The effects of test temperature and humidity on the mixed-mode fatigue behavior of a toughened adhesive aluminum joint

Datla, Naresh V.; Papini, M.; Ulicny, John C.; Carlson, Blair E.; Spelt, J.K.

doi:10.1016/j.engfracmech.2011.01.028

Cited by 46 publications

(28 citation statements)

References 29 publications

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“…This significant effect of the presence of liquid water at the crack tip on crack path has also been previously noted for adhesive joints loaded in mixed-mode fatigue, where it was accompanied by a significant decrease in G th [22]. This was attributed to moisture diffusion ahead of the crack tip being faster than the crack growth rate near the threshold, thus hydrating the aluminum oxide and weakening the interface, causing interfacial failure [22].…”

Section: Effect Of Environment On the P2-etched Aa6061-t6 Systemmentioning

confidence: 67%

“…A previous study on mixed-mode fatigue with the same adhesive demonstrated that the crack path became progressively closer to the more highly-strained adherend as the applied G, and hence the crack growth rate, decreased to the threshold [7][12] [22]. This shift in the crack path was explained using finite element modeling as being due to a decrease in the crack-tip plastic zone size [22].…”

Section: Fatiguementioning

confidence: 99%

“…This shift in the crack path was explained using finite element modeling as being due to a decrease in the crack-tip plastic zone size [22]. It was hypothesized that the distance between the crack tip and the more highlystrained adherend was controlled by the size of the plastic zone, so that it became smallest at the fatigue threshold.…”

Section: Fatiguementioning

confidence: 99%

“…RH and 40ºC-100% RH (condensing humidity) [22]. To measure crack growth, the DCB specimens were taken out of the environment chamber for approximately 1 min.…”

Section: Fixed-displacement Creep Crack Growth Testsmentioning

confidence: 99%

“…In all cases, interfacial failure in fatigue near the threshold caused by the small plastic zone, became cohesive when subsequently fractured using quasi-static loading, because the much greater applied G produced a much larger plastic zone, as explained in refs. [7], [12], [22]. Even when the specimens remained cohesive but near-interfacial in fatigue near the threshold (e.g.…”

Section: Fatiguementioning

confidence: 99%

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Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Jhin¹,

Azari²,

Ameli³

et al. 2013

International Journal of Adhesion and Adhesives

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The relationship between crack path and test method was examined by comparing the performance of adhesive-adherend combinations (six) in quasi-static fracture, mixed-mode fatigue, and creep crack growth. Crack paths in creep and quasi-static fracture were similar due to similar crack-tip plastic zone sizes in the epoxy adhesive even though the crack growth rates in creep were much smaller. Under condensed moisture and mixed-mode, creep and threshold fatigue tests produced interfacial failure. Under room-temperature dry environment, near threshold mixed-mode fatigue was interfacial, but was not in creep or quasi-static fracture.Smaller plastic zone size and crack path proximity to the interface that followed increased the sensitivity of near threshold, mixed-mode fatigue to surface properties. Therefore, the interfacial or cohesive failure of an adhesive system, which may judge the quality of the bond, can be a function of the test being conducted and may not be an absolute indicator of joint quality.iii Acknowledgements I would like to thank Professor Spelt and Professor Papini for their undivided attention to the progress of my research from my just starting learning about the theoretical and practical aspects of adhesive joints until the submission of my first journal paper. Without their direction and contribution, this thesis and its paper counter-part could not have reached the level of caliber and attention to detail that it has reached now. Although they probably deserve more than a brief mention, I would also like to thank all my previous and current lab mates who have been such a great help explaining to me all the theoretical and practical aspects of fracture mechanics, and how can I forget the innumerable hours spent on discussing research, science, politics and life in general. They are, without the order of importance: Siva Prasad Varma Nadimpalli, Naresh

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Section: Effect Of Environment On the P2-etched Aa6061-t6 Systemmentioning

confidence: 67%

Section: Fatiguementioning

confidence: 99%

Section: Fatiguementioning

confidence: 99%

“…RH and 40ºC-100% RH (condensing humidity) [22]. To measure crack growth, the DCB specimens were taken out of the environment chamber for approximately 1 min.…”

Section: Fixed-displacement Creep Crack Growth Testsmentioning

confidence: 99%

Section: Fatiguementioning

confidence: 99%

See 3 more Smart Citations

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Jhin¹,

Azari²,

Ameli³

et al. 2013

International Journal of Adhesion and Adhesives

Self Cite

View full text Add to dashboard Cite

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Mechanical properties of foam sandwich with chopped‐glass‐fiber/carbon nanotube reinforced hierarchical structure interlayer

Chen

Jiang

et al. 2020

Polymer Composites

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A chopped‐glass fiber/multi‐walled carbon nanotubes (MWCNTs) hierarchical reinforcing structure was used to toughen the core‐face interlayer of sandwich materials. Chopped‐fiber mats modified by MWCNTs‐COOH were inserted at the face‐core interface before resin infusion. Sandwich beams were prepared by vacuum‐assisted resin transfer molding, containing a Polyvinylchloride (PVC) foam core covered with two glass fiber/epoxy composite face sheets. The mechanical properties were characterized using quasi‐static three‐point‐bending, Charpy impact, and asymmetric double cantilever beam. Improvement in mechanical properties and interlayer toughness was achieved in the sandwich structure with negligible weight increase and processing variations. The interfacial characteristics between chopped glass fibers, carbon nanotubes, and underlying energy absorption mechanisms were discussed and analyzed using scanning electron microscopy.

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Fatigue Load Conditions

Ashcroft¹

2017

Handbook of Adhesion Technology

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The effects of test temperature and humidity on the mixed-mode fatigue behavior of a toughened adhesive aluminum joint

Cited by 46 publications

References 29 publications

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Crack growth rate and crack path in adhesively bonded joints: Comparison of creep, fatigue and fracture

Mechanical properties of foam sandwich with chopped‐glass‐fiber/carbon nanotube reinforced hierarchical structure interlayer

Fatigue Load Conditions

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