The role of damage-softened material behavior in the fracture of composites and adhesives

Ungsuwarungsri, T.; Knauss, W. G.

doi:10.1007/bf00015590

Cited by 121 publications

(68 citation statements)

References 17 publications

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“…In a CZM approach, used to model the progressive damage and failure, a predefined crack path has to be defined [114][115][116]. A CZM simulates the macroscopic damage along this path by specification of a traction-separation response between initially coincident nodes on either side of the predefined crack path.…”

Section: Damage Modellingmentioning

confidence: 99%

“…Generally, the parameters that describe the cohesive law are: the area under the traction-separation curve (the toughness) and a characteristic strength (typically, the cohesive strength) or a characteristic displacement that represents the failure strain of the cohesive zone. General tractionseparation laws for damage-softened composites and adhesives can be obtained from Ungsuwarungsri and Knauss [115].…”

Section: Damage Modellingmentioning

confidence: 99%

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Adhesively bonded joints in composite materials: An overview

Banea

Silva

2009

Proceedings of the Institution of Mechanical Engineers, Part L:

469

330

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A review of the investigations that have been made on adhesively bonded joints of fibre-reinforced plastic (FRP) composite structures (single skin and sandwich construction) is presented. The effects of surface preparation, joint configuration, adhesive properties, and environmental factors on the joint behaviour are described briefly for adhesively bonded FRP composite structures. The analytical and numerical methods of stress analysis required before failure prediction are discussed. The numerical approaches cover both linear and non-linear models. Several methods that have been used to predict failure in bonded joints are described. There is no general agreement about the method that should be used to predict failure since the failure strength and modes are different according to the various bonding methods and parameters, but progressive damage models are quite promising since important aspects of the joint behaviour can be modelled by using this approach. However, a lack of reliable failure criteria still exists, limiting in this way a more widespread application of adhesively bonded joints in principal load-bearing structural applications. An accurate strength prediction of the adhesively bonded joints is essential to decrease the amount of expensive testing at the design stage.

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Section: Damage Modellingmentioning

confidence: 99%

Section: Damage Modellingmentioning

confidence: 99%

Adhesively bonded joints in composite materials: An overview

Banea

Silva

2009

Proceedings of the Institution of Mechanical Engineers, Part L:

469

330

View full text Add to dashboard Cite

show abstract

“…Whilst different numerical techniques for cohesive-zone models have been well established; there still exists a need for the development of practical techniques that can be used to extract the relevant fracture parameters under different loading conditions. Numerical analyses using cohesive-zone models for adhesive layers bonding elastic adherends were first presented by Ungsuwarungsri and Knauss (1987), and Tvergaard and Hutchinson (1994;1996). Yang et al (1999) showed that it was possible to obtain two dominant cohesive parameters from mode-I experiments to characterize an adhesive layer in a plastically-deforming joint -the cohesive strength and toughness -and to use these values for quantitative predictions.…”

Section: Background and Motivationmentioning

confidence: 99%

Rate effects for mixed-mode fracture of plastically-deforming, adhesively-bonded structures

Sun

Thouless

Waas

et al. 2009

International Journal of Adhesion and Adhesives

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Mixed-mode fracture of an adhesively-bonded structure made from a commercial adhesive and a dual-phase steel has been studied under different rates. Since mixedmode fracture occurs along the interface between the steel and adhesive, the cohesiveparameters for the interface were required. The mode-II interfacial properties were deduced in earlier work. In this paper the mode-I interfacial toughness and the mode-I interfacial strength were determined at different rates. The mode-I interfacial strength was not affected by rate up to crack velocities at levels associated with impact conditions, and was essentially identical to the cohesive strength appropriate for crack growth within the adhesive layer. The mode-I toughness was reduced by about 40% when the crack propagated along the interface rather than within the adhesive. Furthermore, transitions to a brittle mode of failure occurred in a stochastic fashion, and were associated with a drop in interfacial toughness by a factor of about five. The mode-I interfacial parameters were combined with the previously-determined mode-II interfacial parameters within a cohesive-zone model to analyze the mixed-mode fracture of the joints which exhibited both quasi-static and unstable fracture. The mixed-mode model and the associated cohesive parameters for both quasi-static and unstable crack propagation provide bounds for predicting the behavior of the bonded joints under various rates of loading, up to the impact conditions that could be appropriate for automotive design. (August 15, 2008) 2

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“…A frequently used technique for studying debonding employs a cohesive zone model (CZM) ( Dugdale, 1960 ;Barenblatt, 1962 ;Ungsuwarungsri and Knauss, 1987 ;Xu and Needleman, 1995 ). In a CZM the interaction of adjoining points at an interface is phenomenologically represented by a spring of zero-length that softens after it has been extended by a prescribed value (reached a peak traction) and breaks at a pre-specified value of the extension (when the fracture energy criterion is met).…”

Section: Introductionmentioning

confidence: 99%

Effect of confinement and interfacial adhesion on peeling of a flexible plate from an elastomeric layer

Mukherjee

Batra

Dillard

2017

International Journal of Solids and Structures

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a b s t r a c tThe finite element method and a cohesive zone model are used to analyze plane strain interfacial debonding of an elastomeric layer from an overhanging deformable plate when it is peeled off by applying a normal displacement at the edge of the overhang. The commercial software, ABAQUS, is employed in this work that is focused on understanding the collective role of the following two non-dimensional parameters: (i) the confinement parameter, α, defined in terms of the flexural rigidity of the plate, and the modulus and the thickness of the interlayer, and (ii) the adhesion parameter, φ, defined in terms of the cohesive zone parameters and the modulus to thickness ratio of the interlayer. The interfacial adhesion is characterized by a bilinear traction-separation (TS) relation. Numerical experiments reveal that when α is greater than α c , damage initiates at an interior point on the interface and at the interface corner on the traction-free edge irrespective of the value of φ. However, φ must be greater than φ c for the debonding to become wavy/undulatory. The critical value, φ c , of the adhesion parameter agrees with the necessary condition found in our previous work on debonding of an elastomeric layer from a rigid block when it is uniformly pulled outward. For α < α c , damage/debonding initiates only from the interface corner, and no wavy debonding ensues. The peak peeling force prior to the initiation of an internal debond is found to be a monotonically increasing function of φ/ α, suggesting its potential use as a design variable and as a guide for determining the TS parameters. Results of a few additional numerical experiments in which the elastomeric layer can debond from both adherends provide insights into designing a demolding process for a sandwiched elastomeric layer.

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The role of damage-softened material behavior in the fracture of composites and adhesives

Cited by 121 publications

References 17 publications

Adhesively bonded joints in composite materials: An overview

Adhesively bonded joints in composite materials: An overview

Rate effects for mixed-mode fracture of plastically-deforming, adhesively-bonded structures

Effect of confinement and interfacial adhesion on peeling of a flexible plate from an elastomeric layer

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