Çöker, Demirkan; Department of Aerospace Engineering (2014) One of the widely used geometrically complex parts in advanced commercial aircraft is L-shaped composite laminates in which mixed-mode delamination failure is reported. Dynamic delamination under quasi-static loading is studied using explicit finite element method in conjunction with Cohesive Zone Modeling (CZM). A 4-noded interface element working with Bilinear (BL), Xu-Needleman (XN) and ratedependent bilinear (RD) CZMs are implemented in ABAQUS/Explicit. The interface elements are validated with benchmar...
Analytical and numerical solutions to rotating orthotropic disk problems Kaya, Yasemin; Eraslan, Ahmet Nedim; Department of Engineering Sciences (2007) Analytical and numerical models are developed to investigate the effect of orthotropy on the stress distribution in variable thickness solid and annular rotating disks. The plastic treatment is based on Hill’s quadratic yield criterion, total deformation theory, and Swift’s hardening law. The elastic-plastic stress distributions, residual stresses and radial displacement distributions are obtained after having analysed the cases of rotating solid disk, annular disk with rigid inclusion, annular disk subject...
Fatigue and static behavior of curved composite laminates Taşdemir, Burcu; Çöker, Demirkan; Department of Aerospace Engineering (2018) By virtue of the fact that curved composite laminates which are utilized as load carrying subcomponents in aircraft and wind turbine structures are subjected to cyclic loading during their operating time, it is crucial to understand fatigue failure mechanisms at least as much as static failure mechanisms. With the intention of understanding fatigue failure mechanisms and thus improving fatigue life of structures, these curved laminates are investigated experimentally under static and fatigue loadings. The f...
Experimental investigation of dynamic delamination in curved composite laminates Uyar, İmren; Çöker, Demirkan; Department of Aerospace Engineering (2014) In the aerospace industry, high demand for lightweight structures is fostering the use of composite laminates in a wide variety of shapes, as primary load carrying elements. However, once a composite laminate takes a highly curved shape, such as an L-shape, high interlaminar stresses induced in the curved region causes dynamic delamination formation. This thesis discusses the experimental investigation of delamination in L-shaped CFRP composite laminates under quasi-static shear loading. An experimental set...
Nonlinear fiber modeling of steel-concrete partially composite beams with channel shear connectors Öztürk, Alper; Baran, Eray; Department of Civil Engineering (2017) The purpose of this study is to develop a nonlinear fiber-based finite element model of steel-concrete composite beams. The model was developed in OpenSees utilizing the available finite element formulations and the readily available uniaxial material constitutive relations. The model employed beam elements for the steel beam and the concrete slab, while zero-length connector elements were used for the steel-concrete interface. The channel shear connector response used in numerical models was based on the p...

Citation Formats

M. Yetmez, “Analytical, numerical and experimental solutions of a cracked finite strip,” Ph.D. - Doctoral Program, Middle East Technical University, 2002.