Influence of curved delamination front on R-curve of DCB specimen

2019 ◽  
Vol 227 ◽  
pp. 111311 ◽  
Author(s):  
Zhengwen Jiang ◽  
Shui Wan ◽  
Thomas Keller ◽  
Zhi Fang ◽  
Anastasios P. Vassilopoulos
Keyword(s):  
Dcb Specimen ◽  
Delamination Front

Buckling analysis of a delaminated panel by using a kinematic global-local coupling approach

2014 ◽  
Vol 5 (4) ◽  
pp. 262-278
Author(s):  
A. Sellitto ◽  
R. Borrelli ◽  
F. Caputo ◽  
A. Riccio ◽  
F. Scaramuzzino
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Matrix Cracking ◽  
Composite Panel ◽  
Stiffened Panel ◽  
Local Approach ◽  
Content Type ◽  
Kinematic Coupling ◽  
Coupling Approach ◽  
Delamination Front

Purpose – The purpose of this paper is to investigate on the behaviour of a delaminated stiffened panel; the delamination growth is simulated via fracture elements implemented in B2000++® code based on the Modified Virtual Crack Closure Technique (MVCCT), matrix cracking and fibre failure have been also taken into account. Design/methodology/approach – In order to correctly apply the MVCCT on the delamination front a very fine three-dimensional (3D) mesh is required very close to the delaminated area, while a 2D-shell model has been employed for the areas of minor interest. In order to couple the shell domain to the solid one, shell-to-solid coupling elements based on kinematic constraints have been used. Findings – Results obtained with the global/local approach are in good correlation with those obtained with experimental results. Originality/value – The global/local approach based on kinematic coupling elements in conjunction with fracture elements allows to investigate and predict the behaviour of a stiffened delaminated composite panel in an efficient and effective way.

Controlled crack growth in ceramics: The DCB specimen loaded with pure moments

1996 ◽  
Vol 16 (9) ◽  
pp. 1021-1025 ◽  
Author(s):  
Bent F. Sørensen ◽  
Philippe Brethe ◽  
Peder Skov-Hansen
Keyword(s):  
Crack Growth ◽  
Dcb Specimen

scholarly journals Study on Fatigue Analysis of DCB Specimen Bonded

2012 ◽  
Vol 13 (7) ◽  
pp. 2865-2871 ◽  
Author(s):  
Hae-Kyu Choi ◽  
Soon-Jik Hong ◽  
Sei-Hwan Kim ◽  
Jae-Ung Cho
Keyword(s):  
Fatigue Analysis ◽  
Dcb Specimen

On the Double Cantilever Beam Specimen for Mode-I Interface Delamination

1994 ◽  
Vol 61 (2) ◽  
pp. 471-473 ◽  
Author(s):  
B. Balendran
Keyword(s):  
Shear Stress ◽  
Cross Section ◽  
Double Cantilever Beam ◽  
Mode I ◽  
Beam Specimen ◽  
Double Cantilever Beam Specimen ◽  
Mixed Variational Principle ◽  
Interface Delamination ◽  
Dcb Specimen ◽  
Compliance Model

A compliance model is presented for a DCB specimen for mode-I interface delamination. The undelaminated part of the specimen is modeled by using Reissner’s mixed variational principle from which the rotation of the cross-section at the tip of the crack and the shear stress at the interface are evaluated. The results for a homogeneous beam with midplane crack are deduced and shown to be in better agreement with the experimental and finite element results than any of the existing models.

The Contact Problem at Delamination

1995 ◽  
Vol 62 (4) ◽  
pp. 989-996 ◽  
Author(s):  
A. E. Giannakopoulos ◽  
K.-F. Nilsson ◽  
G. Tsamasphyros
Keyword(s):  
Contact Problem ◽  
Plate Theory ◽  
Compressive Loading ◽  
Material Anisotropy ◽  
Intensity Factors ◽  
Finite Element Scheme ◽  
Contact Conditions ◽  
Delamination Buckling ◽  
Post Buckling ◽  
Delamination Front

