An explicit cohesive element combining cohesive failure of the adhesive and delamination failure in composite bonded joints

Published on Jun 1, 2016in Composite Structures5.138
· DOI :10.1016/J.COMPSTRUCT.2016.03.009
J. Neumayer2
Estimated H-index: 2
(TUM: Technische Universität München),
H. Koerber7
Estimated H-index: 7
(TUM: Technische Universität München),
Roland Hinterhölzl13
Estimated H-index: 13
(TUM: Technische Universität München)
Sources
Abstract
Abstract Delaminations can change the mechanical behaviour of bonded joints significantly in crash simulations. A cohesive element is presented that enables the simulation of delamination failure in bonded joints on a full scale structural level. The principle of the approach is to compute the through thickness stresses of the adherends analytically within the cohesive element representing the cohesive behaviour of the complete adhesive. Via a stress based interaction criterion it becomes possible to detect delamination in the adherends. The delamination failure is implemented by an adaptation of the cohesive law. The new cohesive element is validated numerically by a single lap joint geometry. The results show good correlation with a conventional cohesive zone modelling when cohesive failure of the adhesive occurs. It can well predict the delamination initiation and approximates the joint strength conservatively. The convergence behaviour of the model is improved. The numerical efficiency is high and enables a representation of both cohesive failure of the adhesive and delamination failure on a structural level.
📖 Papers frequently viewed together
3 Citations
11 Citations
2014
1 Author (D.C. Noorman)
5 Citations
References20
Newest
#1J. Neumayer (TUM: Technische Universität München)H-Index: 2
#2P. Kuhn (TUM: Technische Universität München)H-Index: 1
Last. Roland Hinterhölzl (TUM: Technische Universität München)H-Index: 13
view all 4 authors...
A robust analysis of adhesively bonded joints requires valuable input data for simulation. Mechanical properties of adhesives in tensile and shear directions at high deformation rates are necessary, particularly for crash scenarios. Butt joint specimens and lap shear specimens were, therefore, tested under impact loading using a tensile split Hopkinson bar (SHB). In this study, the adhesive deformation was measured using a high-speed camera and digital image correlation (DIC). The method was com...
18 CitationsSource
#1Raul D.S.G. Campilho (Universidade Lusófona)H-Index: 42
#2Mariana D. Banea (Faculdade de Engenharia da Universidade do Porto)H-Index: 33
Last. L.F.M. da Silva (Faculdade de Engenharia da Universidade do Porto)H-Index: 24
view all 4 authors...
Abstract Adhesively-bonded joints are extensively used in several fields of engineering. Cohesive Zone Models (CZM) have been used for the strength prediction of adhesive joints, as an add-in to Finite Element (FE) analyses that allows simulation of damage growth, by consideration of energetic principles. A useful feature of CZM is that different shapes can be developed for the cohesive laws, depending on the nature of the material or interface to be simulated, allowing an accurate strength pred...
295 CitationsSource
#1J.A.B.P. Neto (University of Porto)H-Index: 1
#2Raul D.S.G. Campilho (Universidade Lusófona)H-Index: 42
Last. L.F.M. da Silva (University of Porto)H-Index: 44
view all 3 authors...
Abstract Adhesively-bonded joints are increasingly used in aeronautical industry. Adhesive joints permit to join complex shapes and reduce the weight of structures. The need to reduce the weight of airplanes is also increasing the use of composites. Composites are very anisotropic: in the fibre directions, unidirectional composites can be very strong and stiff, whereas the transverse and shear properties are much lower. Bonded joints experience peel loading, so the composite may fail in transver...
136 CitationsSource
#1Ramadan A. Esmaeel (Dal: Dalhousie University)H-Index: 9
#2Farid Taheri (Dal: Dalhousie University)H-Index: 30
Abstract Tubular adhesively bonded joints are widely used in many industries such as the oil-and-gas, aerospace and automotive. Such joints are often used to mate dissimilar materials. Composite materials, because of their superior specific strength and stiffness and high resistance to corrosion, have also been widely used to form tubular components. When composites are mated to other materials (such as metals) by adhesives, the stress concentration in the adhesive layer becomes even more exaspe...
19 CitationsSource
A broad finite element study was carried out to understand the stress fields and stress intensity factors behavior of cracks in adhesively bonded double-lap joints, which are representative of loading in real aerospace structures. The interaction integral method and fundamental relationships in fracture mechanics were used to determine the mixed-mode stress intensity factors and associated strain energy release rates for various cases of interest. The numerical analyses of bonded joints were als...
