Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Experimental and numerical investigation of damage process in composite laminates under low-velocity impact
Download
index.pdf
Date
2016
Author
Topaç, Ömer Tanay
Metadata
Show full item record
Item Usage Stats
219
views
233
downloads
Cite This
Damage sensitivity of composites under out-of-plane dynamic loading, and its limited detectability on a structure has long remained a prominent problem in industry. In this study, simulations are compared with the real-time damage formation scheme, with the aim of increasing confidence in failure predictions. Drop-weight impact experiments are carried out on a [0/90]_s CFRP beam laminate. Initiation and progression of damage, consisting of matrix cracks and delamination, are visualized via ultra-high-speed camera at rates up to 60,000 fps and the sequence of failure events are captured. Evolution of dynamic strain fields is then quantified by a Digital Image Correlation (DIC) analysis and the resulting final failure patterns are characterized by a digital microscope. In the computational part, 3D finite element analysis is performed using ABAQUS/Explicit to simulate the experiments. Intraply matrix damage is modeled using a Continuum Damage Mechanics (CDM) based composite failure theory with LaRC04 initiation criterion and implemented via a user-written VUMAT subroutine. Delamination is modeled using cohesive interface elements introduced between 0°/90° interfaces. Damage initiation time, location and the interaction of failure modes and symmetry are compared with the experiments. The sequence of dynamic matrix cracking followed by dynamic delamination is observed for the first time. A good agreement between experimental and numerical results is achieved.
Subject Keywords
Composite materials.
,
Laminated materials.
,
Materials
,
Fracture mechanics.
URI
http://etd.lib.metu.edu.tr/upload/12619720/index.pdf
https://hdl.handle.net/11511/25405
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Progressive failure analysis of composite shells
Olcay, Yasemin; Darendeliler, Haluk; Department of Mechanical Engineering (2012)
The objective of this thesis is to investigate the progressive failure behavior of laminated fiber reinforced composite shell structures under different loading conditions. The laminates are assumed to be orthotropic and the first order shear deformation theory is applied. Three-node layered flat-shell elements are used in the analysis. To verify the numerical results obtained, experimental and analytical results found in literature are compared with the outputs of the study, and the comparison is found to ...
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...
Failure analysis of advanced composites under impact by cohesive zone method
Doğan, Oğuz; Parnas, Kemal Levend; Department of Mechanical Engineering (2013)
The main objective of this study is to investigate the delamination damage of laminated composites subjected to low velocity impact. Three-dimensional finite element analyses are conducted to determine delamination area, shape and location. The impact analysis is performed by using the explicit finite element method which uses the central difference rule to integrate the equations of motion through the time. The composite structures are modeled using eight-node solid elements. The critical interfaces betwee...
Assessment and modelling of particle clustering in cast aluminum matrix composites
Çetin, Arda; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2008)
The damage and deformation behaviour of particle reinforced aluminum matrix composites can be highly sensitive to local variations in spatial distribution of reinforcement particles, which markedly depend on melt processing and solidification stages during production. The present study is aimed at understanding the mechanisms responsible for clustering of SiC particles in an Al-Si-Mg (A356) alloy composite during solidification process and establishing a model to predict the risk of cluster formation as a f...
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...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Ö. T. Topaç, “Experimental and numerical investigation of damage process in composite laminates under low-velocity impact,” M.S. - Master of Science, Middle East Technical University, 2016.