The important phenomenon of delamination buckling is examined subjected to the condition of frictionless contact. Buckled delamination is examined in particular, because in-plane compressive loading is typical and detrimental. Two types of contact can be distinguished, local and global. The latter may occur everywhere in the plate while the local contact is limited to the crack front (negative KI stress intensity factors). Both local and global contact conditions were considered using a finite element scheme which employed nonlinear plate theory. The global contact problem is formulated as it appears in post-buckling of delamination. The case of simultaneous buckling and contact is also addressed in this paper. Two particularly interesting examples of thin film delaminations are presented. In the first, the contact at buckling is due to the material anisotropy. In this case the bucking load and the post-bucking analysis were very well supported by experiments. In the second example, contact at buckling arises because of a pin that holds down the delaminated layer at its center. The treated cases indicated that contact may significantly affect the fracture parameters along the delamination front, and is, therefore, important for delamination arrest.

Finite element simulation of fast fracture in steel DCB specimen

1982 ◽  
Vol 16 (2) ◽  
pp. 157-175 ◽  
Author(s):  
T. Nishioka ◽  
S.N. Atluri
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Element Simulation ◽  
Dcb Specimen ◽  
Fast Fracture

Finite Element Simulation of Delamination in Carbon Fiber/Epoxy Laminate Using Cohesive Zone Model: Effect of Meshing Variation

2019 ◽  
Vol 964 ◽  
pp. 257-262
Author(s):  
Victor D. Waas ◽  
Mas Irfan P. Hidayat ◽  
Lukman Noerochim
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Cohesive Zone ◽  
Composite Laminate ◽  
Cohesive Zone Model ◽  
Critical Force ◽  
Zone Model ◽  
Interface Elements ◽  
Dcb Specimen ◽  
Carbon Fiber Epoxy

Delamination or interlaminar fracture often occurs in composite laminate due to several factors such as high interlaminar stress, stress concentration, impact stress as well as imperfections in manufacturing processes. In this study, finite element (FE) simulation of mode I delamination in double cantilever beam (DCB) specimen of carbon fiber/epoxy laminate HTA/6376C is investigated using cohesive zone model (CZM). 3D geometry of DCB specimen is developed in ANSYS Mechanical software and 8-node interface elements with bi-linear formulation are employed to connect the upper and lower parts of DCB. Effect of variation of number of elements on the laminate critical force is particularly examined. The mesh variation includes coarse, fine, and finest mesh. Simulation results show that the finest mesh needs to be employed to produce an accurate assessment of laminate critical force, which is compared with the one obtained from exact solution. This study hence addresses suitable number of elements as a reference to be used for 3D simulation of delamination progress in the composite laminate, which is less explored in existing studies of delamination of composites so far.

Effect of curved delamination front on mode-I fracture toughness of adhesively bonded joints

2015 ◽  
Vol 138 ◽  
pp. 73-91 ◽  
Author(s):  
Zhengwen Jiang ◽  
Shui Wan ◽  
Zhipeng Zhong ◽  
Shuqin Li ◽  
Kongjian Shen
Keyword(s):  
Fracture Toughness ◽  
Mode I ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Delamination Front

scholarly journals Analytical solution of some delamination scenarios in thick structural sandwich plates

2017 ◽  
Vol 21 (4) ◽  
pp. 1271-1315 ◽  
Author(s):  
András Szekrényes
Keyword(s):  
Finite Element ◽  
State Space Model ◽  
Sandwich Plates ◽  
Third Order ◽  
Element Analysis ◽  
The Core ◽  
Integral Distribution ◽  
Type Boundary ◽  
Delamination Front ◽  
Rectangular Sandwich Plates

The first-, second- and third-order shear deformation plate theories are applied in this work to model thick rectangular sandwich plates with through-width delamination. The models are based on the concept of the four equivalent single layers and the system of exact kinematic conditions. Three different scenarios are considered: the failure of the core, the delamination between the top facesheet and the core, and finally, the case when the delamination takes place in the local midplane of the top facesheet. A general model is derived and applied to sandwich plates with Lévy type boundary conditions. The governing equations are summarized and the state-space model of the system is created. The mechanical fields are calculated and compared to finite element results. The comparison shows that the first-order sandwich plate model is inaccurate, on the other hand, the second- and third-order theories capture very well the mechanical fields compared to finite element results. The J-integral distribution is also calculated along the delamination front and it is concluded that the third- and second-order models give very good approximations of the results by finite element analysis and the virtual crack closure technique.

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