Observations of Decreased Fracture Toughness for Mixed Mode Fracture Testing of Adhesively Bonded Joints

Dillard, David A.; Singh, Hitendra K.; Pohlit, David J.; Starbuck, J. Michael

doi:10.1163/156856109x452701

Cited by 50 publications

(23 citation statements)

References 48 publications

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“…It has been widely documented that the toughness of adhesive joints and composite laminates can vary considerably depending on the mode of loading [1,2,3,4]. In many of these cases, the mode I energy release rate (ERR), G IC , is shown to be the most critical, and hence is a conservative value when used in design.…”

Section: Introductionmentioning

confidence: 99%

“…In many of these cases, the mode I energy release rate (ERR), G IC , is shown to be the most critical, and hence is a conservative value when used in design. However, Dillard et al [3] highlighted a number of cases where the lowest measured ERR, G C , occurs at a certain mixed mode I/II loading. To eliminate the risk of non-conservative design, and also avoid over design, it is important to characterise joint toughness over a full range of mixed mode loadings ranging from pure mode I (tensile) to pure mode II (in-plane shear).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mixed mode partitioning of beam-like geometries: A damage dependent solution

Conroy

Kinloch

Williams

et al. 2015

Engineering Fracture Mechanics

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mixed mode partitioning of beam-like geometries: A damage dependent solution

Conroy

Kinloch

Williams

et al. 2015

Engineering Fracture Mechanics

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“…The asymmetry of the beams gives a constant mixity defined by the relation between the thicknesses of the two adherends. This test has been used by several researchers [2][3][4][5] although there is some reserve about its applicability due to the little amount of mode II.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness of a structural adhesive under mixed mode loadings

Silva¹,

Esteves

Chaves

2011

Materialwissenschaft Werkst

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This aim of this research was to determine the fracture toughness of steel/adhesive/steel joints under mixed mode loadings. A structural and ductile epoxy adhesive was selected in this research. The experimental tests, i. e. Asymmetric Tapered Double Cantilever Beam (ATDCB), Single Leg Bending (SLB) and Asymmetric Double Cantilever Beam (ADCB), were realized to assess the fracture toughness in mixed mode. Experimental tests in pure mode I and II were also realized to complete the fracture envelope. In order to obtain the mode I critical energy release rates, G Ic , the standard Double Cantilever Beam test was used, whilst the critical strain energy release rate in mode II, G IIc , was evaluated with the End Notched Flexure test. For various mixed mode tests, the critical strain energy release rate values were partitioned into mode I and mode II components. One of the main conclusions of the present work is that the introduction of a small amount of mode II loading (shear) in the joint results in a decrease of the total fracture energy, G T = G I + G II , when compared to the pure mode I fracture energy.

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“…It is important to note that the crack propagation direction was found to be towards the interface as can be seen in the appearance of the failed specimen shown in Figure 11. This type of crack growth has been commonly found in adhesive joints under a shear-dominant loading mode [14]. The propagation direction is often normal to the angle of the maximum mode I strain energy release rate because the mode I fracture energy of an adhesive is generally much lower than that for mode II.…”

Section: Resultsmentioning

confidence: 89%