Study of Adherend Thickness Influence on the Bond Strength of Carbon/Epoxy Composite Joints

Liu, Li Hong; Zhang, Jian Guang; Wen, Yong Hai

doi:10.4028/www.scientific.net/amr.785-786.323

Cited by 1 publication

(3 citation statements)

References 8 publications

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“…This result could be associated with the double effect that an increase of substrate thickness has on the LSS. 17 The first is a positive effect: joints with thicker substrates have higher stiffness leading to lower stress concentration at the overlap ends. The second is a negative effect: joints with thicker substrates lead to larger eccentricity in the load path increasing the bending moment at the adhesive layer.…”

Section: Resultsmentioning

confidence: 99%

“…8 The efficiency of adhesive bonding can be influenced by several factors, among others adhesive type, 9,10 temperature, 11,12 stress concentrations, 13 overlap length, 14,15 joint width, 16 substrate material 8 and substrate thickness. 15,17 Some of the limitations of adhesive bonding which are associated with its polymeric nature, e.g. sensitivity to radiation and harsh environments, as well as durability against creep, can be addressed by hybrid joining, i.e.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of aluminium substrate thickness on the lap-shear strength of adhesively bonded and hybrid riveted-bonded joints

Beber

Wolter

Schneider

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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For lightweight materials, e.g. aluminium, the definition of proper joining technology relies on material properties, as well as design and manufacturing aspects. Substrate thickness is especially relevant due to its impact on the weight of components. The present work compares the performance of adhesively bonded (AJ) to hybrid riveted-bonded joints (HJ) using aluminium substrates. To assess the lightweight potential of these joining methods, the effect of substrate thickness (2 and 3 mm) on the lap-shear strength (LSS) of single lap joints is investigated. An epoxy-based structural adhesive is employed for bonding, whilst HJs are produced by lockbolt rivet insertion into fully cured adhesive joints. The stiffness of joints increased with an increase of substrate thickness. HJs presented two-staged failure process with an increase in energy absorption and displacement at break. For HJs, the substrate thickness changed the failure mechanism of rivets: with thicker substrates failure occurred due to shear, whereas in thinner substrates due to rivet pulling-through. The LSS of 2 mm and 3 mm-thick AJs is similar. With 2 mm-thick substrates, the LSS of HJs was lower than AJs. In contrast, the highest LSS is obtained by the 3 mm-thick HJs. The highest lightweight potential, i.e. LSS divided by weight, is achieved by the 2 mm-thick AJs, followed by the 3 mm-thick HJs with a loss of ca. 10% of specific LSS.

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Section: Resultsmentioning

confidence: 99%