Treatment of Unsymmetric Adhesively Bonded Composite Sandwich Panels-To-Flange Joints

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬, Farid; Zou, Guang Ping

doi:10.1080/15376490490269500

Cited by 23 publications

(6 citation statements)

References 27 publications

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“…Consideration of the coupling between the adhesive stresses results in excessively long expressions for the adhesive peel and shear stress functions. As a result, analytical treatments of unbalanced joints always end with the numerical solution to the stress functions (Renton and Vinson, 1977;Yuceoglu and Updike, 1980;Yang and Pang, 1996;Taheri and Zou, 2004). As mentioned earlier, work recently undertaken by the authors allows for evaluation of adhesive stresses in balanced as well as unbalanced joints of any configuration with remarkable accuracy, so long as the joint is of a single-interface between two adherends.…”

Section: Asymptotic Model Formulationmentioning

confidence: 97%

The strain energy release rates in adhesively bonded balanced and unbalanced specimens and lap joints

Shahin

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2008

International Journal of Solids and Structures

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a b s t r a c tAn analytical model is developed to determine the strain energy release rate in adhesive joints of various configurations such as the double-cantilever beam and single-lap joints. The model is based on asymptotic analysis of adhesive layer stresses and Irwin's crack closure integral. Closed-form solutions are presented for balanced and unbalanced joints under mode I, II and mixed-mode I/II that take into account the influence of the shear force on the adhesive stresses, and its influence on the strain energy release rate. The accuracy of the model is tested against the classical beam theory expressions for double-cantilever beam and end-notch flexure specimens. In fact, classical beam theory's expressions are found to be the lower bound of the proposed model solutions, and the two methods converge as the adhesive layer thickness decreases. Analysis of single-lap joints reveals the influence of edge shear forces on the total strain energy release rate, and more importantly on the ratio between modes I and II. Results from the proposed analytical model are in good agreement with finite element results and with analytical models found in the literature.

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Section: Asymptotic Model Formulationmentioning

confidence: 97%

The strain energy release rates in adhesively bonded balanced and unbalanced specimens and lap joints

Shahin

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2008

International Journal of Solids and Structures

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“…Zou et al presented a one-dimensional beam model for adhesively bonded balanced/unbalanced composite joints. [27,28] Luo et al proposed a one-dimensional beam model that considered large deflections and the transverse shear deformation of the adherends of composite SLJs. [29] There are many theoretical models for adhesively bonded SLJs in the aforementioned studies; however, there are extremely few models that can present both the peel 2 Z. Jiang et al…”

Section: Introductionmentioning

confidence: 99%

Two dimensional analysis for an adhesively bonded composite single-lap joint based on flexible interface theory

Jiang

Wan

Zhong

et al. 2015

Journal of Adhesion Science and Technology

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An improved two-dimensional model based on flexible interface theory is proposed for an adhesively bonded composite single-lap joint. In the modified model, the adherends are treated as a Timoshenko beam, and the adhesive layer is assumed to be an Euler-Bernoulli beam. The peel stress and shear stress across the adhesive thickness varied. Additionally, the zero shear stress condition at the free end of the adhesive layer was satisfied. Based on the displacement compatibility condition of a flexible interface, the governing differential equations for the internal forces are derived. The stress distributions of the adhesive layer can be obtained by solving the governing differential equations. A comparison of the results between the modified model, existing classical models, and finite element results indicate that the improved two-dimensional model can determine the stress distribution of the adhesive with high accuracy. Finally, the effects of the thickness ratio, Young's modulus ratio, and interfacial compliance on the stress distribution of the adhesive are studied using the improved model.

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“…Subsequently, several researchers developed various more sophisticated, and more capable, theoretical models for evaluating the stresses in various joints. The works of Cornell (1953), Allman (1977), Delale et al (1981), Roberts (1989), Cheng et al (1991), Oplinger (1994), Taheri and Zou (2004), and Zou et al (2004) are representative of such works. On the other hand, the numerical models, including FEM and FDM, were also developed to handle the more complicated geometry and configurations, and also to validate the existence of stress concentration in the edges of the adhesive layer (Hart-Smith, 1973;Carpenter, 1973;Adams and Wake, 1984;Lin and Lin, 1993;Tsai and Morton, 1994;Bogdanovicha and Kizhakketharab, 1999;Andruet et al, 2001;Goncalves et al, 2002;Osnesa and Alfred, 2003).…”

Section: Introductionmentioning

confidence: 99%

A smart single-lap adhesive joint integrated with partially distributed piezoelectric patches

Cheng

Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2006

International Journal of Solids and Structures

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The powerful electro-mechanical coupling attribute of piezoelectric materials enables these materials to act as effective actuators. Using this attribute, a smart single-lap adhesive joint was developed by anti-symmetrically surface bonding piezoelectric patches onto a typical single-lap joint. The forces and bending moments at the edges of the developed smart joint can be adaptively controlled by adjusting the applied electric field in the piezoelectric patches, thus reducing the stress concentration in the joint edges. In order to further verify the effect of surface bonding of the piezoelectric patches, a first-order shear deformation theory based analytical model was developed to evaluate the stress distribution in the adhesive layer. It was established that the piezoelectric patched joint could significantly reduce the stress concentration in the joint edges. The influence of location and size of the piezoelectric patches was also investigated. Furthermore, the state-space method was used to obtain the analytical solution. A series of finite element analyses were also carried out to verify the integrity of the developed solution. Results from the computational analyses were in good agreement with those obtained from the proposed results, thus validating the solutions.

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Treatment of Unsymmetric Adhesively Bonded Composite Sandwich Panels-To-Flange Joints

Cited by 23 publications

References 27 publications

The strain energy release rates in adhesively bonded balanced and unbalanced specimens and lap joints

The strain energy release rates in adhesively bonded balanced and unbalanced specimens and lap joints

Two dimensional analysis for an adhesively bonded composite single-lap joint based on flexible interface theory

A smart single-lap adhesive joint integrated with partially distributed piezoelectric patches

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