An analysis of the crack tip stress field in DCB adhesive fracture specimens

Wang, S. S.; Mandell, John F.; McGarry, Frederick J.

doi:10.1007/bf00032383

Cited by 133 publications

(59 citation statements)

References 8 publications

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“…Now, there are several reasons why the SERR, G, approach, and not the stress-intensity factor approach, has invariably been used when employing a fracture-mechanics approach to investigate the failure of polymeric-matrix fibre-composite materials and adhesively-bonded joints, see for example [5,7,8,[22][23][24][25][26][27][28]. There is the difficulty of calculating the stressintensity factor around the crack tip in anisotropic and inhomogeneous materials and bonded joints.…”

Section: Introductionmentioning

confidence: 99%

Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

Jones

Kinloch

2016

International Journal of Fatigue

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Section: Introductionmentioning

confidence: 99%

Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

Jones

Kinloch

2016

International Journal of Fatigue

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“…The other half of the explanation was offered by Wang (89), who suggested that a second effect was also present. A stress analysis by Wang et al (90) showed that the crack-tip stress field in the adhesive bond differs from that in bulk specimens in that the tensile stresses some distance ahead of the crack tip are higher than expected. As the bond thickness is decreased, this effect becomes more pronounced.…”

Section: Fracture Mechanism: Fracture Behavior In Thin Layersmentioning

confidence: 99%

Mechanisms of Toughening Thermoset Resins

Huang

Hunston

Kinloch

et al. 1993

Advances in Chemistry

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“…This result raises questions concerning the applicability of linear elastic fracture mechanics to joints of the type tested. It has been previously reported by Wang et al [13] that the region dominated by the elastic crack-tip singularity in an adhesive layer can be quite small, and the characteristic length scale is associated with the adhesive layer thickness, not crack length. Linear elastic results for the joint analyzed here suggest a similar conclusion.…”

Section: Results For a Cracked Elastic-plastic Adhesivementioning

confidence: 99%

Composite-to-metal tubular lap joints: strength and fatigue resistance

Reedy

Guess

1993

Int J Fract

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The axial strength and fatigue resistance of thick-walled, adhesively bonded E-glass composite-to-aluminum tubular lap joints have been measured for tensile and compressive loadings. The joint specimen bonds a 63 mm OD aluminium tube within each end of a 300mm long, 6mm thick E-glass/epoxy tube. Untapered, 12.5mm thick aluminium adherends were used in all but four of the joint specimens. The aluminum adherends in the remaining four specimens were tapered to a thickness of 1 mm at the inner bond end (the bond end where the aluminum adherend terminates). For all loadings, joint failure initiates at the inner bond end as a crack grows in the adhesive adjacent to the interface. Test results for a tension-tension fatigue loading indicate that fatigue can severely degrade joint performance. Interestingly, measured tensile strength and fatigue resistance for joints with untapered adherends is substantially greater than compressive strength and fatigue resistance.The joint specimen has been analyzed in two different ways: one approach models the adhesive as an uncracked, elastic-perfectly plastic material, while the other approach uses a linear elastic fracture mechanics methodology. Results for the uncracked, elastic-plastic adhesive model indicate that observed bond failure occurs in the region of highest calculated stresses, extensive bond yielding occurs at load levels well below that required to fail the joint, and a tensile peel stress is generated by a compressive joint loading when the aluminum adherends are untapered. This latter result is consistent with the observed joint tensile-compressive strength differential. Results of the linear elastic fracture mechanics analysis of a joint with untapered aluminum adherends are also consistent with the observed differential strength effect since a mode I crack loading is predicted for a compressive joint loading. Calculations and a limited number of tests suggest that it may be possible to selectively control the differential strength effect by tapering the aluminum adherends. The effect of adherend material and thickness on fracture mechanics parameters is also investigated. The paper concludes by examining the applicability of linear elastic fracture mechanics to the joints tested.

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An analysis of the crack tip stress field in DCB adhesive fracture specimens

Cited by 133 publications

References 8 publications

Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

Mechanisms of Toughening Thermoset Resins

Composite-to-metal tubular lap joints: strength and fatigue resistance

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