Mixed Experimental‐Structural Model for Interlaminar Shear Fracture Toughness

Bachrach, William E.; Hicks, T. R.; Habas, Zbigniew S.; Granata, Dianne M.

doi:10.1061/(asce)0893-1321(1991)4:1(108)

Cited by 6 publications

(12 citation statements)

References 4 publications

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“…The LEFM based method showed that measurement of the Mode II toughness G IIC is sensitive to the crack length and delamination front profile (Schuecker and Davidson 2000). It was also reported that with the LEFM, a single fracture test may not be truly representative of a consistent G IIC , and a series of tests with different initial crack lengths are required (Bachrach et al 1991). The effects of friction on the Mode-II specimen (shear test) have been speculated to be a possible reason for this poor reproducibility.…”

Section: Introductionmentioning

confidence: 97%

Effects of bondline thickness on Mode-II interfacial laws of bonded laminated composite plate

Ouyang

2010

Int J Fract

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For a variety of modern industries, interfacial delamination is a critical issue for the design and application of laminated composite structures. Numerous global experimental studies have been conducted to characterize the toughness of adhesively bonded composite structures. In the recent two decades, cohesive zone models (CZMs) have been receiving intensive attentions. The local interfacial traction-separation laws as the fundamental input are crucial for the successful applications of CZMs. Several local tests have also been conducted to determine the interfacial traction-separation laws in adhesively bonded joints. However, very few tests have been employed to investigate the dependency of the local interfacial traction-separation laws on the bondline thickness, particularly, for the laminated composite joints under Mode-II loading conditions. In this work, the effects of bondline thickness on the interfacial behavior have been systematically investigated at various typical bondline thicknesses (from 0.1 to 0.8 mm). The effects of adhesive thickness on the interfacial toughness, interfacial strength, and shapes of the local interfacial traction-separation laws have also been evaluated. The test results indicated that the measured Mode-II (shear test) interfacial

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Section: Introductionmentioning

confidence: 97%

Effects of bondline thickness on Mode-II interfacial laws of bonded laminated composite plate

Ouyang

2010

Int J Fract

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“…With this model, the scatter and inconsistency in Mode II toughness may be significantly reduced. And the strong dependency of the Mode II fracture toughness on the initial crack length as reported by the previous study (Bachrach et al, 1991) may be explained in a new perspective. Some important issues will be highlighted for the modeling and design of pure interface shear fracture.…”

Section: Introductionmentioning

confidence: 86%

“…4 (Bachrach et al, 1991) were 25.4 mm and 101.6 mm, respectively. A typical Poisson's ratio t = 0.39 of the carbon fiber reinforced composite laminate is assumed in the current study.…”

Section: Experimental Verificationsmentioning

confidence: 96%

“…In order to verify the present model, a comprehensive comparison with the test results reported by Bachrach et al (1991) is conducted. However, the detailed cohesive laws are not available for the specimens in their experiment.…”

Section: Experimental Verificationsmentioning

confidence: 98%

“…The critical interlaminar fracture toughness is computed using the linear elastic fracture mechanics (LEFM) combined with data reduction techniques. The LEFM based measurement of Mode II toughness G IIc showed that the critical load is sensitive to the crack length and delamination front profile in previous experimental studies (Bachrach et al, 1991;Schuecker and Davidson, 2000). Therefore, one test of the critical load may not be truly representative of a consistent G IIc , and a number of tests are required.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear interface shear fracture of end notched flexure specimens

Ouyang¹,

Li²

2009

International Journal of Solids and Structures

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a b s t r a c tThe nonlinear analytical solutions of an end notched flexure adhesive joint or fracture test specimen with identical or dissimilar adherends are investigated. In the current study, a cohesive zone model (with arbitrary nonlinear cohesive laws) based analytical solution is obtained for the interface shear fracture of an end notched flexure (ENF) specimen with sufficiently long bond length. It is found that the scatter and inconsistency in calculating Mode II toughness may be significantly reduced by this model. The present work indicates that the Mode II toughness G IIc under pure shear cracking condition is indeed very weakly dependent on the initial crack length. And this conclusion is well supported by the experimental results found in the literature. The parametric studies show that the interface shear strength is the most dominant parameter on the critical load. It is also interesting to note that with very short initial crack length and identical interface shear strength, higher Mode II toughness indeed cannot increase the critical load. Unlike the high insensitivity of critical load to the detailed shape of the cohesive law for Mode I peel fracture, the shape of the cohesive law becomes relatively important for the critical load of joints under pure Mode II fracture conditions, especially for joints with short initial crack length. The current study may help researchers deepen the understanding of interface shear fracture and clarify some previous concepts on this fracture mode.

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Local Interface Shear Fracture of Bonded Steel Joints with Various Bondline Thicknesses

Ouyang

2011

Exp Mech

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Mixed Experimental‐Structural Model for Interlaminar Shear Fracture Toughness

Cited by 6 publications

References 4 publications

Effects of bondline thickness on Mode-II interfacial laws of bonded laminated composite plate

Effects of bondline thickness on Mode-II interfacial laws of bonded laminated composite plate

Nonlinear interface shear fracture of end notched flexure specimens

Local Interface Shear Fracture of Bonded Steel Joints with Various Bondline Thicknesses

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