Evaluating the Rate-Dependent Fracture Toughness of an Automotive Adhesive

Pohlit, David J.; Dillard, David A.; Jacob, George; Starbuck, J. Michael

doi:10.1080/00218460801952825

Cited by 26 publications

(14 citation statements)

References 13 publications

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“…The significant stress whitening that occurred at the tip of each arrest and re-initiation event left an easily observable record of the fracture propagation, correlating with stress-whitening observations obtained when conducting fracture tests of the neat adhesive [57]. These crack fronts were slightly curved resulting in classic thumbnail profiles.…”

Section: Test Proceduresmentioning

confidence: 74%

“…The adhesive used, PL731SI, was a commercially available, two-part epoxy system produced by Sovereign Specialty Adhesives Inc. (Chicago, IL, USA). The time and temperature dependence of this epoxy has been reported elsewhere [57]. In preparation for bonding, the adherends were cleaned with a repeated abrading procedure using ScotchBrite 4 pads and acetone, after which the adherends were air-dried prior to bonding.…”

Section: Materials and Specimen Preparationmentioning

confidence: 99%

“…The curing procedure used was based on discussions with the manufacturer. Using this technique, neat adhesive plaques were also prepared with thicknesses of 8 and 27 mm to be used in the machining of compact tension specimens characterized in a parallel study [57]. Following curing, the panels were air cooled until reaching room temperature.…”

Section: Materials and Specimen Preparationmentioning

confidence: 99%

See 2 more Smart Citations

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

Dillard

Pohlit

Jacob

et al. 2011

The Journal of Adhesion

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A driven wedge test is used to characterize the mode I fracture resistance of adhesively bonded composite beam specimens over a range of crosshead rates up to 1 m=s. The shorter moment arms (between wedge contact and crack tip) significantly reduce inertial effects and stored energy in the debonded adherends, when compared with conventional means of testing double cantilever beam (DCB) specimens. This permitted collecting an order of magnitude more crack initiation events per specimen than could be obtained with end-loaded DCB specimens bonded with an epoxy exhibiting significant stick-slip behavior. The localized contact of the wedge with the adherends limits the amount of both elastic and kinetic energy, significantly reduces crack advance during slip events, and facilitates higher resolution imaging of the fracture zone with high speed imaging. The method appears to work well under both quasi-static and high rate loading, consistently providing substantially more discrete fracture events for specimens exhibiting pronounced stick-slip failures. Deflections associated with beam transverse shear and root rotation for the shorter beams were not negligible, so simple beam theory was inadequate for obtaining qualitative fracture energies. Finite element analysis of the specimens, however, showed that fracture energies were in good agreement with values obtained from traditional DCB tests. The method holds promise for use in dynamic testing and for characterizing bonded or laminated materials exhibiting significant stick slip behavior, reducing the number of specimens required to characterize a sufficient number of fracture events.

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Section: Test Proceduresmentioning

confidence: 74%

Section: Materials and Specimen Preparationmentioning

confidence: 99%

Section: Materials and Specimen Preparationmentioning

confidence: 99%

See 1 more Smart Citation

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

Dillard

Pohlit

Jacob

et al. 2011

The Journal of Adhesion

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“…Increasingly, there is a need to characterise the performance of adhesively bonded joints at higher test rates [3,4]. This stems from the increased use of adhesives in automotive structural applications which may be subject to road shocks and impact damage during vehicle collision.…”

Section: Introductionmentioning

confidence: 99%

The fracture behaviour of structural adhesives under high rates of testing

Blackman

Kinloch

Sánchez

et al. 2009

Engineering Fracture Mechanics

117

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“…More recently, it has been increasingly used in demanding structural applications including aircraft, automobiles, and construction. The automotive industry, in particular, is paying considerable attention to using adhesive bonding to join primary structural components [2]. This trend has been driven by the extensive use of lightweight materials such as aluminium or fibre reinforced polymers (FRP) in combination with conventional steel in a quest to improve fuel consumption.…”

Section: Introductionmentioning

confidence: 99%