Mode-l Fracture Behaviour of Adhesive Joints. Part I. Relationship Between Fracture Energy and Bond Thickness

Daghyani, Hamid Reza; Ye, Lin; Mai, Yiu‐Wing

doi:10.1080/00218469508009935

Cited by 52 publications

(12 citation statements)

References 19 publications

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“…Bascom et al [1975] and Bascom and Cottington [1976] discovered from the tapered double cantilever beam test that the strength of rubbermodified epoxy-bonded specimens increased with the decrease of the adhesive thickness. This behavior was subsequently confirmed by many researchers [Kin Loch and Shaw 1981;Daghyani et al 1995a;1995b;Ikeda et al 2000;Yan et al 2001;2002;Lee et al 2003; using the same adhesive material and similar specimens. Attempts were made to use plastic zone size and its shape ahead of the crack tip to qualitatively explain the adhesive thickness-dependent fracture toughness [Kin Loch and Shaw 1981].…”

Section: Introductionsupporting

confidence: 53%

Untitled

2009

J. Mech. Mater. Struct.

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See inside back cover or http://www.jomms.org for submission guidelines.Regular subscription rate: $600 a year (print and electronic); $460 a year (electronic only).Subscriptions, requests for back issues, and changes of address should be sent to contact@mathscipub.org or to Mathematical Sciences Publishers, 798 Evans Hall, Department of Mathematics, University of California, Berkeley, CA 94720-3840. His research interests were broad, and touched on many of the major themes in mechanics over the last 60 years: plate and shell theory, stability theory, vibrations of elastic bodies, wave propagation, and fracture mechanics. He remained active in research following his retirement from Stanford, and, in later years, developed an interest in the mechanics of solids as viewed from an Eshelbean standpoint. This he pursued vigorously with longtime collaborator Reinhold Kienzler up to his death in 2007. His work brought him wide recognition and a number of awards from various professional societies. Among these were election to the National Academy of Engineering, the Centennial Medal of the American Society of Mechanical Engineers, the von Karman medal of the American Society of Civil Engineers, and the Eringen medal of the Society of Engineering Science.His service to the mechanics community was equally important. He served on innumerable boards and committees, and was quite influential in the Applied Mechanics Division of the American Society of Mechanical Engineers. In an era in which important Soviet work in mechanics was largely unknown in the West, he began the English translation of Prikladnaya Matematika i Mekhanika, the premier Russian language mechanics journal and served for many years as its translation editor. Perhaps most significantly, he founded the International Journal of Solids and Structures in 1965 and served as its Editor until his retirement from Stanford, building it into one of the most reputable journals in the field.On a personal level, George Herrmann was a man of great warmth and charm. Those of us who were his students will recall his kindness and consideration, even on those occasions on which we tried his patience. Particularly impressive was his uncanny ability to find the best line of attack on a given research problem, where he was often able to obtain significant results with only a minimum of tools. His lectures were clear, focused, and well-organized, and his courses were always popular with the students. He was an accomplished linguist, and constantly amazed those of us around him by his ability to converse 629 630 TERRY J. DELPH AND DEWEY H. HODGES with the seminar speaker of the day in the speaker's native language. While at Stanford, he organized frequent outings, excursions, and dinners for the students and faculty that did much to build a strong sense of camaraderie within the Department, and later the Division, of Applied Mechanics.We think that we can speak for the contributors to this issue, and certainly for ourselves, in saying that it was a privilege to have known him.

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Section: Introductionsupporting

confidence: 53%

Untitled

2009

J. Mech. Mater. Struct.

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“…Bascom et al [1975] and Bascom and Cottington [1976] discovered from the tapered double cantilever beam test that the strength of rubbermodified epoxy-bonded specimens increased with the decrease of the adhesive thickness. This behavior was subsequently confirmed by many researchers [Kin Loch and Shaw 1981;Daghyani et al 1995a;1995b;Ikeda et al 2000;Yan et al 2001;2002;Lee et al 2003;2004] using the same adhesive material and similar specimens. Attempts were made to use plastic zone size and its shape ahead of the crack tip to qualitatively explain the adhesive thickness-dependent fracture toughness [Kin Loch and Shaw 1981].…”

Section: Introductionsupporting

confidence: 52%

Brittle fracture beyond the stress intensity factor

Sun¹,

Qian²

2009

J. Mech. Mater. Struct.

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It is commonly believed that the fracture toughness of a brittle material can be characterized by a single parameter such as the stress intensity factor. In this study, it was demonstrated that when the crack is highly constrained, the first nonsingular opening stress term at the crack tip, in addition to the Kfield (the singular stress term), is necessary to predict fracture. Fracture experiments were conducted using plexiglass specimens with a center crack. Relatively rigid metallic end tabs were used to generate boundary constraints on the specimen. The level of constraint was varied by varying the gage length between the end tabs. For a given crack length, the fracture load increases as the gage length decreases. If the stress intensity factor is used to determine the corresponding fracture toughness of plexiglass, the experimental data would indicate that the fracture toughness decreases as the gage length decreases. This is equivalent to saying that the fracture toughness of a brittle material can be affected by boundary conditions. It was shown that this behavior is the result of a diminishing size of the K -dominance zone and that the stress intensity factor alone cannot fully capture the fracture force. A new constant parameter was introduced to account for the effect of the near-tip nonsingular stress field on fracture.

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“…Many researches in this area have been previously carried out in order to explore the influence of the adhesive thickness on the cohesive parameters, of which the fracture energy has been focused on by most groups [6,9,[11][12][13][14][15][16][17]. Generally, as the adhesive thickness increases, the fracture energy (or critical energy release rate) increases to a peak value, and then either to keep stable [11,17], or gradually reduces to a plateau value corresponding to the bulk adhesive materials [9,15,16]. In contrast, the researches on the direct relationship between the separation strength and adhesive thickness are limited, which result from the following reason.…”

Section: Introductionmentioning

confidence: 99%

Influence of adhesive thickness on local interface fracture and overall strength of metallic adhesive bonding structures

Wei

2013

International Journal of Adhesion and Adhesives

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a b s t r a c tAdhesive bonding structures are widely used in a variety of engineering fields. Their overall strength is dependent on the cohesive properties involving local interface fracture. In the present research, the influence of the adhesive thickness on the cohesive properties and the overall strength of metallic adhesive bonding structures are investigated, with the cohesive zone model employed to equivalently simulate the adhesive layers with various thicknesses. A theoretical approach has been developed to determine the cohesive parameters for the present model when the adhesive thickness is varied. And then some numerical examples are given to explore the adhesive thickness-dependence overall strength of the adhesive joints, followed by some comparisons with the existing experimental results. Furthermore, the variations of both the cohesive parameters and the overall strength with the various thicknesses are influenced by some intrinsic characteristics of adhesives, which are investigated finally. The results show that both the cohesive parameters and the overall strength of metallic adhesive bonding structures are much dependent on the adhesive thickness, and the variations of overall strength resulting from the various thicknesses have discrepancy due to the toughness and strain hardening capacity of adhesives.Crown

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Mode-l Fracture Behaviour of Adhesive Joints. Part I. Relationship Between Fracture Energy and Bond Thickness

Cited by 52 publications

References 19 publications

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Brittle fracture beyond the stress intensity factor

Influence of adhesive thickness on local interface fracture and overall strength of metallic adhesive bonding structures

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