26 CitationsSource
#1S. K. Panigrahi (North Eastern Regional Institute of Science and Technology)H-Index: 12
#1Simanchalo Panigrahi (North Eastern Regional Institute of Science and Technology)H-Index: 24
Last. B. Pradhan (IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 14
view all 2 authors...
Three-dimensional non-linear finite element analyses have been carried out to study the effects of through-the-width delaminations on delamination damage propagation characteristics in adhesively bonded single-lap laminated FRP composite joints. The delaminations have been presumed either to pre-exist or to get evolved due to coupled stress failure criteria in the laminated FRP composite adherends near the overlap ends beneath the ply adjacent to the overlap region. The out-of-plane stresses in ...
32 CitationsSource
#1Thomas Carlberger (Saab Automobile AB)H-Index: 7
#2K. Svante Alfredsson (University of Skövde)H-Index: 4
Last. Ulf Stigh (University of Skövde)H-Index: 19
view all 3 authors...
The potential of adhesive bonding to improve the crashworthiness of cars is attracting the automotive industry. Large-scale simulations are time consuming when using the very small finite elements needed to model adhesive joints using conventional techniques. In the present work, a 2D-interphase element formulation is developed and implemented in an explicit FE-code. A simplified joint serves as a test example to compare the interphase element with a straightforward continuum approach. A compari...
14 CitationsSource
#1Carlos G. DavilaH-Index: 33
#2Pedro P. CamanhoH-Index: 70
Last. Albert TuronH-Index: 28
view all 3 authors...
Abstract A cohesive element for shell analysis is presented. The element can be used to simulate the initiation and growth of delaminations between stacked, non-coincident layers of shell elements. The procedure to construct the element accounts for the thickness offset by applying the kinematic relations of shell deformation to transform the stiffness and internal force of a zero-thickness cohesive element such that interfacial continuity between the layers is enforced. The procedure is demonst...
22 Citations
#1Suyi Li (UM: University of Michigan)H-Index: 21
#2M.D. Thouless (UM: University of Michigan)H-Index: 55
Last. Pablo D. Zavattieri (GM: General Motors)H-Index: 37
view all 5 authors...
In this paper, the use of cohesive-zone models to analyze crack-path selection in adhesive joints made from a polymer-matrix composite is demonstrated. Cohesive-zone parameters for the adhesive and composite obtained in a previous work were used without any modifications to make the predictions presented in this study. The results of numerical simulations of two mixed-mode geometries, single-lap shear and asymmetrical double-cantilever beam specimens, are compared to experimental observations. I...
34 CitationsSource
#1Albert Turon (University of Girona)H-Index: 28
#2Pedro P. Camanho (University of Porto)H-Index: 70
Last. Carlos G. Davila (LaRC: Langley Research Center)H-Index: 33
view all 4 authors...
A thermodynamically consistent damage model is proposed for the simulation of progressive delamination in composite materials under variable-mode ratio. The model is formulated in the context of Damage Mechanics. A novel constitutive equation is developed to model the initiation and propagation of delamination. A delamination initiation criterion is proposed to assure that the formulation can account for changes in the loading mode in a thermodynamically consistent way. The formulation accounts ...
616 CitationsSource
Cited By11
Newest
#1L.D.C. Ramalho (National Institute of Statistics and Geography)H-Index: 4
#2I.J. Sánchez-Arce (National Institute of Statistics and Geography)H-Index: 1
Last. Jorge Belinha (International Student Exchange Programs)H-Index: 22
view all 4 authors...
Abstract This work applies a meshless method, the Natural Neighbours Radial Point Interpolation Method (NNRPIM), to a multi material structure composed of an anisotropic material, the composite substrates, and an isotropic material, the adhesive bonding the substrates. The strength predictions in this work were made using a recent continuum mechanics based criterion, the Critical Longitudinal Strain (CLS) criterion. The validity of the NNRPIM in this type of problem was proven by comparing it to...
Source
#1Rfn Brito (ISEP: Instituto Superior de Engenharia do Porto)
#2Rdsg Campilho (ISEP: Instituto Superior de Engenharia do Porto)H-Index: 11
Last. I.J. Sánchez-Arce (National Institute of Statistics and Geography)H-Index: 1
view all 4 authors...
Adhesive bonding is a predominant bonding technique in the aeronautical and automotive industries. Cohesive zone models, used together with the finite element method, are a viable tool to predict t...
Source
#1Marco Gaiotti (UniGe: University of Genoa)H-Index: 5
#2Albert ZamarinH-Index: 4
Last. Tin MatuljaH-Index: 5
view all 4 authors...
