A modified degradation technique for fatigue life assessment of adhesive materials subjected to cyclic shear loads

Akhavan‐Safar, A.; Monteiro, Joaquim; Carbas, R.J.C.; Marques, E.A.S.; Goyal, Rakesh; Silva, Lucas F. M. da

doi:10.1177/0954406220967684

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…Although this standard treats the fracture energy in mode I (DCB specimens), it is usual to use a similar geometry for mode II, which facilitates the manufacturing process and the comparison of the obtained results. 30 To manufacture the joints, the substrates were initially sandblasted and then were cleaned with acetone. To guarantee the adhesive thickness in the joint, a calibrated metal strip with the thickness of the adhesive layer was placed at one end, and a double-beveled plate with the same thickness was placed on the other end.…”

Section: Joint Geometry and Manufacturingmentioning

confidence: 99%

Effect of creep on the mode II residual fracture energy of adhesives

Neto

Akhavan‐Safar

Sampaio

et al. 2021

J of Applied Polymer Sci

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Viscous flow that often occurs in adhesive materials leads to a permanent deformation when adhesives are subjected to creep loading. Creep loading has a significant influence on the strength of bonded structures. Due to the viscous behavior, the fracture energy also may change with time for joints that experience creep loading in service. In this work the effects of two creep parameters (creep load and time) on the residual mode II fracture energy of an adhesive was investigated using end notched flexure (ENF) specimens. To achieve this, ENF samples were subjected to different creep loading levels at different creep times followed by quasi static tests to obtain the residual shear fracture energy of the adhesive. Experimental results showed that pre-creep loading of the bonded structures can significantly improve the fracture energy and the static strength of the joints.

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Section: Joint Geometry and Manufacturingmentioning

confidence: 99%

Effect of creep on the mode II residual fracture energy of adhesives

Neto

Akhavan‐Safar

Sampaio

et al. 2021

J of Applied Polymer Sci

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“…Some authors have studied the effect of loading angle on the static and fatigue response of adhesive joints 27–29 . Sousa et al 29 studied the influence of different mode mixities on the fatigue life of an epoxy‐based adhesive.…”

Section: Introductionmentioning

confidence: 99%

The interaction of loading mode and humidity on the properties degradation of an epoxy adhesive subjected to strength, fracture, and fatigue tests

Lopes

Akhavan‐Safar

Carbas

et al. 2022

J of Applied Polymer Sci

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Hygrothermal aging has a significant impact on the performance of adhesives and bonded joints. However, despite extensive investigations into the aging effect of bonded structures, there is still limited knowledge on how aging affects joint performance as a function of the loading type and the load angle.Accordingly, in this study, an epoxy adhesive was tested under different loading types/angles including tensile and shear standard strength tests, mode I and mode II fracture tests, and fatigue and static Arcan tests. All these experiments were performed for both aged and unaged conditions. To understand the influence of loading angle on the failure response of aged bonded joints, Arcan samples were subjected to mixed mode loading conditions as well. A fractography analysis was conducted to provide a better understanding of the failure mechanism of aged samples loaded at different modes. Based on these results, it was found that mode I (tensile loading conditions) is more sensitive to the aging conditions than mode II (shearing) for all loading types (strength, fracture, and fatigue tests). The influence of moisture on fracture toughness was however less relevant than the strength. The results also showed that for the same loading mode and for the same Arcan joints, the fatigue strength is significantly more degraded by the aging conditions than the static strength.

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“…Factors such as the thickness of the bond line [21][22][23], the rate of loading [17,24], previous cyclic loading history [25], humidity [26], and temperature of the adhesive joint [27,28] can affect the response of the adhesive. These effects are particularly well documented for the critical energy release rate and plateau (or peak) traction [4].…”

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confidence: 99%

A novel cohesive zone modelling approach to represent mixed mode loading and bond line thickness effects

Watson

Worswick

Cronin

2023

The Journal of Adhesion

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Accurate representation of the traction-separation response for mixed mode loading in a cohesive zone model (CZM) is critical to predicting the response of adhesive joints in a number of applications, including transportation and vehicle crashworthiness. Traditionally, the Mode I and Mode II responses are treated independently, with mixed mode response determined by relationships between the degree of mode mixity and separation, potentially leading to overprediction of the plateau traction and underprediction of the plateau length in mixed mode loading. This poor fit is due to the indirect relationship between mixity and traction and having minimal fitting options for separation-to-plateau and softening. To address this limitation, a mixed mode CZM approach is proposed, based on measured mixedmode traction-separation results for a toughened epoxy adhesive. The effects of bond line thickness were considered, to examine the ability of the proposed approach to include additional effects (beyond mode mixity) that are known to affect the traction-separation response. The CZM implementation was assessed using the original test data and was shown to capture the measured experimental traction-separation response across a range of mixed mode loading and bond line thickness more accurately compared to traditional CZM treatments.

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A modified degradation technique for fatigue life assessment of adhesive materials subjected to cyclic shear loads

Cited by 8 publications

References 35 publications

Effect of creep on the mode II residual fracture energy of adhesives

Effect of creep on the mode II residual fracture energy of adhesives

The interaction of loading mode and humidity on the properties degradation of an epoxy adhesive subjected to strength, fracture, and fatigue tests

A novel cohesive zone modelling approach to represent mixed mode loading and bond line thickness effects

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