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
Effect of thickness and pre-crack length on delamination of unidirectional l-shaped laminated composites
Date
2012-12-01
Author
Gozluklu, Burak
Yavas, Denizhan
Çöker, Demirkan
Metadata
Show full item record
Item Usage Stats
164
views
0
downloads
Cite This
It is widely assumed that delamination initiates at the curved region of the Lshaped laminate leading to loss of loading carrying capacity. However, as shown in this paper, under certain conditions a second failure mode in thick L-shaped laminates is observed in which a secondary crack initiates at the arm region. Delamination in L-shaped laminates is modeled using dynamic (explicit) finite element analysis in conjunction with cohesive zone methods. The 2-D model consists of 24 plies of unidirectional CFRP laminate with an initial crack at the center of curved region. Loading is applied parallel to one arm quasi-statically and the observed delamination occurs dynamically. Moreover a sequential analysis with implicit method followed by explicit is used for the sake of efficient computational analysis. For thicker L-shaped laminates with an initial crack at the center of curved region, formation of secondary crack in the arm region is observed. After the length of the initial crack reaches a critical value, initial crack at the curved region starts propagating. Therefore the size of the initial crack at the center of the curved region mainly decides the failure mode. The failure at the initial crack is under opening stresses whereas the failure due to secondary crack is under shear stresses. In addition, the change of the failure mode from the failure at the initial crack to failure due to secondary crack result in a decrease of the maximum load that the L-shaped laminate can resist. Thus the assumption of failure at the initial crack leads to the underestimation of failure load in the load displacement curve.
Subject Keywords
Cohesive element method
,
Composite materials
,
Delamination
,
Failure
,
Finite element analysis
,
L-shaped laminate
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84871633983&origin=inward
https://hdl.handle.net/11511/83554
Conference Name
6th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS (2012)
Collections
Department of Aerospace Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Effect of lay-up orientation on fracture toughness of CFRP laminates
Yavuz, Burak Ogun; Çöker, Demirkan; Parnas, Kemal Levend (2018-12-01)
Delamination in advanced composites, which causes reduction in the laminate strength, has been a continuing problem. Since it is relatively easier to manufacture, the general practice for the fracture toughness is to conduct tests with 0//0 interface and use these experimental values in the analyses. However, the fracture toughness values are known to vary for different angle interfaces. This happens to be a significant issue in the case of impact. When interlaminar properties of only 0//0 interface is used...
Effect of resin and fiber on the abrasion, impact and pressure resistance of cylindrical composite structures
Kaya, Derya; Yılmazer, Ülkü; Department of Chemical Engineering (2011)
The aim of this study was to investigate the effects of resin and fiber on the abrasion, impact and internal pressure resistances of fiber reinforced plastic composite pipes produced by continuous filament winding method. For this study, pipe samples were produced with different combinations of resin type, fiber type, fiber amount and fiber length. All the samples were tested in accordance with the related ISO (International Organization for Standardization), DIN (German Standardization Institution) and BSI...
EFFECT OF POROSITY ON INTERFACIAL FAILURE IN STEEL-FIBER-REINFORCED POLYMER-IMPREGNATED CONCRETE
Gündüz, Güngör (Elsevier BV, 1988-01-01)
The interfacial bond between a steel fibre and concrete generally increases with the polymer content. Naphthalene used to generate new pores in order t increase the polymer loading and thus to increase the interfacial bond strength has a positive effect up to 3% by weight. Higher amounts weaken the cementitious phase and also decrease the amount of polymer incorporated. Drying of concrete before impregnation at 150°C rather than at 105°C increases the polymer loading and thus the interfacial bond strength. ...
Effect of hardening models on different ductile fracture criteria in sheet metal forming
Dizaji, Shahram Abbasnejad; Darendeliler, Haluk; KAFTANOĞLU, BİLGİN (2016-07-01)
Prediction of the fracture is one of the challenging issues which gains attention in sheet metal forming as numerical analyses are being extensively used to simulate the process. To have better results in predicting the sheet metal fracture, appropriate ductile fracture criterion (DFC), yield criterion and hardening rule should be chosen. In this study, the effects of different hardening models namely isotropic, kinematic and combined hardening rules on the various uncoupled ductile fracture criteria are in...
Effect of hole reinforcement on the buckling behaviour of thin-walled beams subjected to combined loading
Orun, Arif E.; GÜLER, MEHMET ALİ (2017-09-01)
In this study, the effect of hole reinforcement on the buckling behaviour of thin-walled structures mostly used in aircrafts is investigated under combined loads. A fuselage floor beam with real dimensions is used for the buckling analysis, and a parametric study based on several loading scenarios is considered. Investigated structures include different ratios of hole diameter to reinforcement width (d/w), ratios of reinforcement height to web plate thickness (h/t), and the aspect ratio of the web plate (a/...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
B. Gozluklu, D. Yavas, and D. Çöker, “Effect of thickness and pre-crack length on delamination of unidirectional l-shaped laminated composites,” Vienna, Austria, 2012, p. 7060, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84871633983&origin=inward.