Abstract One of the key issues concerning the use of composite materials in the construction of steel ships, or vice versa, the use of steel in the construction of composite ships, is related to the ways of joining composite parts to the adjacent steel structure. Carbon-steel joints are of increasing interest for the maritime industry, but knowledge is scarce. Applications of adhesive joints as an alternative method to welding or riveting has numerous advantages. Still, gathering more informatio...
2 CitationsSource
#1L.D.C. Ramalho (University of Porto)H-Index: 1
#2I.J. Sánchez-Arce (National Institute of Statistics and Geography)H-Index: 1
Last. Francisco Silva (International Student Exchange Programs)H-Index: 25
view all 5 authors...
Abstract The applications of adhesive joints have grown in recent years in various industries, ranging from automotive to maritime. Compared to traditional joining techniques, such as bolts, welding or riveting, adhesive bonding has some advantages, namely, they are low weight, have high strength and have a more uniform stress distribution. However, they also have some disadvantages, many times they are impossible to disassemble, they have low peel strength and some adhesive require high curing ...
1 CitationsSource
#1L.D.C. Ramalho (University of Porto)H-Index: 1
#1L.D.C. Ramalho (National Institute of Statistics and Geography)H-Index: 4
Last. L.F.M. da Silva (University of Porto)H-Index: 44
view all 4 authors...
Abstract The use of adhesive joints has gathered increasing interest in recent years due to their advantages over conventional bonding techniques, namely lighter structures and decreased stress concentrations. Consequentially, the strength prediction of adhesive joints has been studied extensively. This review aims to describe and compare the most relevant methods for the strength prediction of adhesive joints. These methods can be divided into analytical and numerical methods. Analytical method...
23 CitationsSource
#1Hao Long (CAS: Chinese Academy of Sciences)H-Index: 4
#2L. H. Liang (CAS: Chinese Academy of Sciences)H-Index: 15
Last. Yueguang Wei (PKU: Peking University)H-Index: 17
view all 3 authors...
Abstract Cohesive zone models have been widely used to model interface crack initiation and propagation both in single-material media and bi-material systems. For single-material media with cohesive elements inserted into interface among segments, in order to ensure that the introduction of interface cohesive zone models does not affect the mechanical properties of single-material media before the softening stage of cohesive zone models, a selection criterion of stiffness of cohesive elements is...
7 CitationsSource
#1Makoto Imanaka (UEW: University of Education, Winneba)H-Index: 13
#2Masaki Omiya (Keio: Keio University)H-Index: 13
Last. Noriaki TaguchiH-Index: 1
view all 3 authors...
AbstractIn this study, the tensile shear and bending tests of adhesively bonded single lap joints with the acrylic adhesive was evaluated experimentally and numerically. In the previous paper, the ...
2 CitationsSource
#1Eduardo Marques (National Institute of Statistics and Geography)H-Index: 5
#2Alireza Akhavan-Safar (National Institute of Statistics and Geography)H-Index: 10
Last. Lucas F. M. da Silva (University of Porto)H-Index: 27
view all 5 authors...
Adhesive bonding is a very flexible and efficient joining method which has been extensively adopted in applications where low structural weight and high mechanical performance is a required. However, the design process and strength prediction methods for bonded joints is still a topic where intensive research is being carried out, especially when taking into consideration the recent advances in adhesive formulations. Several methods, both analytical and numerical, are currently available for acc...
3 CitationsSource
#1Jinxin Ye (Beihang University)H-Index: 4
#2Ying Yan (Beihang University)H-Index: 14
Last. Ziyang Tian (Beihang University)H-Index: 4
view all 5 authors...
Abstract The tensile failure behavior in adhesive-bonded composite single-lap joints with different overlap lengths is investigated through experiments and various three-dimensional (3D) explicit finite element methods (FEMs). Different failure modes are observed in different overlap lengths. Three parameterized finite element models are developed to discuss the accuracy and applicability of the 3D explicit FEMs based on different modeling strategies and improved failure criteria. All criteria a...
19 CitationsSource
#1Xu Yangjian (Zhejiang University of Technology)H-Index: 4
#2Guo Yuanqi (Zhejiang University of Technology)H-Index: 1
Last. Xiaogui Wang (Zhejiang University of Technology)H-Index: 4
view all 5 authors...
Abstract It has been proven that the shape effect of different cohesive laws can not be ignored in many cases. Such an effect is further investigated and clarified in the present paper. In order to more accurately simulate the adhesive failures of composite structures, it is necessary to develop a unified cohesive zone model (CZM) capable of approaching an arbitrary existing cohesive law. Toward this end, an improved interpolation-based CZM (ICZM) has been developed. The parameters of such a mod...
8 CitationsSource