Delamination Analysis of Tapered Composite Laminates using Cohesive Elements

Date

2018-12-01

Author

Dashatan, Saeid
Parnas, Kemal Levend
Çöker, Demirkan
Poorzeinolabedin, Mohsen

Metadata

Show full item record

Item Usage Stats

271
views

0
downloads

In this study, the initiation and propagation of delamination in tapered composite laminates are investigated using a finite element modelling with cohesive zone. The structural model with several drop-offs is assumed to be under tension. For this purpose, UD plies of 0-degree orientations are used for each sub-laminate. For a single step drop off, the results show that the delamination failure starts at the interface between ply drop-off and resin pocket. The next delamination generally starts either from the belt / resin pocket interface or the resin pocket / core sub-laminate interface. Depending on the parameters involved, it may propagate toward thin section and sometime thick section. The preliminary results show the progression of delaminations within various interfaces which are compatible with literature. © 2019 The Vertical Flight Society. All rights reserved.

Subject Keywords

Fatigue life, Damage tolerance, Micromechanics

URI

https://hdl.handle.net/11511/78949

Conference Name

7th Asian/Australian Rotorcraft Forum, ARF 2018

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Investigation of cell migration and proliferation in agarose based hydrogels for tissue engineering applications Vardar, Elif; Hasırcı, Nesrin; Hasırcı, Vasıf Nejat; Department of Biomedical Engineering (2010) Hydrogels are three dimensional, insoluble, porous and crosslinked polymer networks. Due to their high water content, they have great resemblance to natural tissues, and therefore, demonstrate high biocompatibility. The porous structure provides an aqueous environment for the cells and also allows influx of nutrients needed for cellular viability. In this study, a natural biodegradable material, agarose (Aga), was used and semi-interpenetrating networks (semi-IPN) were prepared with polymers having differen...
Numerical Aspects of POD-Based Reduced-Order Modeling forDarcy-Brinkman Equations Güler Eroğlu, Fatma; Kaya Merdan, Songül (2018-10-21) We propose, analyze and test a reduced order modelling with proper orthogonal decomposition (POD) method for the modeling to flows governed by double diffusive convection, which models flow driven by two potentials with different rates of diffusion. We present a theoretical analysis of the method and give results for various numerical tests on benchmark problems that will demonstrate both the theory and the effectiveness of the proposed method.
Contact mechanics of graded orthotropic coatings Arslan, Onur; Aksel, Mehmet Haluk; Dağ, Serkan; Department of Mechanical Engineering (2015) Analytic and computational studies are performed for contact problems of orthotropic functionally graded material (FGM) coatings which are bonded to isotropic homogeneous substrates without any interfacial defects. The orthotropic FGM coatings possess orhotrophic stiffness gradations through the coating thickness direction. The variations of each orthotropic stiffness constants are assumed to behave as exponential functions. In the analytical procedure, the problems of orthotropic graded coatings which are ...
Delamination analysis by using cohesive interface elements in laminated composites Gözlüklü, Burak; Parnas, Kemal Levend; Department of Mechanical Engineering (2009) Finite element analysis using Cohesive Zone Method (CZM) is a commonly used method to investigate delamination in laminated composites. In this study, two plane strain, zero-thickness six-node quadratic (6-NQ) and four-node linear (4-NL) interface elements are developed to implement CZM. Two main approaches for CZM formulation are categorized as Unified Mode Approach (UMA) and Separated Mode Approach (SMA), and implemented into 6-NQ interface elements to model a double cantilever beam (DCB) test of a unidir...
Elastoplastic analysis of nonlinearly hardening variable thickness annular disks under external pressure Eraslan, Ahmet Nedim; Guven, U (Elsevier BV, 2005-05-01) Based on von Mises' yield criterion, deformation theory of plasticity and Swift's hardening law, elasto-plastic deformation of variable thickness annular disks subjected to external pressure is studied. A nonlinear shooting method using Newton's iterations with numerically approximated tangent is designed for the solution of the problem. Considering a thickness profile in the form of a general parabolic function, the condition of occurrence of plastic deformation at the inner and outer edges of the annular ...

Citation Formats

S. Dashatan, K. L. Parnas, D. Çöker, and M. Poorzeinolabedin, “Delamination Analysis of Tapered Composite Laminates using Cohesive Elements,” presented at the 7th Asian/Australian Rotorcraft Forum, ARF 2018, Jeju Island; South Korea, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78949.