Interface corner stress states: plasticity effects

Reedy, E.D.; Guess, T.R.

doi:10.1007/bf00039575

Cited by 23 publications

(12 citation statements)

References 14 publications

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“…Epoxy yielding is rate-and temperature-dependent and is thought to be a manifestation of stress-dependent, nonlinear viscoelastic material response. 14) for a rigid-perfectly plastic adhesive predicts a hydrostatic interfacial tension of 1.5 (Jy [58]. This constitutive model must be valid at the extremely high strain and hydrostatic tension levels generated in the region of an interface comer.…”

Section: Small-scale Yieldingmentioning

confidence: 99%

“…Most of this work has concentrated on determining the strength of the stress singularity [73][74][75][76][77][78], although there have been several studies where the associated stress-intensity factor has also been determined for a limited range of loadings [58,79,80]. Attempts to extend an interface-comer-type analysis to ductile materials are still in their initial phase.…”

Section: Large-scale Yieldingmentioning

confidence: 99%

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Strength of butt and sharp-cornered joints

Reedy¹,

David²

2002

Adhesion Science and Engineering

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Section: Small-scale Yieldingmentioning

confidence: 99%

Section: Large-scale Yieldingmentioning

confidence: 99%

Strength of butt and sharp-cornered joints

Reedy¹,

David²

2002

Adhesion Science and Engineering

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“…non-linear deformation or failure process zone) must be confined to a small singularity region at the interface corner: condition referred to as small scale yielding theory in LEFM. There are already some experimental evidences, which emphasized that H c and λ parameters can be effectively used to successfully predict the onset of failure and eventually evaluate the relationship between bond thickness and adherend stiffness, and the strength of certain adhesively-bonded butt and scarf joints [4,18,19].…”

Section: H C Parametermentioning

confidence: 99%

Strength prediction and reliability of brittle epoxy adhesively bonded dissimilar joint

Afendi

Majid

Daud

et al. 2013

International Journal of Adhesion and Adhesives

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This paper deals with strength and failure prediction as well as reliability issues of adhesive joints of brittle epoxy bonding two dissimilar adherends. Effects of bond thickness and scarf angle upon the strength of such joints are also addressed. Three kinds of adhesive joints, i.e., butt, scarf and shear joints are considered. It is found that the strength prediction of various adhesive joints under consideration can be done by establishing interface corner toughness, H c parameter. For adhesive joints with an interfacial crack, fracture toughness, J c or interfacial toughness, K c can be used as a fracture criterion depends on the fracture type observed. The predicted strengths based on these fracture criteria (i.e. H c , J c and K c) are in good agreement with experimental data obtained. Weibull modulus is a suitable parameter to define the strength reliability of adhesive joints. From experimental data, scarf joint of 45° is identified to be preferable since it satisfies both outstanding load-bearing performance and tolerable reliability. In addition, Weibull statistical method has made possible the strength reliability determination of non-cracked adhesive joints.

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“…More recently, Reedy has composed a significant body of work applying the stress singularity approach to an adhesively bonded butt joint geometry [53,54,[58][59][60][61][62][63][64][65][66]. This work included testing a significant number of both aluminum and steel adherends bonded together by an unfilled epoxy adhesive.…”

Section: Interfacial Stress Singularity Mechanicsmentioning

confidence: 99%

Studies on the disbonding initiation of interfacial cracks.

McAdams

Pearson

2005

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With the continuing trend of decreasing feature sizes in flip-chip assemblies, the reliability tolerance to interfacial flaws is also decreasing. Small-scale disbonds will become more of a concern, pointing to the need for a better understanding of the initiation stage of interfacial delamination. With most accepted adhesion metric methodologies tailored to predict failure under the prior existence of a disbond, the study of the initiation phenomenon is open to development and standardization of new testing procedures. Traditional fracture mechanics approaches are not suitable, as the mathematics assume failure to originate at a disbond or crack tip. Disbond initiation is believed to first occur at free edges and corners, which act as high stress concentration sites and exhibit singular stresses similar to a crack tip, though less severe in intensity. As such, a "fracture mechanics-like" approach may be employed which defines a material parameter-a critical stress intensity factor (K C)-that can be used to predict when initiation of a disbond at an interface will occur.

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Interface corner stress states: plasticity effects

Cited by 23 publications

References 14 publications

Strength of butt and sharp-cornered joints

Strength of butt and sharp-cornered joints

Strength prediction and reliability of brittle epoxy adhesively bonded dissimilar joint

Studies on the disbonding initiation of interfacial cracks.

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